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614 lines
23 KiB
614 lines
23 KiB
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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*/
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/*
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* Copyright 1999-2004 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* $Id: ExsltDynamic.java,v 1.1.2.1 2005/08/01 02:08:51 jeffsuttor Exp $
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*/
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package com.sun.org.apache.xalan.internal.lib;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.transform.TransformerException;
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import com.sun.org.apache.xalan.internal.extensions.ExpressionContext;
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import com.sun.org.apache.xalan.internal.res.XSLMessages;
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import com.sun.org.apache.xalan.internal.res.XSLTErrorResources;
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import com.sun.org.apache.xpath.internal.NodeSet;
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import com.sun.org.apache.xpath.internal.NodeSetDTM;
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import com.sun.org.apache.xpath.internal.XPath;
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import com.sun.org.apache.xpath.internal.XPathContext;
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import com.sun.org.apache.xpath.internal.objects.XBoolean;
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import com.sun.org.apache.xpath.internal.objects.XNodeSet;
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import com.sun.org.apache.xpath.internal.objects.XNumber;
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import com.sun.org.apache.xpath.internal.objects.XObject;
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import jdk.xml.internal.JdkXmlUtils;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import org.w3c.dom.Text;
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import org.xml.sax.SAXNotSupportedException;
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/**
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* This class contains EXSLT dynamic extension functions.
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*
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* It is accessed by specifying a namespace URI as follows:
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* <pre>
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* xmlns:dyn="http://exslt.org/dynamic"
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* </pre>
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* The documentation for each function has been copied from the relevant
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* EXSLT Implementer page.
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*
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* @see <a href="http://www.exslt.org/">EXSLT</a>
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* @xsl.usage general
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*/
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public class ExsltDynamic extends ExsltBase
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{
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public static final String EXSL_URI = "http://exslt.org/common";
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/**
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* The dyn:max function calculates the maximum value for the nodes passed as
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* the first argument, where the value of each node is calculated dynamically
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* using an XPath expression passed as a string as the second argument.
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* <p>
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* The expressions are evaluated relative to the nodes passed as the first argument.
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* In other words, the value for each node is calculated by evaluating the XPath
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* expression with all context information being the same as that for the call to
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* the dyn:max function itself, except for the following:
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* <p>
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* <ul>
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* <li>the context node is the node whose value is being calculated.</li>
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* <li>the context position is the position of the node within the node set passed as
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* the first argument to the dyn:max function, arranged in document order.</li>
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* <li>the context size is the number of nodes passed as the first argument to the
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* dyn:max function.</li>
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* </ul>
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* <p>
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* The dyn:max function returns the maximum of these values, calculated in exactly
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* the same way as for math:max.
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* <p>
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* If the expression string passed as the second argument is an invalid XPath
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* expression (including an empty string), this function returns NaN.
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* <p>
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* This function must take a second argument. To calculate the maximum of a set of
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* nodes based on their string values, you should use the math:max function.
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*
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* @param myContext The ExpressionContext passed by the extension processor
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* @param nl The node set
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* @param expr The expression string
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*
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* @return The maximum evaluation value
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*/
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public static double max(ExpressionContext myContext, NodeList nl, String expr)
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throws SAXNotSupportedException
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{
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XPathContext xctxt = null;
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if (myContext instanceof XPathContext.XPathExpressionContext)
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xctxt = ((XPathContext.XPathExpressionContext) myContext).getXPathContext();
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else
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throw new SAXNotSupportedException(XSLMessages.createMessage(XSLTErrorResources.ER_INVALID_CONTEXT_PASSED, new Object[]{myContext }));
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if (expr == null || expr.length() == 0)
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return Double.NaN;
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NodeSetDTM contextNodes = new NodeSetDTM(nl, xctxt);
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xctxt.pushContextNodeList(contextNodes);
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double maxValue = - Double.MAX_VALUE;
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for (int i = 0; i < contextNodes.getLength(); i++)
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{
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int contextNode = contextNodes.item(i);
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xctxt.pushCurrentNode(contextNode);
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double result = 0;
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try
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{
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XPath dynamicXPath = new XPath(expr, xctxt.getSAXLocator(),
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xctxt.getNamespaceContext(),
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XPath.SELECT);
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result = dynamicXPath.execute(xctxt, contextNode, xctxt.getNamespaceContext()).num();
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}
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catch (TransformerException e)
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{
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xctxt.popCurrentNode();
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xctxt.popContextNodeList();
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return Double.NaN;
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}
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xctxt.popCurrentNode();
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if (result > maxValue)
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maxValue = result;
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}
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xctxt.popContextNodeList();
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return maxValue;
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}
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/**
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* The dyn:min function calculates the minimum value for the nodes passed as the
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* first argument, where the value of each node is calculated dynamically using
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* an XPath expression passed as a string as the second argument.
