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/*-
* ============LICENSE_START=======================================================
* org.openecomp.aai
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.aai.util;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Date;
import com.sun.tools.javac.util.List;
//SWGK - 01/08/2016 - Helper function to deal with concurrency control
public class MergeResource {
//Merge Assumptions:
//fromresource and toresource are the same resource type and same resource object
//fromresource is the latest version from the DB
//toresource is the version of the same resource with updates
//merging of child elements are complete overwrite of fromresource corresponding child element
//merging of relationshiplist is complete overwrite of fromresource corresponding releationship element
//In case of supplying the only specific child element update, please specify the child element type (need not be in canonical form)
//For parent only update (not involving child or relationship element update), then all the child elements and relationship list will be set as null in the merged object
//For setting null to primitive type (including String) you have to do it after the merge is called specifically for parent only copy
/**
* Merge.
*
* @param <T> the generic type
* @param fromresource the fromresource
* @param toresource the toresource
* @param bupdateChildren the bupdate children
* @param childNamelist the child namelist
* @param bupdateRelatedLink the bupdate related link
* @return the t
*/
public static <T> T merge(T fromresource, T toresource, boolean bupdateChildren, String childNamelist[], boolean bupdateRelatedLink)
{
Field[] fields = fromresource.getClass().getDeclaredFields();
if (fields != null)
{
for (Field field : fields)
{
try
{
field.setAccessible(true);
if ( field.getName().equalsIgnoreCase("resourceVersion") )
continue;
if ( isValidMergeType(field.getType()) )
{
Object obj = field.get(toresource);
// If the updated resource's any property to be set null then one has to set it separately for the merged object
if (obj != null)
field.set(fromresource, obj);
continue;
}
else
// set the child list or relatedTo link to be null so no updates takes place
field.set(fromresource, null);
//override situation
if (bupdateChildren || bupdateRelatedLink)
{
if (bupdateRelatedLink && field.getName().equalsIgnoreCase("relationshipList"))
{
Object obj = field.get(toresource);
field.set(fromresource, obj);
continue;
}
if (field.getName().equalsIgnoreCase("relationshipList"))
if (!bupdateRelatedLink)
continue;
// not an efficient as it blindly updates all children - onus is on callee to nullify
// specific child(ren) that they don't want to update after the merge call.
// can be optimized to send a list of children class names in canonical form
// but deferring for next release so that only those children can be merged
if (bupdateChildren && (childNamelist != null))
{
for (String classStringName : childNamelist)
{
if ( !classStringName.isEmpty() && field.getType().toString().toLowerCase().endsWith(classStringName.toLowerCase()) )
{
Object obj = field.get(toresource);
field.set(fromresource, obj);
}
}
continue;
}
if (bupdateChildren && (childNamelist == null))
{
Object obj = field.get(toresource);
field.set(fromresource, obj);
}
}
}
catch (Exception e)
{
}
}
}
return fromresource;
}
/**
* Merge.
*
* @param <T> the generic type
* @param fromresource the fromresource
* @param toresource the toresource
* @return the t
*/
public static <T> T merge(T fromresource, T toresource)
{
return merge(fromresource, toresource, false, false);
}
/**
* Merge.
*
* @param <T> the generic type
* @param fromresource the fromresource
* @param toresource the toresource
* @param bupdateChildren the bupdate children
* @param bupdateRelatedLink the bupdate related link
* @return the t
*/
public static <T> T merge(T fromresource, T toresource, boolean bupdateChildren, boolean bupdateRelatedLink)
{
return merge(fromresource, toresource, bupdateChildren, null, bupdateRelatedLink);
}
/**
* Checks if is valid merge type.
*
* @param fieldType the field type
* @return true, if is valid merge type
*/
public static boolean isValidMergeType(Class<?> fieldType) {
if (fieldType.equals(String.class)) {
return true;
} else if (Date.class.isAssignableFrom(fieldType)) {
return true;
} else if (Number.class.isAssignableFrom(fieldType)) {
return true;
} else if (fieldType.equals(Integer.TYPE)) {
return true;
} else if (fieldType.equals(Long.TYPE)) {
return true;
} else if (Enum.class.isAssignableFrom(fieldType)) {
return true;
} else if (Boolean.class.isAssignableFrom(fieldType)) {
return true;
}
else {
return false;
}
}
/**
* Gets the child return type.
*
* @param classname the classname
* @param methodname the methodname
* @return the class
*/
public static Class<?> GetChildReturnType(String classname, String methodname)
{
try {
Class<?> c = Class.forName(classname);
Method[] allMethods = c.getDeclaredMethods();
for (Method m : allMethods) {
if (!m.getName().equals(methodname)) {
return m.getReturnType();
}
}
} catch (ClassNotFoundException x) {
}
return null;
}
}
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