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Commons Collections example source code file (PredicatedList.java)

This example Commons Collections source code file (PredicatedList.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 - Commons Collections tags/keywords

abstractlistiteratordecorator, collection, iterator, list, list, listiterator, listiterator, object, object, predicate, predicatedcollection, predicatedlist, predicatedlist, predicatedlistiterator, util

The Commons Collections PredicatedList.java source code

/*
 *  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 org.apache.commons.collections.list;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.collection.PredicatedCollection;
import org.apache.commons.collections.iterators.AbstractListIteratorDecorator;

/**
 * Decorates another <code>List to validate that all additions
 * match a specified predicate.
 * <p>
 * This list exists to provide validation for the decorated list.
 * It is normally created to decorate an empty list.
 * If an object cannot be added to the list, an IllegalArgumentException is thrown.
 * <p>
 * One usage would be to ensure that no null entries are added to the list.
 * <pre>List list = PredicatedList.decorate(new ArrayList(), NotNullPredicate.INSTANCE);
* <p> * This class is Serializable from Commons Collections 3.1. * * @since Commons Collections 3.0 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $ * * @author Stephen Colebourne * @author Paul Jack */ public class PredicatedList extends PredicatedCollection implements List { /** Serialization version */ private static final long serialVersionUID = -5722039223898659102L; /** * Factory method to create a predicated (validating) list. * <p> * If there are any elements already in the list being decorated, they * are validated. * * @param list the list to decorate, must not be null * @param predicate the predicate to use for validation, must not be null * @throws IllegalArgumentException if list or predicate is null * @throws IllegalArgumentException if the list contains invalid elements */ public static List decorate(List list, Predicate predicate) { return new PredicatedList(list, predicate); } //----------------------------------------------------------------------- /** * Constructor that wraps (not copies). * <p> * If there are any elements already in the list being decorated, they * are validated. * * @param list the list to decorate, must not be null * @param predicate the predicate to use for validation, must not be null * @throws IllegalArgumentException if list or predicate is null * @throws IllegalArgumentException if the list contains invalid elements */ protected PredicatedList(List list, Predicate predicate) { super(list, predicate); } /** * Gets the list being decorated. * * @return the decorated list */ protected List getList() { return (List) getCollection(); } //----------------------------------------------------------------------- public Object get(int index) { return getList().get(index); } public int indexOf(Object object) { return getList().indexOf(object); } public int lastIndexOf(Object object) { return getList().lastIndexOf(object); } public Object remove(int index) { return getList().remove(index); } //----------------------------------------------------------------------- public void add(int index, Object object) { validate(object); getList().add(index, object); } public boolean addAll(int index, Collection coll) { for (Iterator it = coll.iterator(); it.hasNext(); ) { validate(it.next()); } return getList().addAll(index, coll); } public ListIterator listIterator() { return listIterator(0); } public ListIterator listIterator(int i) { return new PredicatedListIterator(getList().listIterator(i)); } public Object set(int index, Object object) { validate(object); return getList().set(index, object); } public List subList(int fromIndex, int toIndex) { List sub = getList().subList(fromIndex, toIndex); return new PredicatedList(sub, predicate); } /** * Inner class Iterator for the PredicatedList */ protected class PredicatedListIterator extends AbstractListIteratorDecorator { protected PredicatedListIterator(ListIterator iterator) { super(iterator); } public void add(Object object) { validate(object); iterator.add(object); } public void set(Object object) { validate(object); iterator.set(object); } } }

Other Commons Collections examples (source code examples)

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