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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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.camunda.bpm.engine.impl.el;

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

import org.camunda.bpm.engine.impl.javax.el.ELContext;
import org.camunda.bpm.engine.impl.javax.el.ELResolver;
import org.camunda.bpm.engine.variable.context.VariableContext;
import org.camunda.bpm.engine.variable.value.TypedValue;

/**
 * @author Daniel Meyer
 *
 */
public class VariableContextElResolver extends ELResolver {

  public static final String VAR_CTX_KEY = "variableContext";

  @Override
  public Object getValue(ELContext context, Object base, Object property) {
    if (base == null) {
      VariableContext variableContext = (VariableContext) context.getContext(VariableContext.class);
      if(variableContext != null) {
        if(VAR_CTX_KEY.equals(property)) {
          context.setPropertyResolved(true);
          return variableContext;
        }
        TypedValue typedValue = variableContext.resolve((String) property);
        if(typedValue != null) {
          context.setPropertyResolved(true);
          return unpack(typedValue);
        }
      }
    }
    return null;
  }

  @Override
  public void setValue(ELContext context, Object base, Object property, Object value) {
    // read only
  }

  @Override
  public boolean isReadOnly(ELContext context, Object base, Object property) {
    // always read only
    return true;
  }

  public Class< ? > getCommonPropertyType(ELContext arg0, Object arg1) {
    return Object.class;
  }

  public Iterator getFeatureDescriptors(ELContext arg0, Object arg1) {
    return null;
  }

  public Class< ? > getType(ELContext arg0, Object arg1, Object arg2) {
    return Object.class;
  }

  protected Object unpack(TypedValue typedValue) {
    if(typedValue != null) {
      return typedValue.getValue();
    }
    return null;
  }

}