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    • org.bridje.web.session.WebSessionManager Maven / Gradle / Ivy

    /*
 * Copyright 2016 Bridje Framework.
 *
 * 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.bridje.web.session;

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.bridje.el.ElService;
import org.bridje.ioc.Component;
import org.bridje.ioc.Inject;
import org.bridje.ioc.IocContext;
import org.bridje.web.WebScope;

@Component
class WebSessionManager
{
    private static final Logger LOG = Logger.getLogger(WebSessionManager.class.getName());

    private Map, Map> sessionFields;
    
    @Inject
    private ElService elServ;

    public String findSessionFieldName(Class clazz, Field field)
    {
        return field.getAnnotation(WebSessionField.class).value();
    }
    
    public Set injectValue(IocContext ctx, Class clazz, Object instance, WebSession session)
    {
        if(sessionFields == null)
        {
            initSessionFields(ctx);
        }
        Map lst = sessionFields.get(clazz);
        if(lst != null)
        {
            Set result = new HashSet<>();
            lst.forEach((field, sessName) ->
            {
                try
                {
                    String value = session.find(sessName);
                    result.add(field);
                    if(value != null)
                    {
                        field.set(instance, unserialize(value, field));
                    }
                }
                catch (IllegalArgumentException | IllegalAccessException e)
                {
                    LOG.log(Level.SEVERE, e.getMessage(), e);
                }
            });
            return result;
        }
        return null;
    }
    
    public Set storeValue(IocContext ctx, Class clazz, Object instance, WebSession session)
    {
        if(sessionFields == null)
        {
            initSessionFields(ctx);
        }
        Set result = new HashSet<>();
        Map lst = sessionFields.get(clazz);
        if(lst != null)
        {
            lst.forEach((field, sessName) ->
            {
                try
                {
                    Object value = field.get(instance);
                    session.save(sessName, serialize(value));
                    result.add(field);
                }
                catch (IllegalArgumentException | IllegalAccessException e)
                {
                    LOG.log(Level.SEVERE, e.getMessage(), e);
                }
            });
        }
        return result;
    }

    private synchronized void initSessionFields(IocContext ctx)
    {
        if(sessionFields == null)
        {
            Map, Map> result = new HashMap<>();
            ctx.getClassRepository().forEachField(WebSessionField.class, (field, component, annot) ->
            {
                Map lst = result.get(component);
                if(lst == null)
                {
                    lst = new HashMap<>();
                    result.put(component, lst);
                }
                field.setAccessible(true);
                String name = findSessionFieldName(component, field);
                lst.put(field, name);
            });
            sessionFields = result;
        }
    }

    private String serialize(Object value)
    {
        if(value == null)
        {
            return null;
        }
        if(value instanceof String)
        {
            return (String)value;
        }
        return elServ.convert(value, String.class);
    }

    private Object unserialize(String value, Field field)
    {
        if(value == null)
        {
            return null;
        }
        if(field.getType().equals(String.class))
        {
            return value;
        }
        return elServ.convert(value, field.getType());
    }
}
    
    
    
    

    




    
    
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