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RePlay is a fork of the Play1 framework, created by Codeborne.
package play.db.jpa;
import org.apache.commons.beanutils.PropertyUtils;
import play.data.binding.NoBinding;
import play.db.Model;
import play.exceptions.UnexpectedException;
import jakarta.persistence.*;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.util.*;
public class JPAModelLoader implements Model.Factory {
private final String dbName;
private final Class clazz;
private Map properties;
public JPAModelLoader(Class clazz) {
this.clazz = clazz;
this.dbName = JPA.getDBName(clazz);
}
/**
* Find object by ID
* @param id : the id of the entity
*/
@Override
public Model findById(Object id) {
try {
if (id == null) {
return null;
}
return JPA.em(this.dbName).find(this.clazz, id);
} catch (Exception e) {
// Key is invalid, thus nothing was found
return null;
}
}
/**
* Retrieve a list of result
*
* @param offset
* position of the first result, numbered from 0
* @param size
* maximum number of results to retrieve
* @param orderBy
* Order by field
* @param order
* Sorting order
* @param searchFields
* (page length)
* @param keywords
* (page length)
* @param where
* (page length)
* @return a list of results
*/
@SuppressWarnings("unchecked")
@Override
public List fetch(int offset, int size, String orderBy, String order, List searchFields,
String keywords, String where) {
StringBuilder q = new StringBuilder("from ").append(this.clazz.getName());
if (keywords != null && !keywords.isEmpty()) {
String searchQuery = this.getSearchQuery(searchFields);
if (!searchQuery.equals("")) {
q.append(" where (").append(searchQuery).append(")");
}
q.append((where != null ? " and " + where : ""));
} else {
q.append((where != null ? " where " + where : ""));
}
if (orderBy == null && order == null) {
orderBy = "id";
order = "ASC";
} else if (orderBy == null) {
orderBy = "id";
}
if (order == null || (!order.equals("ASC") && !order.equals("DESC"))) {
order = "ASC";
}
q.append( " order by ").append(orderBy).append(" ").append(order);
String jpql = q.toString();
Query query = JPA.em(this.dbName).createQuery(jpql);
if (keywords != null && !keywords.equals("") && jpql.contains("?1")) {
query.setParameter(1, "%" + keywords.toLowerCase() + "%");
}
query.setFirstResult(offset);
query.setMaxResults(size);
return query.getResultList();
}
@Override
public Long count(List searchFields, String keywords, String where) {
String q = "select count(*) from " + this.clazz.getName() + " e";
if (keywords != null && !keywords.equals("")) {
String searchQuery = getSearchQuery(searchFields);
if (!searchQuery.equals("")) {
q += " where (" + searchQuery + ")";
}
q += (where != null ? " and " + where : "");
} else {
q += (where != null ? " where " + where : "");
}
Query query = JPA.em(this.dbName).createQuery(q);
if (keywords != null && !keywords.equals("") && q.contains("?1")) {
query.setParameter(1, "%" + keywords.toLowerCase() + "%");
}
return Long.decode(query.getSingleResult().toString());
}
@Override
public void deleteAll() {
JPA.em(this.dbName).createQuery("delete from " + this.clazz.getName()).executeUpdate();
}
/**
* List of all properties
*/
@Override
public List listProperties() {
List properties = new ArrayList<>();
Set fields = new LinkedHashSet<>();
Class tclazz = this.clazz;
while (!tclazz.equals(Object.class)) {
Collections.addAll(fields, tclazz.getDeclaredFields());
tclazz = tclazz.getSuperclass();
}
for (Field f : fields) {
int mod = f.getModifiers();
if (Modifier.isTransient(mod) || Modifier.isStatic(mod)) {
continue;
}
if (f.isAnnotationPresent(Transient.class)) {
continue;
}
