/*
* 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.beam.sdk.transforms.windowing;
/**
* Exception thrown by {@link WindowFn#verifyCompatibility(WindowFn)} if two compared
* WindowFns are not compatible, including the explanation of incompatibility.
*/
public class IncompatibleWindowException extends Exception {
private WindowFn<?, ?> givenWindowFn;
private String reason;
public IncompatibleWindowException(WindowFn<?, ?> windowFn, String reason) {
this.givenWindowFn = windowFn;
this.reason = reason;
}
@Override
public String getMessage() {
String windowFn = givenWindowFn == null ? "null" : givenWindowFn.getClass().getSimpleName();
return String.format("The given WindowFn is %s. %s", windowFn, reason);
}
}