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Groovy example source code file (Reference.java)

This example Groovy source code file (Reference.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

exception, exception, groovyobjectsupport, io, object, object, reference, reference, serializable, t, t

The Groovy Reference.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 groovy.lang;

import org.codehaus.groovy.runtime.InvokerHelper;

import java.io.Serializable;

/**
 * Represents a reference to a value
 * 
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 20474 $
 */
public class Reference<T> extends GroovyObjectSupport implements Serializable {

    private T value;

    public Reference() {
    }

    public Reference(T value) {
        this.value = value;
    }

    public Object getProperty(String property) {
        Object value = get();
        if (value != null) {
            return InvokerHelper.getProperty(value, property);
        }
        return super.getProperty(property);
    }

    public void setProperty(String property, Object newValue) {
        Object value = get();
        if (value != null) {
            InvokerHelper.setProperty(value, property, newValue);
        }
        else {
            super.setProperty(property, newValue);
        }
    }

    public Object invokeMethod(String name, Object args) {
        Object value = get();
        if (value != null) {
            try {
                return InvokerHelper.invokeMethod(value, name, args);
            }
            catch (Exception e) {
                return super.invokeMethod(name, args);
            }
        }
        else {
            return super.invokeMethod(name, args);
        }
    }

    public T get() {
        return value;
    }

    public void set(T value) {
        this.value = value;
    }
}

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