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/*-
* Copyright (C) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
*
* This file was distributed by Oracle as part of a version of Oracle Berkeley
* DB Java Edition made available at:
*
* http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html
*
* Please see the LICENSE file included in the top-level directory of the
* appropriate version of Oracle Berkeley DB Java Edition for a copy of the
* license and additional information.
*/
package com.sleepycat.persist.model;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import com.sleepycat.compat.DbCompat;
/**
* The default annotation-based entity model. An AnnotationModel
* is based on annotations that are specified for entity classes and their key
* fields.
*
* {@code AnnotationModel} objects are thread-safe. Multiple threads may
* safely call the methods of a shared {@code AnnotationModel} object.
*
* The set of persistent classes in the annotation model is the set of all
* classes with the {@link Persistent} or {@link Entity} annotation.
*
* The annotations used to define persistent classes are: {@link Entity},
* {@link Persistent}, {@link PrimaryKey}, {@link SecondaryKey} and {@link
* KeyField}. A good starting point is {@link Entity}.
*
* @author Mark Hayes
*/
public class AnnotationModel extends EntityModel {
private static class EntityInfo {
PrimaryKeyMetadata priKey;
Map secKeys =
new HashMap();
}
private Map classMap;
private Map entityMap;
/*
* This set records the special classes, i.e., enum and array type.
* [#19377]
*/
private Set registeredSpecialClasses;
/**
* Constructs a model for annotated entity classes.
*/
public AnnotationModel() {
super();
classMap = new HashMap();
entityMap = new HashMap();
registeredSpecialClasses = new HashSet();
}
/* EntityModel methods */
@Override
public synchronized Set getKnownClasses() {
return Collections.unmodifiableSet
(new HashSet(classMap.keySet()));
}
@Override
public Set getKnownSpecialClasses() {
return Collections.unmodifiableSet(registeredSpecialClasses);
}
@Override
public synchronized EntityMetadata getEntityMetadata(String className) {
/* Call getClassMetadata to collect metadata. */
getClassMetadata(className);
/* Return the collected entity metadata. */
EntityInfo info = entityMap.get(className);
if (info != null) {
return new EntityMetadata
(className, info.priKey,
Collections.unmodifiableMap(info.secKeys));
} else {
return null;
}
}
@Override
public synchronized ClassMetadata getClassMetadata(String className) {
ClassMetadata metadata = classMap.get(className);
if (metadata == null) {
Class type;
try {
type = resolveClass(className);
} catch (ClassNotFoundException e) {
return null;
}
/*
* Adds enum or array types to registeredSpecialClasses set, and
* does not create metadata for them. [#19377]
*/
if (type.isEnum() ||
type.isArray()) {
registeredSpecialClasses.add(className);
}
/* Get class annotation. */
Entity entity = type.getAnnotation(Entity.class);
Persistent persistent = type.getAnnotation(Persistent.class);
if (entity == null && persistent == null) {
return null;
}
if (type.isEnum() ||
type.isInterface() ||
type.isPrimitive()) {
throw new IllegalArgumentException
("@Entity and @Persistent not allowed for enum, " +
"interface, or primitive type: " + type.getName());
}
if (entity != null && persistent != null) {
throw new IllegalArgumentException
("Both @Entity and @Persistent are not allowed: " +
type.getName());
}
boolean isEntity;
int version;
String proxiedClassName;
if (entity != null) {
isEntity = true;
version = entity.version();
proxiedClassName = null;
} else {
isEntity = false;
version = persistent.version();
Class proxiedClass = persistent.proxyFor();
proxiedClassName = (proxiedClass != void.class) ?
proxiedClass.getName() : null;
}
/* Get instance fields. */
List fields = new ArrayList();
boolean nonDefaultRules = getInstanceFields(fields, type);
Collection nonDefaultFields = null;
if (nonDefaultRules) {
nonDefaultFields = new ArrayList(fields.size());
for (Field field : fields) {
nonDefaultFields.add(new FieldMetadata
(field.getName(), field.getType().getName(),
type.getName()));
}
nonDefaultFields =
Collections.unmodifiableCollection(nonDefaultFields);
}
/* Get the rest of the metadata and save it. */
metadata = new ClassMetadata
(className, version, proxiedClassName, isEntity,
getPrimaryKey(type, fields),
getSecondaryKeys(type, fields),
getCompositeKeyFields(type, fields),
nonDefaultFields);
classMap.put(className, metadata);
/* Add any new information about entities. */
updateEntityInfo(metadata);
}
return metadata;
}
/**
* Fills in the fields array and returns true if the default rules for
* field persistence were overridden.
