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Grails Web Application Framework

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/*
 * Copyright 2011 SpringSource
 *
 * 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 org.grails.validation

import grails.config.Config
import grails.config.Settings
import grails.util.ClosureToMapPopulator

import org.grails.core.lifecycle.ShutdownOperations

/**
 * Utility methods for configuring constraints
 *
 * @author Graeme Rocher
 * @since 2.0
 */
class ConstraintEvalUtils {

    static {
        ShutdownOperations.addOperation({
            clearDefaultConstraints()
        } as Runnable, true)
    }

    private static defaultConstraintsMap
    private static configId

    /**
     * Looks up the default configured constraints from the given configuration
     */
    static Map getDefaultConstraints(Config config) {
        def cid = System.identityHashCode(config)
        if (defaultConstraintsMap == null || configId != cid) {
            configId = cid
            def constraints = config.getProperty(Settings.GORM_DEFAULT_CONSTRAINTS, Closure)
            if (constraints) {
                defaultConstraintsMap = new ClosureToMapPopulator().populate((Closure) constraints)
            }
            else {
                defaultConstraintsMap = Collections.emptyMap()
            }
        }
        return defaultConstraintsMap
    }

    static void clearDefaultConstraints() {
        defaultConstraintsMap =  null
        configId = null
    }
}