com.bbs.util.PartialCollection.java Source code

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Here is the source code for com.bbs.util.PartialCollection.java

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/*
 *  Copyright 2004 Blandware (http://www.blandware.com)
 *
 *  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 com.bbs.util;

import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

/**
 * <p>This collection contains part of some collection of entities and
 * total number of elements of initial collection
 * </p>
 *
 * @author Sergey Zubtcovskii <a href="mailto:sergey.zubtcovskii@blandware.com">&lt;sergey.zubtcovskii@blandware.com&gt;</a>
 * @version $Revision$ $Date$
 */
public class PartialCollection implements Collection, Serializable {

    /**
     * Collection of entities (part of some another collection)
     */
    private Collection collection;

    /**
     * Total number of elements in collection this collection is part of
     */
    private Integer total;

    /**
     * Creates new instance of PartialCollection with specified collection and total
     *
     * @param collection Part of some collection of entities
     * @param total      Total size of collection, which part is contained in this instance
     */
    public PartialCollection(Collection collection, int total) {
        this(collection, new Integer(total));
    }

    /**
     * Creates an empty instance of PartialCollection
     */
    public PartialCollection() {
        this(new ArrayList(), 0);
    }

    /**
     * Creates new instance of PartialCollection with specified collection and total
     *
     * @param collection Part of some collection of entities
     * @param total      Total size of collection, which part is contained in this instance
     */
    public PartialCollection(Collection collection, Integer total) {
        this.collection = collection;
        this.total = total;
    }

    /**
     * Represents this collection as list
     *
     * @return list representing this collection
     */
    public List asList() {
        List result = null;
        if (collection != null) {
            if (!(collection instanceof List)) {
                result = new ArrayList(collection);
            } else {
                result = (List) collection;
            }
        }
        return result;
    }

    /**
     * Gets the size of part of initial collection that is contained here
     *
     * @return number of elements in partial collection
     */
    public int size() {
        return collection.size();
    }

    /**
     * Clears the partial collection
     */
    public void clear() {
        collection.clear();
    }

    /**
     * Figures out is partial collection empty
     *
     * @return <code>true</code> if this collection is empty
     */
    public boolean isEmpty() {
        return collection.isEmpty();
    }

    public Object[] toArray() {
        return collection.toArray();
    }

    public boolean add(Object o) {
        return collection.add(o);
    }

    public boolean contains(Object o) {
        return collection.contains(o);
    }

    public boolean remove(Object o) {
        return collection.remove(o);
    }

    public boolean addAll(Collection c) {
        return collection.addAll(c);
    }

    public boolean containsAll(Collection c) {
        return collection.containsAll(c);
    }

    public boolean removeAll(Collection c) {
        return collection.removeAll(c);
    }

    public boolean retainAll(Collection c) {
        return collection.retainAll(c);
    }

    public Iterator iterator() {
        return collection.iterator();
    }

    public Object[] toArray(Object[] a) {
        return collection.toArray(a);
    }

    /**
     * Gets total number of elements in initial collection
     *
     * @return total number of elements
     */
    public Integer getTotal() {
        return total;
    }

    //   public String toString() {
    //      StringBuffer sb = new StringBuffer("[rows=[");
    //      for ( Iterator i = collection.iterator(); i.hasNext(); ) {
    //         sb.append(i.next());
    //         if ( i.hasNext() ) {
    //            sb.append(", ");
    //         }
    //      }
    //      sb.append("];\n");
    //      sb.append("]");
    //      return sb.toString();
    //   }

    public String toString() {
        return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);
    }
}