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* <p>
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* The expressions are evaluated relative to the nodes passed as the first argument.
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* In other words, the value for each node is calculated by evaluating the XPath
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* expression with all context information being the same as that for the call to
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* the dyn:min function itself, except for the following:
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* <p>
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* <ul>
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* <li>the context node is the node whose value is being calculated.</li>
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* <li>the context position is the position of the node within the node set passed
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* as the first argument to the dyn:min function, arranged in document order.</li>
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* <li>the context size is the number of nodes passed as the first argument to the
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* dyn:min function.</li>
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* </ul>
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* <p>
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* The dyn:min function returns the minimum of these values, calculated in exactly
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* the same way as for math:min.
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* <p>
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* If the expression string passed as the second argument is an invalid XPath expression
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* (including an empty string), this function returns NaN.
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* <p>
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* This function must take a second argument. To calculate the minimum of a set of
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* nodes based on their string values, you should use the math:min function.
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*
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* @param myContext The ExpressionContext passed by the extension processor
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* @param nl The node set
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* @param expr The expression string
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*
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* @return The minimum evaluation value
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*/
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public static double min(ExpressionContext myContext, NodeList nl, String expr)
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throws SAXNotSupportedException
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{
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XPathContext xctxt = null;
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if (myContext instanceof XPathContext.XPathExpressionContext)
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xctxt = ((XPathContext.XPathExpressionContext) myContext).getXPathContext();
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else
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throw new SAXNotSupportedException(XSLMessages.createMessage(XSLTErrorResources.ER_INVALID_CONTEXT_PASSED, new Object[]{myContext }));
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if (expr == null || expr.length() == 0)
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return Double.NaN;
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NodeSetDTM contextNodes = new NodeSetDTM(nl, xctxt);
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xctxt.pushContextNodeList(contextNodes);
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double minValue = Double.MAX_VALUE;
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for (int i = 0; i < nl.getLength(); i++)
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{
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int contextNode = contextNodes.item(i);
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xctxt.pushCurrentNode(contextNode);
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double result = 0;
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try
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{
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XPath dynamicXPath = new XPath(expr, xctxt.getSAXLocator(),
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xctxt.getNamespaceContext(),
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XPath.SELECT);
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result = dynamicXPath.execute(xctxt, contextNode, xctxt.getNamespaceContext()).num();
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}
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catch (TransformerException e)
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{
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xctxt.popCurrentNode();
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xctxt.popContextNodeList();
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return Double.NaN;
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}
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xctxt.popCurrentNode();
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if (result < minValue)
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minValue = result;
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}
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xctxt.popContextNodeList();
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return minValue;
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}
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/**
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* The dyn:sum function calculates the sum for the nodes passed as the first argument,
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* where the value of each node is calculated dynamically using an XPath expression
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* passed as a string as the second argument.
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* <p>
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* The expressions are evaluated relative to the nodes passed as the first argument.
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* In other words, the value for each node is calculated by evaluating the XPath
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* expression with all context information being the same as that for the call to
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* the dyn:sum function itself, except for the following:
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* <p>
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* <ul>
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* <li>the context node is the node whose value is being calculated.</li>
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* <li>the context position is the position of the node within the node set passed as
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* the first argument to the dyn:sum function, arranged in document order.</li>
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* <li>the context size is the number of nodes passed as the first argument to the
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* dyn:sum function.</li>
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* </ul>
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* <p>
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* The dyn:sum function returns the sumimum of these values, calculated in exactly
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* the same way as for sum.
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* <p>
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* If the expression string passed as the second argument is an invalid XPath
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* expression (including an empty string), this function returns NaN.
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* <p>
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* This function must take a second argument. To calculate the sumimum of a set of
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* nodes based on their string values, you should use the sum function.
