/*
* Copyright 2011, Mysema Ltd
*
* 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 com.mysema.query.sql.dml;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import com.mysema.query.QueryException;
import com.mysema.query.sql.Column;
import com.mysema.query.sql.ColumnMetadata;
import com.mysema.query.sql.RelationalPath;
import com.mysema.query.sql.types.Null;
import com.mysema.query.types.Path;
import com.mysema.util.ReflectionUtils;
/**
* Creates the mapping via @Column annotated fields in the object. Field names don't have to match those in the RelationalPath.
*
* @author tiwe
*
*/
public class AnnotationMapper implements Mapper<Object> {
public static final AnnotationMapper DEFAULT = new AnnotationMapper(false);
public static final AnnotationMapper WITH_NULL_BINDINGS = new AnnotationMapper(true);
private final boolean withNullBindings;
public AnnotationMapper() {
this(false);
}
public AnnotationMapper(boolean withNullBindings) {
this.withNullBindings = withNullBindings;
}
@Override
public Map<Path<?>, Object> createMap(RelationalPath<?> path, Object object) {
try {
Map<String, Path<?>> columnToPath = new HashMap<String, Path<?>>();
for (Path<?> column : path.getColumns()) {
columnToPath.put(ColumnMetadata.getName(column), column);
}
Map<Path<?>, Object> values = new HashMap<Path<?>, Object>();
for (Field field : ReflectionUtils.getFields(object.getClass())) {
Column ann = field.getAnnotation(Column.class);
if (ann != null) {
field.setAccessible(true);
Object propertyValue = field.get(object);
if (propertyValue != null) {
if (columnToPath.containsKey(ann.value())) {
values.put(columnToPath.get(ann.value()), propertyValue);
}
} else if (withNullBindings) {
values.put(columnToPath.get(ann.value()), Null.DEFAULT);
}
}
}
return values;
} catch (IllegalAccessException e) {
throw new QueryException(e);
}
}
}