/**
* Copyright 2007-2015, Kaazing Corporation. All rights reserved.
*
* Licensed 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.kaazing.k3po.driver.internal.behavior.handler.codec;
import static org.jboss.netty.buffer.ChannelBuffers.copiedBuffer;
import static org.kaazing.k3po.lang.internal.RegionInfo.newSequential;
import org.jboss.netty.buffer.ChannelBuffer;
import org.kaazing.k3po.driver.internal.behavior.ScriptProgressException;
import org.kaazing.k3po.driver.internal.util.Utils;
import org.kaazing.k3po.lang.internal.RegionInfo;
public class ReadExactBytesDecoder extends MessageDecoder {
private final ChannelBuffer expected;
public ReadExactBytesDecoder(RegionInfo regionInfo, byte[] expected) {
super(regionInfo);
this.expected = copiedBuffer(expected);
}
@Override
protected Object decodeBuffer(ChannelBuffer buffer) throws Exception {
if (buffer.readableBytes() < expected.readableBytes()) {
return null;
}
ChannelBuffer observed = buffer.readSlice(expected.readableBytes());
if (!observed.equals(expected)) {
throw new ScriptProgressException(getRegionInfo(), Utils.format(observed));
}
return buffer;
}
@Override
public String toString() {
return Utils.format(expected.array());
}
// unit tests
ReadExactBytesDecoder(byte[] expected) {
this(newSequential(0, 0), expected);
}
}