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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.util.Iterator;
import ch.boye.httpclientandroidlib.Header;
import ch.boye.httpclientandroidlib.HttpException;
import ch.boye.httpclientandroidlib.HttpMessage;
import ch.boye.httpclientandroidlib.io.HttpMessageWriter;
import ch.boye.httpclientandroidlib.io.SessionOutputBuffer;
import ch.boye.httpclientandroidlib.message.LineFormatter;
import ch.boye.httpclientandroidlib.message.BasicLineFormatter;
import ch.boye.httpclientandroidlib.params.HttpParams;
import ch.boye.httpclientandroidlib.util.CharArrayBuffer;
/**
* Abstract base class for HTTP message writers that serialize output to
* an instance of {@link SessionOutputBuffer}.
*
* @since 4.0
*/
public abstract class AbstractMessageWriter implements HttpMessageWriter {
protected final SessionOutputBuffer sessionBuffer;
protected final CharArrayBuffer lineBuf;
protected final LineFormatter lineFormatter;
/**
* Creates an instance of AbstractMessageWriter.
*
* @param buffer the session output buffer.
* @param formatter the line formatter.
* @param params HTTP parameters.
*/
public AbstractMessageWriter(final SessionOutputBuffer buffer,
final LineFormatter formatter,
final HttpParams params) {
super();
if (buffer == null) {
throw new IllegalArgumentException("Session input buffer may not be null");
}
this.sessionBuffer = buffer;
this.lineBuf = new CharArrayBuffer(128);
this.lineFormatter = (formatter != null) ?
formatter : BasicLineFormatter.DEFAULT;
}
/**
* Subclasses must override this method to write out the first header line
* based on the {@link HttpMessage} passed as a parameter.
*
* @param message the message whose first line is to be written out.
* @throws IOException in case of an I/O error.
*/
protected abstract void writeHeadLine(HttpMessage message) throws IOException;
public void write(
final HttpMessage message) throws IOException, HttpException {
if (message == null) {
throw new IllegalArgumentException("HTTP message may not be null");
}
writeHeadLine(message);
for (Iterator it = message.headerIterator(); it.hasNext(); ) {
Header header = (Header) it.next();
this.sessionBuffer.writeLine
(lineFormatter.formatHeader(this.lineBuf, header));
}
this.lineBuf.clear();
this.sessionBuffer.writeLine(this.lineBuf);
}
}
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