/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-06 Wolfgang M. Meier
* wolfgang@exist-db.org
* http://exist.sourceforge.net
*
* 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.dom.DocumentSet;
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;
import org.exist.xquery.value.ValueSequence;
/**
* @author wolf
*/
public class Atomize extends AbstractExpression {
private final Expression expression;
public Atomize(XQueryContext context, Expression expr) {
super(context);
this.expression = expr;
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#analyze(org.exist.xquery.Expression)
*/
public void analyze(AnalyzeContextInfo contextInfo) throws XPathException {
contextInfo.setParent(this);
expression.analyze(contextInfo);
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#eval(org.exist.xquery.StaticContext, org.exist.dom.DocumentSet, 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());}
}
final Sequence result = atomize(expression.eval(contextSequence, contextItem));
if (context.getProfiler().isEnabled())
{context.getProfiler().end(this, "", result);}
return result;
}
public static Sequence atomize(Sequence input) throws XPathException {
if (input.isEmpty())
{return Sequence.EMPTY_SEQUENCE;}
if (input.hasOne())
{return input.itemAt(0).atomize();}
Item next;
final ValueSequence result = new ValueSequence();
for(final SequenceIterator i = input.iterate(); i.hasNext(); ) {
next = i.nextItem();
result.add(next.atomize());
}
return result;
}
public Expression getExpression() {
return expression;
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#dump(org.exist.xquery.util.ExpressionDumper)
*/
public void dump(ExpressionDumper dumper) {
if(dumper.verbosity() > 1)
{dumper.display("atomize[");}
expression.dump(dumper);
if(dumper.verbosity() > 1)
{dumper.display("]");}
}
public void accept(ExpressionVisitor visitor) {
expression.accept(visitor);
}
public String toString() {
return expression.toString();
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#returnsType()
*/
public int returnsType() {
return Type.ATOMIC;
}
/* (non-Javadoc)
* @see org.exist.xquery.AbstractExpression#getDependencies()
*/
public int getDependencies() {
return expression.getDependencies();
}
public void setContextDocSet(DocumentSet contextSet) {
super.setContextDocSet(contextSet);
expression.setContextDocSet(contextSet);
}
/* (non-Javadoc)
* @see org.exist.xquery.AbstractExpression#resetState()
*/
public void resetState(boolean postOptimization) {
super.resetState(postOptimization);
expression.resetState(postOptimization);
}
public int getLine() {
return expression.getLine();
}
public int getColumn() {
return expression.getColumn();
}
public int getSubExpressionCount() {
return 1;
}
public Expression getSubExpression(int index) {
if (index == 0) {return expression;}
throw new IndexOutOfBoundsException("Index: "+index+", Size: "+getSubExpressionCount());
}
}