/*
* 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.expression;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.newplan.BaseOperatorPlan;
import org.apache.pig.newplan.Operator;
import org.apache.pig.newplan.OperatorPlan;
import org.apache.pig.newplan.logical.optimizer.LogicalPlanPrinter;
/**
* A plan containing LogicalExpressionOperators.
*/
public class LogicalExpressionPlan extends BaseOperatorPlan {
@Override
public boolean isEqual(OperatorPlan other) throws FrontendException {
if (other != null && other instanceof LogicalExpressionPlan) {
LogicalExpressionPlan otherPlan = (LogicalExpressionPlan)other;
List<Operator> roots = getSources();
List<Operator> otherRoots = otherPlan.getSources();
if (roots.size() == 0 && otherRoots.size() == 0) return true;
if (roots.size() > 1 || otherRoots.size() > 1) {
throw new FrontendException("Found LogicalExpressionPlan with more than one root. Unexpected.", 2224);
}
return roots.get(0).isEqual(otherRoots.get(0));
} else {
return false;
}
}
@Override
public void explain(PrintStream ps, String format, boolean verbose)
throws FrontendException {
ps.println("#-----------------------------------------------");
ps.println("# New Logical Expression Plan:");
ps.println("#-----------------------------------------------");
LogicalPlanPrinter npp = new LogicalPlanPrinter(this, ps);
npp.visit();
}
/**
* Merge all nodes in lgExpPlan, keep the connections
* @param lgExpPlan plan to merge
* @return sources of the merged plan
*/
public List<Operator> merge(LogicalExpressionPlan lgExpPlan) {
List<Operator> sources = lgExpPlan.getSources();
Iterator<Operator> iter = lgExpPlan.getOperators();
while (iter.hasNext()) {
LogicalExpression op = (LogicalExpression)iter.next();
op.setPlan(this);
add(op);
}
iter = lgExpPlan.getOperators();
while (iter.hasNext()) {
LogicalExpression startOp = (LogicalExpression)iter.next();
ArrayList<Operator> endOps = (ArrayList<Operator>)lgExpPlan.fromEdges.get(startOp);
if (endOps!=null) {
for (Operator endOp : endOps) {
connect(startOp, endOp);
}
}
}
return sources;
}
public LogicalExpressionPlan deepCopy() throws FrontendException {
LogicalExpressionPlan result = new LogicalExpressionPlan();
LogicalExpression root = (LogicalExpression)getSources().get( 0 );
LogicalExpression newRoot = root.deepCopy( result );
result.add( newRoot );
return result;
}
}