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/*
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 * Licensed to the Apache Software Foundation (ASF) under one
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 * 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
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 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
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 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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package org.apache.http.impl.io;

import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import java.nio.charset.CodingErrorAction;

import org.apache.http.Consts;
import org.apache.http.io.BufferInfo;
import org.apache.http.io.HttpTransportMetrics;
import org.apache.http.io.SessionOutputBuffer;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.Args;
import org.apache.http.util.ByteArrayBuffer;
import org.apache.http.util.CharArrayBuffer;

/**
 * Abstract base class for session output buffers that stream data to
 * an arbitrary {@link OutputStream}. This class buffers small chunks of
 * output data in an internal byte array for optimal output performance.
 * 

* {@link #writeLine(CharArrayBuffer)} and {@link #writeLine(String)} methods * of this class use CR-LF as a line delimiter. * * @since 4.0 * * @deprecated (4.3) use {@link SessionOutputBufferImpl} */ @Deprecated public abstract class AbstractSessionOutputBuffer implements SessionOutputBuffer, BufferInfo { private static final byte[] CRLF = new byte[] {HTTP.CR, HTTP.LF}; private OutputStream outStream; private ByteArrayBuffer buffer; private Charset charset; private boolean ascii; private int minChunkLimit; private HttpTransportMetricsImpl metrics; private CodingErrorAction onMalformedCharAction; private CodingErrorAction onUnmappableCharAction; private CharsetEncoder encoder; private ByteBuffer bbuf; protected AbstractSessionOutputBuffer( final OutputStream outStream, final int bufferSize, final Charset charset, final int minChunkLimit, final CodingErrorAction malformedCharAction, final CodingErrorAction unmappableCharAction) { super(); Args.notNull(outStream, "Input stream"); Args.notNegative(bufferSize, "Buffer size"); this.outStream = outStream; this.buffer = new ByteArrayBuffer(bufferSize); this.charset = charset != null ? charset : Consts.ASCII; this.ascii = this.charset.equals(Consts.ASCII); this.encoder = null; this.minChunkLimit = minChunkLimit >= 0 ? minChunkLimit : 512; this.metrics = createTransportMetrics(); this.onMalformedCharAction = malformedCharAction != null ? malformedCharAction : CodingErrorAction.REPORT; this.onUnmappableCharAction = unmappableCharAction != null? unmappableCharAction : CodingErrorAction.REPORT; } public AbstractSessionOutputBuffer() { } protected void init(final OutputStream outStream, final int bufferSize, final HttpParams params) { Args.notNull(outStream, "Input stream"); Args.notNegative(bufferSize, "Buffer size"); Args.notNull(params, "HTTP parameters"); this.outStream = outStream; this.buffer = new ByteArrayBuffer(bufferSize); final String charset = (String) params.getParameter(CoreProtocolPNames.HTTP_ELEMENT_CHARSET); this.charset = charset != null ? Charset.forName(charset) : Consts.ASCII; this.ascii = this.charset.equals(Consts.ASCII); this.encoder = null; this.minChunkLimit = params.getIntParameter(CoreConnectionPNames.MIN_CHUNK_LIMIT, 512); this.metrics = createTransportMetrics(); final CodingErrorAction a1 = (CodingErrorAction) params.getParameter( CoreProtocolPNames.HTTP_MALFORMED_INPUT_ACTION); this.onMalformedCharAction = a1 != null ? a1 : CodingErrorAction.REPORT; final CodingErrorAction a2 = (CodingErrorAction) params.getParameter( CoreProtocolPNames.HTTP_UNMAPPABLE_INPUT_ACTION); this.onUnmappableCharAction = a2 != null? a2 : CodingErrorAction.REPORT; } /** * @since 4.1 */ protected HttpTransportMetricsImpl createTransportMetrics() { return new HttpTransportMetricsImpl(); } /** * @since 4.1 */ @Override public int capacity() { return this.buffer.capacity(); } /** * @since 4.1 */ @Override public int length() { return this.buffer.length(); } /** * @since 4.1 */ @Override public int available() { return capacity() - length(); } protected void flushBuffer() throws IOException { final int len = this.buffer.length(); if (len > 0) { this.outStream.write(this.buffer.buffer(), 0, len); this.buffer.clear(); this.metrics.incrementBytesTransferred(len); } } @Override public void flush() throws IOException { flushBuffer(); this.outStream.flush(); } @Override public void write(final byte[] b, final int off, final int len) throws IOException { if (b == null) { return; } // Do not want to buffer large-ish chunks // if the byte array is larger then MIN_CHUNK_LIMIT // write it directly to the output stream if (len > this.minChunkLimit || len > this.buffer.capacity()) { // flush the buffer flushBuffer(); // write directly to the out stream this.outStream.write(b, off, len); this.metrics.incrementBytesTransferred(len); } else { // Do not let the buffer grow unnecessarily final int freecapacity = this.buffer.capacity() - this.buffer.length(); if (len > freecapacity) { // flush the buffer flushBuffer(); } // buffer this.buffer.append(b, off, len); } } @Override public void write(final byte[] b) throws IOException { if (b == null) { return; } write(b, 0, b.length); } @Override public void write(final int b) throws IOException { if (this.buffer.isFull()) { flushBuffer(); } this.buffer.append(b); } /** * Writes characters from the specified string followed by a line delimiter * to this session buffer. *

