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DefaultInstanceBuilder.java
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DefaultInstanceBuilder.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.sessions;
import cz.cvut.kbss.jopa.exceptions.OWLPersistenceException;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* This class has responsibility for creating new instances of various kinds of objects. It handles security
* restrictions as well.
*
* @author kidney
*/
class DefaultInstanceBuilder extends AbstractInstanceBuilder {
DefaultInstanceBuilder(CloneBuilderImpl builder, UnitOfWork uow) {
super(builder, uow);
}
/**
* Builds a new instance of the specified class.
*
* @return New object of the given class.
*/
@Override
Object buildClone(Object cloneOwner, Field field, Object original, Descriptor repository) {
if (original == null) {
return null;
}
final Class<?> javaClass = original.getClass();
if (CloneBuilderImpl.isImmutable(javaClass)) {
return original;
}
Object newInstance = buildNewInstanceUsingDefaultConstructor(javaClass);
if (newInstance == null) {
final Field[] fields = javaClass.getDeclaredFields();
List<Class<?>> fieldClasses = new ArrayList<>();
Constructor<?> c;
try {
for (Field f : fields) {
if (EntityPropertiesUtils.isFieldTransient(f)) {
continue;
}
Class<?>[] args = {f.getType()};
c = getDeclaredConstructorFor(javaClass, args);
if (c == null) {
fieldClasses.add(f.getType());
} else {
try {
Object[] params = new Object[1];
params[0] = original.getClass().getDeclaredField(f.getName());
newInstance = c.newInstance(params);
return newInstance;
} catch (SecurityException e) {
logConstructorAccessException(c, e);
try {
newInstance = AccessController
.doPrivileged(new PrivilegedInstanceCreator(c));
} catch (PrivilegedActionException ex) {
throw new OWLPersistenceException(ex);
}
if (newInstance != null) {
return newInstance;
}
} catch (NoSuchFieldException e) {
throw new OWLPersistenceException(e);
}
}
}
Class<?>[] args = new Class<?>[fieldClasses.size()];
args = fieldClasses.toArray(args);
c = getDeclaredConstructorFor(javaClass, args);
if (c != null) {
Object[] params = new Object[args.length];
for (int i = 0; i < params.length; i++) {
params[i] = null;
}
try {
newInstance = c.newInstance(params);
} catch (SecurityException e) {
logConstructorAccessException(c, e);
try {
newInstance = AccessController
.doPrivileged(new PrivilegedInstanceCreator(c));
} catch (PrivilegedActionException ex) {
throw new OWLPersistenceException(ex);
}
}
}
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
throw new OWLPersistenceException(e);
}
}
if (newInstance == null) {
throw new OWLPersistenceException(
"Unable to create a new object or to find a suitable constructor for class "
+ javaClass.getName());
}
return newInstance;
}
@Override
void mergeChanges(Field field, Object target, Object originalValue, Object cloneValue) {
if (originalValue == null) {
Object clOrig = builder.getOriginal(cloneValue);
if (clOrig == null) {
clOrig = cloneValue;
}
EntityPropertiesUtils.setFieldValue(field, target, clOrig);
return;
}
Class<?> cls = originalValue.getClass();
if (builder.isTypeManaged(cls) && builder.getOriginal(cloneValue) != null) {
EntityPropertiesUtils.setFieldValue(field, target, builder.getOriginal(cloneValue));
} else {
mergeFieldChanges(originalValue, cloneValue, cls);
}
}
private void mergeFieldChanges(Object originalValue, Object cloneValue, Class<?> cls) {
List<Field> fields = EntityPropertiesUtils.getAllFields(cls);
for (Field f : fields) {
Object clVal = EntityPropertiesUtils.getFieldValue(f, cloneValue);
Object origVal = EntityPropertiesUtils.getFieldValue(f, originalValue);
if (!(clVal instanceof Collection) && !builder.isOriginalInUoW(origVal)) {
EntityPropertiesUtils.setFieldValue(f, originalValue, clVal);
} else {
builder.getInstanceBuilder(origVal).mergeChanges(f, originalValue, origVal, clVal);
}
}
}
/**
* Builds a new instance of the specified class, using its no-argument constructor.
*
* @return New object of the given class, or null if the class has no no-argument constructor.
*/
private Object buildNewInstanceUsingDefaultConstructor(final Class<?> javaClass) {
final Constructor<?> c = getDeclaredConstructorFor(javaClass, null);
Object newInstance = null;
if (c != null) {
try {
try {
newInstance = c.newInstance((Object[]) null);
} catch (SecurityException e) {
logConstructorAccessException(c, e);
try {
newInstance = AccessController
.doPrivileged(new PrivilegedInstanceCreator(c));
} catch (PrivilegedActionException ex) {
logPrivilegedConstructorAccessException(c, ex);
return null;
}
}
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
LOG.trace("Class does not have suitable no-arg constructor. {}", e);
// Do nothing
}
}
return newInstance;
}
}