com.impetus.kundera.utils.ObjectUtils Maven / Gradle / Ivy
/**
* Copyright 2012 Impetus Infotech.
*
* 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.impetus.kundera.utils;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.Attribute.PersistentAttributeType;
import javax.persistence.metamodel.EmbeddableType;
import javax.persistence.metamodel.EntityType;
import javax.persistence.metamodel.Type.PersistenceType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.impetus.kundera.metadata.KunderaMetadataManager;
import com.impetus.kundera.metadata.model.EntityMetadata;
import com.impetus.kundera.metadata.model.MetamodelImpl;
import com.impetus.kundera.metadata.model.Relation;
import com.impetus.kundera.metadata.model.attributes.AbstractAttribute;
import com.impetus.kundera.persistence.EntityManagerFactoryImpl.KunderaMetadata;
import com.impetus.kundera.property.PropertyAccessor;
import com.impetus.kundera.property.PropertyAccessorFactory;
import com.impetus.kundera.property.PropertyAccessorHelper;
import com.impetus.kundera.proxy.KunderaProxy;
import com.impetus.kundera.proxy.ProxyHelper;
import com.impetus.kundera.proxy.collection.ProxyCollection;
/**
* Provides utility methods for operation on objects.
*
* @author amresh.singh
*/
public class ObjectUtils
{
/** The log. */
private static Logger log = LoggerFactory.getLogger(ObjectUtils.class);
/**
* Deep copy.
*
* @param source
* the source
* @param kunderaMetadata
* the kundera metadata
* @return the object
*/
public static final Object deepCopy(Object source, final KunderaMetadata kunderaMetadata)
{
Map copiedObjectMap = new HashMap();
Object target = deepCopyUsingMetadata(source, copiedObjectMap, kunderaMetadata);
copiedObjectMap.clear();
copiedObjectMap = null;
return target;
}
/**
* Deep copy using metadata.
*
* @param source
* the source
* @param copiedObjectMap
* the copied object map
* @param kunderaMetadata
* the kundera metadata
* @return the object
*/
private static Object deepCopyUsingMetadata(Object source, Map copiedObjectMap,
final KunderaMetadata kunderaMetadata)
{
Object target = null;
try
{
if (source == null)
{
return null;
}
Class sourceObjectClass = source.getClass();
EntityMetadata metadata = KunderaMetadataManager.getEntityMetadata(kunderaMetadata, sourceObjectClass);
if (metadata == null)
{
return source;
}
MetamodelImpl metaModel = (MetamodelImpl) kunderaMetadata.getApplicationMetadata().getMetamodel(
metadata.getPersistenceUnit());
EntityType entityType = metaModel.entity(sourceObjectClass);
// May break for mapped super class.
Object id = null;
if (metadata.getRelations() != null && !metadata.getRelations().isEmpty())
{
id = PropertyAccessorHelper.getId(source, metadata);
StringBuilder keyBuilder = new StringBuilder(sourceObjectClass.getName());
keyBuilder.append("#");
keyBuilder.append(id);
Object copiedObjectInMap = copiedObjectMap.get(keyBuilder.toString());
if (copiedObjectInMap != null)
{
return copiedObjectInMap;
}
}
// Copy Columns (in a table that doesn't have any embedded objects
target = KunderaCoreUtils.createNewInstance(sourceObjectClass);
Iterator iter = entityType.getAttributes().iterator();
while (iter.hasNext())
{
Attribute attrib = iter.next();
Field columnField = (Field) attrib.getJavaMember();
if (attrib.getPersistentAttributeType().equals(PersistentAttributeType.EMBEDDED)
|| attrib.getPersistentAttributeType().equals(PersistentAttributeType.ELEMENT_COLLECTION))
{
EmbeddableType embeddedColumn = metaModel.embeddable(((AbstractAttribute) attrib)
.getBindableJavaType());
Object sourceEmbeddedObj = PropertyAccessorHelper.getObject(source, columnField);
