org.apache.pig.impl.plan.NodeIdGenerator Maven / Gradle / Ivy
/*
* 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.impl.plan;
import java.util.Map;
import java.util.HashMap;
public class NodeIdGenerator {
private Map scopeToIdMap;
private static NodeIdGenerator theGenerator = new NodeIdGenerator();
private NodeIdGenerator() {
scopeToIdMap = new HashMap();
}
public static NodeIdGenerator getGenerator() {
return theGenerator;
}
public long getNextNodeId(String scope) {
Long val = scopeToIdMap.get(scope);
long nextId = 0;
if (val != null) {
nextId = val.longValue();
}
scopeToIdMap.put(scope, nextId + 1);
return nextId;
}
public static void reset(String scope) {
theGenerator.scopeToIdMap.put(scope, 0L) ;
}
}