/*
* Copyright 2004-2007 Brian McCallister
*
* 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 org.skife.jdbi.v2;
import org.skife.jdbi.v2.tweak.ResultSetMapper;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.math.BigDecimal;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
* A result set mapper which maps the fields in a statement into a JavaBean. This uses
* the JDK's built in bean mapping facilities, so it does not support nested properties.
*/
public class BeanMapper<T> implements ResultSetMapper<T>
{
private final Class<T> type;
private final Map<String, PropertyDescriptor> properties = new HashMap<String, PropertyDescriptor>();
public BeanMapper(Class<T> type)
{
this.type = type;
try
{
BeanInfo info = Introspector.getBeanInfo(type);
for (PropertyDescriptor descriptor : info.getPropertyDescriptors())
{
properties.put(descriptor.getName().toLowerCase(), descriptor);
}
}
catch (IntrospectionException e)
{
throw new IllegalArgumentException(e);
}
}
public T map(int row, ResultSet rs, StatementContext ctx)
throws SQLException
{
T bean;
try
{
bean = type.newInstance();
}
catch (Exception e)
{
throw new IllegalArgumentException(String.format("A bean, %s, was mapped " +
"which was not instantiable", type.getName()),
e);
}
ResultSetMetaData metadata = rs.getMetaData();
for (int i = 1; i <= metadata.getColumnCount(); ++i) {
String name = metadata.getColumnName(i).toLowerCase();
PropertyDescriptor descriptor = properties.get(name);
if (descriptor != null) {
Class type = descriptor.getPropertyType();
Object value;
if (type.isAssignableFrom(Boolean.class) || type.isAssignableFrom(boolean.class)) {
value = rs.getBoolean(i);
}
else if (type.isAssignableFrom(Byte.class) || type.isAssignableFrom(byte.class)) {
value = rs.getByte(i);
}
else if (type.isAssignableFrom(Short.class) || type.isAssignableFrom(short.class)) {
value = rs.getShort(i);
}
else if (type.isAssignableFrom(Integer.class) || type.isAssignableFrom(int.class)) {
value = rs.getInt(i);
}
else if (type.isAssignableFrom(Long.class) || type.isAssignableFrom(long.class)) {
value = rs.getLong(i);
}
else if (type.isAssignableFrom(Float.class) || type.isAssignableFrom(float.class)) {
value = rs.getFloat(i);
}
else if (type.isAssignableFrom(Double.class) || type.isAssignableFrom(double.class)) {
value = rs.getDouble(i);
}
else if (type.isAssignableFrom(BigDecimal.class)) {
value = rs.getBigDecimal(i);
}
else if (type.isAssignableFrom(Timestamp.class)) {
value = rs.getTimestamp(i);
}
else if (type.isAssignableFrom(Time.class)) {
value = rs.getTime(i);
}
else if (type.isAssignableFrom(Date.class)) {
value = rs.getDate(i);
}
else if (type.isAssignableFrom(String.class)) {
value = rs.getString(i);
}
else {
value = rs.getObject(i);
}
if (rs.wasNull() && !type.isPrimitive()) {
value = null;
}
try
{
descriptor.getWriteMethod().invoke(bean, value);
}
catch (IllegalAccessException e)
{
throw new IllegalArgumentException(String.format("Unable to access setter for " +
"property, %s", name), e);
}
catch (InvocationTargetException e)
{
throw new IllegalArgumentException(String.format("Invocation target exception trying to " +
"invoker setter for the %s property", name), e);
}
}
}
return bean;
}
}