| /* |
| * 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.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators; |
| |
| |
| |
| import org.apache.pig.backend.executionengine.ExecException; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.Result; |
| import org.apache.pig.impl.plan.OperatorKey; |
| |
| /** |
| * This is an interface for all comparison operators. Supports the |
| * use of operand type instead of result type as the result type is |
| * always boolean. |
| * |
| */ |
| public interface ComparisonOperator { |
| |
| /** |
| * Determine the type of the operand(s) of this comparator. |
| * @return type, as a byte (using DataType types). |
| */ |
| byte getOperandType(); |
| |
| /** |
| * Set the type of the operand(s) of this comparator. |
| * @param operandType Type of the operand(s), as a byte (using DataType |
| * types). |
| */ |
| void setOperandType(byte operandType); |
| |
| // Stupid java doesn't allow multiple inheritence, so I have to duplicate |
| // all the getNext functions here so that comparitors can have them. |
| public Result getNextInteger() throws ExecException; |
| |
| public Result getNextLong() throws ExecException; |
| |
| public Result getNextDouble() throws ExecException; |
| |
| public Result getNextFloat() throws ExecException; |
| |
| public Result getNextString() throws ExecException; |
| |
| public Result getNextDataByteArray() throws ExecException; |
| |
| public Result getNextMap() throws ExecException; |
| |
| public Result getNextBoolean() throws ExecException; |
| |
| public Result getNextDateTime() throws ExecException; |
| |
| public Result getNextTuple() throws ExecException; |
| |
| public Result getNextDataBag() throws ExecException; |
| |
| } |