cayenne-server/src/main/java/org/apache/cayenne/configuration/DefaultRuntimeProperties.java

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 *  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
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package org.apache.cayenne.configuration;

import java.util.Map;

import org.apache.cayenne.di.Inject;

/**
 * An implementation of {@link RuntimeProperties} that returns properties that
 * were injected via a map in constructor. Each property can be overridden via
 * -D command line option (i.e. in this implementation JVM system properties
 * take precedence over any other property configuration mechanism).
 * 
 * @since 3.1
 */
public class DefaultRuntimeProperties implements RuntimeProperties {

    protected Map<String, String> properties;

    public DefaultRuntimeProperties(@Inject(Constants.PROPERTIES_MAP) Map<String, String> properties) {
        this.properties = properties;
    }

    @Override
    public String get(String key) {

        // TODO: note that System.getProperty uses a synchronized hashtable
        // internally as
        // of Java 1.6. So this method suddenly becomes a synchronization
        // bottleneck.
        String property = System.getProperty(key);

        if (property != null) {
            return property;
        }

        return properties.get(key);
    }

    /**
     * @since 4.0
     */
    @Override
    public String get(String key, String defaultValue) {
        String string = get(key);
        return string != null ? string : defaultValue;
    }

    @Override
    public long getLong(String key, long defaultValue) {
        String string = get(key);
        if (string == null) {
            return defaultValue;
        }

        try {
            return Long.parseLong(string);
        } catch (NumberFormatException e) {
            // incorrect property format, should we rethrow?
            return defaultValue;
        }
    }

    @Override
    public int getInt(String key, int defaultValue) {
        String string = get(key);
        if (string == null) {
            return defaultValue;
        }

        try {
            return Integer.parseInt(string);
        } catch (NumberFormatException e) {
            // incorrect property format, should we rethrow?
            return defaultValue;
        }
    }

    @Override
    public boolean getBoolean(String key, boolean defaultValue) {
        String string = get(key);
        return string != null ? "true".equalsIgnoreCase(string) : defaultValue;
    }
}