org.apache.samza.sql.testutil.ConfigUtil.java Source code

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Here is the source code for org.apache.samza.sql.testutil.ConfigUtil.java

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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF 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 org.apache.samza.sql.testutil;

import java.util.Properties;

import org.apache.commons.lang.StringUtils;

/**
 * Utility methods to aid with config management.
 */
public class ConfigUtil {

    private ConfigUtil() {
    }

    /**
     * Method is used to filter just the properties with the prefix.
     * @param props Full set of properties
     * @param prefix Prefix of the keys that in the config that needs to be filtered out.
     * @param preserveFullKey If set to true, after filtering, preserves the full key including the prefix.
     *                        If set to false, Strips out the prefix from the key before returning.
     * @return Returns the filtered set of properties matching the prefix from the input property bag.
     */
    public static Properties getDomainProperties(Properties props, String prefix, boolean preserveFullKey) {
        String fullPrefix;
        if (StringUtils.isBlank(prefix)) {
            fullPrefix = ""; // this will effectively retrieve all properties
        } else {
            fullPrefix = prefix.endsWith(".") ? prefix : prefix + ".";
        }
        Properties ret = new Properties();
        props.keySet().stream().map(String.class::cast).forEach(keyStr -> {
            if (keyStr.startsWith(fullPrefix) && !keyStr.equals(fullPrefix)) {
                if (preserveFullKey) {
                    ret.put(keyStr, props.get(keyStr));
                } else {
                    ret.put(keyStr.substring(fullPrefix.length()), props.get(keyStr));
                }
            }
        });
        return ret;
    }
}