/*
 * Copyright 2000-2013 Enonic AS
 * http://www.enonic.com/license
 */
package com.enonic.cms.framework.cache.base;

import java.util.Properties;

/**
 * This class implements the cache manager configuration.
 */
final class CacheManagerConfig
{
    private final static String KEY_PREFIX = "cms.cache.";

    private final static int DEFAULT_MEMORY_CAPACITY = 1000;

    private final static int DEFAULT_TIME_TO_LIVE = 0;

    private final Properties properties;

    public CacheManagerConfig( final Properties properties )
    {
        this.properties = properties;
    }

    private String getProperty( final String key, final String defValue )
    {
        final String value = this.properties.getProperty( KEY_PREFIX + key );
        return value != null ? value : defValue;
    }

    private int getIntegerProperty( final String key, final int defValue )
    {
        final String value = getProperty( key, String.valueOf( defValue ) );

        try
        {
            return Integer.parseInt( value );
        }
        catch ( final Exception e )
        {
            return defValue;
        }
    }

    public CacheConfig getCacheConfig( final String name )
    {
        final int memoryCapacity = getIntegerProperty( name + ".memoryCapacity", DEFAULT_MEMORY_CAPACITY );
        final int timeToLive = getIntegerProperty( name + ".timeToLive", DEFAULT_TIME_TO_LIVE );
        if ( "entity".equalsIgnoreCase( name ) )
        {
            if ( timeToLive != 0 )
            {
                throw new IllegalArgumentException( "Entity cache timeToLive cannot be other than default value (zero). " +
                                                        "Please remove property 'cms.cache.entity.timeToLive' from cms.properties." );
            }
        }

        return new CacheConfig( memoryCapacity, timeToLive );
    }
}