if (sourceEmbeddedObj != null)
{
if (metaModel.isEmbeddable(((AbstractAttribute) attrib).getBindableJavaType()))
{
if (attrib.isCollection())
{
Class ecDeclaredClass = columnField.getType();
Class actualEcObjectClass = sourceEmbeddedObj.getClass();
Object targetCollectionObject = actualEcObjectClass.newInstance();
// Copy element collections for List and Set
if (sourceEmbeddedObj instanceof Collection)
{
Class genericClass = PropertyAccessorHelper.getGenericClass(columnField);
for (Object sourceEcObj : (Collection) sourceEmbeddedObj)
{
Object targetEcObj = null;
if (sourceEcObj != null
&& PersistenceType.BASIC.equals(embeddedColumn.getPersistenceType()))
{
PropertyAccessor accessor = PropertyAccessorFactory
.getPropertyAccessor(sourceEcObj.getClass());
if (accessor != null)
{
targetEcObj = accessor.getCopy(sourceEcObj);
}
}
else if (sourceEcObj != null
&& PersistenceType.EMBEDDABLE.equals(embeddedColumn
.getPersistenceType()))
{
targetEcObj = genericClass.newInstance();
for (Field f : genericClass.getDeclaredFields())
{
if (f != null && !Modifier.isStatic(f.getModifiers()))
{
PropertyAccessorHelper.set(targetEcObj, f,
PropertyAccessorHelper.getObjectCopy(sourceEcObj, f));
}
}
}
if (List.class.isAssignableFrom(ecDeclaredClass))
{
Method m = actualEcObjectClass.getMethod("add", Object.class);
m.invoke(targetCollectionObject, targetEcObj);
}
else if (Set.class.isAssignableFrom(ecDeclaredClass))
{
Method m = actualEcObjectClass.getMethod("add", Object.class);
m.invoke(targetCollectionObject, targetEcObj);
}
}
}
// Copy element collection for Map
else if (sourceEmbeddedObj instanceof Map)
{
for (Object sourceKey : ((Map) sourceEmbeddedObj).keySet())
{
Object targetKey = null;
Object targetValue = null;
if (PersistenceType.BASIC.equals(embeddedColumn.getPersistenceType())
|| PersistenceType.EMBEDDABLE.equals(embeddedColumn
.getPersistenceType()))
{
// Create copy of map key
if (sourceKey != null)
{
PropertyAccessor keyAccessor = PropertyAccessorFactory
.getPropertyAccessor(sourceKey.getClass());
if (keyAccessor != null)
{
targetKey = keyAccessor.getCopy(sourceKey);
}
}
else
{
targetKey = null;
}
// Create copy of map value
Object sourceValue = ((Map) sourceEmbeddedObj).get(sourceKey);
if (sourceValue != null)
{
PropertyAccessor valueAccessor = PropertyAccessorFactory
.getPropertyAccessor(sourceValue.getClass());
if (valueAccessor != null)
{
targetValue = valueAccessor.getCopy(sourceValue);
}
}
else
{
targetValue = null;
}
if (Map.class.isAssignableFrom(ecDeclaredClass))
{
Method m = actualEcObjectClass.getMethod("put", new Class[] {
Object.class, Object.class });
m.invoke(targetCollectionObject,
new Object[] { targetKey, targetValue });
}
}
}
}
PropertyAccessorHelper.set(target, columnField, targetCollectionObject);
}
else
{
// Copy embedded objects
Class embeddedColumnClass = columnField.getType();
Object targetEmbeddedObj = embeddedColumnClass.newInstance();
Set columns = embeddedColumn.getAttributes();
for (Attribute column : columns)
{
PropertyAccessorHelper.set(
targetEmbeddedObj,
(Field) column.getJavaMember(),
PropertyAccessorHelper.getObjectCopy(sourceEmbeddedObj,
(Field) column.getJavaMember()));
}
PropertyAccessorHelper.set(target, columnField, targetEmbeddedObj);
}
}
else if (((AbstractAttribute) attrib).getJPAColumnName() != null)
{
// Copy columns
PropertyAccessorHelper.set(target, columnField, sourceEmbeddedObj);
}
}
}
else if (attrib.getPersistentAttributeType().equals(PersistentAttributeType.BASIC))
{
PropertyAccessorHelper.set(target, columnField,