*/
private boolean getInstanceFields(List fields, Class type) {
boolean nonDefaultRules = false;
for (Field field : type.getDeclaredFields()) {
boolean notPersistent =
(field.getAnnotation(NotPersistent.class) != null);
boolean notTransient =
(field.getAnnotation(NotTransient.class) != null);
if (notPersistent && notTransient) {
throw new IllegalArgumentException
("Both @NotTransient and @NotPersistent not allowed");
}
if (notPersistent || notTransient) {
nonDefaultRules = true;
}
int mods = field.getModifiers();
if (!Modifier.isStatic(mods) &&
!notPersistent &&
(!Modifier.isTransient(mods) || notTransient)) {
/* Field is DPL persistent. */
fields.add(field);
} else {
/* If non-persistent, no other annotations should be used. */
if (field.getAnnotation(PrimaryKey.class) != null ||
field.getAnnotation(SecondaryKey.class) != null ||
field.getAnnotation(KeyField.class) != null) {
throw new IllegalArgumentException
("@PrimaryKey, @SecondaryKey and @KeyField not " +
"allowed on non-persistent field");
}
}
}
return nonDefaultRules;
}
private PrimaryKeyMetadata getPrimaryKey(Class type,
List fields) {
Field foundField = null;
String sequence = null;
for (Field field : fields) {
PrimaryKey priKey = field.getAnnotation(PrimaryKey.class);
if (priKey != null) {
if (foundField != null) {
throw new IllegalArgumentException
("Only one @PrimaryKey allowed: " + type.getName());
} else {
foundField = field;
sequence = priKey.sequence();
if (sequence.length() == 0) {
sequence = null;
}
}
}
}
if (foundField != null) {
return new PrimaryKeyMetadata
(foundField.getName(), foundField.getType().getName(),
type.getName(), sequence);
} else {
return null;
}
}
private Map
getSecondaryKeys(Class type, List fields) {
Map map = null;
for (Field field : fields) {
SecondaryKey secKey = field.getAnnotation(SecondaryKey.class);
if (secKey != null) {
Relationship rel = secKey.relate();
String elemClassName = null;
if (rel == Relationship.ONE_TO_MANY ||
rel == Relationship.MANY_TO_MANY) {
elemClassName = getElementClass(field);
}
String keyName = secKey.name();
if (keyName.length() == 0) {
keyName = field.getName();
}
Class relatedClass = secKey.relatedEntity();
String relatedEntity = (relatedClass != void.class) ?
relatedClass.getName() : null;
DeleteAction deleteAction = (relatedEntity != null) ?
secKey.onRelatedEntityDelete() : null;
SecondaryKeyMetadata metadata = new SecondaryKeyMetadata
(field.getName(), field.getType().getName(),
type.getName(), elemClassName, keyName, rel,
relatedEntity, deleteAction);
if (map == null) {
map = new HashMap();
}
if (map.put(keyName, metadata) != null) {
throw new IllegalArgumentException
("Only one @SecondaryKey with the same name allowed: "
+ type.getName() + '.' + keyName);
}
}
}
if (map != null) {
map = Collections.unmodifiableMap(map);
}
return map;
}
private String getElementClass(Field field) {
Class cls = field.getType();
if (cls.isArray()) {
return cls.getComponentType().getName();
}
if (Collection.class.isAssignableFrom(cls)) {
Type[] typeArgs = null;
if (field.getGenericType() instanceof ParameterizedType) {
typeArgs = ((ParameterizedType) field.getGenericType()).
