org.killbill.commons.jdbi.mapper.LowerToCamelBeanMapper Maven / Gradle / Ivy
/*
* Copyright 2010-2012 Ning, Inc.
*
* Ning licenses this file to you 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.killbill.commons.jdbi.mapper;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.sql.Blob;
import java.sql.Date;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Map;
import java.util.TimeZone;
import java.util.UUID;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.LocalDate;
import org.skife.jdbi.v2.StatementContext;
import org.skife.jdbi.v2.tweak.ResultSetMapper;
import com.google.common.base.CaseFormat;
// Identical to org.skife.jdbi.v2.BeanMapper but maps created_date to createdDate
public class LowerToCamelBeanMapper implements ResultSetMapper {
private final Class type;
private final Map properties = new HashMap();
public LowerToCamelBeanMapper(final Class type) {
this.type = type;
try {
final BeanInfo info = Introspector.getBeanInfo(type);
for (final PropertyDescriptor descriptor : info.getPropertyDescriptors()) {
properties.put(CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, descriptor.getName()).toLowerCase(), descriptor);
}
} catch (final IntrospectionException e) {
throw new IllegalArgumentException(e);
}
}
public T map(final int row, final ResultSet rs, final StatementContext ctx) throws SQLException {
final T bean;
try {
bean = type.newInstance();
} catch (final Exception e) {
throw new IllegalArgumentException(String.format("A bean, %s, was mapped " +
"which was not instantiable", type.getName()),
e);
}
final Class beanClass = bean.getClass();
final ResultSetMetaData metadata = rs.getMetaData();
for (int i = 1; i <= metadata.getColumnCount(); ++i) {
final String name = metadata.getColumnLabel(i).toLowerCase();
final PropertyDescriptor descriptor = properties.get(name);
if (descriptor != null) {
final 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(DateTime.class)) {
final Timestamp timestamp = rs.getTimestamp(i);
value = timestamp == null ? null : new DateTime(timestamp).toDateTime(DateTimeZone.UTC);
} else if (type.isAssignableFrom(Time.class)) {
value = rs.getTime(i);
} else if (type.isAssignableFrom(LocalDate.class)) {
//
// We store the LocalDate into a mysql 'date' as a string
// (See https://github.com/killbill/killbill-commons/blob/master/jdbi/src/main/java/org/killbill/commons/jdbi/argument/LocalDateArgumentFactory.java)
// So we also read it as a String which avoids any kind of transformation
//
// Note that we used previously the getDate(index, Calendar) method, but this is not thread safe as we discovered
// unless maybe -- untested --we pass a new instance of a Calendar each time
//
final String dateString = rs.getString(i);
value = dateString == null ? null : new LocalDate(dateString, DateTimeZone.UTC);
} else if (type.isAssignableFrom(DateTimeZone.class)) {
final String dateTimeZoneString = rs.getString(i);
value = dateTimeZoneString == null ? null : DateTimeZone.forID(dateTimeZoneString);
} else if (type.isAssignableFrom(String.class)) {
value = rs.getString(i);
} else if (type.isAssignableFrom(UUID.class)) {
final String uuidString = rs.getString(i);
value = uuidString == null ? null : UUID.fromString(uuidString);
} else if (type.isEnum()) {
final String enumString = rs.getString(i);
//noinspection unchecked
value = enumString == null ? null : Enum.valueOf((Class) type, enumString);
} else if (type == byte[].class) {
value = rs.getBytes(i);
} else {
value = rs.getObject(i);
}
// For h2, transform a JdbcBlob into a byte[]
if (value instanceof Blob) {
final Blob blob = (Blob) value;
value = blob.getBytes(0, (int) blob.length());
}
if (rs.wasNull() && !type.isPrimitive()) {
value = null;
}
try {
final Method writeMethod = descriptor.getWriteMethod();
if (writeMethod != null) {
writeMethod.invoke(bean, value);
} else {
final String camelCasedName = CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, name);
final Field field = getField(beanClass, camelCasedName);
field.setAccessible(true); // Often private...
field.set(bean, value);
}
} catch (final NoSuchFieldException e) {
throw new IllegalArgumentException(String.format("Unable to find field for " +
"property, %s", name), e);
} catch (final IllegalAccessException e) {
throw new IllegalArgumentException(String.format("Unable to access setter for " +
"property, %s", name), e);
} catch (final InvocationTargetException e) {
throw new IllegalArgumentException(String.format("Invocation target exception trying to " +
"invoker setter for the %s property", name), e);
} catch (final NullPointerException e) {
throw new IllegalArgumentException(String.format("No appropriate method to " +
"write value %s ", value.toString()), e);
}
}
}
return bean;
}
private static Field getField(final Class clazz, final String fieldName) throws NoSuchFieldException {
try {
return clazz.getDeclaredField(fieldName);
} catch (final NoSuchFieldException e) {
// Go up in the hierarchy
final Class superClass = clazz.getSuperclass();
if (superClass == null) {
throw e;
} else {
return getField(superClass, fieldName);
}
}
}
}
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