io.druid.cli.convert.PrefixRename Maven / Gradle / Ivy
/*
* Druid - a distributed column store.
* Copyright 2012 - 2015 Metamarkets Group 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 io.druid.cli.convert;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.atomic.AtomicBoolean;
/**
*/
public class PrefixRename implements PropertyConverter
{
private final String prefix;
private final String outputPrefix;
private final AtomicBoolean ran = new AtomicBoolean(false);
public PrefixRename(
String prefix,
String outputPrefix
)
{
this.prefix = prefix;
this.outputPrefix = outputPrefix;
}
@Override
public boolean canHandle(String property)
{
return property.startsWith(prefix) && !ran.get();
}
@Override
public Map convert(Properties properties)
{
if (!ran.getAndSet(true)) {
Map retVal = Maps.newLinkedHashMap();
for (String property : properties.stringPropertyNames()) {
if (property.startsWith(prefix)) {
retVal.put(property.replace(prefix, outputPrefix), properties.getProperty(property));
}
}
return retVal;
}
return ImmutableMap.of();
}
}