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ChangeManagerImpl.java
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ChangeManagerImpl.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.change;
import cz.cvut.kbss.jopa.exceptions.OWLInferredAttributeModifiedException;
import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
import cz.cvut.kbss.jopa.sessions.ChangeManager;
import cz.cvut.kbss.jopa.sessions.MetamodelProvider;
import cz.cvut.kbss.jopa.sessions.ObjectChangeSet;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Field;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
public class ChangeManagerImpl implements ChangeManager {
private static final Logger LOG = LoggerFactory.getLogger(ChangeManagerImpl.class);
private final Map<Object, Object> visitedObjects;
private final MetamodelProvider metamodelProvider;
private final ChangeDetector changeDetector;
public ChangeManagerImpl(MetamodelProvider metamodelProvider) {
this.metamodelProvider = metamodelProvider;
this.changeDetector = new ChangeDetectors(metamodelProvider);
visitedObjects = new IdentityHashMap<>();
}
@Override
public boolean hasChanges(Object original, Object clone) {
boolean res = hasChangesInternal(original, clone);
visitedObjects.clear();
return res;
}
/**
* This method does the actual check for changes. It is wrapped in the public method since the IdentityMap for
* visited objects has to be cleared after the whole check is done.
*
* @param original The original object.
* @param clone The clone that may have changed.
* @return True if the clone is in different state than the original.
*/
boolean hasChangesInternal(Object original, Object clone) {
if (clone == null && original == null) {
return false;
}
if (clone == null || original == null) {
return true;
}
if (visitedObjects.containsKey(clone)) {
return false;
}
final Class<?> cls = clone.getClass();
for (FieldSpecification<?, ?> fs : getFields(cls)) {
final Field f = fs.getJavaField();
final Object clVal = EntityPropertiesUtils.getFieldValue(f, clone);
final Object origVal = EntityPropertiesUtils.getFieldValue(f, original);
final boolean valueChanged = valueChanged(origVal, clVal);
if (valueChanged) {
return true;
}
}
return false;
}
private <X> Set<FieldSpecification<? super X, ?>> getFields(Class<X> cls) {
return metamodelProvider.getMetamodel().entity(cls).getFieldSpecifications();
}
private boolean valueChanged(Object orig, Object clone) {
return changeDetector.hasChanges(clone, orig);
}
@Override
public boolean calculateChanges(ObjectChangeSet changeSet) throws OWLInferredAttributeModifiedException {
return calculateChangesInternal(Objects.requireNonNull(changeSet));
}
/**
* This internal method does the actual changes calculation. It compares every non-static attribute of the clone to
* the original value. If the values are different, a change record is added into the change set.
*
* @param changeSet The change set where change records will be put in. It also contains reference to the clone and
* original object.
*/
private boolean calculateChangesInternal(ObjectChangeSet changeSet) {
LOG.trace("Calculating changes for change set {}.", changeSet);
Object original = changeSet.getChangedObject();
Object clone = changeSet.getCloneObject();
boolean changes = false;
for (FieldSpecification<?, ?> fs : getFields(clone.getClass())) {
final Field f = fs.getJavaField();
Object clVal = EntityPropertiesUtils.getFieldValue(f, clone);
Object origVal = EntityPropertiesUtils.getFieldValue(f, original);
if (clVal == null && origVal == null) {
continue;
}
boolean changed = valueChanged(origVal, clVal);
if (changed) {
changeSet.addChangeRecord(new ChangeRecordImpl(fs, clVal));
changes = true;
}
}
return changes;
}
}