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Groovy example source code file (

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

Java - Groovy tags/keywords

classnode, classnode, expression, string, string, super_expression, this_expression, variable, variable, variableexpression, variableexpression

The Groovy 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.codehaus.groovy.ast.expr;

import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.GroovyCodeVisitor;
import org.codehaus.groovy.ast.Variable;

 * Represents a local variable name, the simplest form of expression. e.g. "foo".
 * @author <a href="">James Strachan
 * @version $Revision: 21216 $
public class VariableExpression extends Expression implements Variable {
    // The following fields are only used internally; every occurrence of a user-defined expression of the same kind
    // has its own instance so as to preserve line information. Consequently, to test for such an expression, don't
    // compare against the field but call isXXXExpression() instead.
    public static final VariableExpression THIS_EXPRESSION = new VariableExpression("this", ClassHelper.DYNAMIC_TYPE);
    public static final VariableExpression SUPER_EXPRESSION = new VariableExpression("super", ClassHelper.DYNAMIC_TYPE);

    private String variable;
    private int modifiers;
    private boolean inStaticContext;
    private boolean isDynamicTyped=false;
    private Variable accessedVariable;
    boolean closureShare=false;
    boolean useRef=false;
    private ClassNode originType;

    public Variable getAccessedVariable() {
        return accessedVariable;

    public void setAccessedVariable(Variable origin) {
        this.accessedVariable = origin;

    public VariableExpression(String variable, ClassNode type) {
        this.variable = variable;
        originType = type;
    public VariableExpression(String variable) {
        this(variable, ClassHelper.DYNAMIC_TYPE);
    public VariableExpression(Variable variable) {
        this(variable.getName(), variable.getOriginType());

    public void visit(GroovyCodeVisitor visitor) {

    public Expression transformExpression(ExpressionTransformer transformer) {
        return this;

    public String getText() {
        return variable;
    public String getName() {
        return variable;

    public String toString() {
        return super.toString() + "[variable: " + variable + (this.isDynamicTyped() ? "" : " type: " + getType()) + "]";

    public Expression getInitialExpression() {
        return null;

    public boolean hasInitialExpression() {
        return false;
    public boolean isInStaticContext() {
        if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.isInStaticContext();
        return inStaticContext;
    public void setInStaticContext(boolean inStaticContext) {
        this.inStaticContext = inStaticContext;

    public void setType(ClassNode cn){
        isDynamicTyped |= ClassHelper.DYNAMIC_TYPE==cn;
    public boolean isDynamicTyped() {
        if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.isDynamicTyped();
        return isDynamicTyped;

    public boolean isClosureSharedVariable() {
        if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.isClosureSharedVariable();
        return closureShare;
    public void setClosureSharedVariable(boolean inClosure) {
        closureShare = inClosure;        

    public int getModifiers() {
        return modifiers;

    public void setUseReferenceDirectly(boolean useRef) {
        this.useRef = useRef;        
    public boolean isUseReferenceDirectly() {
        return useRef;
    public ClassNode getType() {
        if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.getType();
        return super.getType();

    public ClassNode getOriginType() {
        if (accessedVariable!=null && accessedVariable!=this) return accessedVariable.getOriginType();
        return originType;

    public boolean isThisExpression() {
        return "this".equals(variable);

    public boolean isSuperExpression() {
        return "super".equals(variable);

    public void setModifiers(int modifiers) {
        this.modifiers = modifiers;

Other Groovy examples (source code examples)

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