org.eclipse.persistence.queries.AttributeGroup Maven / Gradle / Ivy
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/*
* Copyright (c) 2011, 2021 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// ailitchev - Bug 244124 - Added AttributeGroup base class for nesting
// 09 Jan 2013-2.5 Gordon Yorke
// - 397772: JPA 2.1 Entity Graph Support
package org.eclipse.persistence.queries;
import java.io.Serializable;
import java.util.HashMap;
import java.util.HashSet;
import java.util.IdentityHashMap;
import java.util.Map;
import org.eclipse.persistence.core.queries.CoreAttributeGroup;
import org.eclipse.persistence.descriptors.ClassDescriptor;
import org.eclipse.persistence.internal.queries.AttributeItem;
import org.eclipse.persistence.sessions.CopyGroup;
/**
* Purpose: An AttributeGroup represents a set of mappings and nested
* AttributeGroups for relationship mappings for an entity type.
* Responsibilities:
*
* - Defines which attributes should be fetched from the database within a
* {@link FetchGroup}.
*
- Define which relationship attributes should be populated in a resulting
* entity graph within a {@link LoadGroup}
*
- Define which attributes should be copied within a {@link CopyGroup}
*
*
* To reference nested attributes a dot ('.') notation is used to reference
* related attributes. All attribute names provided are assumed to be correct
* until processed against the mappings during usage of the group.
*
* @see FetchGroup
* @see LoadGroup
* @see CopyGroup
*
* @author ailitchev
* @since EclipseLink 2.1
*/
public class AttributeGroup extends CoreAttributeGroup implements Serializable, Cloneable {
public AttributeGroup(String name) {
this.name = name;
}
/**
* INTERNAL:
* This constructer is to only be used by EclipseLink internally
*/
public AttributeGroup(String name, Class type, boolean isValidated) {
this(name);
this.type = type;
this.isValidated = isValidated;
}
/*
* INTERNAL:
* Used to create an attribute with a name of the class type.
*/
public AttributeGroup(String name, String type, boolean isValidated) {
this(name);
this.typeName = type;
this.isValidated = isValidated;
}
public AttributeGroup() {
this("");
}
/**
* Add a basic attribute or nested attribute with each String representing
* an attribute on the path to what needs to be included in the
* AttributeGroup.
*
* Example:
* group.addAttribute("firstName", group1);
* group.addAttribute("manager.address", group2);
*
*
* Note that existing group corresponding to attributeNameOrPath
* will be overridden with the passed group.
*
* @param attributeNameOrPath
* A simple attribute, array or attributes forming a path
* @param group - an AttributeGroup to be added.
*/
public void addAttribute(String attributeNameOrPath, AttributeGroup group) {
super.addAttribute(attributeNameOrPath, group);
}
/**
* Returns AttributeGroup corresponding to the passed (possibly nested)
* attribute.
*/
@Override
public AttributeGroup getGroup(String attributeNameOrPath) {
return (AttributeGroup)super.getGroup(attributeNameOrPath);
}
/**
* Return true if this AttributeGroup is a super-set of the passed in
* AttributeGroup.
*/
public boolean isSupersetOf(AttributeGroup anotherGroup) {
return super.isSupersetOf(anotherGroup);
}
/**
* INTERNAL:
* Lookup the {@link AttributeItem}for the provided attribute name or path.
*
* @return item or null
* @throws IllegalArgumentException if name is not valid attribute name or path
*/
@Override
public AttributeItem getItem(String attributeNameOrPath) {
return super.getItem(attributeNameOrPath);
}
/**
* Subclass may create different types.
*/
protected AttributeItem newItem(AttributeGroup group, String attrName) {
return new AttributeItem(group, attrName);
}
@Override
public AttributeGroup findGroup(ClassDescriptor type){
return (AttributeGroup)super.findGroup(type);
}
/**
* Convert the group to a FetchGroup for usage with queries.
*/
public FetchGroup toFetchGroup() {
if (isFetchGroup()) {
return (FetchGroup) this;
}
return toFetchGroup(new HashMap<>());
}
/**
* INTERNAL:
* This method is used internally when converting to a copy group.
