Groovy example source code file (MethodPointerExpression.java)

This example Groovy source code file (MethodPointerExpression.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

class, class, classnode, classnode, expression, expression, methodpointerexpression, methodpointerexpression, string

The Groovy MethodPointerExpression.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.ast.expr;

import groovy.lang.Closure;

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

/**
 * Represents a method pointer on an object such as
 * foo.&bar which means find the method pointer on foo for the method called "bar"
 * which is equivalent to
 * <code>
 * foo.metaClass.getMethodPointer(foo, "bar")
 *
 * @version $Revision: 20590 $
 */
public class MethodPointerExpression extends Expression {

    private Expression expression;
    private Expression methodName;

    public MethodPointerExpression(Expression expression, Expression methodName) {
        this.expression = expression;
        this.methodName = methodName;
    }

    public Expression getExpression() {
        if (expression == null)
            return VariableExpression.THIS_EXPRESSION;
        else
            return expression;
    }

    public Expression getMethodName() {
        return methodName;
    }

    public void visit(GroovyCodeVisitor visitor) {
        visitor.visitMethodPointerExpression(this);
    }

    public Expression transformExpression(ExpressionTransformer transformer) {
        Expression ret;
        Expression mname = transformer.transform(methodName);
        if (expression == null) {
            ret = new MethodPointerExpression(VariableExpression.THIS_EXPRESSION, mname);
        } else {
            ret = new MethodPointerExpression(transformer.transform(expression), mname);
        }
        ret.setSourcePosition(this);
        return ret;
    }

    public String getText() {
        if (expression == null) {
            return "&" + methodName;
        } else {
            return expression.getText() + ".&" + methodName.getText();
        }
    }

    public ClassNode getType() {
        return ClassHelper.CLOSURE_TYPE;
    }

    public boolean isDynamic() {
        return false;
    }

    public Class getTypeClass() {
        return Closure.class;
    }
}