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Groovy example source code file (BytecodeVariable.java)

This example Groovy source code file (BytecodeVariable.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

bytecodevariable, bytecodevariable, classnode, classnode, label, label, string, string, super_variable, this_variable

The Groovy BytecodeVariable.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * Licensed 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.
 */
package org.codehaus.groovy.classgen.asm;

import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.objectweb.asm.Label;

/**
 * Represents compile time variable metadata while compiling a method.
 * 
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @author <a href="mailto:blackdrag@gmx.org">Jochen Theodorou
 * @version $Revision: 21032 $
 */
public class BytecodeVariable {
    
    public static final BytecodeVariable THIS_VARIABLE = new BytecodeVariable();
    public static final BytecodeVariable SUPER_VARIABLE = new BytecodeVariable();

    private int index;
    private ClassNode type;
    private String name;
    private final int prevCurrent;
    private boolean holder;

    // br for setting on the LocalVariableTable in the class file
    // these fields should probably go to jvm Operand class
    private Label startLabel = null;
    private Label endLabel = null;
    private boolean dynamicTyped;

    private BytecodeVariable(){
        dynamicTyped = true;
        index=0;
        holder=false;
        prevCurrent=0;
    }
    
    public BytecodeVariable(int index, ClassNode type, String name, int prevCurrent) {
        this.index = index;
        this.type = type;
        this.name = name;
        this.prevCurrent = prevCurrent;
    }

    public String getName() {
        return name;
    }

    public ClassNode getType() {
        return type;
    }
 
    /**
     * @return the stack index for this variable
     */
    public int getIndex() {
        return index;
    }

    /**
     * @return is this local variable shared in other scopes (and so must use a ValueHolder)
     */
    public boolean isHolder() {
        return holder;
    }

    public void setHolder(boolean holder) {
        this.holder = holder;
    }
    
    public Label getStartLabel() {
        return startLabel;
    }

    public void setStartLabel(Label startLabel) {
        this.startLabel = startLabel;
    }

    public Label getEndLabel() {
        return endLabel;
    }

    public void setEndLabel(Label endLabel) {
        this.endLabel = endLabel;
    }

    public String toString() {
        return name + "(index=" + index + ",type=" + type + ",holder="+holder+")";
    }

    public void setType(ClassNode type) {
        this.type = type;
        dynamicTyped |= type==ClassHelper.DYNAMIC_TYPE;
    }

    public void setDynamicTyped(boolean b) {
        dynamicTyped = b;
    }
    
    public boolean isDynamicTyped() {
        return dynamicTyped;
    }

    public int getPrevIndex() {
        return prevCurrent;
    }
}

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