/**
* 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.drill.exec.vector;
import org.apache.drill.exec.util.CallBack;
public class SchemaChangeCallBack implements CallBack {
private boolean schemaChanged = false;
/**
* Constructs a schema-change callback with the schema-changed state set to
* {@code false}.
*/
public SchemaChangeCallBack() {
}
/**
* Sets the schema-changed state to {@code true}.
*/
@Override
public void doWork() {
schemaChanged = true;
}
/**
* Returns the value of schema-changed state, <strong>resetting</strong> the
* schema-changed state to {@code false}.
*/
public boolean getSchemaChangedAndReset() {
final boolean current = schemaChanged;
schemaChanged = false;
return current;
}
}