* This method uses CR-LF as a line delimiter. * * @param s the line. * @throws IOException if an I/O error occurs. */ @Override public void writeLine(final String s) throws IOException { if (s == null) { return; } if (s.length() > 0) { if (this.ascii) { for (int i = 0; i < s.length(); i++) { write(s.charAt(i)); } } else { final CharBuffer cbuf = CharBuffer.wrap(s); writeEncoded(cbuf); } } write(CRLF); } /** * Writes characters from the specified char array followed by a line * delimiter to this session buffer. *

* This method uses CR-LF as a line delimiter. * * @param charbuffer the buffer containing chars of the line. * @throws IOException if an I/O error occurs. */ @Override public void writeLine(final CharArrayBuffer charbuffer) throws IOException { if (charbuffer == null) { return; } if (this.ascii) { int off = 0; int remaining = charbuffer.length(); while (remaining > 0) { int chunk = this.buffer.capacity() - this.buffer.length(); chunk = Math.min(chunk, remaining); if (chunk > 0) { this.buffer.append(charbuffer, off, chunk); } if (this.buffer.isFull()) { flushBuffer(); } off += chunk; remaining -= chunk; } } else { final CharBuffer cbuf = CharBuffer.wrap(charbuffer.buffer(), 0, charbuffer.length()); writeEncoded(cbuf); } write(CRLF); } private void writeEncoded(final CharBuffer cbuf) throws IOException { if (!cbuf.hasRemaining()) { return; } if (this.encoder == null) { this.encoder = this.charset.newEncoder(); this.encoder.onMalformedInput(this.onMalformedCharAction); this.encoder.onUnmappableCharacter(this.onUnmappableCharAction); } if (this.bbuf == null) { this.bbuf = ByteBuffer.allocate(1024); } this.encoder.reset(); while (cbuf.hasRemaining()) { final CoderResult result = this.encoder.encode(cbuf, this.bbuf, true); handleEncodingResult(result); } final CoderResult result = this.encoder.flush(this.bbuf); handleEncodingResult(result); this.bbuf.clear(); } private void handleEncodingResult(final CoderResult result) throws IOException { if (result.isError()) { result.throwException(); } this.bbuf.flip(); while (this.bbuf.hasRemaining()) { write(this.bbuf.get()); } this.bbuf.compact(); } @Override public HttpTransportMetrics getMetrics() { return this.metrics; } }





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