/*
* eXist Open Source Native XML Database
* Copyright (C) 2008-2009 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.memtree.DocumentBuilderReceiver;
import org.exist.memtree.MemTreeBuilder;
import org.exist.xquery.AnalyzeContextInfo;
import org.exist.xquery.Dependency;
import org.exist.xquery.PathExpr;
import org.exist.xquery.Profiler;
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.SequenceIterator;
import org.exist.xquery.value.Type;
import org.exist.xslt.XSLContext;
import org.exist.xslt.pattern.Pattern;
import org.w3c.dom.Attr;
import org.xml.sax.SAXException;
/**
* <!-- Category: instruction -->
* <xsl:value-of
* select? = expression
* separator? = { string }
* [disable-output-escaping]? = "yes" | "no">
* <!-- Content: sequence-constructor -->
* </xsl:value-of>
*
* @author <a href="mailto:shabanovd@gmail.com">Dmitriy Shabanov</a>
*
*/
public class ValueOf extends SimpleConstructor {
private String attr_select = null;
private PathExpr select = null;
private String separator = null;
private Boolean disable_output_escaping = null;
protected boolean sequenceItSelf = false;
public ValueOf(XSLContext context) {
super(context);
}
public void setToDefaults() {
select = null;
//the default separator is a single space (#x20) when the content is specified using the select attribute,
//or a zero-length string when the content is specified using a sequence constructor.
separator = null;
disable_output_escaping = null;
}
public void prepareAttribute(ContextAtExist context, Attr attr) throws XPathException {
String attr_name = attr.getNodeName();
if (attr_name.equals(SELECT)) {
attr_select = attr.getValue();
} else if (attr_name.equals(SEPARATOR)) {
separator = attr.getValue();
} else if (attr_name.equals(DISABLE_OUTPUT_ESCAPING)) {
disable_output_escaping = getBoolean(attr.getValue());
}
}
public void analyze(AnalyzeContextInfo contextInfo) throws XPathException {
boolean atRootCall = false;//XXX: rewrite
if (attr_select != null) {
select = new PathExpr(getContext());
Pattern.parse(getContext(), attr_select, select);
//UNDERSTAND: <node>text<node> step = "." -> SELF:node(), but need CHILD:node()
if ((contextInfo.getFlags() & DOT_TEST) != 0) {
atRootCall = true;
_check_(select);
contextInfo.removeFlag(DOT_TEST);
}
_check_childNodes_(select);
}
super.analyze(contextInfo);
if (atRootCall)
contextInfo.addFlag(DOT_TEST);
}
// protected void _check_(Expression path) {
// for (int pos = 0; pos < path.getLength(); pos++) {
// Expression expr = path.getExpression(pos);
// if (expr instanceof RootNode) {
// expr = new LocationStep(getContext(), Constants.CHILD_AXIS, new AnyNodeTest());
// path.replaceExpression(pos, expr);
// continue;
// }
// if ((pos == 0) && (expr instanceof LocationStep)) {
// LocationStep location = (LocationStep) expr;
// if (location.getAxis() == Constants.SELF_AXIS) {
// location.setAxis(Constants.CHILD_AXIS);
// }
// } else {
// _check_(expr);
// }
// }
// if (path.getLength() != 0) {
// Expression expr = path.getExpression(path.getLength()-1);
// if (expr instanceof LocationStep) {
// LocationStep location = (LocationStep) expr;
// //TODO: rewrite
// if (!"node()".equals(location.getTest().toString())) {
// ((PathExpr)path).add(new LocationStep(getContext(), Constants.CHILD_AXIS, new AnyNodeTest()));
// }
// }
// }
// }
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 (contextItem != null) {
// contextSequence = contextItem.toSequence();
// }
// evaluate the expression
context.pushDocumentContext();
Sequence result;
try {
// System.out.println("=================================================================");
// System.out.println("select = "+select);
// System.out.println("contextSequence = "+contextSequence);
// System.out.println("contextItem = "+contextItem);
result = select.eval(contextSequence, contextItem);
if (sequenceItSelf)
return result;
} finally {
context.popDocumentContext();
}
// create the output
MemTreeBuilder builder = context.getDocumentBuilder();
DocumentBuilderReceiver receiver = new DocumentBuilderReceiver(builder);
try {
SequenceIterator i = result.iterate();
Item next = i.nextItem();
StringBuffer buf = null;
boolean allowAttribs = true;
while (next != null) {
context.proceed(this, builder);
// if item is an atomic value, collect the string values of all
// following atomic values and seperate them by a space.
if (Type.subTypeOf(next.getType(), Type.ATOMIC)) {
if(buf == null)
buf = new StringBuffer();
else if (buf.length() > 0)
buf.append(' ');
buf.append(next.getStringValue());
allowAttribs = false;
next = i.nextItem(); // if item is a node, flush any collected character data and
// copy the node to the target doc.
} else if (Type.subTypeOf(next.getType(), Type.NODE)) {
if (buf != null && buf.length() > 0) {
receiver.characters(buf);
buf.setLength(0);
}
if (next.getType() == Type.ATTRIBUTE && !allowAttribs)
throw new XPathException(this, "XQTY0024: An attribute may not appear after " +
"another child node.");
next.copyTo(context.getBroker(), receiver);
allowAttribs = next.getType() == Type.ATTRIBUTE;
next = i.nextItem();
}
}
// flush remaining character data
if (buf != null && buf.length() > 0)
receiver.characters(buf);
} catch (SAXException e) {
LOG.warn("SAXException during serialization: " + e.getMessage(), e);
throw new XPathException(this, e.getMessage());
//throw new XPathException(getASTNode(),
// "Encountered SAX exception while serializing enclosed expression: "
// + ExpressionDumper.dump(this));
}
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("<xsl:value-of");
if (select != null) {
dumper.display(" select = ");
select.dump(dumper);
}
if (separator != null)
dumper.display(" separator = "+separator);
if (disable_output_escaping != null)
dumper.display(" disable-output-escaping = "+disable_output_escaping);
dumper.display("> ");
super.dump(dumper);
dumper.display("</xsl:value-of>");
}
public String toString() {
StringBuffer result = new StringBuffer();
result.append("<xsl:value-of");
if (select != null)
result.append(" select = "+select.toString());
if (separator != null)
result.append(" separator = "+separator.toString());
if (disable_output_escaping != null)
result.append(" disable-output-escaping = "+disable_output_escaping);
result.append("> ");
result.append(super.toString());
result.append("</xsl:value-of>");
return result.toString();
}
}