/*
* @(#)$Id$
*
* 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.Vector;
import java.util.Enumeration;
import java.util.Hashtable;
import org.apache.xalan.xsltc.compiler.util.Type;
import de.fub.bytecode.generic.*;
import de.fub.bytecode.classfile.JavaClass;
import org.apache.xalan.xsltc.compiler.util.*;
public final class Template extends TopLevelElement {
private QName _name; // The name of the template (if any)
private QName _mode; // Mode in which this template is instantiated.
private Pattern _pattern; // Matching pattern defined for this template.
private double _priority; // Matching priority of this template.
private int _position; // Position within stylesheet (prio. resolution)
private boolean _disabled = false;
private boolean _compiled = false;//make sure it is compiled only once
/**
* Set to <tt>true</tt> by the XPath parser if this template
* needs to create a variable frame. Variable frames are needed
* when certain parts of a template are compiled in external
* classes (e.g., predicates, xsl:number, xsl:sort).
*/
private boolean _hasVariableFrame;
private boolean _hasParams = false;
private boolean _simplified = false;
public boolean hasParams() {
return _hasParams;
}
public void hasParams(boolean hasParams) {
_hasParams = hasParams;
}
public boolean isSimplified() {
return(_simplified);
}
public void setSimplified() {
_simplified = true;
}
public void disable() {
_disabled = true;
}
public boolean disabled() {
return(_disabled);
}
public double getPriority() {
return _priority;
}
public int getPosition() {
return(_position);
}
public boolean isNamed() {
return _name != null;
}
public Pattern getPattern() {
return _pattern;
}
public QName getName() {
return _name;
}
public QName getModeName() {
return _mode;
}
private Hashtable _variables;
private int _nextIndex;
public int allocateIndex(QName varName) {
if (_variables == null) { // first time
_hasVariableFrame = true;
(_variables = new Hashtable()).put(varName, new Integer(0));
_nextIndex = 1;
return 0;
}
else {
Integer index = (Integer)_variables.get(varName);
if (index == null) {
_variables.put(varName, index = new Integer(_nextIndex++));
}
return index.intValue();
}
}
private final int localVariablesCount() {
return _variables == null ? 0 : _variables.size();
}
public void display(int indent) {
Util.println('\n');
indent(indent);
if (_name != null) {
indent(indent);
Util.println("name = " + _name);
}
else if (_pattern != null) {
indent(indent);
Util.println("match = " + _pattern.toString());
}
if (_mode != null) {
indent(indent);
Util.println("mode = " + _mode);
}
displayContents(indent + IndentIncrement);
}
private boolean resolveNamedTemplates(Template other, Parser parser) {
if (other == null) return true;
SymbolTable stable = parser.getSymbolTable();
final int us = this.getImportPrecedence();
final int them = other.getImportPrecedence();
if (us > them) {
other.disable();
return true;
}
else if (us < them) {
stable.addTemplate(other);
this.disable();
return true;
}
else {
return false;
}
}
private Stylesheet _stylesheet = null;
protected Stylesheet getStylesheet() {
return _stylesheet;
}
public void parseContents(Parser parser) {
final String name = getAttribute("name");
final String mode = getAttribute("mode");
final String match = getAttribute("match");
final String priority = getAttribute("priority");
_stylesheet = super.getStylesheet();
if (name.length() > 0) {
_name = parser.getQName(name);
}
if (mode.length() > 0) {
_mode = parser.getQName(mode);
}
if (match.length() > 0) {
_pattern = parser.parsePattern(this, "match", null);
}
if (priority.length() > 0) {
_priority = Double.parseDouble(priority);
}
else {
if (_pattern != null)
_priority = _pattern.getPriority();
else
_priority = Double.NaN;
}
_position = parser.getTemplateIndex();
// Add the (named) template to the symbol table
if (_name != null) {
Template other = parser.getSymbolTable().addTemplate(this);
if (!resolveNamedTemplates(other, parser)) {
parser.reportError( Constants.ERROR,
new ErrorMsg(ErrorMsg.TMPREDEF_ERR,_name,this));
}
}
parser.setTemplate(this); // set current template
parseChildren(parser);
parser.setTemplate(null); // clear template
}
/**
* When the parser realises that it is dealign with a simplified stylesheet
* it will create an empty Stylesheet object with the root element of the
* stylesheet (a LiteralElement object) as its only child. The Stylesheet
* object will then create this Template object and invoke this method to
* force some specific behaviour. What we need to do is:
* o) create a pattern matching on the root node
* o) add the LRE root node (the only child of the Stylesheet) as our
* only child node
* o) set the empty Stylesheet as our parent
* o) set this template as the Stylesheet's only child
*/
public void parseSimplified(Stylesheet stylesheet, Parser parser) {
_stylesheet = stylesheet;
setParent(stylesheet);
_name = null;
_mode = null;
_priority = Double.NaN;
_pattern = parser.parsePattern(this, "/");
final Vector contents = _stylesheet.getContents();
final SyntaxTreeNode root = (SyntaxTreeNode)contents.elementAt(0);
if (root instanceof LiteralElement) {
addElement(root);
root.setParent(this);
contents.set(0, this);
parser.setTemplate(this);
root.parseContents(parser);
parser.setTemplate(null);
}
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
if (_pattern != null) {
_pattern.typeCheck(stable);
}
return typeCheckContents(stable);
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
if (_disabled) return;
// bug fix #4433133, add a call to named template from applyTemplates
String className = classGen.getClassName();
final String DOM_CLASS_SIG = classGen.getDOMClassSig();
if (_compiled && isNamed()){
il.append(classGen.loadTranslet());
il.append(methodGen.loadDOM());
il.append(methodGen.loadIterator());
il.append(methodGen.loadHandler());
il.append(methodGen.loadCurrentNode());
il.append(new INVOKEVIRTUAL(cpg.addMethodref(className,
_name.toString(),
"("
+ DOM_CLASS_SIG
+ NODE_ITERATOR_SIG
+ TRANSLET_OUTPUT_SIG
+ "I)V")));
return;
}
_compiled = true;
if (_hasVariableFrame) {
il.append(classGen.loadTranslet());
il.append(new PUSH(cpg, localVariablesCount()));
il.append(new INVOKEVIRTUAL(cpg.addMethodref(TRANSLET_CLASS,
PUSH_VAR_FRAME,
PUSH_VAR_FRAME_SIG)));
}
final InstructionHandle start = il.getEnd();
translateContents(classGen, methodGen);
final InstructionHandle end = il.getEnd();
il.setPositions(true);
if (_hasVariableFrame) {
il.append(classGen.loadTranslet());
il.append(new INVOKEVIRTUAL(cpg.addMethodref(TRANSLET_CLASS,
POP_VAR_FRAME,
POP_VAR_FRAME_SIG)));
}
}
}