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/*
 * ====================================================================
 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */

package org.apache.http.impl.io;

import java.io.IOException;
import java.io.InputStream;

import org.apache.http.io.BufferInfo;
import org.apache.http.io.SessionInputBuffer;
import org.apache.http.util.Args;

/**
 * Input stream that reads data without any transformation. The end of the
 * content entity is demarcated by closing the underlying connection
 * (EOF condition). Entities transferred using this input stream can be of
 * unlimited length.
 * 

* Note that this class NEVER closes the underlying stream, even when close * gets called. Instead, it will read until the end of the stream (until * {@code -1} is returned). * * @since 4.0 */ public class IdentityInputStream extends InputStream { private final SessionInputBuffer in; private boolean closed = false; /** * Wraps session input stream and reads input until the the end of stream. * * @param in The session input buffer */ public IdentityInputStream(final SessionInputBuffer in) { super(); this.in = Args.notNull(in, "Session input buffer"); } @Override public int available() throws IOException { if (this.in instanceof BufferInfo) { return ((BufferInfo) this.in).length(); } return 0; } @Override public void close() throws IOException { this.closed = true; } @Override public int read() throws IOException { return this.closed ? -1 : this.in.read(); } @Override public int read(final byte[] b, final int off, final int len) throws IOException { return this.closed ? -1 : this.in.read(b, off, len); } }





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