com.hazelcast.org.apache.calcite.plan.MulticastRelOptListener 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 com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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 com.hazelcast.org.apache.calcite.plan;
import java.util.ArrayList;
import java.util.List;
/**
* MulticastRelOptListener implements the {@link RelOptListener} interface by
* forwarding events on to a collection of other listeners.
*/
public class MulticastRelOptListener implements RelOptListener {
//~ Instance fields --------------------------------------------------------
private final List listeners;
//~ Constructors -----------------------------------------------------------
/**
* Creates a new empty multicast listener.
*/
public MulticastRelOptListener() {
listeners = new ArrayList<>();
}
//~ Methods ----------------------------------------------------------------
/**
* Adds a listener which will receive multicast events.
*
* @param listener listener to add
*/
public void addListener(RelOptListener listener) {
listeners.add(listener);
}
// implement RelOptListener
public void relEquivalenceFound(RelEquivalenceEvent event) {
for (RelOptListener listener : listeners) {
listener.relEquivalenceFound(event);
}
}
// implement RelOptListener
public void ruleAttempted(RuleAttemptedEvent event) {
for (RelOptListener listener : listeners) {
listener.ruleAttempted(event);
}
}
// implement RelOptListener
public void ruleProductionSucceeded(RuleProductionEvent event) {
for (RelOptListener listener : listeners) {
listener.ruleProductionSucceeded(event);
}
}
// implement RelOptListener
public void relChosen(RelChosenEvent event) {
for (RelOptListener listener : listeners) {
listener.relChosen(event);
}
}
// implement RelOptListener
public void relDiscarded(RelDiscardedEvent event) {
for (RelOptListener listener : listeners) {
listener.relDiscarded(event);
}
}
}