/*
* 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.phoenix.expression;
import java.util.List;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.phoenix.query.QueryConstants;
import org.apache.phoenix.schema.PDataType;
import org.apache.phoenix.schema.tuple.Tuple;
/**
*
* Subtract expression implementation
*
*
* @since 0.1
*/
public class LongSubtractExpression extends SubtractExpression {
public LongSubtractExpression() {
}
public LongSubtractExpression(List<Expression> children) {
super(children);
}
@Override
public boolean evaluate(Tuple tuple, ImmutableBytesWritable ptr) {
long finalResult=0;
for(int i=0;i<children.size();i++) {
Expression child = children.get(i);
if (!child.evaluate(tuple, ptr) || ptr.getLength() == 0) {
return false;
}
PDataType childType = child.getDataType();
boolean isDate = childType.isCoercibleTo(PDataType.DATE);
long childvalue = childType.getCodec().decodeLong(ptr, child.getSortOrder());
if (i == 0) {
finalResult = childvalue;
} else {
finalResult -= childvalue;
/*
* Special case for date subtraction - note that only first two expression may be dates.
* We need to convert the date to a unit of "days" because that's what sql expects.
*/
if (isDate) {
finalResult /= QueryConstants.MILLIS_IN_DAY;
}
}
}
byte[] resultPtr=new byte[getDataType().getByteSize()];
getDataType().getCodec().encodeLong(finalResult, resultPtr, 0);
ptr.set(resultPtr);
return true;
}
@Override
public final PDataType getDataType() {
return PDataType.LONG;
}
}