getActualTypeArguments();
}
if (typeArgs == null ||
typeArgs.length != 1 ||
!(typeArgs[0] instanceof Class)) {
throw new IllegalArgumentException
("Collection typed secondary key field must have a" +
" single generic type argument and a wildcard or" +
" type bound is not allowed: " +
field.getDeclaringClass().getName() + '.' +
field.getName());
}
return ((Class) typeArgs[0]).getName();
}
throw new IllegalArgumentException
("ONE_TO_MANY or MANY_TO_MANY secondary key field must have" +
" an array or Collection type: " +
field.getDeclaringClass().getName() + '.' + field.getName());
}
private List getCompositeKeyFields(Class type,
List fields) {
List list = null;
for (Field field : fields) {
KeyField keyField = field.getAnnotation(KeyField.class);
if (keyField != null) {
int value = keyField.value();
if (value < 1 || value > fields.size()) {
throw new IllegalArgumentException
("Unreasonable @KeyField index value " + value +
": " + type.getName());
}
if (list == null) {
list = new ArrayList(fields.size());
}
if (value <= list.size() && list.get(value - 1) != null) {
throw new IllegalArgumentException
("@KeyField index value " + value +
" is used more than once: " + type.getName());
}
while (value > list.size()) {
list.add(null);
}
FieldMetadata metadata = new FieldMetadata
(field.getName(), field.getType().getName(),
type.getName());
list.set(value - 1, metadata);
}
}
if (list != null) {
if (list.size() < fields.size()) {
throw new IllegalArgumentException
("@KeyField is missing on one or more instance fields: " +
type.getName());
}
for (int i = 0; i < list.size(); i += 1) {
if (list.get(i) == null) {
throw new IllegalArgumentException
("@KeyField is missing for index value " + (i + 1) +
": " + type.getName());
}
}
}
if (list != null) {
list = Collections.unmodifiableList(list);
}
return list;
}
/**
* Add newly discovered metadata to our stash of entity info. This info
* is maintained as it is discovered because it would be expensive to
* create it on demand -- all class metadata would have to be traversed.
*/
private void updateEntityInfo(ClassMetadata metadata) {
/*
* Find out whether this class or its superclass is an entity. In the
* process, traverse all superclasses to load their metadata -- this
* will populate as much entity info as possible.
*/
String entityClass = null;
PrimaryKeyMetadata priKey = null;
Map secKeys =
new HashMap();
for (ClassMetadata data = metadata; data != null;) {
if (data.isEntityClass()) {
if (entityClass != null) {
throw new IllegalArgumentException
("An entity class may not be derived from another" +
" entity class: " + entityClass +
' ' + data.getClassName());
}
entityClass = data.getClassName();
}
/* Save first primary key encountered. */
if (priKey == null) {
priKey = data.getPrimaryKey();
}
/* Save all secondary keys encountered by key name. */
Map classSecKeys =
data.getSecondaryKeys();
if (classSecKeys != null) {
for (SecondaryKeyMetadata secKey : classSecKeys.values()) {
secKeys.put(secKey.getKeyName(), secKey);
}
}
/* Load superclass metadata. */
Class cls;
try {
cls = resolveClass(data.getClassName());
} catch (ClassNotFoundException e) {
throw DbCompat.unexpectedException(e);
}
cls = cls.getSuperclass();
if (cls != Object.class) {
data = getClassMetadata(cls.getName());
if (data == null) {
throw new IllegalArgumentException
("Persistent class has non-persistent superclass: " +
cls.getName());
}
} else {
data = null;
}
}
/* Add primary and secondary key entity info. */
if (entityClass != null) {
EntityInfo info = entityMap.get(entityClass);
if (info == null) {
info = new EntityInfo();
entityMap.put(entityClass, info);
}
if (priKey == null) {
throw new IllegalArgumentException
("Entity class has no primary key: " + entityClass);
}
info.priKey = priKey;
info.secKeys.putAll(secKeys);
}
}
}
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