io.gravitee.common.util.EnvironmentUtils.java Source code

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Here is the source code for io.gravitee.common.util.EnvironmentUtils.java

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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * 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.gravitee.common.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.env.CompositePropertySource;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.EnumerablePropertySource;
import org.springframework.core.env.PropertySource;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author GraviteeSource Team
 */
public final class EnvironmentUtils {

    private static final Logger LOGGER = LoggerFactory.getLogger(EnvironmentUtils.class);

    public static Map<String, Object> getPropertiesStartingWith(ConfigurableEnvironment aEnv, String aKeyPrefix) {
        Map<String, Object> result = new HashMap<>();
        Map<String, Object> map = getAllProperties(aEnv);

        for (Map.Entry<String, Object> entry : map.entrySet()) {
            String key = entry.getKey();

            if (encodedKey(key).startsWith(encodedKey(aKeyPrefix))) {
                result.put(key, entry.getValue());
            }
        }

        return result;
    }

    public static Object get(String key, Map<String, Object> map) {
        if (map == null || map.isEmpty()) {
            return null;
        }

        return map.get(encodedKey(key));
    }

    public static String encodedKey(String key) {
        return key.replaceAll("\\.", "_").replaceAll("\\[", "_").replaceAll("\\]", "").toUpperCase();
    }

    public static Map<String, Object> getAllProperties(ConfigurableEnvironment aEnv) {
        Map<String, Object> result = new HashMap<>();
        aEnv.getPropertySources().forEach(ps -> addAll(result, getAllProperties(ps)));
        return result;
    }

    public static Map<String, Object> getAllProperties(PropertySource<?> aPropSource) {
        Map<String, Object> result = new HashMap<>();

        if (aPropSource instanceof CompositePropertySource) {
            CompositePropertySource cps = (CompositePropertySource) aPropSource;
            cps.getPropertySources().forEach(ps -> addAll(result, getAllProperties(ps)));
            return result;
        }

        if (aPropSource instanceof EnumerablePropertySource<?>) {
            EnumerablePropertySource<?> ps = (EnumerablePropertySource<?>) aPropSource;
            Arrays.asList(ps.getPropertyNames()).forEach(key -> result.put(key, ps.getProperty(key)));
            return result;
        }

        // note: Most descendants of PropertySource are EnumerablePropertySource. There are some
        // few others like JndiPropertySource or StubPropertySource
        LOGGER.debug("Given PropertySource is instanceof " + aPropSource.getClass().getName()
                + " and cannot be iterated");

        return result;
    }

    private static void addAll(Map<String, Object> aBase, Map<String, Object> aToBeAdded) {
        for (Map.Entry<String, Object> entry : aToBeAdded.entrySet()) {
            if (aBase.containsKey(entry.getKey())) {
                continue;
            }

            aBase.put(entry.getKey(), entry.getValue());
        }
    }
}