/*
* Copyright 2011 Outerthought bvba
*
* 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.lilyproject.repository.impl.valuetype;
import java.util.Comparator;
import org.apache.hadoop.hbase.util.Bytes;
import org.lilyproject.bytes.api.ByteArray;
import org.lilyproject.bytes.api.DataInput;
import org.lilyproject.bytes.api.DataOutput;
import org.lilyproject.repository.api.IdentityRecordStack;
import org.lilyproject.repository.api.ValueType;
import org.lilyproject.repository.api.ValueTypeFactory;
/**
* The ByteArrayValueType allows to use byte arrays (byte[]) as field values.
* <p>
* To avoid issues with changing byte[] values while they are used in a field,
* we require them to be wrapped in a read only {@link ByteArray} object.
*/
public class ByteArrayValueType extends AbstractValueType implements ValueType {
public final static String NAME = "BYTEARRAY";
private static final Comparator<ByteArray> COMPARATOR = new Comparator<ByteArray>() {
@Override
public int compare(ByteArray o1, ByteArray o2) {
return Bytes.compareTo(o1.getBytesUnsafe(), o2.getBytesUnsafe());
}
};
@Override
public String getBaseName() {
return NAME;
}
@Override
public ValueType getDeepestValueType() {
return this;
}
@Override
@SuppressWarnings("unchecked")
public ByteArray read(DataInput dataInput) {
int length = dataInput.readInt();
// We can use ByteArray.wrap here since in this use case the dataInput
// will always be a DataInputImpl which copies the bytes when reading
// them.
return ByteArray.wrap(dataInput.readBytes(length));
}
@Override
public void write(Object value, DataOutput dataOutput, IdentityRecordStack parentRecords) {
ByteArray byteArray = (ByteArray) value;
dataOutput.writeInt(byteArray.length());
// We can use getBytesUnsafe here since we know that in this use case
// the
// dataOutput will be a DataOutputImpl which copies the byte[] when
// writing it.
dataOutput.writeBytes(byteArray.getBytesUnsafe());
}
@Override
public Class getType() {
return ByteArray.class;
}
@Override
public Comparator getComparator() {
return COMPARATOR;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + NAME.hashCode();
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
return true;
}
//
// Factory
//
public static ValueTypeFactory factory() {
return new ByteArrayValueTypeFactory();
}
public static class ByteArrayValueTypeFactory implements ValueTypeFactory {
private static ByteArrayValueType instance = new ByteArrayValueType();
@Override
public ValueType getValueType(String typeParams) {
return instance;
}
}
}