/*
* 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.DocumentImpl;
import org.exist.memtree.MemTreeBuilder;
import org.exist.util.XMLChar;
import org.exist.xquery.util.ExpressionDumper;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceIterator;
import org.exist.xquery.value.Type;
/**
* Dynamic constructor for processing instruction nodes.
*
* @author wolf
*/
public class DynamicPIConstructor extends NodeConstructor {
private Expression name;
private Expression content;
/**
* @param context
*/
public DynamicPIConstructor(XQueryContext context) {
super(context);
}
public void setNameExpr(Expression nameExpr) {
this.name = new Atomize(context, nameExpr);
}
public void setContentExpr(Expression contentExpr) {
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);
name.analyze(contextInfo);
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();
try {
MemTreeBuilder builder = context.getDocumentBuilder();
context.proceed(this, builder);
Sequence nameSeq = name.eval(contextSequence, contextItem);
//TODO : get rid of getLength()
if(!nameSeq.hasOne())
throw new XPathException(this, "The name expression should evaluate to a single value");
Item nameItem = nameSeq.itemAt(0);
if(!(nameItem.getType() == Type.STRING || nameItem.getType() == Type.NCNAME ||
nameItem.getType() == Type.UNTYPED_ATOMIC))
throw new XPathException(this, "The name expression should evaluate to a " +
Type.getTypeName(Type.STRING) + " or a " + Type.getTypeName(Type.NCNAME) +
" or a " + Type.getTypeName(Type.UNTYPED_ATOMIC) + ". Got: " +
Type.getTypeName(nameItem.getType()));
if(!XMLChar.isValidNCName(nameSeq.getStringValue()))
throw new XPathException(this, "XQDY0041 '" + nameSeq.getStringValue() + "' is not a valid processing instruction name");
if (nameSeq.getStringValue().equalsIgnoreCase("XML"))
throw new XPathException(this, "XQDY0064 '" + nameSeq.getStringValue() + "' is not a valid processing instruction name");
String contentString;
Sequence contentSeq = content.eval(contextSequence, contextItem);
if(contentSeq.isEmpty())
contentString = "";
else {
StringBuilder buf = new StringBuilder();
for(SequenceIterator i = contentSeq.iterate(); i.hasNext(); ) {
context.proceed(this, builder);
Item next = i.nextItem();
if(buf.length() > 0)
buf.append(' ');
buf.append(next.getStringValue());
}
while (buf.length() > 0 && Character.isWhitespace(buf.charAt(0)))
buf.deleteCharAt(0);
contentString = buf.toString();
}
if (contentString.indexOf("?>") != Constants.STRING_NOT_FOUND)
throw new XPathException(this, "XQDY0026 '" + contentString + "' is not a valid processing intruction content");
int nodeNr = builder.processingInstruction(nameSeq.getStringValue(), contentString);
Sequence result = ((DocumentImpl)builder.getDocument()).getNode(nodeNr);
if (context.getProfiler().isEnabled())
context.getProfiler().end(this, "", result);
return result;
} finally {
if (newDocumentContext)
context.popDocumentContext();
}
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#dump(org.exist.xquery.util.ExpressionDumper)
*/
public void dump(ExpressionDumper dumper) {
dumper.display("processing-instruction {");
name.dump(dumper);
dumper.display("} {");
dumper.startIndent();
content.dump(dumper);
dumper.endIndent().nl().display("}");
}
public String toString() {
StringBuilder result = new StringBuilder();
result.append("processing-instruction {");
result.append(name.toString());
result.append("} {");
result.append(content.toString());
result.append("} ");
return result.toString();
}
public void resetState(boolean postOptimization) {
super.resetState(postOptimization);
name.resetState(postOptimization);
content.resetState(postOptimization);
}
}