ORMSimple.java

package fr.tse.fise2.info4.lab11;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;

/**
 * 
 * Complete this class for question
 * 
 * @author you
 * @author Julien Subercaze
 * 
 *
 */
public class ORMSimple {

	/**
	 * Contains the new line characters, for the current OS
	 */
	public static final String LINE_SEPARATOR = System.getProperty("line.separator");
	/**
	 * Tab separator
	 */
	private static final char TAB = '\t';
	/**
	 * To put variables into quotes
	 */
	private static final char SQL_QUOTE = '`';

	/**
	 * 
	 * @param clazz
	 * @return the create statement for MySQL
	 */
	public static String generateTable(Class clazz) {
		int i = 0;
		StringBuilder sb = new StringBuilder();
		List<Field> fields = ReflectionUtils.listFields(clazz);
		sb.append("CREATE TABLE ");
		sb.append(clazz.getSimpleName());
		sb.append(" \n(");
		for (Field f : fields) {
			if (i > 0) {
				sb.append(", ");
			}
			sb.append("\n");
			sb.append(TAB + f.getName() + " ");
			sb.append(convertType(f.getType()));
			i++;
		}
		sb.append("\n);");
		return sb.toString();
	}

	/**
	 * 
	 * @param type
	 * @return the SQL type corresponding to the input type
	 */
	private static String convertType(Class type) {
		if (type.equals(Integer.class)) {
			return "INTEGER";
		} else if (type.equals(String.class)) {
			return "TEXT";
		} else {
			throw new IllegalArgumentException();
		}

	}

	public static String generateInsertStatement(Object obj) throws NoSuchMethodException, SecurityException,
			IllegalAccessException, IllegalArgumentException, InvocationTargetException {
		Class clazz = obj.getClass();
		int i = 0;
		StringBuilder sb = new StringBuilder();
		List<Field> fields = ReflectionUtils.listFields(clazz);
		sb.append("INSERT INTO ");
		sb.append(clazz.getSimpleName());
		sb.append(" (");
		for (Field f : fields) {
			if (i > 0) {
				sb.append(", ");
			}
			sb.append(f.getName());
			i++;
		}
		sb.append(") VALUES (");

		i = 0;
		for (Field f : fields) {
			if (i > 0) {
				sb.append(", ");
			}
			String getterName = "get" + f.getName().substring(0, 1).toUpperCase() + f.getName().substring(1);;
			
			Method fieldGetter = clazz.getMethod(getterName, null);
			String value = fieldGetter.invoke(obj, null).toString();
			sb.append(SQL_QUOTE + value + SQL_QUOTE);
			i++;
		}
		sb.append(")");
		return sb.toString();
	}

	public static void main(String[] args) {
		
		// show create statement
		System.out.println(ORMSimple.generateTable(Car.class));
		
		// show insert statement
//		Car c1 = new Car("peugeot", "205", "2E 234 42", 1997);
//		try {
//			System.out.println(ORMSimple.generateInsertStatement(c1));
//		} catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException
//				| InvocationTargetException e) {
//			e.printStackTrace();
//		}
	}
}