/*
 * Copyright 2014 Effektif GmbH.
 *
 * 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 com.effektif.workflow.api.types;

import java.lang.reflect.Type;

import com.effektif.workflow.api.bpmn.BpmnReadable;
import com.effektif.workflow.api.bpmn.BpmnReader;
import com.effektif.workflow.api.bpmn.BpmnWritable;
import com.effektif.workflow.api.bpmn.BpmnWriter;
import com.effektif.workflow.api.workflow.Variable;
import sun.reflect.generics.reflectiveObjects.NotImplementedException;

/**
 * Indicates the type of workflow instance variable data.
 *
 * @author Tom Baeyens
 */
public class DataType implements BpmnReadable, BpmnWritable {

  // protected String typeName = getClass().getAnnotation(TypeName.class).value();

  /**
   * Default implementation, which is a no-op because the <code>type</code> attribute has to be read by the
   * {@link Variable} instance to instance this object first. This method exists so that types with additional
   * parameters can override in order to read nested XML elements.
   */
  @Override
  public void readBpmn(BpmnReader r) {
  }

  /**
   * Default implementation, which just adds a <code>type</code> attribute.
   * Types with additional parameters will need to override and write additional XML.
   */
  @Override
  public void writeBpmn(BpmnWriter w) {
  }

  /**
   * Default String value implementation for reading typed values for BPMN, used to export a variable’s default value.
   */
  public Object readBpmnValue(BpmnReader r) {
    return r.readStringAttributeEffektif("value");
  }

  /**
   * Default String value implementation for writing typed values for BPMN, used to export a variable’s default value.
   */
  public void writeBpmnValue(BpmnWriter w, Object value) {
    if (value != null) {
      w.writeStringAttributeEffektif("value", value.toString());
    }
  }

  public Type getValueType() {
    return Object.class;
  }
}