/*
* @(#)$Id$
*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2001, Sun
* Microsystems., http://www.sun.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*
*/
package org.apache.xalan.xsltc.compiler;
import java.util.Hashtable;
import java.util.Enumeration;
import java.util.Vector;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.apache.xalan.xsltc.compiler.util.Type;
import de.fub.bytecode.generic.*;
import org.apache.xalan.xsltc.compiler.util.*;
final class LiteralElement extends Instruction {
private String _name;
private Hashtable _accessedPrefixes = null;
private LiteralElement _parent;
private Vector _attributeElements = null;
private final static String XMLNS_STRING = "xmlns";
/**
* Returns the QName for this literal element
*/
public QName getName() {
return _qname;
}
/**
* Displays the contents of this literal element
*/
public void display(int indent) {
indent(indent);
Util.println("LiteralElement name = " + _name);
displayContents(indent + IndentIncrement);
}
/**
* Returns the namespace URI for which a prefix is pointing to
*/
public String accessedNamespace(String prefix) {
if (_accessedPrefixes == null)
return(null);
else
return((String)_accessedPrefixes.get(prefix));
}
/**
* Method used to keep track of what namespaces that are references by
* this literal element and its attributes. The output must contain a
* definition for each namespace, so we stuff them in a hashtable.
*/
public void registerNamespace(String prefix, String uri,
SymbolTable stable, boolean declared) {
// Check if the parent has a declaration for this namespace
if (_parent != null) {
final String parentUri = _parent.accessedNamespace(prefix);
if (parentUri == null) {
_parent.registerNamespace(prefix, uri, stable, declared);
return;
}
if (parentUri.equals(uri)) return;
}
// Check if we have any declared namesaces
if (_accessedPrefixes == null) {
_accessedPrefixes = new Hashtable();
}
else {
if (!declared) {
// Check if this node has a declaration for this namespace
final String old = (String)_accessedPrefixes.get(prefix);
if (old != null) {
if (old.equals(uri))
return;
else
prefix = stable.generateNamespacePrefix();
}
}
}
if (!prefix.equals("xml")) {
_accessedPrefixes.put(prefix,uri);
}
}
/**
* Translates the prefix of a QName according to the rules set in
* the attributes of xsl:stylesheet. Also registers a QName to assure
* that the output element contains the necessary namespace declarations.
*/
private String translateQName(QName qname, SymbolTable stable) {
// Break up the QName and get prefix:localname strings
String localname = qname.getLocalPart();
String prefix = qname.getPrefix();
// Treat default namespace as "" and not null
if (prefix == null)
prefix = Constants.EMPTYSTRING;
else if (prefix.equals(XMLNS_STRING))
return(XMLNS_STRING);
// Check if we must translate the prefix
final String alternative = stable.lookupPrefixAlias(prefix);
if (alternative != null) {
stable.excludeNamespaces(prefix);
prefix = alternative;
}
// Get the namespace this prefix refers to
String uri = lookupNamespace(prefix);
if (uri == null) return(localname);
// Register the namespace as accessed
registerNamespace(prefix, uri, stable, false);
// Construct the new name for the element (may be unchanged)
if (prefix != Constants.EMPTYSTRING)
return(prefix+":"+localname);
else
return(localname);
}
/**
* Add an attribute to this element
*/
public void addAttribute(SyntaxTreeNode attribute) {
if (_attributeElements == null) {
_attributeElements = new Vector(2);
}
_attributeElements.add(attribute);
}
/**
* Set the first attribute of this element
*/
public void setFirstAttribute(SyntaxTreeNode attribute) {
if (_attributeElements == null) {
_attributeElements = new Vector(2);
}
_attributeElements.insertElementAt(attribute,0);
}
/**
* Type-check the contents of this element. The element itself does not
* need any type checking as it leaves nothign on the JVM's stack.
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
// Type-check all attributes
if (_attributeElements != null) {
final int count = _attributeElements.size();
for (int i = 0; i < count; i++) {
SyntaxTreeNode node =
(SyntaxTreeNode)_attributeElements.elementAt(i);
node.typeCheck(stable);
}
}
typeCheckContents(stable);
return Type.Void;
}
/**
* This method starts at a given node, traverses all namespace mappings,
* and assembles a list of all prefixes that (for the given node) maps
* to _ANY_ namespace URI. Used by literal result elements to determine
*/
public Enumeration getNamespaceScope(SyntaxTreeNode node) {
Hashtable all = new Hashtable();
while (node != null) {
Hashtable mapping = node.getPrefixMapping();
if (mapping != null) {
Enumeration prefixes = mapping.keys();
while (prefixes.hasMoreElements()) {
String prefix = (String)prefixes.nextElement();
if (!all.containsKey(prefix)) {
all.put(prefix, mapping.get(prefix));
}
}
}
node = node.getParent();
}
return(all.keys());
}
/**
* Determines the final QName for the element and its attributes.
