org.kitesdk.morphline.stdlib.AbstractFieldTransformCommand Maven / Gradle / Ivy
/*
* Copyright 2013 Cloudera Inc.
*
* 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://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.kitesdk.morphline.stdlib;
import java.util.ListIterator;
import org.kitesdk.morphline.api.Command;
import org.kitesdk.morphline.api.CommandBuilder;
import org.kitesdk.morphline.api.MorphlineContext;
import org.kitesdk.morphline.api.Record;
import org.kitesdk.morphline.base.AbstractCommand;
import com.typesafe.config.Config;
/**
* Base class for convenient implementation of commands that do in-place updates on a field.
*/
public abstract class AbstractFieldTransformCommand extends AbstractCommand {
private final String fieldName;
protected AbstractFieldTransformCommand(CommandBuilder builder, Config config, Command parent, Command child, MorphlineContext context) {
super(builder, config, parent, child, context);
this.fieldName = getConfigs().getString(config, "field");
}
/** Deprecated; Will be removed in the next release */
@Deprecated
protected AbstractFieldTransformCommand(Config config, Command parent, Command child, MorphlineContext context) {
super(config, parent, child, context);
this.fieldName = getConfigs().getString(config, "field");
}
@Override
@SuppressWarnings("unchecked")
protected final boolean doProcess(Record record) {
ListIterator iter = record.get(fieldName).listIterator();
while (iter.hasNext()) {
iter.set(transformFieldValue(iter.next()));
}
return super.doProcess(record);
}
/** Transforms the given input value to some output value */
protected abstract Object transformFieldValue(Object value);
}