| /** |
| * 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.plan.expr; |
| |
| import com.google.gson.annotations.Expose; |
| import org.apache.tajo.OverridableConf; |
| import org.apache.tajo.annotation.Nullable; |
| import org.apache.tajo.catalog.Schema; |
| import org.apache.tajo.datum.Datum; |
| import org.apache.tajo.datum.DatumFactory; |
| import org.apache.tajo.storage.Tuple; |
| import org.apache.tajo.type.Type; |
| |
| import java.util.TimeZone; |
| |
| public class CastEval extends UnaryEval implements Cloneable { |
| @Expose private Type target; |
| private TimeZone timezone; |
| |
| public CastEval(OverridableConf context, EvalNode operand, Type target) { |
| super(EvalType.CAST, operand); |
| this.target = target; |
| } |
| |
| public EvalNode getOperand() { |
| return child; |
| } |
| |
| @Override |
| public Type getValueType() { |
| return target; |
| } |
| |
| @Override |
| public String getName() { |
| return target.toString(); |
| } |
| |
| @Override |
| public EvalNode bind(@Nullable EvalContext evalContext, Schema schema) { |
| if (evalContext != null) { |
| timezone = evalContext.getTimeZone(); |
| } |
| return super.bind(evalContext, schema); |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public Datum eval(Tuple tuple) { |
| super.eval(tuple); |
| Datum operandDatum = child.eval(tuple); |
| if (operandDatum.isNull()) { |
| return operandDatum; |
| } |
| |
| return DatumFactory.cast(operandDatum, target, timezone); |
| } |
| |
| public String toString() { |
| return "CAST (" + child + " AS " + target + ")"; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = super.hashCode(); |
| result = prime * result + ((target == null) ? 0 : target.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| boolean valid = obj != null && obj instanceof CastEval; |
| if (valid) { |
| CastEval another = (CastEval) obj; |
| boolean b1 = child.equals(another.child); |
| boolean b2 = target.equals(another.target); |
| return b1 && b2; |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public Object clone() throws CloneNotSupportedException { |
| CastEval clone = (CastEval) super.clone(); |
| if (target != null) { |
| clone.target = target; |
| } |
| |
| return clone; |
| } |
| } |