*/
public FetchGroup toFetchGroup(Map cloneMap){
FetchGroup clone = cloneMap.get(this);
if (clone != null) {
return clone;
}
clone = new FetchGroup(this.name);
clone.type = this.type;
clone.typeName = this.typeName;
clone.isValidated = this.isValidated;
cloneMap.put(this,clone);
if (this.superClassGroup != null){
clone.superClassGroup = ((AttributeGroup)this.superClassGroup).toFetchGroup(cloneMap);
}
if (this.allsubclasses != null){
for (CoreAttributeGroup group : this.allsubclasses.values()){
clone.getSubClassGroups().put(group.getType(), ((AttributeGroup)group).toFetchGroup(cloneMap));
}
}
if (this.subClasses != null){
clone.subClasses = new HashSet<>();
for (CoreAttributeGroup group : this.subClasses){
clone.subClasses.add(((AttributeGroup)group).toFetchGroup(cloneMap));
}
}
// all attributes and nested groups should be cloned, too
clone.items = null;
if (hasItems()) {
clone.items = new HashMap<>();
for (AttributeItem item : this.items.values()){
clone.items.put(item.getAttributeName(), item.toFetchGroup(cloneMap, clone));
}
}
return clone;
}
/**
* INTERNAL:
* This method is used internally when converting to a copy group.
*/
@Override
public boolean isCopyGroup() {
return false;
}
/**
* Convert the group to a CopyGroup for usage with the copy() API.
*/
public CopyGroup toCopyGroup() {
if (isCopyGroup()) {
return (CopyGroup) this;
}
Map cloneMap = new IdentityHashMap<>();
return toCopyGroup(cloneMap, new HashMap<>());
}
/**
* INTERNAL:
* This method is used internally when converting to a copy group.
*/
public CopyGroup toCopyGroup(Map cloneMap, Map copies){
CopyGroup clone = cloneMap.get(this);
if (clone != null) {
return clone;
}
clone = new CopyGroup(this.name);
clone.cascadeTree();
clone.setCopies(copies);
clone.type = this.type;
clone.typeName = this.typeName;
clone.isValidated = this.isValidated;
cloneMap.put(this,clone);
if (this.allsubclasses != null){
for (CoreAttributeGroup group : this.allsubclasses.values()){
clone.getSubClassGroups().put(group.getType(), ((AttributeGroup)group).toCopyGroup(cloneMap, copies));
}
}
if (this.superClassGroup != null){
clone.superClassGroup = ((AttributeGroup)this.superClassGroup).toCopyGroup(cloneMap, copies);
}
if (this.subClasses != null){
clone.subClasses = new HashSet<>();
for (CoreAttributeGroup group : this.subClasses){
clone.subClasses.add(((AttributeGroup)group).toCopyGroup(cloneMap, copies));
}
}
// all attributes and nested groups should be cloned, too
clone.items = null;
if (hasItems()) {
clone.items = new HashMap<>();
for (AttributeItem item : this.items.values()){
clone.items.put(item.getAttributeName(), item.toCopyGroup(cloneMap, clone, copies));
}
}
return clone;
}
@Override
public boolean isLoadGroup() {
return false;
}
/**
* Convert the group to a LoadGroup for usage with queries.
*/
public LoadGroup toLoadGroup() {
if (this.isLoadGroup()) {
return (LoadGroup) this;
}
return toLoadGroup(new HashMap<>(), false);
}
public LoadGroup toLoadGroup(Map cloneMap, boolean loadOnly){
LoadGroup clone = cloneMap.get(this);
if (clone != null) {
return clone;
}
clone = new LoadGroup(this.name);
clone.type = this.type;
clone.typeName = this.typeName;
clone.isValidated = this.isValidated;
cloneMap.put(this,clone);
if (this.allsubclasses != null){
for (CoreAttributeGroup group : this.allsubclasses.values()){
clone.getSubClassGroups().put(group.getType(), ((AttributeGroup)group).toLoadGroup(cloneMap, loadOnly));
}
}
if (this.superClassGroup != null){
clone.superClassGroup = ((AttributeGroup)this.superClassGroup).toLoadGroup(cloneMap, loadOnly);
}
if (this.subClasses != null){
clone.subClasses = new HashSet<>();
for (CoreAttributeGroup group : this.subClasses){
clone.subClasses.add(((AttributeGroup)group).toLoadGroup(cloneMap, loadOnly));
}
}
// all attributes and nested groups should be cloned, too
clone.items = null;
if (hasItems()) {
clone.items = new HashMap<>();
for (AttributeItem item : this.items.values()){
clone.items.put(item.getAttributeName(), item.toLoadGroup(cloneMap, clone, loadOnly));
}
}
return clone;
}
@Override
public AttributeGroup clone() {
return (AttributeGroup)super.clone();
}
/**
* INTERNAL:
* Only LoadGroups allow concurrency.
*/
@Override
public boolean isConcurrent() {
return false;
}
/**
* Subclass may create different types.
*/
@Override
protected AttributeItem newItem(CoreAttributeGroup group, String attrName) {
return new AttributeItem((AttributeGroup)group, attrName);
}
/**
* Subclass may create different types.
*/
@Override
protected AttributeGroup newGroup(String name, CoreAttributeGroup parent) {
return new AttributeGroup(name);
}
}