/*
* 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.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import org.infinispan.commons.marshall.SerializeWith;
import org.infinispan.commons.util.Util;
import org.infinispan.schematic.document.Immutable;
import org.infinispan.schematic.document.Path;
import org.infinispan.schematic.internal.HashCode;
import org.infinispan.schematic.internal.SchematicExternalizer;
import org.infinispan.schematic.internal.document.MutableArray;
import org.infinispan.schematic.internal.document.MutableDocument;
import org.infinispan.schematic.internal.marshall.Ids;
/**
* An atomic remove operation for SchematicValueDelta.
*
* @author (various)
* @since 5.1
*/
@Immutable
@SerializeWith( ClearOperation.Externalizer.class )
public class ClearOperation extends ArrayOperation {
private transient List<?> removedValues;
public ClearOperation( Path path ) {
super(path, HashCode.compute(path));
}
@Override
public ClearOperation clone() {
return this; // immutable
}
@Override
public void replay( MutableDocument delegate ) {
MutableArray array = mutableParent(delegate);
if (!array.isEmpty()) {
removedValues = new ArrayList<Object>(array);
array.clear();
} else {
removedValues = Collections.emptyList();
}
}
@Override
public void rollback( MutableDocument delegate ) {
if (removedValues != null) {
MutableArray array = mutableParent(delegate);
array.clear();
array.addAll(removedValues);
removedValues = null;
}
}
@Override
public String toString() {
return "Clear at '" + parentPath + "' the existing values";
}
@Override
public int hashCode() {
return super.hashCode();
}
@Override
public boolean equals( Object obj ) {
if (obj instanceof ClearOperation) {
ClearOperation that = (ClearOperation)obj;
return equalsIfNotNull(getParentPath(), that.getParentPath());
}
return false;
}
public static final class Externalizer extends SchematicExternalizer<ClearOperation> {
private static final long serialVersionUID = 1L;
@Override
public void writeObject( ObjectOutput output,
ClearOperation remove ) throws IOException {
output.writeObject(remove.parentPath);
}
@Override
public ClearOperation readObject( ObjectInput input ) throws IOException, ClassNotFoundException {
Path path = (Path)input.readObject();
return new ClearOperation(path);
}
@Override
public Integer getId() {
return Ids.SCHEMATIC_VALUE_CLEAR_OPERATION;
}
@SuppressWarnings( "unchecked" )
@Override
public Set<Class<? extends ClearOperation>> getTypeClasses() {
return Util.<Class<? extends ClearOperation>>asSet(ClearOperation.class);
}
}
}