com.hazelcast.org.apache.calcite.plan.visualizer.NodeUpdateHelper 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 com.hazelcast.org.apache.calcite.plan.visualizer;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
/**
* Helper class to create the node update.
*/
class NodeUpdateHelper {
private final String key;
private final @Nullable RelNode rel;
private final NodeUpdateInfo state;
private @Nullable NodeUpdateInfo update = null;
NodeUpdateHelper(String key, @Nullable RelNode rel) {
this.key = key;
this.rel = rel;
this.state = new NodeUpdateInfo();
}
String getKey() {
return key;
}
@Nullable RelNode getRel() {
return this.rel;
}
void updateAttribute(final String attr, final Object newValue) {
if (Objects.equals(newValue, state.get(attr))) {
return;
}
state.put(attr, newValue);
if (update == null) {
update = new NodeUpdateInfo();
}
if (newValue instanceof List
&& ((List>) newValue).size() == 0
&& !update.containsKey(attr)) {
return;
}
update.put(attr, newValue);
}
boolean isEmptyUpdate() {
return this.update == null || update.isEmpty();
}
/**
* Gets an object representing all the changes since the last call to this method.
*
* @return an object or null if there are no changes.
*/
@Nullable Object getAndResetUpdate() {
if (isEmptyUpdate()) {
return null;
}
NodeUpdateInfo update = this.update;
this.update = null;
return update;
}
Map getState() {
return Collections.unmodifiableMap(this.state);
}
/**
* Get the current value for the attribute.
*/
@Nullable Object getValue(final String attr) {
return this.state.get(attr);
}
/**
* Type alias.
*/
private static class NodeUpdateInfo extends LinkedHashMap {
}
}
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