package net.sf.saxon.instruct;
import net.sf.saxon.Controller;
import net.sf.saxon.event.ReceiverOptions;
import net.sf.saxon.event.SequenceReceiver;
import net.sf.saxon.expr.*;
import net.sf.saxon.om.NamespaceConstant;
import net.sf.saxon.om.StandardNames;
import net.sf.saxon.om.Item;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.pattern.NodeKindTest;
import net.sf.saxon.trace.ExpressionPresenter;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.ItemType;
import net.sf.saxon.type.TypeHierarchy;
import net.sf.saxon.value.AnyURIValue;
import net.sf.saxon.value.Whitespace;
import java.util.ArrayList;
import java.util.Iterator;
/**
* A namespace constructor instruction. (xsl:namespace in XSLT 2.0, or namespace{}{} in XQuery 1.1)
*/
public class NamespaceConstructor extends SimpleNodeConstructor {
private Expression name;
/**
* Create an xsl:namespace instruction for dynamic construction of namespace nodes
* @param name the expression to evaluate the name of the node (that is, the prefix)
*/
public NamespaceConstructor(Expression name) {
this.name = name;
adoptChildExpression(name);
}
/**
* Set the name of this instruction for diagnostic and tracing purposes
*/
public int getInstructionNameCode() {
return StandardNames.XSL_NAMESPACE;
}
public Expression simplify(ExpressionVisitor visitor) throws XPathException {
name = visitor.simplify(name);
return super.simplify(visitor);
}
public ItemType getItemType(TypeHierarchy th) {
return NodeKindTest.NAMESPACE;
}
public int getCardinality() {
return StaticProperty.EXACTLY_ONE;
}
protected void promoteInst(PromotionOffer offer) throws XPathException {
if (select != null) {
select = doPromotion(this, select, offer);
}
name = doPromotion(this, name, offer);
super.promoteInst(offer);
}
public void localTypeCheck(ExpressionVisitor visitor, ItemType contextItemType) {}
public Iterator<Expression> iterateSubExpressions() {
ArrayList list = new ArrayList(6);
if (select != null) {
list.add(select);
}
list.add(name);
return list.iterator();
}
/**
* Copy an expression. This makes a deep copy.
*
* @return the copy of the original expression
*/
public Expression copy() {
NamespaceConstructor exp = new NamespaceConstructor(name.copy());
try {
exp.setSelect(select.copy(), getExecutable().getConfiguration());
} catch (XPathException err) {
throw new UnsupportedOperationException(err.getMessage());
}
return exp;
}
/**
* Replace one subexpression by a replacement subexpression
* @param original the original subexpression
* @param replacement the replacement subexpression
* @return true if the original subexpression is found
*/
public boolean replaceSubExpression(Expression original, Expression replacement) {
boolean found = false;
if (select == original) {
select = replacement;
found = true;
}
if (name == original) {
name = replacement;
found = true;
}
return found;
}
private String evaluatePrefix(XPathContext context) throws XPathException {
String prefix = Whitespace.trim(name.evaluateAsString(context));
if (!(prefix.length() == 0 || context.getConfiguration().getNameChecker().isValidNCName(prefix))) {
XPathException err = new XPathException("Namespace prefix is invalid: " + prefix, this);
err.setErrorCode(isXSLT() ? "XTDE0920" : "FORG0001");
err.setXPathContext(context);
throw dynamicError(this, err, context);
}
if (prefix.equals("xmlns")) {
XPathException err = new XPathException("Namespace prefix 'xmlns' is not allowed", this);
err.setErrorCode(isXSLT() ? "XTDE0920" : "XQDY0101");
err.setXPathContext(context);
throw dynamicError(this, err, context);
}
return prefix;
}
public int evaluateNameCode(XPathContext context) throws XPathException {
String prefix = evaluatePrefix(context);
return context.getNamePool().allocate("", "", prefix);
}
public void processValue(CharSequence value, XPathContext context) throws XPathException {
Controller controller = context.getController();
String prefix = evaluatePrefix(context);
String uri = value.toString();
checkPrefixAndUri(prefix, uri, context);
int nscode = controller.getNamePool().allocateNamespaceCode(prefix, uri);
SequenceReceiver out = context.getReceiver();
out.namespace(nscode, ReceiverOptions.REJECT_DUPLICATES);
//return null;
}
/**
* Evaluate as an expression. We rely on the fact that when these instructions
* are generated by XQuery, there will always be a valueExpression to evaluate
* the content
*/
public Item evaluateItem(XPathContext context) throws XPathException {
NodeInfo node = (NodeInfo)super.evaluateItem(context);
String prefix = node.getLocalPart();
String uri = node.getStringValue();
checkPrefixAndUri(prefix, uri, context);
return node;
}
private void checkPrefixAndUri(String prefix, String uri, XPathContext context) throws XPathException {
if (prefix.equals("xml") != uri.equals(NamespaceConstant.XML)) {
XPathException err = new XPathException("Namespace prefix 'xml' and namespace uri " + NamespaceConstant.XML +
" must only be used together", this);
err.setErrorCode(isXSLT() ? "XTDE0925" : "XQDY0101");
err.setXPathContext(context);
throw dynamicError(this, err, context);
}
if (uri.length() == 0) {
XPathException err = new XPathException("Namespace URI is an empty string", this);
err.setErrorCode("XTDE0930");
err.setXPathContext(context);
throw dynamicError(this, err, context);
}
if (!AnyURIValue.isValidURI(uri)) {
XPathException de = new XPathException("The string value of the constructed namespace node must be a valid URI");
de.setErrorCode("XTDE0905");
de.setXPathContext(context);
de.setLocator(this);
throw de;
}
}
/**
* Diagnostic print of expression structure. The abstract expression tree
* is written to the supplied output destination.
*/
public void explain(ExpressionPresenter out) {
out.startElement("namespace");
out.startSubsidiaryElement("name");
name.explain(out);
out.endSubsidiaryElement();
out.startSubsidiaryElement("select");
getSelect().explain(out);
out.endSubsidiaryElement();
out.endElement();
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//