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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.plugins.version;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.annotation.Nonnull;
import com.google.common.collect.ImmutableSet;
import org.apache.jackrabbit.JcrConstants;
import org.apache.jackrabbit.oak.api.CommitFailedException;
import org.apache.jackrabbit.oak.api.PropertyState;
import org.apache.jackrabbit.oak.api.Tree;
import org.apache.jackrabbit.oak.api.Type;
import org.apache.jackrabbit.oak.commons.PathUtils;
import org.apache.jackrabbit.oak.plugins.tree.impl.ImmutableTree;
import org.apache.jackrabbit.oak.plugins.nodetype.NodeTypeConstants;
import org.apache.jackrabbit.oak.spi.commit.CommitHook;
import org.apache.jackrabbit.oak.spi.commit.CommitInfo;
import org.apache.jackrabbit.oak.spi.state.DefaultNodeStateDiff;
import org.apache.jackrabbit.oak.spi.state.NodeBuilder;
import org.apache.jackrabbit.oak.spi.state.NodeState;
import org.apache.jackrabbit.oak.spi.state.NodeStateUtils;
import static org.apache.jackrabbit.oak.plugins.memory.EmptyNodeState.EMPTY_NODE;
/**
* Commit hook which is responsible for storing the path of the versionable
* node with every version history. This includes creating the path property
* for every workspace the version history is represented and updating the
* path upon moving around a versionable node.
*/
public class VersionablePathHook implements CommitHook {
private final String workspaceName;
public VersionablePathHook(String workspaceName) {
this.workspaceName = workspaceName;
}
@Nonnull
@Override
public NodeState processCommit(
NodeState before, NodeState after, CommitInfo info)
throws CommitFailedException {
NodeBuilder rootBuilder = after.builder();
NodeBuilder vsRoot = rootBuilder.child(NodeTypeConstants.JCR_SYSTEM).child(NodeTypeConstants.JCR_VERSIONSTORAGE);
ReadWriteVersionManager vMgr = new ReadWriteVersionManager(vsRoot, rootBuilder);
List exceptions = new ArrayList();
after.compareAgainstBaseState(before,
new Diff(vMgr, new Node(rootBuilder), exceptions));
if (!exceptions.isEmpty()) {
throw exceptions.get(0);
}
return rootBuilder.getNodeState();
}
@Override
public String toString() {
return "VersionablePathHook : workspaceName = " + workspaceName;
}
private final class Diff extends DefaultNodeStateDiff implements VersionConstants {
private final ReadWriteVersionManager versionManager;
private final Node nodeAfter;
private final List exceptions;
private Diff(@Nonnull ReadWriteVersionManager versionManager,
@Nonnull Node node,
@Nonnull List exceptions) {
this.versionManager = versionManager;
this.nodeAfter = node;
this.exceptions = exceptions;
}
@Override
public boolean propertyAdded(PropertyState after) {
return setVersionablePath(after);
}
@Override
public boolean propertyChanged(PropertyState before, PropertyState after) {
return setVersionablePath(after);
}
@Override
public boolean childNodeAdded(String name, NodeState after) {
return childNodeChanged(name, EMPTY_NODE, after);
}
@Override
public boolean childNodeChanged(
String name, NodeState before, NodeState after) {
if (NodeStateUtils.isHidden(name)) {
// do not traverse into hidden trees
return true;
}
Node node = new Node(nodeAfter, name);
return after.compareAgainstBaseState(
before, new Diff(versionManager, node, exceptions));
}
private boolean setVersionablePath(PropertyState after) {
if (JcrConstants.JCR_VERSIONHISTORY.equals(after.getName()) && nodeAfter.isVersionable(versionManager)) {
NodeBuilder vhBuilder;
try {
vhBuilder = versionManager.getOrCreateVersionHistory(
nodeAfter.builder, Collections.emptyMap());
} catch (CommitFailedException e) {
exceptions.add(e);
// stop further comparison
return false;
}
if (!vhBuilder.hasProperty(JcrConstants.JCR_MIXINTYPES)) {
vhBuilder.setProperty(
JcrConstants.JCR_MIXINTYPES,
ImmutableSet.of(MIX_REP_VERSIONABLE_PATHS),
Type.NAMES);
}
String versionablePath = nodeAfter.path;
vhBuilder.setProperty(workspaceName, versionablePath, Type.PATH);
}
return true;
}
}
private static final class Node {
private final String path;
private final NodeBuilder builder;
private Node(NodeBuilder rootBuilder) {
this.path = "/";
this.builder = rootBuilder;
}
private Node(Node parent, String name) {
this.builder = parent.builder.child(name);
this.path = PathUtils.concat(parent.path, name);
}
private boolean isVersionable(ReadWriteVersionManager versionManager) {
Tree tree = new ImmutableTree(ImmutableTree.ParentProvider.UNSUPPORTED, PathUtils.getName(path), builder.getNodeState());
return versionManager.isVersionable(tree);
}
}
}
