| /* |
| * ==================================================================== |
| * 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.nio.client.methods; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.CharBuffer; |
| import java.nio.charset.Charset; |
| import java.nio.charset.CharsetDecoder; |
| import java.nio.charset.CoderResult; |
| |
| import org.apache.http.HttpEntity; |
| import org.apache.http.entity.ContentType; |
| import org.apache.http.nio.ContentDecoder; |
| import org.apache.http.nio.IOControl; |
| import org.apache.http.nio.protocol.AbstractAsyncResponseConsumer; |
| import org.apache.http.protocol.HTTP; |
| import org.apache.http.util.Asserts; |
| |
| /** |
| * {@link org.apache.http.nio.protocol.HttpAsyncResponseConsumer} implementation that |
| * provides convenience methods for processing of textual content entities enclosed |
| * in an HTTP response. |
| * |
| * @since 4.0 |
| */ |
| public abstract class AsyncCharConsumer<T> extends AbstractAsyncResponseConsumer<T> { |
| |
| private final ByteBuffer bbuf; |
| private final CharBuffer cbuf; |
| |
| private CharsetDecoder chardecoder; |
| |
| public AsyncCharConsumer(final int bufSize) { |
| super(); |
| this.bbuf = ByteBuffer.allocate(bufSize); |
| this.cbuf = CharBuffer.allocate(bufSize); |
| } |
| |
| public AsyncCharConsumer() { |
| this(8 * 1024); |
| } |
| |
| /** |
| * Invoked to process a {@link CharBuffer chunk} of content. |
| * The {@link IOControl} interface can be used to suspend input events |
| * if the consumer is temporarily unable to consume more content. |
| * |
| * @param buf chunk of content. |
| * @param ioctrl I/O control of the underlying connection. |
| * @throws IOException in case of an I/O error |
| */ |
| protected abstract void onCharReceived( |
| CharBuffer buf, IOControl ioctrl) throws IOException; |
| |
| /** |
| * Invoked to create a @{link CharsetDecoder} for contentType. |
| * This allows to use different default charsets for different content |
| * types and set appropriate coding error actions. |
| * |
| * @param contentType response Content-Type or null if not specified. |
| * @return content decoder. |
| * |
| * @since 4.1 |
| */ |
| protected CharsetDecoder createDecoder(final ContentType contentType) { |
| Charset charset = contentType != null ? contentType.getCharset() : null; |
| if (charset == null) { |
| charset = HTTP.DEF_CONTENT_CHARSET; |
| } |
| return charset.newDecoder(); |
| } |
| |
| @Override |
| protected final void onEntityEnclosed( |
| final HttpEntity entity, final ContentType contentType) throws IOException { |
| this.chardecoder = createDecoder(contentType != null ? contentType : ContentType.DEFAULT_TEXT); |
| } |
| |
| @Override |
| protected final void onContentReceived( |
| final ContentDecoder decoder, final IOControl ioctrl) throws IOException { |
| Asserts.notNull(this.bbuf, "Byte buffer"); |
| |
| final int bytesRead = decoder.read(this.bbuf); |
| if (bytesRead <= 0) { |
| return; |
| } |
| this.bbuf.flip(); |
| final boolean completed = decoder.isCompleted(); |
| CoderResult result = this.chardecoder.decode(this.bbuf, this.cbuf, completed); |
| handleDecodingResult(result, ioctrl); |
| this.bbuf.compact(); |
| if (completed) { |
| result = this.chardecoder.flush(this.cbuf); |
| handleDecodingResult(result, ioctrl); |
| } |
| } |
| |
| private void handleDecodingResult( |
| final CoderResult result, final IOControl ioctrl) throws IOException { |
| if (result.isError()) { |
| result.throwException(); |
| } |
| this.cbuf.flip(); |
| if (this.cbuf.hasRemaining()) { |
| onCharReceived(this.cbuf, ioctrl); |
| } |
| this.cbuf.clear(); |
| } |
| |
| @Override |
| protected void releaseResources() { |
| } |
| |
| } |