if (f.isAnnotationPresent(NoBinding.class)) {
NoBinding a = f.getAnnotation(NoBinding.class);
List values = Arrays.asList(a.value());
if (values.contains("*")) {
continue;
}
}
Model.Property mp = buildProperty(f);
if (mp != null) {
properties.add(mp);
}
}
return properties;
}
@Override
public String keyName() {
return keyField().getName();
}
@Override
public Class keyType() {
return keyField().getType();
}
public Class[] keyTypes() {
Field[] fields = keyFields();
Class[] types = new Class[fields.length];
int i = 0;
for (Field field : fields) {
types[i++] = field.getType();
}
return types;
}
public String[] keyNames() {
Field[] fields = keyFields();
String[] names = new String[fields.length];
int i = 0;
for (Field field : fields) {
names[i++] = field.getName();
}
return names;
}
private Class getCompositeKeyClass() {
Class tclazz = this.clazz;
while (!tclazz.equals(Object.class)) {
// Only consider mapped types
if (tclazz.isAnnotationPresent(Entity.class) || tclazz.isAnnotationPresent(MappedSuperclass.class)) {
IdClass idClass = tclazz.getAnnotation(IdClass.class);
if (idClass != null)
return idClass.value();
}
tclazz = tclazz.getSuperclass();
}
throw new UnexpectedException("Invalid mapping for class " + clazz
+ ": multiple IDs with no @IdClass annotation");
}
/**
*
*/
private void initProperties() {
synchronized (this) {
if (this.properties != null){
return;
}
this.properties = new HashMap<>();
Set fields = getModelFields(this.clazz);
for (Field f : fields) {
int mod = f.getModifiers();
if (Modifier.isTransient(mod) || Modifier.isStatic(mod)) {
continue;
}
if (f.isAnnotationPresent(Transient.class)) {
continue;
}
Model.Property mp = buildProperty(f);
if (mp != null) {
properties.put(mp.name, mp);
}
}
}
}
private Object makeCompositeKey(Model model) throws Exception {
initProperties();
Class idClass = getCompositeKeyClass();
Object id = idClass.getDeclaredConstructor().newInstance();
PropertyDescriptor[] idProperties = PropertyUtils.getPropertyDescriptors(idClass);
if (idProperties == null || idProperties.length == 0){
throw new UnexpectedException("Composite id has no properties: " + idClass.getName());
}
for (PropertyDescriptor idProperty : idProperties) {
// do we have a field for this?
String idPropertyName = idProperty.getName();
// skip the "class" property...
if (idPropertyName.equals("class"))
continue;
Model.Property modelProperty = this.properties.get(idPropertyName);
if (modelProperty == null)
throw new UnexpectedException("Composite id property missing: " + clazz.getName() + "."
+ idPropertyName + " (defined in IdClass " + idClass.getName() + ")");
// sanity check
Object value = modelProperty.field.get(model);
if (modelProperty.isMultiple)
throw new UnexpectedException("Composite id property cannot be multiple: " + clazz.getName() + "."
+ idPropertyName);
// now is this property a relation? if yes then we must use its ID
// in the key (as per specs)
if (modelProperty.isRelation) {
// get its id
if (!Model.class.isAssignableFrom(modelProperty.type))
throw new UnexpectedException("Composite id property entity has to be a subclass of Model: "
+ clazz.getName() + "." + idPropertyName);
// we already checked that cast above
@SuppressWarnings("unchecked")
Model.Factory factory = Model.Manager.factoryFor((Class) modelProperty.type);
// we already checked that cast above
if (value != null)
value = factory.keyValue((Model) value);
}
// now affect the composite id with this id
PropertyUtils.setSimpleProperty(id, idPropertyName, value);
}
return id;
}
@Override
public Object keyValue(Model m) {
try {
if (m == null) {
return null;
}
// Do we have a @IdClass or @Embeddable?
