/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: ApplyImports.java 469276 2006-10-30 21:09:47Z minchau $
*/
package org.apache.xalan.xsltc.compiler;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.INVOKEVIRTUAL;
import org.apache.bcel.generic.InstructionList;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
import org.apache.xalan.xsltc.compiler.util.Util;
final class ApplyImports extends Instruction {
private QName _modeName;
private int _precedence;
public void display(int indent) {
indent(indent);
Util.println("ApplyTemplates");
indent(indent + IndentIncrement);
if (_modeName != null) {
indent(indent + IndentIncrement);
Util.println("mode " + _modeName);
}
}
/**
* Returns true if this <xsl:apply-imports/> element has parameters
*/
public boolean hasWithParams() {
return hasContents();
}
/**
* Determine the lowest import precedence for any stylesheet imported
* or included by the stylesheet in which this <xsl:apply-imports/>
* element occured. The templates that are imported by the stylesheet in
* which this element occured will all have higher import precedence than
* the integer returned by this method.
*/
private int getMinPrecedence(int max) {
// Move to root of include tree
Stylesheet includeRoot = getStylesheet();
while (includeRoot._includedFrom != null) {
includeRoot = includeRoot._includedFrom;
}
return includeRoot.getMinimumDescendantPrecedence();
}
/**
* Parse the attributes and contents of an <xsl:apply-imports/> element.
*/
public void parseContents(Parser parser) {
// Indicate to the top-level stylesheet that all templates must be
// compiled into separate methods.
Stylesheet stylesheet = getStylesheet();
stylesheet.setTemplateInlining(false);
// Get the mode we are currently in (might not be any)
Template template = getTemplate();
_modeName = template.getModeName();
_precedence = template.getImportPrecedence();
parseChildren(parser); // with-params
}
/**
* Type-check the attributes/contents of an <xsl:apply-imports/> element.
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
typeCheckContents(stable); // with-params
return Type.Void;
}
/**
* Translate call-template. A parameter frame is pushed only if
* some template in the stylesheet uses parameters.
*/
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final Stylesheet stylesheet = classGen.getStylesheet();
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
final int current = methodGen.getLocalIndex("current");
// Push the arguments that are passed to applyTemplates()
il.append(classGen.loadTranslet());
il.append(methodGen.loadDOM());
il.append(methodGen.loadIterator());
il.append(methodGen.loadHandler());
il.append(methodGen.loadCurrentNode());
// Push a new parameter frame in case imported template might expect
// parameters. The apply-imports has nothing that it can pass.
if (stylesheet.hasLocalParams()) {
il.append(classGen.loadTranslet());
final int pushFrame = cpg.addMethodref(TRANSLET_CLASS,
PUSH_PARAM_FRAME,
PUSH_PARAM_FRAME_SIG);
il.append(new INVOKEVIRTUAL(pushFrame));
}
// Get the [min,max> precedence of all templates imported under the
// current stylesheet
final int maxPrecedence = _precedence;
final int minPrecedence = getMinPrecedence(maxPrecedence);
final Mode mode = stylesheet.getMode(_modeName);
// Get name of appropriate apply-templates function for this
// xsl:apply-imports instruction
String functionName = mode.functionName(minPrecedence, maxPrecedence);
// Construct the translet class-name and the signature of the method
final String className = classGen.getStylesheet().getClassName();
final String signature = classGen.getApplyTemplatesSigForImport();
final int applyTemplates = cpg.addMethodref(className,
functionName,
signature);
il.append(new INVOKEVIRTUAL(applyTemplates));
// Pop any parameter frame that was pushed above.
if (stylesheet.hasLocalParams()) {
il.append(classGen.loadTranslet());
final int pushFrame = cpg.addMethodref(TRANSLET_CLASS,
POP_PARAM_FRAME,
POP_PARAM_FRAME_SIG);
il.append(new INVOKEVIRTUAL(pushFrame));
}
}
}