/*
* 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.HashMap;
import java.util.ListIterator;
import java.util.Map;
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 org.kitesdk.morphline.base.Configs;
import com.typesafe.config.Config;
/**
* Command that examines each string value in a given field and replaces it with the replacement
* value defined in a given dictionary aka hash table.
*/
public final class TranslateBuilder implements CommandBuilder {
@Override
public Collection<String> getNames() {
return Collections.singletonList("translate");
}
@Override
public Command build(Config config, Command parent, Command child, MorphlineContext context) {
return new Translate(this, config, parent, child, context);
}
///////////////////////////////////////////////////////////////////////////////
// Nested classes:
///////////////////////////////////////////////////////////////////////////////
private static final class Translate extends AbstractCommand {
private final String fieldName;
private final Map<String, Object> dictionary = new HashMap<String, Object>();
private final Object fallback;
public Translate(CommandBuilder builder, Config config, Command parent, Command child, MorphlineContext context) {
super(builder, config, parent, child, context);
this.fieldName = getConfigs().getString(config, "field");
Config dict = getConfigs().getConfig(config, "dictionary");
for (Map.Entry<String, Object> entry : new Configs().getEntrySet(dict)) {
dictionary.put(entry.getKey(), entry.getValue());
}
this.fallback = getConfigs().getString(config, "fallback", null);
validateArguments();
}
@Override
@SuppressWarnings("unchecked")
protected boolean doProcess(Record record) {
ListIterator iter = record.get(fieldName).listIterator();
while (iter.hasNext()) {
String key = iter.next().toString();
Object value = dictionary.get(key);
if (value != null) {
iter.set(value);
} else if (fallback != null) {
iter.set(fallback);
} else {
LOG.debug("No match found for key: {}", key);
return false;
}
}
// pass record to next command in chain:
return super.doProcess(record);
}
}
}