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186 lines
7.8 KiB
186 lines
7.8 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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/*
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* Copyright 2002-2005 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: XPathExpressionImpl.java,v 1.2.4.1 2005/09/10 04:06:55 jeffsuttor Exp $
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*/
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package com.sun.org.apache.xpath.internal.domapi;
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import javax.xml.transform.TransformerException;
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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.XObject;
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import com.sun.org.apache.xpath.internal.res.XPATHErrorResources;
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import com.sun.org.apache.xpath.internal.res.XPATHMessages;
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import org.w3c.dom.DOMException;
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import org.w3c.dom.Document;
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import org.w3c.dom.Node;
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import org.w3c.dom.xpath.XPathException;
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import org.w3c.dom.xpath.XPathExpression;
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import org.w3c.dom.xpath.XPathNamespace;
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/**
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*
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* The class provides an implementation of XPathExpression according
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* to the DOM L3 XPath Specification, Working Group Note 26 February 2004.
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*
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* <p>See also the <a href='http://www.w3.org/TR/2004/NOTE-DOM-Level-3-XPath-20040226'>Document Object Model (DOM) Level 3 XPath Specification</a>.</p>
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*
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* <p>The <code>XPathExpression</code> interface represents a parsed and resolved
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* XPath expression.</p>
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*
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* @see org.w3c.dom.xpath.XPathExpression
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*
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* @xsl.usage internal
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*/
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class XPathExpressionImpl implements XPathExpression {
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/**
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* The xpath object that this expression wraps
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*/
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final private XPath m_xpath;
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/**
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* The document to be searched to parallel the case where the XPathEvaluator
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* is obtained by casting a Document.
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*/
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final private Document m_doc;
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/**
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* Constructor for XPathExpressionImpl.
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*
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* @param xpath The wrapped XPath object.
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* @param doc The document to be searched, to parallel the case where''
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* the XPathEvaluator is obtained by casting the document.
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*/
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XPathExpressionImpl(XPath xpath, Document doc) {
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m_xpath = xpath;
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m_doc = doc;
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}
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/**
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*
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* This method provides an implementation XPathResult.evaluate according
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* to the DOM L3 XPath Specification, Working Group Note 26 February 2004.
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*
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* <p>See also the <a href='http://www.w3.org/TR/2004/NOTE-DOM-Level-3-XPath-20040226'>Document Object Model (DOM) Level 3 XPath Specification</a>.</p>
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*
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* <p>Evaluates this XPath expression and returns a result.</p>
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* @param contextNode The <code>context</code> is context node for the
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* evaluation of this XPath expression.If the XPathEvaluator was
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* obtained by casting the <code>Document</code> then this must be
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* owned by the same document and must be a <code>Document</code>,
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* <code>Element</code>, <code>Attribute</code>, <code>Text</code>,
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* <code>CDATASection</code>, <code>Comment</code>,
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* <code>ProcessingInstruction</code>, or <code>XPathNamespace</code>
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* node.If the context node is a <code>Text</code> or a
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* <code>CDATASection</code>, then the context is interpreted as the
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* whole logical text node as seen by XPath, unless the node is empty
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* in which case it may not serve as the XPath context.
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* @param type If a specific <code>type</code> is specified, then the
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* result will be coerced to return the specified type relying on
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* XPath conversions and fail if the desired coercion is not possible.
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* This must be one of the type codes of <code>XPathResult</code>.
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* @param result The <code>result</code> specifies a specific result
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* object which may be reused and returned by this method. If this is
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* specified as <code>null</code>or the implementation does not reuse
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* the specified result, a new result object will be constructed and
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* returned.For XPath 1.0 results, this object will be of type
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* <code>XPathResult</code>.
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* @return The result of the evaluation of the XPath expression.For XPath
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* 1.0 results, this object will be of type <code>XPathResult</code>.
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* @exception XPathException
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* TYPE_ERR: Raised if the result cannot be converted to return the
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* specified type.
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* @exception DOMException
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* WRONG_DOCUMENT_ERR: The Node is from a document that is not supported
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* by the XPathEvaluator that created this
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* <code>XPathExpression</code>.
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* <br>NOT_SUPPORTED_ERR: The Node is not a type permitted as an XPath
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* context node.
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*
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* @see org.w3c.dom.xpath.XPathExpression#evaluate(Node, short, XPathResult)
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* @xsl.usage internal
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*/
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public Object evaluate(
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Node contextNode,
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short type,
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Object result)
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throws XPathException, DOMException {
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// If the XPathEvaluator was determined by "casting" the document
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if (m_doc != null) {
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// Check that the context node is owned by the same document
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if ((contextNode != m_doc) && (!contextNode.getOwnerDocument().equals(m_doc))) {
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String fmsg = XPATHMessages.createXPATHMessage(XPATHErrorResources.ER_WRONG_DOCUMENT, null);
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throw new DOMException(DOMException.WRONG_DOCUMENT_ERR, fmsg);
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}
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// Check that the context node is an acceptable node type
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short nodeType = contextNode.getNodeType();
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if ((nodeType != Document.DOCUMENT_NODE) &&
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(nodeType != Document.ELEMENT_NODE) &&
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(nodeType != Document.ATTRIBUTE_NODE) &&
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(nodeType != Document.TEXT_NODE) &&
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(nodeType != Document.CDATA_SECTION_NODE) &&
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(nodeType != Document.COMMENT_NODE) &&
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(nodeType != Document.PROCESSING_INSTRUCTION_NODE) &&
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(nodeType != XPathNamespace.XPATH_NAMESPACE_NODE)) {
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String fmsg = XPATHMessages.createXPATHMessage(XPATHErrorResources.ER_WRONG_NODETYPE, null);
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throw new DOMException(DOMException.NOT_SUPPORTED_ERR, fmsg);
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}
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}
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//
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// If the type is not a supported type, throw an exception and be
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// done with it!
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if (!XPathResultImpl.isValidType(type)) {
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String fmsg = XPATHMessages.createXPATHMessage(XPATHErrorResources.ER_INVALID_XPATH_TYPE, new Object[] {new Integer(type)});
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throw new XPathException(XPathException.TYPE_ERR,fmsg); // Invalid XPath type argument: {0}
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}
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// Cache xpath context?
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XPathContext xpathSupport = new XPathContext();
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// if m_document is not null, build the DTM from the document
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if (null != m_doc) {
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xpathSupport.getDTMHandleFromNode(m_doc);
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}
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XObject xobj = null;
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try {
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xobj = m_xpath.execute(xpathSupport, contextNode, null);
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} catch (TransformerException te) {
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// What should we do here?
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throw new XPathException(XPathException.INVALID_EXPRESSION_ERR,te.getMessageAndLocation());
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}
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// Create a new XPathResult object
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// Reuse result object passed in?
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// The constructor will check the compatibility of type and xobj and
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// throw an exception if they are not compatible.
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return new XPathResultImpl(type,xobj,contextNode, m_xpath);
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}
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}
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