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The RabbitMQ Java client library allows Java applications to interface with RabbitMQ.
// The contents of this file are subject to the Mozilla Public License
// Version 1.1 (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.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
// the License for the specific language governing rights and
// limitations under the License.
//
// The Original Code is RabbitMQ.
//
// The Initial Developer of the Original Code is GoPivotal, Inc.
// Copyright (c) 2007-2013 GoPivotal, Inc. All rights reserved.
//
package com.rabbitmq.client.impl;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.Date;
import java.util.Map;
import com.rabbitmq.client.ContentHeader;
import com.rabbitmq.client.LongString;
/**
* Parses an AMQP wire-protocol {@link ContentHeader} from a
* DataInputStream. Methods on this object are usually called from
* autogenerated code.
*/
public class ContentHeaderPropertyReader {
/** Stream we are reading from */
private final ValueReader in;
/** Current field flag word */
public int flagWord;
/** Current flag position counter */
public int bitCount;
/**
* Protected API - Constructs a reader from the given input stream
*/
public ContentHeaderPropertyReader(DataInputStream in) throws IOException {
this.in = new ValueReader(in);
this.flagWord = 1; // just the continuation bit
this.bitCount = 15; // forces a flagWord read
}
private boolean isContinuationBitSet() {
return (flagWord & 1) != 0;
}
public void readFlagWord() throws IOException {
if (!isContinuationBitSet()) {
// FIXME: Proper exception class!
throw new IOException("Attempted to read flag word when none advertised");
}
flagWord = in.readShort();
bitCount = 0;
}
public boolean readPresence() throws IOException {
if (bitCount == 15) {
readFlagWord();
}
int bit = 15 - bitCount;
bitCount++;
return (flagWord & (1 << bit)) != 0;
}
public void finishPresence() throws IOException {
if (isContinuationBitSet()) {
// FIXME: Proper exception class!
throw new IOException("Unexpected continuation flag word");
}
}
/** Reads and returns an AMQP short string content header field. */
public String readShortstr() throws IOException {
return in.readShortstr();
}
/** Reads and returns an AMQP "long string" (binary) content header field. */
public LongString readLongstr() throws IOException {
return in.readLongstr();
}
/** Reads and returns an AMQP short integer content header field. */
public Integer readShort() throws IOException {
return in.readShort();
}
/** Reads and returns an AMQP integer content header field. */
public Integer readLong() throws IOException {
return in.readLong();
}
/** Reads and returns an AMQP long integer content header field. */
public Long readLonglong() throws IOException {
return in.readLonglong();
}
/** Reads and returns an AMQP table content header field. */
public Map readTable() throws IOException {
return in.readTable();
}
/** Reads and returns an AMQP octet content header field. */
public int readOctet() throws IOException {
return in.readOctet();
}
/** Reads and returns an AMQP timestamp content header field. */
public Date readTimestamp() throws IOException {
return in.readTimestamp();
}
}