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*
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* @param myContext The ExpressionContext passed by the extension processor
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* @param nl The node set
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* @param expr The expression string
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*
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* @return The sum of the evaluation value on each node
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*/
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public static double sum(ExpressionContext myContext, NodeList nl, String expr)
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throws SAXNotSupportedException
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{
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XPathContext xctxt = null;
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if (myContext instanceof XPathContext.XPathExpressionContext)
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xctxt = ((XPathContext.XPathExpressionContext) myContext).getXPathContext();
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else
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throw new SAXNotSupportedException(XSLMessages.createMessage(XSLTErrorResources.ER_INVALID_CONTEXT_PASSED, new Object[]{myContext }));
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if (expr == null || expr.length() == 0)
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return Double.NaN;
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NodeSetDTM contextNodes = new NodeSetDTM(nl, xctxt);
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xctxt.pushContextNodeList(contextNodes);
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double sum = 0;
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for (int i = 0; i < nl.getLength(); i++)
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{
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int contextNode = contextNodes.item(i);
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xctxt.pushCurrentNode(contextNode);
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double result = 0;
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try
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{
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XPath dynamicXPath = new XPath(expr, xctxt.getSAXLocator(),
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xctxt.getNamespaceContext(),
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XPath.SELECT);
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result = dynamicXPath.execute(xctxt, contextNode, xctxt.getNamespaceContext()).num();
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}
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catch (TransformerException e)
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{
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xctxt.popCurrentNode();
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xctxt.popContextNodeList();
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return Double.NaN;
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}
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xctxt.popCurrentNode();
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sum = sum + result;
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}
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xctxt.popContextNodeList();
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return sum;
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}
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/**
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* The dyn:map function evaluates the expression passed as the second argument for
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* each of the nodes passed as the first argument, and returns a node set of those values.
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* <p>
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* The expressions are evaluated relative to the nodes passed as the first argument.
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* In other words, the value for each node is calculated by evaluating the XPath
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* expression with all context information being the same as that for the call to
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* the dyn:map function itself, except for the following:
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* <p>
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* <ul>
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* <li>The context node is the node whose value is being calculated.</li>
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* <li>the context position is the position of the node within the node set passed
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* as the first argument to the dyn:map function, arranged in document order.</li>
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* <li>the context size is the number of nodes passed as the first argument to the
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* dyn:map function.</li>
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* </ul>
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* <p>
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* If the expression string passed as the second argument is an invalid XPath
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* expression (including an empty string), this function returns an empty node set.
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* <p>
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* If the XPath expression evaluates as a node set, the dyn:map function returns
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* the union of the node sets returned by evaluating the expression for each of the
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* nodes in the first argument. Note that this may mean that the node set resulting
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* from the call to the dyn:map function contains a different number of nodes from
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* the number in the node set passed as the first argument to the function.
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* <p>
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* If the XPath expression evaluates as a number, the dyn:map function returns a
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* node set containing one exsl:number element (namespace http://exslt.org/common)
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* for each node in the node set passed as the first argument to the dyn:map function,
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* in document order. The string value of each exsl:number element is the same as
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* the result of converting the number resulting from evaluating the expression to
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* a string as with the number function, with the exception that Infinity results
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* in an exsl:number holding the highest number the implementation can store, and
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* -Infinity results in an exsl:number holding the lowest number the implementation
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* can store.
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* <p>
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* If the XPath expression evaluates as a boolean, the dyn:map function returns a
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* node set containing one exsl:boolean element (namespace http://exslt.org/common)
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* for each node in the node set passed as the first argument to the dyn:map function,
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* in document order. The string value of each exsl:boolean element is 'true' if the
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* expression evaluates as true for the node, and '' if the expression evaluates as
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* false.
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* <p>
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* Otherwise, the dyn:map function returns a node set containing one exsl:string
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* element (namespace http://exslt.org/common) for each node in the node set passed
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* as the first argument to the dyn:map function, in document order. The string
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* value of each exsl:string element is the same as the result of converting the
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* result of evaluating the expression for the relevant node to a string as with
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* the string function.
