Android Open Source - concrete Reflection Util

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The source code is released under:

MIT License

Java Source Code

/*
 *  Copyright (c) 2010 Peter Haldb?k, peter.haldbaek@gmail.com
 * /*w ww . ja v  a2 s .  c o m*/
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *  
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
 *  
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *  THE SOFTWARE.
 */
package com.briskbee.concrete;

import java.lang.reflect.Field;
import java.util.Date;

import android.database.Cursor;

/**
 * Utility class used for various reflection methods.
 * 
 * @author Peter Haldb?k, peter.haldbaek@gmail.com
 */
public class ReflectionUtil {
  
  /**
   * Returns the value of the specified field and column based on the cursor.
   * This is used when selecting data from the database.
   * 
   * @param field the field of the class
   * @param cursor the database cursor holding the value
   * @param column the column index of the table
   * @return the value of the specified column
   */
  public static Object getValue(Field field, Cursor cursor, int column) {
    // Determine type of key
    String type = field.getType().getName();
    if ("java.lang.String".equals(type)) {
      return cursor.getString(column);
    } else if ("long".equals(type)) {
      return cursor.getLong(column);
    } else if ("double".equals(type)) {
      return cursor.getDouble(column);
    } else if ("float".equals(type)) {
      return cursor.getFloat(column);
    } else if ("int".equals(type)) {
      return cursor.getInt(column);
    } else if ("short".equals(type)) {
      return cursor.getShort(column);
    } else if ("java.util.Date".equals(type)) {
      long l = cursor.getLong(column);
      return new Date(l);
    }
    
    return null;
  }
  
  /**
   * Returns <code>true</code> if the specified field is a relation. This is determined
   * by looking at the type of the field. If the type is an instance of the
   * <code>Record</code> class it is considered to be a relation.
   * 
   * @param field the field to examine
   * @return <code>true</code> if the field is a relation; <code>false</code> otherwise
   */
  public static boolean isRelation(Object o, Field field) {
    if (o == null) {
      return Record.class.isAssignableFrom(field.getType());
    }
    return Record.class.isInstance(o);
  }
}

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