| /* |
| * 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.qpid.proton.codec.transport; |
| |
| import java.util.Collection; |
| |
| import org.apache.qpid.proton.amqp.Symbol; |
| import org.apache.qpid.proton.amqp.UnsignedLong; |
| import org.apache.qpid.proton.amqp.messaging.Accepted; |
| import org.apache.qpid.proton.amqp.messaging.Released; |
| import org.apache.qpid.proton.amqp.transport.DeliveryState; |
| import org.apache.qpid.proton.amqp.transport.Disposition; |
| import org.apache.qpid.proton.amqp.transport.Role; |
| import org.apache.qpid.proton.codec.AMQPType; |
| import org.apache.qpid.proton.codec.DecodeException; |
| import org.apache.qpid.proton.codec.Decoder; |
| import org.apache.qpid.proton.codec.DecoderImpl; |
| import org.apache.qpid.proton.codec.EncoderImpl; |
| import org.apache.qpid.proton.codec.EncodingCodes; |
| import org.apache.qpid.proton.codec.FastPathDescribedTypeConstructor; |
| import org.apache.qpid.proton.codec.TypeEncoding; |
| import org.apache.qpid.proton.codec.WritableBuffer; |
| |
| public class FastPathDispositionType implements AMQPType<Disposition>, FastPathDescribedTypeConstructor<Disposition> { |
| |
| private static final byte DESCRIPTOR_CODE = 0x15; |
| private static final byte ACCEPTED_DESCRIPTOR_CODE = 0x24; |
| |
| private static final Object[] DESCRIPTORS = |
| { |
| UnsignedLong.valueOf(DESCRIPTOR_CODE), Symbol.valueOf("amqp:disposition:list"), |
| }; |
| |
| private static final byte[] ACCEPTED_ENCODED_BYTES = new byte[] { |
| EncodingCodes.DESCRIBED_TYPE_INDICATOR, |
| EncodingCodes.SMALLULONG, |
| ACCEPTED_DESCRIPTOR_CODE, |
| EncodingCodes.LIST0 |
| }; |
| |
| private final DispositionType dispositionType; |
| |
| public FastPathDispositionType(EncoderImpl encoder) { |
| this.dispositionType = new DispositionType(encoder); |
| } |
| |
| public EncoderImpl getEncoder() { |
| return dispositionType.getEncoder(); |
| } |
| |
| public DecoderImpl getDecoder() { |
| return dispositionType.getDecoder(); |
| } |
| |
| @Override |
| public boolean encodesJavaPrimitive() { |
| return false; |
| } |
| |
| @Override |
| public Class<Disposition> getTypeClass() { |
| return Disposition.class; |
| } |
| |
| @Override |
| public TypeEncoding<Disposition> getEncoding(Disposition disposition) { |
| return dispositionType.getEncoding(disposition); |
| } |
| |
| @Override |
| public TypeEncoding<Disposition> getCanonicalEncoding() { |
| return dispositionType.getCanonicalEncoding(); |
| } |
| |
| @Override |
| public Collection<? extends TypeEncoding<Disposition>> getAllEncodings() { |
| return dispositionType.getAllEncodings(); |
| } |
| |
| @Override |
| public Disposition readValue() { |
| DecoderImpl decoder = getDecoder(); |
| byte typeCode = decoder.getBuffer().get(); |
| |
| @SuppressWarnings("unused") |
| int size = 0; |
| int count = 0; |
| |
| switch (typeCode) { |
| case EncodingCodes.LIST0: |
| // TODO - Technically invalid however old decoder also allowed this. |
| break; |
| case EncodingCodes.LIST8: |
| size = ((int)decoder.getBuffer().get()) & 0xff; |
| count = ((int)decoder.getBuffer().get()) & 0xff; |
| break; |
| case EncodingCodes.LIST32: |
| size = decoder.getBuffer().getInt(); |
| count = decoder.getBuffer().getInt(); |
| break; |
| default: |
| throw new DecodeException("Incorrect type found in Disposition encoding: " + typeCode); |
| } |
| |
| Disposition disposition = new Disposition(); |
| |
| for (int index = 0; index < count; ++index) { |
| switch (index) { |
| case 0: |
| disposition.setRole(Boolean.TRUE.equals(decoder.readBoolean()) ? Role.RECEIVER : Role.SENDER); |
| break; |
| case 1: |
| disposition.setFirst(decoder.readUnsignedInteger(null)); |
| break; |
| case 2: |
