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AbstractFunction.java
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AbstractFunction.java
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/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http:https://stratosphere.eu)
*
* Licensed 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:https://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 eu.stratosphere.api.common.functions;
import eu.stratosphere.configuration.Configuration;
import java.io.Serializable;
/**
* An abstract stub implementation that does nothing when opened or closed.
*/
public abstract class AbstractFunction implements Function, Serializable {
private static final long serialVersionUID = 1L;
// --------------------------------------------------------------------------------------------
// Runtime context access
// --------------------------------------------------------------------------------------------
private transient RuntimeContext runtimeContext;
public final void setRuntimeContext(RuntimeContext t) {
if (this.runtimeContext == null) {
this.runtimeContext = t;
} else {
throw new IllegalStateException("Error: The runtime context has already been set.");
}
}
public final RuntimeContext getRuntimeContext() {
if (this.runtimeContext != null) {
return this.runtimeContext;
} else {
throw new IllegalStateException("The runtime context has not been initialized.");
}
}
public final IterationRuntimeContext getIterationRuntimeContext() {
if (this.runtimeContext == null) {
throw new IllegalStateException("The runtime context has not been initialized.");
} else if (this.runtimeContext instanceof IterationRuntimeContext) {
return (IterationRuntimeContext) this.runtimeContext;
} else {
throw new IllegalStateException("This stub is not part of an iteration step function.");
}
}
// --------------------------------------------------------------------------------------------
// Default life cycle methods
// --------------------------------------------------------------------------------------------
@Override
public void open(Configuration parameters) throws Exception {}
@Override
public void close() throws Exception {}
}