org.apache.xalan.xsltc.compiler.util.NamedMethodGenerator Maven / Gradle / Ivy

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Xalan-Java is an XSLT processor for transforming XML documents into HTML, text, or other XML document types. It implements XSL Transformations (XSLT) Version 1.0 and XML Path Language (XPath) Version 1.0 and can be used from the command line, in an applet or a servlet, or as a module in other program.

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/*
 * 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: NamedMethodGenerator.java 468649 2006-10-28 07:00:55Z minchau $
 */

package org.apache.xalan.xsltc.compiler.util;

import org.apache.bcel.generic.ALOAD;
import org.apache.bcel.generic.ASTORE;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.Instruction;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.Type;

/**
 * This class is used for named templates. Named template methods have access
 * to the DOM, the current iterator, the handler and the current node.
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 */
public final class NamedMethodGenerator extends MethodGenerator {
    protected static final int CURRENT_INDEX  = 4;
    
    // The index of the first parameter (after dom/iterator/handler/current)
    private static final int PARAM_START_INDEX = 5;

    public NamedMethodGenerator(int access_flags, Type return_type,
				Type[] arg_types, String[] arg_names,
				String method_name, String class_name,
				InstructionList il, ConstantPoolGen cp) {
	super(access_flags, return_type, arg_types, arg_names, method_name, 
	      class_name, il, cp);
    }

    public int getLocalIndex(String name) {
	if (name.equals("current")) {
	    return CURRENT_INDEX;
	}
	return super.getLocalIndex(name);
    }

    public Instruction loadParameter(int index) {
        return new ALOAD(index + PARAM_START_INDEX);
    }
    
    public Instruction storeParameter(int index) {
        return new ASTORE(index + PARAM_START_INDEX);
    }
}