Schema.java

/***************************************************************************
 * Copyright (c) 2012-2013 VMware, Inc. All Rights Reserved.
 * 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.vmware.aurora.composition;

import java.lang.reflect.Field;

/**
 * Base class representing the Schema
 *
 * @author sridharr
 *
 */

abstract public class Schema {

   @Override
   public String toString() {
      StringBuilder result = new StringBuilder();
      String newLine = System.getProperty("line.separator");

      result.append(this.getClass().getName());
      result.append(" Object {");
      result.append(newLine);

      //determine fields declared in this class only (no fields of superclass)
      Field[] fields = this.getClass().getDeclaredFields();

      //print field names paired with their values
      for (Field field : fields) {
         result.append("  ");
         try {
            result.append(field.getName());
            result.append(": ");
            // requires access to private field:
            result.append(fieldValueOf(field));
         } catch (IllegalAccessException ex) {
            System.out.println(ex);
         }
         result.append(newLine);
      }
      result.append("}");

      return result.toString();
   }

   abstract protected Object fieldValueOf(Field field)
         throws IllegalArgumentException, IllegalAccessException;

}