org.cloudfoundry.identity.uaa.config.EnvironmentPropertiesFactoryBean.java Source code

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Here is the source code for org.cloudfoundry.identity.uaa.config.EnvironmentPropertiesFactoryBean.java

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/*
 * Cloud Foundry 2012.02.03 Beta
 * Copyright (c) [2009-2012] VMware, Inc. All Rights Reserved.
 *
 * This product is licensed to you under the Apache License, Version 2.0 (the "License").
 * You may not use this product except in compliance with the License.
 *
 * This product includes a number of subcomponents with
 * separate copyright notices and license terms. Your use of these
 * subcomponents is subject to the terms and conditions of the
 * subcomponent's license, as noted in the LICENSE file.
 */
package org.cloudfoundry.identity.uaa.config;

import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.context.EnvironmentAware;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.EnumerablePropertySource;
import org.springframework.core.env.Environment;
import org.springframework.core.env.PropertySource;
import org.springframework.core.env.StandardEnvironment;

/**
 * Factory for Java Properties that reads from the Spring context {@link Environment} where it can.
 * 
 * @author Dave Syer
 * 
 */
public class EnvironmentPropertiesFactoryBean implements FactoryBean<Map<String, ?>>, EnvironmentAware {

    private static Log logger = LogFactory.getLog(EnvironmentPropertiesFactoryBean.class);

    private static final Collection<String> STATIC_PROPERTY_SOURCES = Arrays.asList(
            StandardEnvironment.SYSTEM_PROPERTIES_PROPERTY_SOURCE_NAME,
            StandardEnvironment.SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME);

    private Environment environment;

    private Properties defaultProperties = new Properties();

    public void setDefaultProperties(Properties defaultProperties) {
        this.defaultProperties = defaultProperties;
    }

    @Override
    public void setEnvironment(Environment environment) {
        this.environment = environment;
    }

    @Override
    public Map<String, ?> getObject() {
        Map<String, Object> result = new LinkedHashMap<String, Object>();
        // The result is the default application properties overridden with Spring environment values - reversing the
        // order of the placeholder configurers in the application context.
        for (Object key : defaultProperties.keySet()) {
            String name = (String) key;
            if (environment != null && environment.containsProperty(name)) {
                logger.debug("From Environment: " + name + "=" + environment.getProperty(name));
                result.put(name, environment.getProperty(name));
            } else {
                logger.debug("From Defaults: " + name + "=" + defaultProperties.getProperty(name));
                result.put(name, defaultProperties.get(key));
            }
        }
        // Any properties added only in the environment can be picked up here...
        if (environment instanceof ConfigurableEnvironment) {
            for (PropertySource<?> source : ((ConfigurableEnvironment) environment).getPropertySources()) {
                if (source instanceof EnumerablePropertySource
                        && !STATIC_PROPERTY_SOURCES.contains(source.getName())) {
                    @SuppressWarnings("rawtypes")
                    EnumerablePropertySource enumerable = (EnumerablePropertySource) source;
                    for (String name : enumerable.getPropertyNames()) {
                        result.put(name, environment.getProperty(name));
                    }
                }
            }
        }
        return result;
    }

    @Override
    public Class<?> getObjectType() {
        return Map.class;
    }

    @Override
    public boolean isSingleton() {
        return true;
    }

}