/**
* Licensed to Cloudera, Inc. under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Cloudera, Inc. licenses this file
* to you 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 com.cloudera.flume.core.extractors;
import java.io.IOException;
import com.cloudera.flume.conf.Context;
import com.cloudera.flume.conf.SinkFactory.SinkDecoBuilder;
import com.cloudera.flume.core.Attributes;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventSink;
import com.cloudera.flume.core.EventSinkDecorator;
import com.google.common.base.Preconditions;
/**
* Give a regular expression to split on, split the body in chunks and assign
* the attribute with its value. Currently this uses the String.split function.
*
* TODO (jon) do not convert to string -- instead work directly with byte
* sequences.
*/
public class SplitExtractor extends EventSinkDecorator<EventSink> {
final String attr;
final int idx;
final String splitRegex;
public SplitExtractor(EventSink s, String splitRegex, int tok, String attr) {
super(s);
this.splitRegex = splitRegex;
this.idx = tok;
this.attr = attr;
}
@Override
public void append(Event e) throws IOException, InterruptedException {
String vals[] = new String(e.getBody()).split(splitRegex);
String val = (idx < vals.length) ? vals[idx] : "";
Attributes.setString(e, attr, val);
super.append(e);
}
public static SinkDecoBuilder builder() {
return new SinkDecoBuilder() {
@Override
public EventSinkDecorator<EventSink> build(Context context,
String... argv) {
Preconditions.checkArgument(argv.length == 3,
"usage: split(splitRegex, idx, dstAttr)");
String regex = argv[0];
Integer idx = Integer.parseInt(argv[1]);
String attr = argv[2];
EventSinkDecorator<EventSink> snk = new SplitExtractor(null, regex,
idx, attr);
return snk;
}
};
}
}