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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.jackrabbit.oak.spi.commit;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.Lists.newLinkedList;
import static org.apache.jackrabbit.oak.spi.state.ConflictType.ADD_EXISTING_NODE;
import static org.apache.jackrabbit.oak.spi.state.ConflictType.ADD_EXISTING_PROPERTY;
import static org.apache.jackrabbit.oak.spi.state.ConflictType.CHANGE_CHANGED_PROPERTY;
import static org.apache.jackrabbit.oak.spi.state.ConflictType.CHANGE_DELETED_NODE;
import static org.apache.jackrabbit.oak.spi.state.ConflictType.CHANGE_DELETED_PROPERTY;
import static org.apache.jackrabbit.oak.spi.state.ConflictType.DELETE_CHANGED_NODE;
import static org.apache.jackrabbit.oak.spi.state.ConflictType.DELETE_CHANGED_PROPERTY;
import static org.apache.jackrabbit.oak.spi.state.ConflictType.DELETE_DELETED_NODE;
import static org.apache.jackrabbit.oak.spi.state.ConflictType.DELETE_DELETED_PROPERTY;
import java.util.LinkedList;
import javax.annotation.Nonnull;
import org.apache.jackrabbit.oak.api.PropertyState;
import org.apache.jackrabbit.oak.spi.state.NodeBuilder;
import org.apache.jackrabbit.oak.spi.state.NodeState;
/**
* A {@code CompositeConflictHandler} delegates conflict handling
* to multiple backing handlers. The backing handlers are invoked in
* the inverse order they have been installed until a handler returning
* a valid resolution (i.e. not {@code null)} is found. If for a certain
* conflict none of the backing handlers returns a valid resolution
* this implementation throws an {@code IllegalStateException}.
*/
public class CompositeConflictHandler implements ConflictHandler {
private final LinkedList handlers;
/**
* Create a new {@code CompositeConflictHandler} with an initial set of
* backing handler. Use {@link #addHandler(PartialConflictHandler)} to add additional
* handlers.
* @param handlers the backing handlers
*/
public CompositeConflictHandler(@Nonnull Iterable handlers) {
this.handlers = newLinkedList(checkNotNull(handlers));
}
/**
* Create a new {@code CompositeConflictHandler} with no backing handlers.
* backing handler. Use {@link #addHandler(PartialConflictHandler)} to add handlers.
*/
public CompositeConflictHandler() {
this.handlers = newLinkedList();
}
/**
* Add a new backing conflict handler. The new handler takes precedence
* over all currently installed handlers.
* @param handler
* @return this
*/
public CompositeConflictHandler addHandler(PartialConflictHandler handler) {
handlers.addFirst(handler);
return this;
}
@Override
public Resolution addExistingProperty(NodeBuilder parent, PropertyState ours, PropertyState theirs) {
for (PartialConflictHandler handler : handlers) {
Resolution resolution = handler.addExistingProperty(parent, ours, theirs);
if (resolution != null) {
return resolution;
}
}
throw new IllegalStateException("No conflict handler for " +
ADD_EXISTING_PROPERTY + " conflict");
}
@Override
public Resolution changeDeletedProperty(NodeBuilder parent, PropertyState ours) {
for (PartialConflictHandler handler : handlers) {
Resolution resolution = handler.changeDeletedProperty(parent, ours);
if (resolution != null) {
return resolution;
}
}
throw new IllegalStateException("No conflict handler for " +
CHANGE_DELETED_PROPERTY + " conflict");
}
@Override
public Resolution changeChangedProperty(NodeBuilder parent, PropertyState ours, PropertyState theirs) {
for (PartialConflictHandler handler : handlers) {
Resolution resolution = handler.changeChangedProperty(parent, ours, theirs);
if (resolution != null) {
return resolution;
}
}
throw new IllegalStateException("No conflict handler for " +
CHANGE_CHANGED_PROPERTY + " conflict");
}
@Override
public Resolution deleteDeletedProperty(NodeBuilder parent, PropertyState ours) {
for (PartialConflictHandler handler : handlers) {
Resolution resolution = handler.deleteDeletedProperty(parent, ours);
if (resolution != null) {
return resolution;
}
}
throw new IllegalStateException("No conflict handler for " +
DELETE_DELETED_PROPERTY + " conflict");
}
@Override
public Resolution deleteChangedProperty(NodeBuilder parent, PropertyState theirs) {
for (PartialConflictHandler handler : handlers) {
Resolution resolution = handler.deleteChangedProperty(parent, theirs);
if (resolution != null) {
return resolution;
}
}
throw new IllegalStateException("No conflict handler for " +
DELETE_CHANGED_PROPERTY + " conflict");
}
@Override
public Resolution addExistingNode(NodeBuilder parent, String name, NodeState ours, NodeState theirs) {
for (PartialConflictHandler handler : handlers) {
Resolution resolution = handler.addExistingNode(parent, name, ours, theirs);
if (resolution != null) {
return resolution;
}
}
throw new IllegalStateException("No conflict handler for " +
ADD_EXISTING_NODE + " conflict");
}
@Override
public Resolution changeDeletedNode(NodeBuilder parent, String name, NodeState ours) {
for (PartialConflictHandler handler : handlers) {
Resolution resolution = handler.changeDeletedNode(parent, name, ours);
if (resolution != null) {
return resolution;
}
}
throw new IllegalStateException("No conflict handler for " +
CHANGE_DELETED_NODE + " conflict");
}
@Override
public Resolution deleteChangedNode(NodeBuilder parent, String name, NodeState theirs) {
for (PartialConflictHandler handler : handlers) {
Resolution resolution = handler.deleteChangedNode(parent, name, theirs);
if (resolution != null) {
return resolution;
}
}
throw new IllegalStateException("No conflict handler for " +
DELETE_CHANGED_NODE + " conflict");
}
@Override
public Resolution deleteDeletedNode(NodeBuilder parent, String name) {
for (PartialConflictHandler handler : handlers) {
Resolution resolution = handler.deleteDeletedNode(parent, name);
if (resolution != null) {
return resolution;
}
}
throw new IllegalStateException("No conflict handler for " +
DELETE_DELETED_NODE + " conflict");
}
}
