| /* |
| * 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.server.protocol.v1_0.codec; |
| |
| import org.apache.qpid.server.protocol.v1_0.type.Symbol; |
| import org.apache.qpid.bytebuffer.QpidByteBuffer; |
| |
| import java.nio.ByteBuffer; |
| |
| public class SymbolArrayWriter extends VariableWidthWriter<Symbol[]> |
| { |
| |
| private int _length; |
| private byte[] _encodedVal; |
| |
| @Override protected void clearValue() |
| { |
| _encodedVal = null; |
| } |
| |
| @Override protected boolean hasValue() |
| { |
| return _encodedVal != null; |
| } |
| |
| @Override protected byte getFourOctetEncodingCode() |
| { |
| return (byte) 0xf0; |
| } |
| |
| @Override protected byte getSingleOctetEncodingCode() |
| { |
| return (byte) 0xe0; |
| } |
| |
| @Override protected int getLength() |
| { |
| return _length; |
| } |
| |
| @Override protected void writeBytes(final QpidByteBuffer buf, final int offset, final int length) |
| { |
| buf.put(_encodedVal,offset,length); |
| } |
| |
| public boolean isCacheable() |
| { |
| return false; |
| } |
| |
| public void setValue(final Symbol[] value) |
| { |
| |
| boolean useSmallConstructor = useSmallConstructor(value); |
| boolean isSmall = useSmallConstructor && canFitInSmall(value); |
| if(isSmall) |
| { |
| _length = 2; |
| } |
| else |
| { |
| _length = 5; |
| } |
| for(Symbol symbol : value) |
| { |
| _length += symbol.length() ; |
| } |
| _length += value.length * (useSmallConstructor ? 1 : 4); |
| |
| |
| _encodedVal = new byte[_length]; |
| |
| ByteBuffer buf = ByteBuffer.wrap(_encodedVal); |
| if(isSmall) |
| { |
| buf.put((byte)value.length); |
| buf.put(SymbolWriter.SMALL_ENCODING_CODE); |
| } |
| else |
| { |
| buf.putInt(value.length); |
| buf.put(SymbolWriter.LARGE_ENCODING_CODE); |
| } |
| |
| for(Symbol symbol : value) |
| { |
| if(isSmall) |
| { |
| buf.put((byte)symbol.length()); |
| } |
| else |
| { |
| buf.putInt(symbol.length()); |
| } |
| |
| |
| for(int i = 0; i < symbol.length(); i++) |
| { |
| buf.put((byte)symbol.charAt(i)); |
| } |
| } |
| |
| |
| |
| super.setValue(value); |
| } |
| |
| private boolean useSmallConstructor(final Symbol[] value) |
| { |
| for(Symbol sym : value) |
| { |
| if(sym.length()>255) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private boolean canFitInSmall(final Symbol[] value) |
| { |
| if(value.length>=127) |
| { |
| return false; |
| } |
| |
| int remaining = 253 - value.length; |
| for(Symbol symbol : value) |
| { |
| |
| if((remaining -= symbol.length()) < 0) |
| { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| |
| private static Factory<Symbol[]> FACTORY = new Factory<Symbol[]>() |
| { |
| |
| public ValueWriter<Symbol[]> newInstance(Registry registry) |
| { |
| return new SymbolArrayWriter(); |
| } |
| }; |
| |
| public static void register(ValueWriter.Registry registry) |
| { |
| registry.register(Symbol[].class, FACTORY); |
| } |
| } |