/**
* 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.tajo.engine.eval;
import com.google.gson.annotations.Expose;
import org.apache.tajo.catalog.Schema;
import org.apache.tajo.common.TajoDataTypes.DataType;
import org.apache.tajo.datum.Datum;
import org.apache.tajo.datum.NumericDatum;
import org.apache.tajo.storage.Tuple;
public class SignedEval extends EvalNode implements Cloneable {
@Expose private EvalNode childEval;
@Expose private boolean negative;
public SignedEval(boolean negative, EvalNode childEval) {
super(EvalType.SIGNED);
this.negative = negative;
this.childEval = childEval;
}
public boolean isNegative() {
return negative;
}
public void setChild(EvalNode child) {
this.childEval = child;
}
public EvalNode getChild() {
return childEval;
}
@Override
public DataType getValueType() {
return childEval.getValueType();
}
@Override
public String getName() {
return "?";
}
@Override
public Datum eval(Schema schema, Tuple tuple) {
NumericDatum result = childEval.eval(schema, tuple);
if (negative) {
return result.inverseSign();
}
return result;
}
@Override
public String toString() {
return (negative ? "-" : "+") + childEval.toString();
}
@Override
public void preOrder(EvalNodeVisitor visitor) {
visitor.visit(this);
childEval.preOrder(visitor);
}
@Override
public void postOrder(EvalNodeVisitor visitor) {
childEval.postOrder(visitor);
visitor.visit(this);
}
@Override
public boolean equals(Object obj) {
if (obj instanceof SignedEval) {
SignedEval other = (SignedEval) obj;
return negative == other.negative && this.childEval.equals(other.childEval);
} else {
return false;
}
}
@Override
public Object clone() throws CloneNotSupportedException {
SignedEval eval = (SignedEval) super.clone();
eval.negative = negative;
eval.childEval = (EvalNode) this.childEval.clone();
return eval;
}
}