/*
* 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: Comment.java 468650 2006-10-28 07:03:30Z minchau $
*/
package org.apache.xalan.xsltc.compiler;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.GETFIELD;
import org.apache.bcel.generic.INVOKEINTERFACE;
import org.apache.bcel.generic.INVOKEVIRTUAL;
import org.apache.bcel.generic.PUSH;
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;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*/
final class Comment extends Instruction {
public void parseContents(Parser parser) {
parseChildren(parser);
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
typeCheckContents(stable);
return Type.String;
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// Shortcut for literal strings
Text rawText = null;
if (elementCount() == 1) {
Object content = elementAt(0);
if (content instanceof Text) {
rawText = (Text) content;
}
}
// If the content is literal text, call comment(char[],int,int) or
// comment(String), as appropriate. Otherwise, use a
// StringValueHandler to gather the textual content of the xsl:comment
// and call comment(String) with the result.
if (rawText != null) {
il.append(methodGen.loadHandler());
if (rawText.canLoadAsArrayOffsetLength()) {
rawText.loadAsArrayOffsetLength(classGen, methodGen);
final int comment =
cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
"comment",
"([CII)V");
il.append(new INVOKEINTERFACE(comment, 4));
} else {
il.append(new PUSH(cpg, rawText.getText()));
final int comment =
cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
"comment",
"(" + STRING_SIG + ")V");
il.append(new INVOKEINTERFACE(comment, 2));
}
} else {
// Save the current handler base on the stack
il.append(methodGen.loadHandler());
il.append(DUP); // first arg to "comment" call
// Get the translet's StringValueHandler
il.append(classGen.loadTranslet());
il.append(new GETFIELD(cpg.addFieldref(TRANSLET_CLASS,
"stringValueHandler",
STRING_VALUE_HANDLER_SIG)));
il.append(DUP);
il.append(methodGen.storeHandler());
// translate contents with substituted handler
translateContents(classGen, methodGen);
// get String out of the handler
il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_VALUE_HANDLER,
"getValue",
"()" + STRING_SIG)));
// call "comment"
final int comment =
cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
"comment",
"(" + STRING_SIG + ")V");
il.append(new INVOKEINTERFACE(comment, 2));
// Restore old handler base from stack
il.append(methodGen.storeHandler());
}
}
}