package client.net.sf.saxon.ce.expr.instruct;
import client.net.sf.saxon.ce.Controller;
import client.net.sf.saxon.ce.event.ReceiverOptions;
import client.net.sf.saxon.ce.event.SequenceReceiver;
import client.net.sf.saxon.ce.expr.*;
import client.net.sf.saxon.ce.lib.NamespaceConstant;
import client.net.sf.saxon.ce.lib.StandardURIChecker;
import client.net.sf.saxon.ce.om.*;
import client.net.sf.saxon.ce.pattern.NodeKindTest;
import client.net.sf.saxon.ce.trans.XPathException;
import client.net.sf.saxon.ce.type.ItemType;
import client.net.sf.saxon.ce.type.TypeHierarchy;
import client.net.sf.saxon.ce.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(select, offer);
}
name = doPromotion(name, offer);
super.promoteInst(offer);
}
public void localTypeCheck(ExpressionVisitor visitor, ItemType contextItemType) throws XPathException {
name = visitor.typeCheck(name, contextItemType);
}
public Iterator<Expression> iterateSubExpressions() {
ArrayList list = new ArrayList(6);
if (select != null) {
list.add(select);
}
list.add(name);
return list.iterator();
}
/**
* 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 || NameChecker.isValidNCName(prefix))) {
dynamicError("Namespace prefix is invalid: " + prefix, "XTDE0920", context);
}
if (prefix.equals("xmlns")) {
dynamicError("Namespace prefix 'xmlns' is not allowed", "XTDE0920", 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);
SequenceReceiver out = context.getReceiver();
out.namespace(new NamespaceBinding(prefix, uri), ReceiverOptions.REJECT_DUPLICATES);
}
/**
* 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)) {
dynamicError("Namespace prefix 'xml' and namespace uri " + NamespaceConstant.XML +
" must only be used together", "XTDE0925", context);
}
if (uri.length() == 0) {
dynamicError("Namespace URI is an empty string", "XTDE0930", context);
}
if (uri.equals(NamespaceConstant.XMLNS)) {
dynamicError("A namespace node cannot have the reserved namespace " +
NamespaceConstant.XMLNS, "XTDE0935", context);
}
if (!StandardURIChecker.getInstance().isValidURI(uri)) {
dynamicError("The string value of the constructed namespace node must be a valid URI", "XTDE0905", context);
}
}
}
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.