/*
* ModeShape (http://www.modeshape.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.infinispan.schematic.internal.delta;
import java.util.ArrayList;
import java.util.Collection;
import org.infinispan.schematic.document.Document;
import org.infinispan.schematic.document.Immutable;
import org.infinispan.schematic.document.Path;
import org.infinispan.schematic.internal.document.MutableDocument;
/**
* An atomic operation for SchematicValueDelta.
* <p/>
*
* @author (various)
*/
@Immutable
public abstract class Operation {
protected final Path parentPath;
private final int hashCode;
protected Operation( Path parentPath,
int hashCode ) {
this.parentPath = parentPath;
this.hashCode = hashCode;
}
@Override
public int hashCode() {
return hashCode;
}
public abstract void replay( MutableDocument delegate );
public abstract void rollback( MutableDocument delegate );
public Path getParentPath() {
return parentPath;
}
protected MutableDocument mutableParent( MutableDocument delegate ) {
MutableDocument parent = delegate;
Path parentPath = getParentPath();
for (String fieldName : parentPath) {
assert parent != null : "Unexpected to find path " + parentPath + " in " + delegate + ". Unable to apply operation "
+ this;
parent = (MutableDocument)parent.getDocument(fieldName);
}
return parent;
}
@Override
public abstract Operation clone();
protected Object cloneValue( Object value ) {
if (value == null) return null;
if (value instanceof Document) return ((Document)value).clone();
if (value instanceof Collection) {
Collection<?> original = (Collection<?>)value;
Collection<Object> copy = new ArrayList<Object>(original.size());
for (Object v : original) {
copy.add(cloneValue(v));
}
return copy;
}
// everything else should be immutable ...
return value;
}
protected boolean equalsIfNotNull( Object obj1,
Object obj2 ) {
if (obj1 == null) {
return obj2 == null;
}
return obj1.equals(obj2);
}
}