Commons Collections example source code file (PredicatedBuffer.java)

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Java - Commons Collections tags/keywords

buffer, buffer, object, object, predicate, predicate, predicatedbuffer, predicatedbuffer, predicatedcollection

The Commons Collections PredicatedBuffer.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.buffer;

import org.apache.commons.collections.Buffer;
import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.collection.PredicatedCollection;

/**
 * Decorates another <code>Buffer to validate that additions
 * match a specified predicate.
 * <p>
 * This buffer exists to provide validation for the decorated buffer.
 * It is normally created to decorate an empty buffer.
 * If an object cannot be added to the buffer, an IllegalArgumentException is thrown.
 * <p>
 * One usage would be to ensure that no null entries are added to the buffer.
 * <pre>Buffer buffer = PredicatedBuffer.decorate(new UnboundedFifoBuffer(), 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 PredicatedBuffer extends PredicatedCollection implements Buffer { /** Serialization version */ private static final long serialVersionUID = 2307609000539943581L; /** * Factory method to create a predicated (validating) buffer. * <p> * If there are any elements already in the buffer being decorated, they * are validated. * * @param buffer the buffer to decorate, must not be null * @param predicate the predicate to use for validation, must not be null * @return a new predicated Buffer * @throws IllegalArgumentException if buffer or predicate is null * @throws IllegalArgumentException if the buffer contains invalid elements */ public static Buffer decorate(Buffer buffer, Predicate predicate) { return new PredicatedBuffer(buffer, predicate); } //----------------------------------------------------------------------- /** * Constructor that wraps (not copies). * <p> * If there are any elements already in the collection being decorated, they * are validated. * * @param buffer the buffer to decorate, must not be null * @param predicate the predicate to use for validation, must not be null * @throws IllegalArgumentException if buffer or predicate is null * @throws IllegalArgumentException if the buffer contains invalid elements */ protected PredicatedBuffer(Buffer buffer, Predicate predicate) { super(buffer, predicate); } /** * Gets the buffer being decorated. * * @return the decorated buffer */ protected Buffer getBuffer() { return (Buffer) getCollection(); } //----------------------------------------------------------------------- public Object get() { return getBuffer().get(); } public Object remove() { return getBuffer().remove(); } }