/*
* 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 java.util.List;
import java.util.Map;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.POStatus;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.Result;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhyPlanVisitor;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.DataByteArray;
import org.apache.pig.data.DataType;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.plan.OperatorKey;
import org.apache.pig.impl.plan.NodeIdGenerator;
import org.apache.pig.impl.plan.VisitorException;
public class POMapLookUp extends ExpressionOperator {
private static final long serialVersionUID = 1L;
private String key;
public POMapLookUp(OperatorKey k) {
super(k);
}
public POMapLookUp(OperatorKey k, int rp) {
super(k, rp);
}
public POMapLookUp(OperatorKey k, int rp, String key) {
super(k, rp);
this.key = key;
}
public void setLookUpKey(String key) {
this.key = key;
}
public String getLookUpKey() {
return key;
}
@Override
public void visit(PhyPlanVisitor v) throws VisitorException {
v.visitMapLookUp(this);
}
@Override
public String name() {
return "POMapLookUp" + "[" + DataType.findTypeName(resultType) + "]" +" - " + mKey.toString();
}
@Override
public boolean supportsMultipleInputs() {
return false;
}
@Override
public Result processInput() throws ExecException {
Result res = new Result();
Map<String, Object> inpValue = null;
if (input == null && (inputs == null || inputs.size()==0)) {
// log.warn("No inputs found. Signaling End of Processing.");
res.returnStatus = POStatus.STATUS_EOP;
return res;
}
if (!isInputAttached())
return inputs.get(0).getNext(inpValue);
else {
res.result = input;
res.returnStatus = POStatus.STATUS_OK;
detachInput();
return res;
}
}
@SuppressWarnings("unchecked")
private Result getNext() throws ExecException {
Result res = processInput();
if(res.result != null && res.returnStatus == POStatus.STATUS_OK) {
res.result = ((Map<String, Object>)res.result).get(key);
}
return res;
}
@Override
public Result getNext(Boolean b) throws ExecException {
return getNext();
}
@Override
public Result getNext(DataBag db) throws ExecException {
return getNext();
}
@Override
public Result getNext(DataByteArray ba) throws ExecException {
return getNext();
}
@Override
public Result getNext(Double d) throws ExecException {
return getNext();
}
@Override
public Result getNext(Float f) throws ExecException {
return getNext();
}
@Override
public Result getNext(Integer i) throws ExecException {
return getNext();
}
@Override
public Result getNext(Long l) throws ExecException {
return getNext();
}
@Override
public Result getNext(Map m) throws ExecException {
return getNext();
}
@Override
public Result getNext(String s) throws ExecException {
return getNext();
}
@Override
public Result getNext(Tuple t) throws ExecException {
return getNext();
}
@Override
public POMapLookUp clone() throws CloneNotSupportedException {
POMapLookUp clone = new POMapLookUp(new OperatorKey(mKey.scope,
NodeIdGenerator.getGenerator().getNextNodeId(mKey.scope)), -1, key);
clone.cloneHelper(this);
return clone;
}
@Override
public List<ExpressionOperator> getChildExpressions() {
return null;
}
@Override
public Tuple illustratorMarkup(Object in, Object out, int eqClassIndex) {
return (Tuple) out;
}
}