org.kitesdk.morphline.stdlib.ToStringBuilder 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.Collection;
import java.util.Collections;
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;
/**
* Command that converts the Java objects in a given field via Object.toString()
to
* their string representation, and optionally also applies String.trim()
.
*/
public final class ToStringBuilder implements CommandBuilder {
@Override
public Collection getNames() {
return Collections.singletonList("toString");
}
@Override
public Command build(Config config, Command parent, Command child, MorphlineContext context) {
return new ToString(this, config, parent, child, context);
}
///////////////////////////////////////////////////////////////////////////////
// Nested classes:
///////////////////////////////////////////////////////////////////////////////
private static final class ToString extends AbstractCommand {
private final String fieldName;
private final boolean trim;
public ToString(CommandBuilder builder, Config config, Command parent, Command child, MorphlineContext context) {
super(builder, config, parent, child, context);
this.fieldName = getConfigs().getString(config, "field");
this.trim = getConfigs().getBoolean(config, "trim", false);
validateArguments();
}
@Override
@SuppressWarnings("unchecked")
protected boolean doProcess(Record record) {
ListIterator iter = record.get(fieldName).listIterator();
while (iter.hasNext()) {
String str = iter.next().toString();
if (trim) {
str = str.trim();
}
iter.set(str);
}
// pass record to next command in chain:
return super.doProcess(record);
}
}
}