/*
* Copyright © 2015-2016 Cask Data, 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 co.cask.cdap.etl.mock.transform;
import co.cask.cdap.api.annotation.Name;
import co.cask.cdap.api.annotation.Plugin;
import co.cask.cdap.api.data.format.StructuredRecord;
import co.cask.cdap.api.plugin.PluginClass;
import co.cask.cdap.api.plugin.PluginConfig;
import co.cask.cdap.api.plugin.PluginPropertyField;
import co.cask.cdap.etl.api.Emitter;
import co.cask.cdap.etl.api.Transform;
import co.cask.cdap.etl.proto.v2.ETLPlugin;
import java.util.HashMap;
import java.util.Map;
/**
* Transform that filters out records whose configured field is a configured value.
* For example, can filter all records whose 'foo' field is equal to 'bar'. Assumes the field is of type string.
*/
@Plugin(type = Transform.PLUGIN_TYPE)
@Name("StringValueFilter")
public class StringValueFilterTransform extends Transform<StructuredRecord, StructuredRecord> {
public static final PluginClass PLUGIN_CLASS = getPluginClass();
private final Config config;
public StringValueFilterTransform(Config config) {
this.config = config;
}
@Override
public void transform(StructuredRecord input, Emitter<StructuredRecord> emitter) throws Exception {
String value = input.get(config.field);
if (!config.value.equals(value)) {
emitter.emit(input);
}
}
/**
* Config for the transform.
*/
public static class Config extends PluginConfig {
private String field;
private String value;
}
public static ETLPlugin getPlugin(String field, String value) {
Map<String, String> properties = new HashMap<>();
properties.put("field", field);
properties.put("value", value);
return new ETLPlugin("StringValueFilter", Transform.PLUGIN_TYPE, properties, null);
}
private static PluginClass getPluginClass() {
Map<String, PluginPropertyField> properties = new HashMap<>();
properties.put("field", new PluginPropertyField("field", "", "string", true));
properties.put("value", new PluginPropertyField("value", "", "string", true));
return new PluginClass(Transform.PLUGIN_TYPE, "StringValueFilter", "", StringValueFilterTransform.class.getName(),
"config", properties);
}
}