    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 <code>InfiniteCircularInputStream</code> has no effect. The methods in
    026 * this class can be called after the stream has been closed without generating
    027 * an <code>IOException</code>.
    028 * </p>
    029 * @since 2.6
    030 */
    031public class InfiniteCircularInputStream extends InputStream {
    032
    033    final private byte[] repeatedContent;
    034    private int position = -1;
    035
    036    /**
    037     * Creates a InfiniteCircularStream from the specified array of chars.
    038     *
    039     * @param repeatedContent
    040     *            Input buffer to be repeated (not copied)
    041     */
    042    public InfiniteCircularInputStream(final byte[] repeatedContent) {
    043        this.repeatedContent = repeatedContent;
    044    }
    045
    046    @Override
    047    public int read() {
    048        position = (position + 1) % repeatedContent.length;
    049        return repeatedContent[position] & 0xff;
    050    }
    051
    052}