FJ-57 Ex 4.9 Item 9

AlunoDAO.java

package br.com.caelum.cadastro.dao;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import br.com.caelum.cadastro.modelo.Aluno;

public class AlunoDAO extends SQLiteOpenHelper {

    private static final int VERSAO = 1;
    private static final String TABELA = "Alunos";
    private static final String DATABASE = "CadastroCaelum";

    public AlunoDAO(Context context) {
        super(context, DATABASE, null, VERSAO);
    }

    @Override
    public void onCreate(SQLiteDatabase database) {
        String ddl = "CREATE TABLE " + TABELA
                + " (id INTEGER PRIMARY KEY, "
                + " nome TEXT NOT NULL, "
                + " telefone TEXT, "
                + " endereco TEXT, "
                + " site TEXT, "
                + " nota REAL);";
        database.execSQL(ddl);
    }

    @Override
    public void onUpgrade(SQLiteDatabase database,
                          int versaoAntiga, int versaoNova) {
        String sql = "DROP TABLE IF EXISTS " + TABELA;
        database.execSQL(sql);
        onCreate(database);
    }

    public void insere(Aluno aluno) {
        ContentValues values = new ContentValues();

        values.put("nome", aluno.getNome());
        values.put("telefone", aluno.getTelefone());
        values.put("endereco", aluno.getEndereco());
        values.put("site", aluno.getSite());
        values.put("nota", aluno.getNota());

        getWritableDatabase().insert(TABELA, null, values);
    }

    public List<Aluno> getLista() {
        List<Aluno> alunos = new ArrayList<Aluno>();
        SQLiteDatabase db = getReadableDatabase();
        Cursor c = db.rawQuery("SELECT * FROM " + TABELA + ";", null);
        while (c.moveToNext()) {
            Aluno aluno = new Aluno();
//            aluno.setId(c.getLong(c.getColumnIndex("id")));
//            aluno.setNome(c.getString(c.getColumnIndex("nome")));
//            aluno.setTelefone(c.getString(c.getColumnIndex("telefone")));
//            aluno.setEndereco(c.getString(c.getColumnIndex("endereco")));
//            aluno.setSite(c.getString(c.getColumnIndex("site")));
//            aluno.setNota(c.getDouble(c.getColumnIndex("nota")));
            for (String field : c.getColumnNames()) {
                set(aluno, field, c);
            }

            alunos.add(aluno);
        }
        c.close();
        return alunos;
    }

    private boolean set(Object object, String fieldName, Cursor c) {
        Class<?> clazz = object.getClass();
        while (clazz != null) {
            try {
                Field field = clazz.getDeclaredField(fieldName);
                field.setAccessible(true);
                if(field.getType().isAssignableFrom(Integer.class)) {
                    field.set(object, c.getInt(c.getColumnIndex(fieldName)));
                } else if(field.getType().isAssignableFrom(Long.class)) {
                    field.set(object, c.getLong(c.getColumnIndex(fieldName)));
                } else if(field.getType().isAssignableFrom(String.class)) {
                    field.set(object, c.getString(c.getColumnIndex(fieldName)));
                } else if(field.getType().isAssignableFrom(Double.class)) {
                    field.set(object, c.getDouble(c.getColumnIndex(fieldName)));
                }
                return true;
            } catch (NoSuchFieldException e) {
                clazz = clazz.getSuperclass();
            } catch (Exception e) {
                throw new IllegalStateException(e);
            }
        }
        return false;
    }
}