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*
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* @param myContext The ExpressionContext passed by the extension processor
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* @param nl The node set
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* @param expr The expression string
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*
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* @return The node set after evaluation
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*/
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public static NodeList map(ExpressionContext myContext, NodeList nl, String expr)
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throws SAXNotSupportedException
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{
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XPathContext xctxt = null;
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Document lDoc = null;
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if (myContext instanceof XPathContext.XPathExpressionContext)
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xctxt = ((XPathContext.XPathExpressionContext) myContext).getXPathContext();
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else
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throw new SAXNotSupportedException(XSLMessages.createMessage(XSLTErrorResources.ER_INVALID_CONTEXT_PASSED, new Object[]{myContext }));
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if (expr == null || expr.length() == 0)
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return new NodeSet();
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NodeSetDTM contextNodes = new NodeSetDTM(nl, xctxt);
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xctxt.pushContextNodeList(contextNodes);
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NodeSet resultSet = new NodeSet();
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resultSet.setShouldCacheNodes(true);
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for (int i = 0; i < nl.getLength(); i++)
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{
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int contextNode = contextNodes.item(i);
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xctxt.pushCurrentNode(contextNode);
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XObject object = null;
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try
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{
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XPath dynamicXPath = new XPath(expr, xctxt.getSAXLocator(),
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xctxt.getNamespaceContext(),
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XPath.SELECT);
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object = dynamicXPath.execute(xctxt, contextNode, xctxt.getNamespaceContext());
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if (object instanceof XNodeSet)
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{
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NodeList nodelist = null;
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nodelist = ((XNodeSet)object).nodelist();
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for (int k = 0; k < nodelist.getLength(); k++)
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{
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Node n = nodelist.item(k);
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if (!resultSet.contains(n))
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resultSet.addNode(n);
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}
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}
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else
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{
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if (lDoc == null)
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{
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lDoc = JdkXmlUtils.getDOMDocument();
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}
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Element element = null;
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if (object instanceof XNumber)
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element = lDoc.createElementNS(EXSL_URI, "exsl:number");
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else if (object instanceof XBoolean)
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element = lDoc.createElementNS(EXSL_URI, "exsl:boolean");
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else
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element = lDoc.createElementNS(EXSL_URI, "exsl:string");
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Text textNode = lDoc.createTextNode(object.str());
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element.appendChild(textNode);
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resultSet.addNode(element);
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}
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}
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catch (Exception e)
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{
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xctxt.popCurrentNode();
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xctxt.popContextNodeList();
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return new NodeSet();
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}
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xctxt.popCurrentNode();
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}
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xctxt.popContextNodeList();
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return resultSet;
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}
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/**
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* The dyn:evaluate function evaluates a string as an XPath expression and returns
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* the resulting value, which might be a boolean, number, string, node set, result
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* tree fragment or external object. The sole argument is the string to be evaluated.
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* <p>
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* If the expression string passed as the second argument is an invalid XPath
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* expression (including an empty string), this function returns an empty node set.
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* <p>
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* You should only use this function if the expression must be constructed dynamically,
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* otherwise it is much more efficient to use the expression literally.
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*
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* @param myContext The ExpressionContext passed by the extension processor
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* @param xpathExpr The XPath expression string
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*
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* @return The evaluation result
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*/
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public static XObject evaluate(ExpressionContext myContext, String xpathExpr)
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throws SAXNotSupportedException
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{
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if (myContext instanceof XPathContext.XPathExpressionContext)
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{
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XPathContext xctxt = null;
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try
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{
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xctxt = ((XPathContext.XPathExpressionContext) myContext).getXPathContext();
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XPath dynamicXPath = new XPath(xpathExpr, xctxt.getSAXLocator(),
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xctxt.getNamespaceContext(),
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XPath.SELECT);
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return dynamicXPath.execute(xctxt, myContext.getContextNode(),
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xctxt.getNamespaceContext());
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}
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catch (TransformerException e)
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{
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return new XNodeSet(xctxt.getDTMManager());
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}
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}
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else
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throw new SAXNotSupportedException(XSLMessages.createMessage(XSLTErrorResources.ER_INVALID_CONTEXT_PASSED, new Object[]{myContext })); //"Invalid context passed to evaluate "
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}
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/**
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|
* The dyn:closure function creates a node set resulting from transitive closure of
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|
* evaluating the expression passed as the second argument on each of the nodes passed
|
|
* as the first argument, then on the node set resulting from that and so on until no
|
|
* more nodes are found. For example:
|
|
* <pre>
|
|
* dyn:closure(., '*')
|
|
* </pre>
|
|
* returns all the descendant elements of the node (its element children, their
|
|
* children, their children's children and so on).
