/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.Serial;
import java.io.Serializable;

/**
 * Represents a reference to a value
 */
public class Reference<T> extends GroovyObjectSupport implements Serializable {

    @Serial private static final long serialVersionUID = 4963704631487573488L;
    private T value;

    /**
     * Creates an empty reference.
     */
    public Reference() {
    }

    /**
     * Creates a reference initialized with the supplied value.
     *
     * @param value the initial value
     */
    public Reference(T value) {
        this.value = value;
    }

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

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

    /**
     * {@inheritDoc}
     */
    @Override
    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);
        }
    }

    /**
     * Returns the referenced value.
     *
     * @return the referenced value
     */
    public T get() {
        return value;
    }

    /**
     * Updates the referenced value.
     *
     * @param value the new value
     */
    public void set(T value) {
        this.value = value;
    }
}