| disposition.setLast(decoder.readUnsignedInteger(null)); |
| break; |
| case 3: |
| disposition.setSettled(decoder.readBoolean(false)); |
| break; |
| case 4: |
| disposition.setState((DeliveryState) decoder.readObject()); |
| break; |
| case 5: |
| disposition.setBatchable(decoder.readBoolean(false)); |
| break; |
| default: |
| throw new IllegalStateException("To many entries in Disposition encoding"); |
| } |
| } |
| |
| return disposition; |
| } |
| |
| @Override |
| public void skipValue() { |
| getDecoder().readConstructor().skipValue(); |
| } |
| |
| @Override |
| public void write(Disposition disposition) { |
| WritableBuffer buffer = getEncoder().getBuffer(); |
| int count = getElementCount(disposition); |
| byte encodingCode = deduceEncodingCode(disposition, count); |
| |
| buffer.put(EncodingCodes.DESCRIBED_TYPE_INDICATOR); |
| buffer.put(EncodingCodes.SMALLULONG); |
| buffer.put(DESCRIPTOR_CODE); |
| buffer.put(encodingCode); |
| |
| final int fieldWidth; |
| |
| if (encodingCode == EncodingCodes.LIST8) { |
| fieldWidth = 1; |
| } else { |
| fieldWidth = 4; |
| } |
| |
| int startIndex = buffer.position(); |
| |
| // Reserve space for the size and write the count of list elements. |
| if (fieldWidth == 1) { |
| buffer.put((byte) 0); |
| buffer.put((byte) count); |
| } else { |
| buffer.putInt(0); |
| buffer.putInt(count); |
| } |
| |
| // Write the list elements and then compute total size written. |
| for (int i = 0; i < count; ++i) { |
| writeElement(disposition, i); |
| } |
| |
| // Move back and write the size |
| int endIndex = buffer.position(); |
| int writeSize = endIndex - startIndex - fieldWidth; |
| |
| buffer.position(startIndex); |
| if (fieldWidth == 1) { |
| buffer.put((byte) writeSize); |
| } else { |
| buffer.putInt(writeSize); |
| } |
| buffer.position(endIndex); |
| } |
| |
| private void writeElement(Disposition disposition, int index) { |
| switch (index) { |
| case 0: |
| getEncoder().writeBoolean(disposition.getRole().getValue()); |
| break; |
| case 1: |
| getEncoder().writeUnsignedInteger(disposition.getFirst()); |
| break; |
| case 2: |
| getEncoder().writeUnsignedInteger(disposition.getLast()); |
| break; |
| case 3: |
| getEncoder().writeBoolean(disposition.getSettled()); |
| break; |
| case 4: |
| if (Accepted.getInstance().equals(disposition.getState())) { |
| getEncoder().getBuffer().put(ACCEPTED_ENCODED_BYTES, 0, ACCEPTED_ENCODED_BYTES.length); |
| } else { |
| getEncoder().writeObject(disposition.getState()); |
| } |
| break; |
| case 5: |
| getEncoder().writeBoolean(disposition.getBatchable()); |
| break; |
| default: |
| throw new IllegalArgumentException("Unknown Disposition value index: " + index); |
| } |
| } |
| |
| private int getElementCount(Disposition disposition) { |
| if (disposition.getBatchable()) { |
| return 6; |
| } else if (disposition.getState() != null) { |
| return 5; |
| } else if (disposition.getSettled()) { |
| return 4; |
| } else if (disposition.getLast() != null) { |
| return 3; |
| } else { |
| return 2; |
| } |
| } |
| |
| private byte deduceEncodingCode(Disposition value, int elementCount) { |
| if (value.getState() == null) { |
| return EncodingCodes.LIST8; |
| } else if (value.getState() == Accepted.getInstance() || value.getState() == Released.getInstance()) { |
| return EncodingCodes.LIST8; |
| } else { |
| return EncodingCodes.LIST32; |
| } |
| } |
| |
| public static void register(Decoder decoder, EncoderImpl encoder) { |
| FastPathDispositionType type = new FastPathDispositionType(encoder); |
| for(Object descriptor : DESCRIPTORS) { |
| decoder.register(descriptor, (FastPathDescribedTypeConstructor<?>) type); |
| } |
| encoder.register(type); |
| } |
| } |