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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
* <http://www.apache.org/>.
*
*/
package ch.boye.httpclientandroidlib.impl.io;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.Socket;
import ch.boye.httpclientandroidlib.io.EofSensor;
import ch.boye.httpclientandroidlib.io.SessionInputBuffer;
import ch.boye.httpclientandroidlib.params.HttpParams;
/**
* {@link SessionInputBuffer} implementation bound to a {@link Socket}.
* <p>
* The following parameters can be used to customize the behavior of this
* class:
* <ul>
* <li>{@link ch.boye.httpclientandroidlib.params.CoreProtocolPNames#HTTP_ELEMENT_CHARSET}</li>
* <li>{@link ch.boye.httpclientandroidlib.params.CoreConnectionPNames#MAX_LINE_LENGTH}</li>
* </ul>
*
* @since 4.0
*/
public class SocketInputBuffer extends AbstractSessionInputBuffer implements EofSensor {
static private final Class SOCKET_TIMEOUT_CLASS = SocketTimeoutExceptionClass();
/**
* Returns <code>SocketTimeoutExceptionClass<code> or <code>null</code> if the class
* does not exist.
*
* @return <code>SocketTimeoutExceptionClass<code>, or <code>null</code> if unavailable.
*/
static private Class SocketTimeoutExceptionClass() {
try {
return Class.forName("java.net.SocketTimeoutException");
} catch (ClassNotFoundException e) {
return null;
}
}
private static boolean isSocketTimeoutException(final InterruptedIOException e) {
if (SOCKET_TIMEOUT_CLASS != null) {
return SOCKET_TIMEOUT_CLASS.isInstance(e);
} else {
return true;
}
}
private final Socket socket;
private boolean eof;
/**
* Creates an instance of this class.
*
* @param socket the socket to read data from.
* @param buffersize the size of the internal buffer. If this number is less
* than <code>0</code> it is set to the value of
* {@link Socket#getReceiveBufferSize()}. If resultant number is less
* than <code>1024</code> it is set to <code>1024</code>.
* @param params HTTP parameters.
*/
public SocketInputBuffer(
final Socket socket,
int buffersize,
final HttpParams params) throws IOException {
super();
if (socket == null) {
throw new IllegalArgumentException("Socket may not be null");
}
this.socket = socket;
this.eof = false;
if (buffersize < 0) {
buffersize = socket.getReceiveBufferSize();
}
if (buffersize < 1024) {
buffersize = 1024;
}
init(socket.getInputStream(), buffersize, params);
}
protected int fillBuffer() throws IOException {
int i = super.fillBuffer();
this.eof = i == -1;
return i;
}
public boolean isDataAvailable(int timeout) throws IOException {
boolean result = hasBufferedData();
if (!result) {
int oldtimeout = this.socket.getSoTimeout();
try {
this.socket.setSoTimeout(timeout);
fillBuffer();
result = hasBufferedData();
} catch (InterruptedIOException e) {
if (!isSocketTimeoutException(e)) {
throw e;
}
} finally {
socket.setSoTimeout(oldtimeout);
}
}
return result;
}
public boolean isEof() {
return this.eof;
}
}
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