/*
 * Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
 * 
 * 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 freemarker.core;

import java.util.Properties;

import freemarker.ext.beans.BeansWrapper;
import freemarker.template.Configuration;

/**
 * Don't use this; used internally by FreeMarker, might changes without notice.
 * The runtime environment used during the evaluation of configuration {@link Properties}.
 */
public class _SettingEvaluationEnvironment {
    
    private static final ThreadLocal CURRENT = new ThreadLocal();

    private BeansWrapper objectWrapper;
    
    public static _SettingEvaluationEnvironment getCurrent() {
        Object r = CURRENT.get();
        if (r != null) {
            return (_SettingEvaluationEnvironment) r;
        }
        return new _SettingEvaluationEnvironment();
    }
    
    public static _SettingEvaluationEnvironment startScope() {
        Object previous = CURRENT.get();
        CURRENT.set(new _SettingEvaluationEnvironment());
        return (_SettingEvaluationEnvironment) previous;
    }
    
    public static void endScope(_SettingEvaluationEnvironment previous) {
        CURRENT.set(previous);
    }

    public BeansWrapper getObjectWrapper() {
        if (objectWrapper == null) {
            objectWrapper = new BeansWrapper(Configuration.VERSION_2_3_21);
        }
        return objectWrapper;
    }
    
}