michael@0: /*
michael@0:  * ====================================================================
michael@0:  * Licensed to the Apache Software Foundation (ASF) under one
michael@0:  * or more contributor license agreements.  See the NOTICE file
michael@0:  * distributed with this work for additional information
michael@0:  * regarding copyright ownership.  The ASF licenses this file
michael@0:  * to you under the Apache License, Version 2.0 (the
michael@0:  * "License"); you may not use this file except in compliance
michael@0:  * with the License.  You may obtain a copy of the License at
michael@0:  *
michael@0:  *   http://www.apache.org/licenses/LICENSE-2.0
michael@0:  *
michael@0:  * Unless required by applicable law or agreed to in writing,
michael@0:  * software distributed under the License is distributed on an
michael@0:  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
michael@0:  * KIND, either express or implied.  See the License for the
michael@0:  * specific language governing permissions and limitations
michael@0:  * under the License.
michael@0:  * ====================================================================
michael@0:  *
michael@0:  * This software consists of voluntary contributions made by many
michael@0:  * individuals on behalf of the Apache Software Foundation.  For more
michael@0:  * information on the Apache Software Foundation, please see
michael@0:  * <http://www.apache.org/>.
michael@0:  *
michael@0:  */
michael@0: 
michael@0: package ch.boye.httpclientandroidlib.impl.io;
michael@0: 
michael@0: import java.io.IOException;
michael@0: import java.io.InputStream;
michael@0: 
michael@0: import ch.boye.httpclientandroidlib.io.BufferInfo;
michael@0: import ch.boye.httpclientandroidlib.io.SessionInputBuffer;
michael@0: 
michael@0: /**
michael@0:  * Input stream that reads data without any transformation. The end of the
michael@0:  * content entity is demarcated by closing the underlying connection
michael@0:  * (EOF condition). Entities transferred using this input stream can be of
michael@0:  * unlimited length.
michael@0:  * <p>
michael@0:  * Note that this class NEVER closes the underlying stream, even when close
michael@0:  * gets called.  Instead, it will read until the end of the stream (until
michael@0:  * <code>-1</code> is returned).
michael@0:  *
michael@0:  * @since 4.0
michael@0:  */
michael@0: public class IdentityInputStream extends InputStream {
michael@0: 
michael@0:     private final SessionInputBuffer in;
michael@0: 
michael@0:     private boolean closed = false;
michael@0: 
michael@0:     /**
michael@0:      * Wraps session input stream and reads input until the the end of stream.
michael@0:      *
michael@0:      * @param in The session input buffer
michael@0:      */
michael@0:     public IdentityInputStream(final SessionInputBuffer in) {
michael@0:         super();
michael@0:         if (in == null) {
michael@0:             throw new IllegalArgumentException("Session input buffer may not be null");
michael@0:         }
michael@0:         this.in = in;
michael@0:     }
michael@0: 
michael@0:     public int available() throws IOException {
michael@0:         if (this.in instanceof BufferInfo) {
michael@0:             return ((BufferInfo) this.in).length();
michael@0:         } else {
michael@0:             return 0;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     public void close() throws IOException {
michael@0:         this.closed = true;
michael@0:     }
michael@0: 
michael@0:     public int read() throws IOException {
michael@0:         if (this.closed) {
michael@0:             return -1;
michael@0:         } else {
michael@0:             return this.in.read();
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     public int read(final byte[] b, int off, int len) throws IOException {
michael@0:         if (this.closed) {
michael@0:             return -1;
michael@0:         } else {
michael@0:             return this.in.read(b, off, len);
michael@0:         }
michael@0:     }
michael@0: 
michael@0: }