001/*
002 *  Copyright 2001-2006 Stephen Colebourne
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.joda.primitives.collection.impl;
017
018import org.joda.primitives.PrimitiveCollectable;
019
020/**
021 * Abstract base class for collections of primitive elements.
022 *
023 * @author Stephen Colebourne
024 * @since 1.0
025 */
026public abstract class AbstractPrimitiveCollectable<N> implements PrimitiveCollectable<N> {
027
028    /**
029     * Constructor.
030     */
031    protected AbstractPrimitiveCollectable() {
032        super();
033    }
034
035    // PrimitiveCollectable
036    //-----------------------------------------------------------------------
037    /**
038     * Optimizes the implementation after initialization.
039     * <p>
040     * This implementation does nothing.
041     */
042    public void optimize() {
043        // do nothing
044    }
045
046    /**
047     * Checks whether the object can currently be modified.
048     * <p>
049     * This implementation returns false.
050     *
051     * @return <code>false</code>
052     */
053    public boolean isModifiable() {
054        return false;
055    }
056
057    /**
058     * Checks if the collection is empty.
059     *
060     * @return true if empty
061     */
062    public boolean isEmpty() {
063        return (size() == 0);
064    }
065
066    /**
067     * Clone implementation that calls Object clone().
068     * 
069     * @return the clone
070     */
071    public Object clone() {
072        try {
073            return super.clone();
074        } catch (Exception ex) {
075            throw new UnsupportedOperationException("Clone not supported");
076        }
077    }
078
079}