001    /****************************************************************
002     * Licensed to the Apache Software Foundation (ASF) under one   *
003     * or more contributor license agreements.  See the NOTICE file *
004     * distributed with this work for additional information        *
005     * regarding copyright ownership.  The ASF licenses this file   *
006     * to you under the Apache License, Version 2.0 (the            *
007     * "License"); you may not use this file except in compliance   *
008     * with the License.  You may obtain a copy of the License at   *
009     *                                                              *
010     *   http://www.apache.org/licenses/LICENSE-2.0                 *
011     *                                                              *
012     * Unless required by applicable law or agreed to in writing,   *
013     * software distributed under the License is distributed on an  *
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
015     * KIND, either express or implied.  See the License for the    *
016     * specific language governing permissions and limitations      *
017     * under the License.                                           *
018     ****************************************************************/
019    
020    package org.apache.james.mime4j.codec;
021    
022    import java.util.Iterator;
023    
024    public class ByteQueue implements Iterable<Byte> {
025    
026        private UnboundedFifoByteBuffer buf;
027        private int initialCapacity = -1;
028    
029        public ByteQueue() {
030            buf = new UnboundedFifoByteBuffer();
031        }
032    
033        public ByteQueue(int initialCapacity) {
034            buf = new UnboundedFifoByteBuffer(initialCapacity);
035            this.initialCapacity = initialCapacity;
036        }
037    
038        public void enqueue(byte b) {
039            buf.add(b);
040        }
041    
042        public byte dequeue() {
043            return buf.remove();
044        }
045    
046        public int count() {
047            return buf.size();
048        }
049    
050        public void clear() {
051            if (initialCapacity != -1)
052                buf = new UnboundedFifoByteBuffer(initialCapacity);
053            else
054                buf = new UnboundedFifoByteBuffer();
055        }
056    
057        public Iterator<Byte> iterator() {
058            return buf.iterator();
059        }
060    
061    
062    }