/*
* 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.plugins.unique;
import java.util.List;
import org.apache.jackrabbit.oak.api.CommitFailedException;
import org.apache.jackrabbit.oak.spi.commit.CommitHook;
import org.apache.jackrabbit.oak.spi.commit.ValidatingHook;
import org.apache.jackrabbit.oak.spi.state.ChildNodeEntry;
import org.apache.jackrabbit.oak.spi.state.NodeBuilder;
import org.apache.jackrabbit.oak.spi.state.NodeState;
import org.apache.jackrabbit.oak.spi.state.NodeStore;
import com.google.common.collect.Lists;
/**
* Commit hook for validating uniqueness constraints and maintaining
* indices of unique properties.
* <p>
* TODO: verify if enforcing uniqueness constraints is really
* feasible in oak-core taking potential clustering into account
* <p>
* TODO: check if constraint validation needs to take property
* definition into account e.g. a jcr:uuid property that isn't
* defined by mix:referenceable may not necessarily be subject
* to the validation.
*/
public class UniqueIndexHook implements CommitHook {
@Override
public NodeState processCommit(
NodeStore store, NodeState before, NodeState after)
throws CommitFailedException {
NodeBuilder builder = store.getBuilder(after);
NodeBuilder system = builder.getChildBuilder("jcr:system");
NodeBuilder unique = system.getChildBuilder(":unique");
final List<UniqueIndexValidator> validators = Lists.newArrayList();
NodeState state = unique.getNodeState();
for (ChildNodeEntry entry : state.getChildNodeEntries()) {
validators.add(new UniqueIndexValidator(
entry.getName(), entry.getNodeState()));
}
if (validators.isEmpty()) {
return after; // shortcut
}
new ValidatingHook(validators).processCommit(store, before, after);
for (UniqueIndexValidator validator : validators) {
validator.apply(unique);
}
return builder.getNodeState();
}
}