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/* 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.activiti.spring;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.impl.javax.el.ELContext;
import org.activiti.engine.impl.javax.el.ELResolver;
import org.springframework.context.ApplicationContext;

import java.beans.FeatureDescriptor;
import java.util.Iterator;

/**
 * @author Tom Baeyens
 * @author Frederik Heremans
 */
public class ApplicationContextElResolver extends ELResolver {

    protected ApplicationContext applicationContext;

    public ApplicationContextElResolver(ApplicationContext applicationContext) {
        this.applicationContext = applicationContext;
    }

    public Object getValue(ELContext context, Object base, Object property) {
        if (base == null) {
            // according to javadoc, can only be a String
            String key = (String) property;

            if (applicationContext.containsBean(key)) {
                context.setPropertyResolved(true);
                return applicationContext.getBean(key);
            }
        }

        return null;
    }

    public boolean isReadOnly(ELContext context, Object base, Object property) {
        return true;
    }

    public void setValue(ELContext context, Object base, Object property, Object value) {
        if (base == null) {
            String key = (String) property;
            if (applicationContext.containsBean(key)) {
                throw new ActivitiException("Cannot set value of '" + property +
                        "', it resolves to a bean defined in the Spring application-context.");
            }
        }
    }

    public Class getCommonPropertyType(ELContext context, Object arg) {
        return Object.class;
    }

    public Iterator getFeatureDescriptors(ELContext context, Object arg) {
        return null;
    }

    public Class getType(ELContext context, Object arg1, Object arg2) {
        return Object.class;
    }
}