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76 lines
3.0 KiB
76 lines
3.0 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 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: VariableSafeAbsRef.java,v 1.2.4.1 2005/09/14 21:31:45 jeffsuttor Exp $
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*/
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package com.sun.org.apache.xpath.internal.operations;
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import com.sun.org.apache.xml.internal.dtm.DTMManager;
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import com.sun.org.apache.xpath.internal.Expression;
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import com.sun.org.apache.xpath.internal.XPathContext;
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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.XObject;
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/**
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* This is a "smart" variable reference that is used in situations where
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* an absolute path is optimized into a variable reference, but may
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* be used in some situations where the document context may have changed.
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* For instance, in select="document(doc/@href)//name[//salary > 7250]", the
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* root in the predicate will be different for each node in the set. While
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* this is easy to detect statically in this case, in other cases static
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* detection would be very hard or impossible. So, this class does a dynamic check
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* to make sure the document context of the referenced variable is the same as
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* the current document context, and, if it is not, execute the referenced variable's
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* expression with the current context instead.
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*/
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public class VariableSafeAbsRef extends Variable
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{
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static final long serialVersionUID = -9174661990819967452L;
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/**
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* Dereference the variable, and return the reference value. Note that lazy
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* evaluation will occur. If a variable within scope is not found, a warning
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* will be sent to the error listener, and an empty nodeset will be returned.
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*
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*
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* @param xctxt The runtime execution context.
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*
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* @return The evaluated variable, or an empty nodeset if not found.
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*
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* @throws javax.xml.transform.TransformerException
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*/
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public XObject execute(XPathContext xctxt, boolean destructiveOK)
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throws javax.xml.transform.TransformerException
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{
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XNodeSet xns = (XNodeSet)super.execute(xctxt, destructiveOK);
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DTMManager dtmMgr = xctxt.getDTMManager();
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int context = xctxt.getContextNode();
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if(dtmMgr.getDTM(xns.getRoot()).getDocument() !=
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dtmMgr.getDTM(context).getDocument())
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{
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Expression expr = (Expression)xns.getContainedIter();
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xns = (XNodeSet)expr.asIterator(xctxt, context);
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}
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return xns;
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}
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}
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