if (m.getClass().isAnnotationPresent(IdClass.class)) {
return makeCompositeKey(m);
}
// Is it a composite key? If yes we need to return the matching PK
Field[] fields = keyFields();
Object[] values = new Object[fields.length];
int i = 0;
for (Field f : fields) {
Object o = f.get(m);
if (o != null) {
values[i++] = o;
}
}
// If we have only one id return it
if (values.length == 1) {
return values[0];
}
return values;
} catch (Exception ex) {
throw new UnexpectedException(ex);
}
}
public static Set getModelFields(Class clazz) {
Set fields = new LinkedHashSet<>();
Class tclazz = clazz;
while (!tclazz.equals(Object.class)) {
// Only add fields for mapped types
if (tclazz.isAnnotationPresent(Entity.class) || tclazz.isAnnotationPresent(MappedSuperclass.class))
Collections.addAll(fields, tclazz.getDeclaredFields());
tclazz = tclazz.getSuperclass();
}
return fields;
}
Field keyField() {
Class c = this.clazz;
try {
while (!c.equals(Object.class)) {
for (Field field : c.getDeclaredFields()) {
if (field.isAnnotationPresent(Id.class) || field.isAnnotationPresent(EmbeddedId.class)) {
field.setAccessible(true);
return field;
}
}
c = c.getSuperclass();
}
} catch (Exception e) {
throw new UnexpectedException("Error while determining the object @Id for an object of type " + clazz, e);
}
throw new UnexpectedException("Cannot get the object @Id for an object of type " + clazz);
}
Field[] keyFields() {
Class c = this.clazz;
try {
List fields = new ArrayList<>();
while (!c.equals(Object.class)) {
for (Field field : c.getDeclaredFields()) {
if (field.isAnnotationPresent(Id.class) || field.isAnnotationPresent(EmbeddedId.class)) {
field.setAccessible(true);
fields.add(field);
}
}
c = c.getSuperclass();
}
Field[] f = fields.toArray(new Field[fields.size()]);
if (f.length == 0) {
throw new UnexpectedException("Cannot get the object @Id for an object of type " + clazz);
}
return f;
} catch (Exception e) {
throw new UnexpectedException("Error while determining the object @Id for an object of type " + clazz, e);
}
}
String getSearchQuery(List searchFields) {
StringBuilder q = new StringBuilder();
for (Model.Property property : this.listProperties()) {
if (property.isSearchable
&& (searchFields == null || searchFields.isEmpty() || searchFields.contains(property.name))) {
if (q.length() > 0) {
q.append(" or ");
}
q.append("lower(").append(property.name).append(") like ?1");
}
}
return q.toString();
}
Model.Property buildProperty(final Field field) {
Model.Property modelProperty = new Model.Property();
modelProperty.type = field.getType();
modelProperty.field = field;
if (Model.class.isAssignableFrom(field.getType())) {
if (field.isAnnotationPresent(OneToOne.class)) {
if (field.getAnnotation(OneToOne.class).mappedBy().equals("")) {
modelProperty.isRelation = true;
modelProperty.relationType = field.getType();
final String modelDbName = JPA.getDBName(modelProperty.relationType);
modelProperty.choices = () -> JPA.em(modelDbName).createQuery("from " + field.getType().getName()).getResultList();
}
}
if (field.isAnnotationPresent(ManyToOne.class)) {
modelProperty.isRelation = true;
modelProperty.relationType = field.getType();
final String modelDbName = JPA.getDBName(modelProperty.relationType);
modelProperty.choices = () -> JPA.em(modelDbName).createQuery("from " + field.getType().getName()).getResultList();
}
}
if (Collection.class.isAssignableFrom(field.getType())) {
final Class fieldType = (Class) ((ParameterizedType) field.getGenericType()).getActualTypeArguments()[0];
if (field.isAnnotationPresent(OneToMany.class)) {
if (field.getAnnotation(OneToMany.class).mappedBy().equals("")) {
modelProperty.isRelation = true;
modelProperty.isMultiple = true;
modelProperty.relationType = fieldType;
final String modelDbName = JPA.getDBName(modelProperty.relationType);
modelProperty.choices = () -> JPA.em(modelDbName).createQuery("from " + fieldType.getName()).getResultList();
}
}
if (field.isAnnotationPresent(ManyToMany.class)) {
if (field.getAnnotation(ManyToMany.class).mappedBy().equals("")) {
modelProperty.isRelation = true;
modelProperty.isMultiple = true;
modelProperty.relationType = fieldType;
final String modelDbName = JPA.getDBName(field.getType());
modelProperty.choices = () -> JPA.em(modelDbName).createQuery("from " + fieldType.getName()).getResultList();
}
}
}
if (field.getType().isEnum()) {
modelProperty.choices = () -> (List © 2015 - 2024 Weber Informatics LLC | Privacy Policy