/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-04 Wolfgang M. Meier
* wolfgang@exist-db.org
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package org.exist.xquery;
import org.exist.memtree.MemTreeBuilder;
import org.exist.xquery.util.ExpressionDumper;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceIterator;
/**
* Implements a dynamic comment constructor. Contrary to {@link org.exist.xquery.CommentConstructor},
* the character content of a DynamicCommentConstructor is determined only at evaluation time.
*
* @author wolf
*/
public class DynamicCommentConstructor extends NodeConstructor {
final private Expression content;
/**
* @param context
*/
public DynamicCommentConstructor(XQueryContext context, Expression contentExpr) {
super(context);
this.content = new Atomize(context, contentExpr);
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#analyze(org.exist.xquery.AnalyzeContextInfo)
*/
public void analyze(AnalyzeContextInfo contextInfo) throws XPathException {
super.analyze(contextInfo);
contextInfo.setParent(this);
content.analyze(contextInfo);
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#eval(org.exist.xquery.value.Sequence, org.exist.xquery.value.Item)
*/
public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
if (context.getProfiler().isEnabled()) {
context.getProfiler().start(this);
context.getProfiler().message(this, Profiler.DEPENDENCIES,
"DEPENDENCIES", Dependency.getDependenciesName(this.getDependencies()));
if (contextSequence != null)
{context.getProfiler().message(this, Profiler.START_SEQUENCES,
"CONTEXT SEQUENCE", contextSequence);}
if (contextItem != null)
{context.getProfiler().message(this, Profiler.START_SEQUENCES,
"CONTEXT ITEM", contextItem.toSequence());}
}
if (newDocumentContext)
{context.pushDocumentContext();}
Sequence result;
try {
final Sequence contentSeq = content.eval(contextSequence, contextItem);
if (contentSeq.isEmpty())
{result = Sequence.EMPTY_SEQUENCE;}
else {
final MemTreeBuilder builder = context.getDocumentBuilder();
context.proceed(this, builder);
final StringBuilder buf = new StringBuilder();
for(final SequenceIterator i = contentSeq.iterate(); i.hasNext(); ) {
context.proceed(this, builder);
final Item next = i.nextItem();
if(buf.length() > 0)
{buf.append(' ');}
buf.append(next.toString());
}
if (buf.indexOf("--") != Constants.STRING_NOT_FOUND ||
buf.toString().endsWith("-")) {
throw new XPathException(this, ErrorCodes.XQDY0072,
"'" + buf.toString() + "' is not a valid comment");
}
final int nodeNr = builder.comment(buf.toString());
result = builder.getDocument().getNode(nodeNr);
}
} finally {
if (newDocumentContext)
{context.popDocumentContext();}
}
if (context.getProfiler().isEnabled())
{context.getProfiler().end(this, "", result);}
return result;
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#dump(org.exist.xquery.util.ExpressionDumper)
*/
public void dump(ExpressionDumper dumper) {
dumper.display("comment {");
dumper.startIndent();
content.dump(dumper);
dumper.endIndent();
dumper.nl().display("}");
}
public String toString() {
final StringBuilder result = new StringBuilder();
result.append("comment {");
result.append(content.toString());
result.append("} ");
return result.toString();
}
public void resetState(boolean postOptimization) {
super.resetState(postOptimization);
content.resetState(postOptimization);
}
}