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NullStrategy.java
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NullStrategy.java
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/*
* Copyright © 2014 - 2019 Leipzig University (Database Research Group)
*
* 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.gradoop.common.model.impl.properties.strategies;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputView;
import org.gradoop.common.model.api.strategies.PropertyValueStrategy;
import org.gradoop.common.model.impl.properties.Type;
import java.io.IOException;
/**
* Strategy class for handling {@code PropertyValue} operations when the value is {@code null}.
*/
public class NullStrategy implements PropertyValueStrategy {
@Override
public void write(Object value, DataOutputView outputView) throws IOException {
outputView.write(new byte[]{getRawType()});
}
@Override
public Object read(DataInputView inputView, byte typeByte) throws IOException {
return null;
}
@Override
public int compare(Object value, Object other) {
if (value == null && other == null) {
return 0;
} else if (value == null) {
return -1;
}
return 1;
}
@Override
public boolean is(Object value) {
return false;
}
@Override
public Class<?> getType() {
return null;
}
@Override
public Object get(byte[] bytes) {
return null;
}
@Override
public byte getRawType() {
return Type.NULL.getTypeByte();
}
@Override
public byte[] getRawBytes(Object value) {
return new byte[] {getRawType()};
}
}