* Registers all namespaces that are used by the element/attributes
*/
public void parseContents(Parser parser) {
final SymbolTable stable = parser.getSymbolTable();
stable.setCurrentNode(this);
// Find the closest literal element ancestor (if there is one)
SyntaxTreeNode _parent = getParent();
while ((_parent != null) && !(_parent instanceof LiteralElement))
_parent = _parent.getParent();
if (!(_parent instanceof LiteralElement))
_parent = null;
_name = translateQName(_qname, stable);
// Process all attributes and register all namespaces they use
final int count = _attributes.getLength();
for (int i = 0; i < count; i++) {
final QName qname = parser.getQName(_attributes.getQName(i));
final String uri = qname.getNamespace();
final String val = _attributes.getValue(i);
// Handle xsl:use-attribute-sets. Attribute sets are placed first
// in the vector or attributes to make sure that later local
// attributes can override an attributes in the set.
if (qname == parser.getUseAttributeSets()) {
setFirstAttribute(new UseAttributeSets(val, parser));
}
// Ignore all other attributes in XSL namespace
else if ((uri != null) && (uri.equals(XSLT_URI))) {
}
// Handle xsl:extension-element-prefixes
else if (qname == parser.getExtensionElementPrefixes()) {
stable.excludeNamespaces(val);
}
// Handle xsl:exclude-result-prefixes
else if (qname == parser.getExcludeResultPrefixes()) {
stable.excludeNamespaces(val);
}
// Handle literal attributes (attributes not in XSL namespace)
else {
final String name = translateQName(qname, stable);
LiteralAttribute attr = new LiteralAttribute(name, val, parser);
addAttribute(attr);
attr.setParent(this);
attr.parseContents(parser);
}
}
// Register all namespaces that are in scope, except for those that
// are listed in the xsl:stylesheet element's *-prefixes attributes
final Enumeration include = getNamespaceScope(this);
while (include.hasMoreElements()) {
final String prefix = (String)include.nextElement();
if (!prefix.equals("xml")) {
final String uri = lookupNamespace(prefix);
if ((uri != null) && (!uri.equals(XSLT_URI))) {
if (!stable.isExcludedNamespace(uri))
registerNamespace(prefix,uri,stable,true);
}
}
}
parseChildren(parser);
// Process all attributes and register all namespaces they use
for (int i = 0; i < count; i++) {
final QName qname = parser.getQName(_attributes.getQName(i));
final String val = _attributes.getValue(i);
// Handle xsl:extension-element-prefixes
if (qname == parser.getExtensionElementPrefixes()) {
stable.unExcludeNamespaces(val);
}
// Handle xsl:exclude-result-prefixes
else if (qname == parser.getExcludeResultPrefixes()) {
stable.unExcludeNamespaces(val);
}
}
}
/**
*
*/
public boolean contextDependent() {
return dependentContents();
}
/**
* Compiles code that emits the literal element to the output handler,
* first the start tag, then namespace declaration, then attributes,
* then the element contents, and then the element end tag.
*/
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// Compile code to emit element start tag
il.append(methodGen.loadHandler());
il.append(new PUSH(cpg, _name));
il.append(DUP2); // duplicate these 2 args for endElement
il.append(methodGen.startElement());
// Output all attributes
if (_attributeElements != null) {
final int count = _attributeElements.size();
for (int i = 0; i < count; i++) {
SyntaxTreeNode node =
(SyntaxTreeNode)_attributeElements.elementAt(i);
node.translate(classGen, methodGen);
}
}
// Compile code to emit namespace attributes
if (_accessedPrefixes != null) {
Enumeration e = _accessedPrefixes.keys();
while (e.hasMoreElements()) {
final String prefix = (String)e.nextElement();
final String uri = (String)_accessedPrefixes.get(prefix);
if ((uri != Constants.EMPTYSTRING) ||
(prefix != Constants.EMPTYSTRING)) {
il.append(methodGen.loadHandler());
il.append(new PUSH(cpg,prefix));
il.append(new PUSH(cpg,uri));
il.append(methodGen.namespace());
}
}
}
// Compile code to emit attributes and child elements
translateContents(classGen, methodGen);
// Compile code to emit element end tag
il.append(methodGen.endElement());
}
}