/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.api.java.typeutils.runtime.record;
import java.io.IOException;
import eu.stratosphere.api.common.typeutils.TypeSerializer;
import eu.stratosphere.core.memory.DataInputView;
import eu.stratosphere.core.memory.DataOutputView;
import eu.stratosphere.types.Record;
/**
* Implementation of the (de)serialization and copying logic for the {@link Record}.
*/
public final class RecordSerializer extends TypeSerializer<Record> {
private static final long serialVersionUID = 1L;
private static final RecordSerializer INSTANCE = new RecordSerializer(); // singleton instance
private static final int MAX_BIT = 0x80; // byte where only the most significant bit is set
// --------------------------------------------------------------------------------------------
public static final RecordSerializer get() {
return INSTANCE;
}
/**
* Creates a new instance of the RecordSerializers. Private to prevent instantiation.
*/
private RecordSerializer() {}
// --------------------------------------------------------------------------------------------
@Override
public boolean isImmutableType() {
return false;
}
@Override
public boolean isStateful() {
return false;
}
@Override
public Record createInstance() {
return new Record();
}
@Override
public Record copy(Record from, Record reuse) {
from.copyTo(reuse);
return reuse;
}
@Override
public int getLength() {
return -1;
}
// --------------------------------------------------------------------------------------------
@Override
public void serialize(Record record, DataOutputView target) throws IOException {
record.serialize(target);
}
@Override
public Record deserialize(Record target, DataInputView source) throws IOException {
target.deserialize(source);
return target;
}
@Override
public void copy(DataInputView source, DataOutputView target) throws IOException {
int val = source.readUnsignedByte();
target.writeByte(val);
if (val >= MAX_BIT) {
int shift = 7;
int curr;
val = val & 0x7f;
while ((curr = source.readUnsignedByte()) >= MAX_BIT) {
target.writeByte(curr);
val |= (curr & 0x7f) << shift;
shift += 7;
}
target.writeByte(curr);
val |= curr << shift;
}
target.write(source, val);
}
}