001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.io.input; 018 019import java.io.InputStream; 020 021/** 022 * 023 * An {@link InputStream} that infinitely repeats provided bytes. 024 * <p> 025 * Closing a <tt>InfiniteCircularInputStream</tt> has no effect. The methods in 026 * this class can be called after the stream has been closed without generating 027 * an <tt>IOException</tt>. 028 * 029 */ 030public class InfiniteCircularInputStream extends InputStream { 031 032 final private byte[] repeatedContent; 033 private int position = -1; 034 035 /** 036 * Creates a InfiniteCircularStream from the specified array of chars. 037 * 038 * @param repeatedContent 039 * Input buffer to be repeated (not copied) 040 */ 041 public InfiniteCircularInputStream(final byte[] repeatedContent) { 042 this.repeatedContent = repeatedContent; 043 } 044 045 @Override 046 public int read() { 047 position = (position + 1) % repeatedContent.length; 048 return repeatedContent[position] & 0xff; // copied from 049 // java.io.ByteArrayInputStream.read() 050 } 051 052}