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.IOException; 020import java.io.InputStream; 021 022/** 023 * This is an alternative to {@link java.io.ByteArrayInputStream} 024 * which removes the synchronization overhead for non-concurrent 025 * access; as such this class is not thread-safe. 026 * 027 * Proxy stream that prevents the underlying input stream from being marked/reset. 028 * <p> 029 * This class is typically used in cases where an input stream that supports 030 * marking needs to be passed to a component that wants to explicitly mark 031 * the stream, but it is not desirable to allow marking of the stream. 032 * </p> 033 * 034 * @since 2.8.0 035 */ 036public class MarkShieldInputStream extends ProxyInputStream { 037 038 /** 039 * Constructs a proxy that shields the given input stream from being 040 * marked or rest. 041 * 042 * @param in underlying input stream 043 */ 044 public MarkShieldInputStream(final InputStream in) { 045 super(in); 046 } 047 048 @SuppressWarnings("sync-override") 049 @Override 050 public void mark(final int readLimit) { 051 // no-op 052 } 053 054 @Override 055 public boolean markSupported() { 056 return false; 057 } 058 059 @SuppressWarnings("sync-override") 060 @Override 061 public void reset() throws IOException { 062 throw UnsupportedOperationExceptions.reset(); 063 } 064}