/*
* 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.Collection;
import java.util.Collections;
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;
/**
* A Not command consists of one nested command, the boolean return value of which is inverted.
*/
public final class NotBuilder implements CommandBuilder {
@Override
public Collection<String> getNames() {
return Collections.singletonList("not");
}
@Override
public Command build(Config config, Command parent, Command child, MorphlineContext context) {
return new Not(this, config, parent, child, context);
}
///////////////////////////////////////////////////////////////////////////////
// Nested classes:
///////////////////////////////////////////////////////////////////////////////
private static final class Not extends AbstractCommand {
private final Command realChild;
public Not(CommandBuilder builder, Config config, Command parent, Command child, MorphlineContext context) {
super(builder, config, parent, child, context);
Command devNull = new DropRecordBuilder().build(null, this, null, context); // pipes into /dev/null
realChild = buildCommand(config, this, devNull);
}
@Override
protected boolean doProcess(Record record) {
return !realChild.process(record) && super.doProcess(record);
}
@Override
protected void doNotify(Record notification) {
realChild.notify(notification);
super.doNotify(notification);
}
}
}