PropertyAccessorHelper.getObjectCopy(source, columnField));
}
}
// Put this object into copied object map
if (id != null)
{
StringBuilder keyBuilder = new StringBuilder(sourceObjectClass.getName());
keyBuilder.append("#");
keyBuilder.append(id);
copiedObjectMap.put(keyBuilder.toString(), target);
}
// Copy Relationships recursively
for (Relation relation : metadata.getRelations())
{
if (relation != null)
{
Field relationField = relation.getProperty();
Object sourceRelationObject = PropertyAccessorHelper.getObject(source, relationField);
if (sourceRelationObject != null)
{
if (sourceRelationObject instanceof KunderaProxy)
{
PropertyAccessorHelper.set(target, relationField, sourceRelationObject);
continue;
}
else if (ProxyHelper.isPersistentCollection(sourceRelationObject))
{
PropertyAccessorHelper.set(target, relationField, sourceRelationObject);
continue;
}
else if (ProxyHelper.isKunderaProxyCollection(sourceRelationObject))
{
ProxyCollection pc = ((ProxyCollection) sourceRelationObject).getCopy();
pc.setOwner(target);
PropertyAccessorHelper.set(target, relationField, pc);
continue;
}
Object targetRelationObject = null;
Class relationObjectClass = relation.getProperty().getType();
Class actualRelationObjectClass = sourceRelationObject.getClass();
if (Collection.class.isAssignableFrom(relationObjectClass))
{
targetRelationObject = actualRelationObjectClass.newInstance();
Method m = actualRelationObjectClass.getMethod("add", Object.class);
for (Object obj : (Collection) sourceRelationObject)
{
Object copyTargetRelObj = searchInCacheThenCopy(copiedObjectMap, obj, kunderaMetadata);
m.invoke(targetRelationObject, copyTargetRelObj);
}
}
else if (Map.class.isAssignableFrom(relationObjectClass))
{
targetRelationObject = actualRelationObjectClass.newInstance();
Method m = actualRelationObjectClass.getMethod("put", new Class[] { Object.class,
Object.class });
for (Object keyObj : ((Map) sourceRelationObject).keySet())
{
Object valObj = ((Map) sourceRelationObject).get(keyObj);
Object copyTargetKeyObj = searchInCacheThenCopy(copiedObjectMap, keyObj,
kunderaMetadata);
Object copyTargetValueObj = searchInCacheThenCopy(copiedObjectMap, valObj,
kunderaMetadata);
m.invoke(targetRelationObject, new Object[] { copyTargetKeyObj, copyTargetValueObj });
}
}
else
{
targetRelationObject = searchInCacheThenCopy(copiedObjectMap, sourceRelationObject,
kunderaMetadata);
}
PropertyAccessorHelper.set(target, relationField, targetRelationObject);
}
}
}
}
catch (InstantiationException e)
{
log.warn("Error while instantiating entity/ embeddable class, did you define no-arg constructor?, Caused by:"
+ e.getMessage());
return null;
}
catch (Exception e)
{
log.warn("Returning null as error during clone, Caused by:" + e.getMessage());
return null;
}
return target;
}
/**
* Search in cache then copy.
*
* @param copiedObjectMap
* the copied object map
* @param sourceObject
* the source object
* @param kunderaMetadata
* the kundera metadata
* @return the object
*/
private static Object searchInCacheThenCopy(Map copiedObjectMap, Object sourceObject,
final KunderaMetadata kunderaMetadata)
{
Object copyTargetRelObj = null;
copyTargetRelObj = deepCopyUsingMetadata(sourceObject, copiedObjectMap, kunderaMetadata);
return copyTargetRelObj;
}
/**
* Gets the field instance.
*
* @param chids
* the chids
* @param f
* the f
* @return the field instance
*/
public static Object getFieldInstance(List chids, Field f)
{
if (Set.class.isAssignableFrom(f.getType()))
{
Set col = new HashSet(chids);
return col;
}
return chids;
}
}
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