- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- /*
- * $Id: FuncId.java,v 1.14 2004/02/17 04:34:01 minchau Exp $
- */
- package com.sun.org.apache.xpath.internal.functions;
-
- import java.util.StringTokenizer;
-
- import com.sun.org.apache.xml.internal.dtm.DTM;
- import com.sun.org.apache.xml.internal.dtm.DTMIterator;
- import com.sun.org.apache.xml.internal.utils.StringVector;
- import com.sun.org.apache.xpath.internal.NodeSetDTM;
- import com.sun.org.apache.xpath.internal.XPathContext;
- import com.sun.org.apache.xpath.internal.objects.XNodeSet;
- import com.sun.org.apache.xpath.internal.objects.XObject;
- import com.sun.org.apache.xpath.internal.res.XPATHErrorResources;
-
- /**
- * Execute the Id() function.
- * @xsl.usage advanced
- */
- public class FuncId extends FunctionOneArg
- {
-
- /**
- * Fill in a list with nodes that match a space delimited list if ID
- * ID references.
- *
- * @param xctxt The runtime XPath context.
- * @param docContext The document where the nodes are being looked for.
- * @param refval A space delimited list of ID references.
- * @param usedrefs List of references for which nodes were found.
- * @param nodeSet Node set where the nodes will be added to.
- * @param mayBeMore true if there is another set of nodes to be looked for.
- *
- * @return The usedrefs value.
- */
- private StringVector getNodesByID(XPathContext xctxt, int docContext,
- String refval, StringVector usedrefs,
- NodeSetDTM nodeSet, boolean mayBeMore)
- {
-
- if (null != refval)
- {
- String ref = null;
- // DOMHelper dh = xctxt.getDOMHelper();
- StringTokenizer tokenizer = new StringTokenizer(refval);
- boolean hasMore = tokenizer.hasMoreTokens();
- DTM dtm = xctxt.getDTM(docContext);
-
- while (hasMore)
- {
- ref = tokenizer.nextToken();
- hasMore = tokenizer.hasMoreTokens();
-
- if ((null != usedrefs) && usedrefs.contains(ref))
- {
- ref = null;
-
- continue;
- }
-
- int node = dtm.getElementById(ref);
-
- if (DTM.NULL != node)
- nodeSet.addNodeInDocOrder(node, xctxt);
-
- if ((null != ref) && (hasMore || mayBeMore))
- {
- if (null == usedrefs)
- usedrefs = new StringVector();
-
- usedrefs.addElement(ref);
- }
- }
- }
-
- return usedrefs;
- }
-
- /**
- * Execute the function. The function must return
- * a valid object.
- * @param xctxt The current execution context.
- * @return A valid XObject.
- *
- * @throws javax.xml.transform.TransformerException
- */
- public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
- {
-
- int context = xctxt.getCurrentNode();
- DTM dtm = xctxt.getDTM(context);
- int docContext = dtm.getDocument();
-
- if (DTM.NULL == docContext)
- error(xctxt, XPATHErrorResources.ER_CONTEXT_HAS_NO_OWNERDOC, null);
-
- XObject arg = m_arg0.execute(xctxt);
- int argType = arg.getType();
- XNodeSet nodes = new XNodeSet(xctxt.getDTMManager());
- NodeSetDTM nodeSet = nodes.mutableNodeset();
-
- if (XObject.CLASS_NODESET == argType)
- {
- DTMIterator ni = arg.iter();
- StringVector usedrefs = null;
- int pos = ni.nextNode();
-
- while (DTM.NULL != pos)
- {
- DTM ndtm = ni.getDTM(pos);
- String refval = ndtm.getStringValue(pos).toString();
-
- pos = ni.nextNode();
- usedrefs = getNodesByID(xctxt, docContext, refval, usedrefs, nodeSet,
- DTM.NULL != pos);
- }
- // ni.detach();
- }
- else if (XObject.CLASS_NULL == argType)
- {
- return nodes;
- }
- else
- {
- String refval = arg.str();
-
- getNodesByID(xctxt, docContext, refval, null, nodeSet, false);
- }
-
- return nodes;
- }
- }