com.netflix.iep.config.ResourceConfiguration.java Source code

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Here is the source code for com.netflix.iep.config.ResourceConfiguration.java

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/*
 * Copyright 2015 Netflix, 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 com.netflix.iep.config;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Map;
import java.util.HashMap;
import java.util.Properties;

import com.google.common.io.Resources;
import com.google.common.base.Charsets;

public class ResourceConfiguration {
    private ResourceConfiguration() {
    }

    public static void load(String propFile) throws IOException {
        load(propFile, new HashMap<String, String>());
    }

    public static void load(String propFile, Map<String, String> subs) throws IOException {
        load(propFile, subs, new HashMap<String, String>());
    }

    public static void load(String propFile, Map<String, String> subs, Map<String, String> overrides)
            throws IOException {
        URL propUrl = Resources.getResource(propFile);
        String propData = Resources.toString(propUrl, Charsets.UTF_8);
        for (Map.Entry e : subs.entrySet()) {
            propData = propData.replaceAll("\\{" + e.getKey() + "\\}", (String) e.getValue());
        }
        final Properties props = new Properties();
        props.load(new ByteArrayInputStream(propData.getBytes()));
        for (Map.Entry e : overrides.entrySet()) {
            props.setProperty((String) e.getKey(), (String) e.getValue());
        }
        Configuration.setBackingStore(new IConfiguration() {
            @Override
            public String get(String key) {
                return (String) props.getProperty(key);
            }
        });
    }
}