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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

annotatednode, class, classnode, classnode, expression, expression, expressiontransformer, expressiontransformer, list, list, t, transformed, util

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 java.util.ArrayList;
import java.util.List;

import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.AnnotatedNode;
import org.codehaus.groovy.GroovyBugError;

 * Represents a base class for expressions which evaluate as an object
 * @author <a href="">James Strachan
 * @version $Revision: 17114 $
public abstract class Expression extends AnnotatedNode {

    private ClassNode type=ClassHelper.DYNAMIC_TYPE;
     * Return a copy of the expression calling the transformer on any nested expressions 
     * @param transformer
    public abstract Expression transformExpression(ExpressionTransformer transformer);

     * Transforms the list of expressions
     * @return a new list of transformed expressions
    protected List<Expression> transformExpressions(List expressions, ExpressionTransformer transformer) {
        List<Expression> list = new ArrayList(expressions.size());
        for (Expression expr : expressions ) {
        return list;

     * Transforms the list of expressions, and checks that all transformed expressions have the given type.
     * @return a new list of transformed expressions
    protected <T extends Expression> List transformExpressions(List expressions,
            ExpressionTransformer transformer, Class<T> transformedType) {
        List<T> list = new ArrayList(expressions.size());
        for (Expression expr : expressions) {
            Expression transformed = transformer.transform(expr);
            if (!transformedType.isInstance(transformed))
                throw new GroovyBugError(String.format("Transformed expression should have type %s but has type %s",
                    transformedType, transformed.getClass()));
        return list;
    public ClassNode getType() {
        return type;
    public void setType(ClassNode t) {

Other Groovy examples (source code examples)

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