/*
* ====================================================================
* 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
* <http://www.apache.org/>.
*
*/
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.
* <p>
* 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();
} else {
return 0;
}
}
@
Override
public void
close() throws
IOException {
this.
closed = true;
}
@
Override
public int
read() throws
IOException {
if (this.
closed) {
return -1;
} else {
return this.
in.
read();
}
}
@
Override
public int
read(final byte[]
b, final int
off, final int
len) throws
IOException {
if (this.
closed) {
return -1;
} else {
return this.
in.
read(
b,
off,
len);
}
}
}