| /* |
| * 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. |
| */ |
| package org.apache.camel.component.netty.http; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| import io.netty.buffer.ByteBuf; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.StreamCache; |
| import org.apache.camel.util.IOHelper; |
| |
| /** |
| * A {@link ByteBuf} which is exposed as an {@link InputStream} which makes it very |
| * easy to use by Camel and other Camel components. Also supported is {@link StreamCache} |
| * which allows the data to be re-read for example when doing content based routing with XPath. |
| */ |
| public final class NettyChannelBufferStreamCache extends InputStream implements StreamCache { |
| |
| private final ByteBuf buffer; |
| |
| public NettyChannelBufferStreamCache(ByteBuf buffer) { |
| // retain the buffer so we keep it in use until we release it when we are done |
| this.buffer = buffer.retain(); |
| this.buffer.markReaderIndex(); |
| } |
| |
| @Override |
| public boolean markSupported() { |
| return true; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| return buffer.readByte(); |
| } |
| |
| @Override |
| public int read(byte[] b) throws IOException { |
| return read(b, 0, b.length); |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| // are we at end, then return -1 |
| if (buffer.readerIndex() == buffer.capacity()) { |
| return -1; |
| } |
| |
| // ensure we don't read more than what we have in the buffer |
| int before = buffer.readerIndex(); |
| int max = buffer.capacity() - before; |
| len = Math.min(max, len); |
| |
| buffer.readBytes(b, off, len); |
| return buffer.readerIndex() - before; |
| } |
| |
| @Override |
| public void reset() { |
| buffer.resetReaderIndex(); |
| } |
| |
| @Override |
| public void writeTo(OutputStream os) throws IOException { |
| // must remember current index so we can reset back to it after the copy |
| int idx = buffer.readerIndex(); |
| try { |
| buffer.resetReaderIndex(); |
| IOHelper.copy(this, os); |
| } finally { |
| buffer.readerIndex(idx); |
| } |
| } |
| |
| @Override |
| public StreamCache copy(Exchange exchange) throws IOException { |
| return new NettyChannelBufferStreamCache(buffer.copy()); |
| } |
| |
| @Override |
| public boolean inMemory() { |
| return true; |
| } |
| |
| @Override |
| public long length() { |
| return buffer.readableBytes(); |
| } |
| |
| /** |
| * Release the buffer when we are done using it. |
| */ |
| public void release() { |
| buffer.release(); |
| } |
| |
| } |