|
|
* <p>
|
|
* The expression is thus evaluated several times, each with a different node set
|
|
* acting as the context of the expression. The first time the expression is
|
|
* evaluated, the context node set is the first argument passed to the dyn:closure
|
|
* function. In other words, the node set for each node is calculated by evaluating
|
|
* the XPath expression with all context information being the same as that for
|
|
* the call to the dyn:closure function itself, except for the following:
|
|
* <p>
|
|
* <ul>
|
|
* <li>the context node is the node whose value is being calculated.</li>
|
|
* <li>the context position is the position of the node within the node set passed
|
|
* as the first argument to the dyn:closure function, arranged in document order.</li>
|
|
* <li>the context size is the number of nodes passed as the first argument to the
|
|
* dyn:closure function.</li>
|
|
* <li>the current node is the node whose value is being calculated.</li>
|
|
* </ul>
|
|
* <p>
|
|
* The result for a particular iteration is the union of the node sets resulting
|
|
* from evaluting the expression for each of the nodes in the source node set for
|
|
* that iteration. This result is then used as the source node set for the next
|
|
* iteration, and so on. The result of the function as a whole is the union of
|
|
* the node sets generated by each iteration.
|
|
* <p>
|
|
* If the expression string passed as the second argument is an invalid XPath
|
|
* expression (including an empty string) or an expression that does not return a
|
|
* node set, this function returns an empty node set.
|
|
*
|
|
* @param myContext The ExpressionContext passed by the extension processor
|
|
* @param nl The node set
|
|
* @param expr The expression string
|
|
*
|
|
* @return The node set after evaluation
|
|
*/
|
|
public static NodeList closure(ExpressionContext myContext, NodeList nl, String expr)
|
|
throws SAXNotSupportedException
|
|
{
|
|
XPathContext xctxt = null;
|
|
if (myContext instanceof XPathContext.XPathExpressionContext)
|
|
xctxt = ((XPathContext.XPathExpressionContext) myContext).getXPathContext();
|
|
else
|
|
throw new SAXNotSupportedException(XSLMessages.createMessage(XSLTErrorResources.ER_INVALID_CONTEXT_PASSED, new Object[]{myContext }));
|
|
|
|
if (expr == null || expr.length() == 0)
|
|
return new NodeSet();
|
|
|
|
NodeSet closureSet = new NodeSet();
|
|
closureSet.setShouldCacheNodes(true);
|
|
|
|
NodeList iterationList = nl;
|
|
do
|
|
{
|
|
|
|
NodeSet iterationSet = new NodeSet();
|
|
|
|
NodeSetDTM contextNodes = new NodeSetDTM(iterationList, xctxt);
|
|
xctxt.pushContextNodeList(contextNodes);
|
|
|
|
for (int i = 0; i < iterationList.getLength(); i++)
|
|
{
|
|
int contextNode = contextNodes.item(i);
|
|
xctxt.pushCurrentNode(contextNode);
|
|
|
|
XObject object = null;
|
|
try
|
|
{
|
|
XPath dynamicXPath = new XPath(expr, xctxt.getSAXLocator(),
|
|
xctxt.getNamespaceContext(),
|
|
XPath.SELECT);
|
|
object = dynamicXPath.execute(xctxt, contextNode, xctxt.getNamespaceContext());
|
|
|
|
if (object instanceof XNodeSet)
|
|
{
|
|
NodeList nodelist = null;
|
|
nodelist = ((XNodeSet)object).nodelist();
|
|
|
|
for (int k = 0; k < nodelist.getLength(); k++)
|
|
{
|
|
Node n = nodelist.item(k);
|
|
if (!iterationSet.contains(n))
|
|
iterationSet.addNode(n);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
xctxt.popCurrentNode();
|
|
xctxt.popContextNodeList();
|
|
return new NodeSet();
|
|
}
|
|
}
|
|
catch (TransformerException e)
|
|
{
|
|
xctxt.popCurrentNode();
|
|
xctxt.popContextNodeList();
|
|
return new NodeSet();
|
|
}
|
|
|
|
xctxt.popCurrentNode();
|
|
|
|
}
|
|
|
|
xctxt.popContextNodeList();
|
|
|
|
iterationList = iterationSet;
|
|
|
|
for (int i = 0; i < iterationList.getLength(); i++)
|
|
{
|
|
Node n = iterationList.item(i);
|
|
if (!closureSet.contains(n))
|
|
closureSet.addNode(n);
|
|
}
|
|
|
|
} while(iterationList.getLength() > 0);
|
|
|
|
return closureSet;
|
|
|
|
}
|
|
|
|
}
|