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ValueDecorator.java
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ValueDecorator.java
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/**
* 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.handlers.endtoend;
import java.io.IOException;
import com.cloudera.flume.conf.Context;
import com.cloudera.flume.conf.SinkFactory.SinkDecoBuilder;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventSink;
import com.cloudera.flume.core.EventSinkDecorator;
import com.google.common.base.Preconditions;
/**
* This decorator adds values to events that pass through it.
* By default decorator does not escape value, use "escape=true" to escape it.
*/
public class ValueDecorator<S extends EventSink> extends EventSinkDecorator<S> {
public static final String KW_ESCAPE = "escape";
final String attr; // attribute to tag
// We store the value in two forms for optimization purposes
final String unescapedValue;
final byte[] value;
final boolean escape;
public ValueDecorator(S s, String attr, String value) {
this(s, attr, value, false);
}
public ValueDecorator(S s, String attr, String value, boolean escape) {
super(s);
this.attr = attr;
this.escape = escape;
this.unescapedValue = value;
this.value = value.getBytes().clone();
}
public void append(Event e) throws IOException, InterruptedException {
byte[] attrVal = escape ? e.escapeString(unescapedValue).getBytes() : value;
e.set(attr, attrVal);
super.append(e);
}
public static SinkDecoBuilder builder() {
return new SinkDecoBuilder() {
@Override
public EventSinkDecorator<EventSink> build(Context context,
String... argv) {
Preconditions.checkArgument(argv.length == 2,
"usage: value(\"attr\", \"value\"{, " + KW_ESCAPE + "=true|false})");
String attr = argv[0];
String v = argv[1];
String escapedArg = context.getValue(KW_ESCAPE);
boolean escape = (escapedArg == null) ? false : Boolean.parseBoolean(escapedArg);
return new ValueDecorator<EventSink>(null, attr, v, escape);
}
};
}
}