io.druid.cli.convert.PrefixRename.java Source code

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Here is the source code for io.druid.cli.convert.PrefixRename.java

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/*
 * 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<String, String> convert(Properties properties) {
        if (!ran.getAndSet(true)) {
            Map<String, String> 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();
    }
}