/*
* 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.dom.QName;
import org.exist.interpreter.ContextAtExist;
import org.exist.memtree.MemTreeBuilder;
import org.exist.memtree.NodeImpl;
import org.exist.util.XMLChar;
import org.exist.xquery.AnalyzeContextInfo;
import org.exist.xquery.Atomize;
import org.exist.xquery.Dependency;
import org.exist.xquery.Expression;
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.QNameValue;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceIterator;
import org.exist.xquery.value.Type;
import org.exist.xslt.ErrorCodes;
import org.exist.xslt.XSLContext;
import org.exist.xslt.pattern.Pattern;
import org.w3c.dom.Attr;
import org.w3c.dom.DOMException;
/**
* <!-- Category: instruction -->
* <xsl:attribute
* name = { qname }
* namespace? = { uri-reference }
* select? = expression
* separator? = { string }
* type? = qname
* validation? = "strict" | "lax" | "preserve" | "strip">
* <!-- Content: sequence-constructor -->
* </xsl:attribute>
*
* @author <a href="mailto:shabanovd@gmail.com">Dmitriy Shabanov</a>
*
*/
public class Attribute extends SimpleConstructor {
private String name = null;
private String namespace = null;
private String select = null;
private String separator = null;
private String type = null;
private String validation = null;
private String value = null;
private XSLPathExpr qnameExpr = null;
private Expression valueExpr = null;
public Attribute(XSLContext context) {
super(context);
}
public Attribute(XSLContext context, String name) {
super(context);
this.name = name;
}
public Attribute(XSLContext context, String name, String value) {
super(context);
this.name = name;
this.value = value;
}
public void setValue(String value) {
this.value = value;
}
public void setToDefaults() {
name = null;
namespace = null;
select = null;
separator = null;
type = null;
validation = null;
}
public void prepareAttribute(ContextAtExist context, Attr attr) throws XPathException {
String attr_name = attr.getLocalName();
if (attr_name.equals(NAME)) {
name = attr.getValue();
} else if (attr_name.equals(NAMESPACE)) {
namespace = attr.getValue();
} else if (attr_name.equals(SELECT)) {
select = attr.getValue();
} else if (attr_name.equals(SEPARATOR)) {
separator = attr.getValue();
} else if (attr_name.equals(TYPE)) {
type = attr.getValue();
} else if (attr_name.equals(VALIDATION)) {
validation = attr.getValue();
}
}
public void validate() throws XPathException {
for (int pos = 0; pos < this.getLength(); pos++) {
Expression expr = this.getExpression(pos);
if (expr instanceof ValueOf) {
ValueOf valueOf = (ValueOf) expr;
valueOf.validate();
valueOf.sequenceItSelf = true;
} else if (expr instanceof ApplyTemplates) {
ApplyTemplates applyTemplates = (ApplyTemplates) expr;
applyTemplates.validate();
} else if (expr instanceof If) {
((If) expr).validate();
} else if (expr instanceof Text) {
Text text = (Text) expr;
text.validate();
text.sequenceItSelf = true;
} else {
compileError("Unsupported sub-element "+expr);
}
}
}
public void setContentExpr(Expression expr) {
this.valueExpr = new Atomize(context, expr);
}
public void analyze(AnalyzeContextInfo contextInfo) throws XPathException {
qnameExpr = Pattern.parse(contextInfo.getContext(), name);
if (qnameExpr != null)
qnameExpr.analyze(contextInfo);
valueExpr = Pattern.parse(contextInfo.getContext(), value);
if (valueExpr != null)
valueExpr.analyze(contextInfo);
else if (value == null){
contextInfo.addFlag(NON_STREAMABLE);
super.analyze(contextInfo);
}
}
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();
NodeImpl node;
try {
MemTreeBuilder builder = context.getDocumentBuilder();
builder.setReplaceAttributeFlag(true);
context.proceed(this, builder);
QName qn = null;
String name = null;
if (qnameExpr != null) {
Sequence nameSeq = qnameExpr.eval(contextSequence, contextItem);
if (!nameSeq.hasOne())
throw new XPathException(this, "The name expression should evaluate to a single value");
Item qnItem = nameSeq.itemAt(0);
if (qnItem.getType() == Type.QNAME)
qn = ((QNameValue) qnItem).getQName();
else
name = nameSeq.getStringValue();
} else {
name = this.name;
}
if (qn == null) {
//Not in the specs but... makes sense
if(!XMLChar.isValidName(name))
throw new XPathException(this, ErrorCodes.XPTY0004,
"'" + name + "' is not a valid attribute name");
try {
qn = QName.parse(context, name, null);
} catch (IllegalArgumentException e) {
throw new XPathException(this, ErrorCodes.XPTY0004,
"'" + name + "' is not a valid attribute name");
}
}
String value = this.value;
Sequence valueSeq = null;
if (valueExpr != null) {
valueSeq = valueExpr.eval(contextSequence, contextItem);
} else {
context.pushDocumentContext();
valueSeq = super.eval(contextSequence, contextItem);
context.popDocumentContext();
}
if (!valueSeq.isEmpty()) {
StringBuilder buf = new StringBuilder();
for(SequenceIterator i = valueSeq.iterate(); i.hasNext(); ) {
Item next = i.nextItem();
buf.append(next.getStringValue());
if(i.hasNext())
buf.append(' ');
}
value = buf.toString();
}
if (value == null)
value = "";
node = null;
try {
int nodeNo = builder.addAttribute(qn, value);
node = builder.getDocument().getAttribute(nodeNo);
} catch (DOMException e) {
throw new XPathException(this, ErrorCodes.XQDY0025, e.getMessage());
}
} finally {
if (newDocumentContext)
context.popDocumentContext();
}
if (context.getProfiler().isEnabled())
context.getProfiler().end(this, "", node);
return node;
}
public boolean allowMixedNodesInReturn() {
return true;
}
/* (non-Javadoc)
* @see org.exist.xquery.Expression#dump(org.exist.xquery.util.ExpressionDumper)
*/
public void dump(ExpressionDumper dumper) {
dumper.display("<xsl:attribute");
if (name != null) {
dumper.display(" name = ");
dumper.display(name);
}
if (namespace != null) {
dumper.display(" namespace = ");
dumper.display(namespace);
}
if (select != null) {
dumper.display(" select = ");
dumper.display(select);
}
if (separator != null) {
dumper.display(" separator = ");
dumper.display(separator);
}
if (type != null) {
dumper.display(" type = ");
dumper.display(type);
}
if (validation != null) {
dumper.display(" validation = ");
dumper.display(validation);
}
dumper.display(">");
super.dump(dumper);
dumper.display("</xsl:attribute>");
}
public String toString() {
StringBuilder result = new StringBuilder();
//TODO : consider other prefix ! ("xs" is also quite common) -pb
result.append("<xsl:attribute");
if (name != null)
result.append(" name = "+name.toString());
if (namespace != null)
result.append(" namespace = "+namespace.toString());
if (select != null)
result.append(" select = "+select.toString());
if (separator != null)
result.append(" separator = "+separator.toString());
if (type != null)
result.append(" type = "+type.toString());
if (validation != null)
result.append(" validation = "+validation.toString());
result.append("> ");
result.append(super.toString());
result.append("</xsl:attribute> ");
return result.toString();
}
}