/*
* eXist Open Source Native XML Database
* Copyright (C) 2008-2010 The eXist Project
* 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.xslt.expression;
import org.exist.interpreter.ContextAtExist;
import org.exist.xquery.AnyNodeTest;
import org.exist.xquery.Constants;
import org.exist.xquery.ErrorCodes.ErrorCode;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceIterator;
import org.exist.xquery.value.ValueSequence;
import org.exist.xquery.Dependency;
import org.exist.xquery.Expression;
import org.exist.xquery.LocationStep;
import org.exist.xquery.PathExpr;
import org.exist.xquery.Profiler;
import org.exist.xquery.XPathException;
import org.exist.xslt.XSLContext;
import org.exist.xslt.XSLExceptions;
import org.w3c.dom.Attr;
/**
* @author <a href="mailto:shabanovd@gmail.com">Dmitriy Shabanov</a>
*
*/
public class XSLPathExpr extends PathExpr implements XSLExpression {
public XSLPathExpr(XSLContext context) {
super(context);
setToDefaults();
}
public XSLContext getXSLContext() {
return (XSLContext) getContext();
}
public void validate() throws XPathException {
for (int pos = 0; pos < this.getLength(); pos++) {
Expression expr = this.getExpression(pos);
if (expr instanceof XSLPathExpr) {
XSLPathExpr xsl = (XSLPathExpr) expr;
xsl.validate();
}
}
}
/* (non-Javadoc)
* @see org.exist.xslt.instruct.Expression#compileError(java.lang.String)
*/
public void compileError(String code) throws XPathException {
throw new XPathException(code);
}
/* (non-Javadoc)
* @see org.exist.xslt.instruct.Expression#compileError(java.lang.String, java.lang.String)
*/
public void compileError(ErrorCode code, String description) throws XPathException {
throw new XPathException(this, code, description);
}
public Boolean getBoolean(String value) throws XPathException {
if (value.equals(YES))
return true;
else if (value.equals(NO))
return false;
compileError(XSLExceptions.ERR_XTSE0020);
return null;
}
protected void _check_(Expression path) {
for (int index = 0; index < path.getSubExpressionCount(); index++) {
Expression expr = path.getSubExpression(index);
if ((index == 0) && (expr instanceof LocationStep)) {
LocationStep location = (LocationStep) expr;
if (location.getTest().isWildcardTest())
;
else if (location.getAxis() == Constants.CHILD_AXIS) {
location.setAxis(Constants.SELF_AXIS);
}
} else {
_check_(expr);
}
}
}
protected void _check_childNodes_(Expression path) {
if (path.getSubExpressionCount() != 0) {
Expression expr = path.getSubExpression(path.getSubExpressionCount()-1);
if (expr instanceof LocationStep) {
LocationStep location = (LocationStep) expr;
//TODO: rewrite
if (location.getAxis() == Constants.ATTRIBUTE_AXIS)
;
else if (!"node()".equals(location.getTest().toString())) {
((PathExpr)path).add(new LocationStep(getContext(), Constants.CHILD_AXIS, new AnyNodeTest()));
} else {
location.setAxis(Constants.CHILD_AXIS);
}
}
}
}
protected void _check_(Expression path, boolean childNodes) {
_check_(path);
if (childNodes)
_check_childNodes_(path);
}
public void addText(String text) throws XPathException {
//UNDERSTAND: what is whitespace? text = StringValue.trimWhitespace(text);
Text constructor = new Text((XSLContext) getContext(), text);
add(constructor);
}
public void add(SimpleConstructor constructor) {
steps.add(constructor);
}
@Override
public void setToDefaults() {
// TODO Auto-generated method stub
}
@Override
public void prepareAttribute(ContextAtExist context, Attr attr) throws XPathException {
// TODO Auto-generated method stub
}
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());
}
Sequence result = null;
if (steps.size() == 0) {
result = Sequence.EMPTY_SEQUENCE;
} else {
result = new ValueSequence();
Sequence currentContext;
if (contextItem != null)
currentContext = contextItem.toSequence();
else
currentContext = contextSequence;
for (Expression expr : steps) {
if (currentContext == null) {
result.addAll(expr.eval(null, null));
continue;
}
//Restore a position which may have been modified by inner expressions
int p = context.getContextPosition();
Sequence seq = context.getContextSequence();
for (SequenceIterator iterInner = currentContext.iterate();
iterInner.hasNext(); p++) {
context.setContextSequencePosition(p, seq);
result.addAll(expr.eval(currentContext, iterInner.nextItem()));
}
}
}
if (context.getProfiler().isEnabled())
context.getProfiler().end(this, "", result);
return result;
}
/**
* @deprecated Use {@link #process(XSLContext,SequenceIterator)} instead
*/
public void process(SequenceIterator sequenceIterator, XSLContext context) {
process(context, sequenceIterator);
}
public void process(XSLContext context, SequenceIterator sequenceIterator) {
for (Expression step : steps) {
((XSLPathExpr) step).process(context, sequenceIterator);
}
}
}