| /* |
| * 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.newplan.logical.relational; |
| |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import org.apache.pig.newplan.Operator; |
| import org.apache.pig.newplan.PlanVisitor; |
| import org.apache.pig.newplan.logical.expression.LogicalExpressionPlan; |
| |
| public class LOLimit extends LogicalRelationalOperator { |
| private static final long serialVersionUID = 2L; |
| private static final long NULL_LIMIT = -1; |
| |
| private long mLimit = NULL_LIMIT; |
| private LogicalExpressionPlan mlimitPlan; |
| |
| public LOLimit(LogicalPlan plan) { |
| super("LOLimit", plan); |
| } |
| |
| public LOLimit(LogicalPlan plan, long limit) { |
| super("LOLimit", plan); |
| this.setLimit(limit); |
| } |
| |
| public LOLimit(LogicalPlan plan, LogicalExpressionPlan limitPlan) { |
| super("LOLimit", plan); |
| this.setLimitPlan(limitPlan); |
| } |
| |
| public long getLimit() { |
| return mLimit; |
| } |
| |
| public void setLimit(long limit) { |
| this.mLimit = limit; |
| } |
| |
| public LogicalExpressionPlan getLimitPlan() { |
| return mlimitPlan; |
| } |
| |
| public void setLimitPlan(LogicalExpressionPlan mlimitPlan) { |
| this.mlimitPlan = mlimitPlan; |
| } |
| |
| @Override |
| public LogicalSchema getSchema() throws FrontendException { |
| if (schema!=null) |
| return schema; |
| |
| LogicalRelationalOperator input = null; |
| input = (LogicalRelationalOperator)plan.getPredecessors(this).get(0); |
| |
| schema = input.getSchema(); |
| return schema; |
| } |
| |
| @Override |
| public void accept(PlanVisitor v) throws FrontendException { |
| if (!(v instanceof LogicalRelationalNodesVisitor)) { |
| throw new FrontendException("Expected LogicalPlanVisitor", 2223); |
| } |
| ((LogicalRelationalNodesVisitor)v).visit(this); |
| } |
| |
| @Override |
| public boolean isEqual(Operator other) throws FrontendException{ |
| if (other != null && other instanceof LOLimit) { |
| LOLimit otherLimit = (LOLimit) other; |
| if (this.getLimit() != NULL_LIMIT && this.getLimit() == otherLimit.getLimit() |
| || this.getLimitPlan() != null && this.getLimitPlan().isEqual(otherLimit.getLimitPlan())) |
| return checkEquality(otherLimit); |
| } |
| return false; |
| } |
| |
| public Operator getInput(LogicalPlan plan) { |
| return plan.getPredecessors(this).get(0); |
| } |
| } |