| /* |
| * 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.drill.common.expression; |
| |
| import java.util.Collections; |
| import java.util.Iterator; |
| |
| import org.apache.drill.common.expression.visitors.ExprVisitor; |
| import org.apache.drill.common.types.TypeProtos.MajorType; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| public class CastExpression extends LogicalExpressionBase implements Iterable<LogicalExpression>{ |
| |
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(CastExpression.class); |
| |
| private final LogicalExpression input; |
| private final MajorType type; |
| |
| public CastExpression(LogicalExpression input, MajorType type, ExpressionPosition pos) { |
| super(pos); |
| this.input = input; |
| this.type = checkNotNull(type, "Major type cannot be null"); |
| } |
| |
| @Override |
| public <T, V, E extends Exception> T accept(ExprVisitor<T, V, E> visitor, V value) throws E { |
| return visitor.visitCastExpression(this, value); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null) { |
| return false; |
| } |
| if (!(obj instanceof CastExpression)) { |
| return false; |
| } |
| |
| CastExpression other = (CastExpression) obj; |
| |
| return this.input.equals(other.input) && (this.getMajorType().hasMinorType() == other.getMajorType().hasMinorType()); |
| } |
| |
| @Override |
| public int hashCode() { |
| //for now we ignore type's other attributes |
| return (input.hashCode() << 8) + (0x00ff & type.getMinorType().getNumber()); |
| } |
| |
| @Override |
| public Iterator<LogicalExpression> iterator() { |
| return Collections.singleton(input).iterator(); |
| } |
| |
| public LogicalExpression getInput() { |
| return input; |
| } |
| |
| @Override |
| public MajorType getMajorType() { |
| return type; |
| } |
| |
| @Override |
| public String toString() { |
| return "CastExpression [input=" + input + ", type=" + type + "]"; |
| } |
| |
| |
| |
| } |