/*
* 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.AnalyzeContextInfo;
import org.exist.xquery.XPathException;
import org.exist.xquery.util.ExpressionDumper;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.Type;
import org.exist.xquery.value.BooleanValue;
import org.exist.xslt.XSLContext;
import org.exist.xslt.pattern.Pattern;
import org.w3c.dom.Attr;
/**
* <!-- Category: instruction -->
* <xsl:when
* test = expression>
* <!-- Content: sequence-constructor -->
* </xsl:when>
*
* @author <a href="mailto:shabanovd@gmail.com">Dmitriy Shabanov</a>
*
*/
public class When extends SimpleConstructor {
private String attr_test = null;
private XSLPathExpr test = null;
public When(XSLContext context) {
super(context);
}
public void setToDefaults() {
test = null;
}
public void prepareAttribute(ContextAtExist context, Attr attr) throws XPathException {
String attr_name = attr.getNodeName();
if (attr_name.equals(TEST)) {
attr_test = attr.getValue();
}
}
public void analyze(AnalyzeContextInfo contextInfo) throws XPathException {
super.analyze(contextInfo);
if (attr_test != null) {
test = new XSLPathExpr(getXSLContext());
Pattern.parse(contextInfo.getContext(), attr_test, test);
_check_(test);
}
}
public Boolean test(Sequence contextSequence, Item contextItem) throws XPathException {
Sequence result = test.eval(contextSequence, contextItem);
if (result.getItemCount() == 0) //UNDERSTAND: is it correct
return false;
if (result.getItemCount() != 1)
throw new XPathException("problem at test");//UNDERSTAND: what to do?
return ((BooleanValue) result.itemAt(0).convertTo(Type.BOOLEAN)).getValue();
}
public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException {
return super.eval(contextSequence, contextItem);
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#dump(org.exist.xquery.util.ExpressionDumper)
*/
public void dump(ExpressionDumper dumper) {
dumper.display("<xsl:when");
if (test != null)
dumper.display(" test = "+test);
dumper.display("> ");
super.dump(dumper);
dumper.display("</xsl:when>");
}
public String toString() {
StringBuilder result = new StringBuilder();
result.append("<xsl:when");
if (test != null) {
result.append(" test = ");
result.append(test.toString());
}
result.append("> ");
result.append(super.toString());
result.append("</xsl:when>");
return result.toString();
}
}