| /* |
| * 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.document.secondary; |
| |
| import com.google.common.base.Function; |
| import com.google.common.base.Predicate; |
| import com.google.common.collect.Iterables; |
| import org.apache.jackrabbit.oak.api.PropertyState; |
| import org.apache.jackrabbit.oak.plugins.document.AbstractDocumentNodeState; |
| import org.apache.jackrabbit.oak.plugins.document.NodeStateDiffer; |
| import org.apache.jackrabbit.oak.plugins.document.Path; |
| import org.apache.jackrabbit.oak.plugins.document.RevisionVector; |
| import org.apache.jackrabbit.oak.plugins.memory.MemoryChildNodeEntry; |
| import org.apache.jackrabbit.oak.plugins.memory.MemoryNodeBuilder; |
| 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.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.base.Preconditions.checkState; |
| |
| /** |
| * NodeState wrapper which wraps another NodeState (mostly SegmentNodeState) |
| * so as to expose it as an {@link AbstractDocumentNodeState} by extracting |
| * the meta properties which are stored as hidden properties |
| */ |
| public class DelegatingDocumentNodeState extends AbstractDocumentNodeState { |
| //Hidden props holding DocumentNodeState meta properties |
| public static final String PROP_REVISION = ":doc-rev"; |
| public static final String PROP_LAST_REV = ":doc-lastRev"; |
| |
| private static final Predicate<PropertyState> NOT_META_PROPS = new Predicate<PropertyState>() { |
| @Override |
| public boolean apply(PropertyState input) { |
| return !input.getName().startsWith(":doc-"); |
| } |
| }; |
| |
| private final NodeStateDiffer differ; |
| private final NodeState delegate; |
| private final RevisionVector rootRevision; |
| private final boolean fromExternalChange; |
| private final Path path; |
| private RevisionVector lastRevision; |
| |
| |
| /** |
| * Wraps a given root NodeState as a {@link DelegatingDocumentNodeState} if |
| * it has required meta properties otherwise just returns the passed NodeState |
| * |
| * @param delegate nodeState to wrap |
| * @return wrapped state or original state |
| */ |
| public static NodeState wrapIfPossible(NodeState delegate, NodeStateDiffer differ) { |
| if (hasMetaProps(delegate)) { |
| String revVector = getRequiredProp(delegate, PROP_REVISION); |
| return new DelegatingDocumentNodeState(delegate, Path.ROOT, RevisionVector.fromString(revVector), false, differ); |
| } |
| return delegate; |
| } |
| |
| public static boolean hasMetaProps(NodeState delegate) { |
| return delegate.hasProperty(PROP_REVISION); |
| } |
| |
| public static AbstractDocumentNodeState wrap(NodeState delegate, NodeStateDiffer differ) { |
| String revVector = getRequiredProp(delegate, PROP_REVISION); |
| return new DelegatingDocumentNodeState(delegate, Path.ROOT, RevisionVector.fromString(revVector), false, differ); |
| } |
| |
| private DelegatingDocumentNodeState(NodeState delegate, Path path, RevisionVector rootRevision, |
| boolean fromExternalChange, NodeStateDiffer differ) { |
| this.differ = differ; |
| this.delegate = delegate; |
| this.rootRevision = rootRevision; |
| this.fromExternalChange = fromExternalChange; |
| this.path = path; |
| } |
| |
| private DelegatingDocumentNodeState(DelegatingDocumentNodeState original, |
| RevisionVector rootRevision, boolean fromExternalChange) { |
| this.differ = original.differ; |
| this.delegate = original.delegate; |
| this.rootRevision = rootRevision; |
| this.fromExternalChange = fromExternalChange; |
| this.path = original.path; |
| this.lastRevision = original.lastRevision; |
| } |
| |
| //~----------------------------------< AbstractDocumentNodeState > |
| |
| @Override |
| public Path getPath() { |
| return path; |
| } |
| |
| @Override |
| public RevisionVector getLastRevision() { |
| if (lastRevision == null){ |
| this.lastRevision = RevisionVector.fromString(getRequiredProp(PROP_LAST_REV)); |
| } |
| return lastRevision; |
| } |
| |
| @Override |
| public RevisionVector getRootRevision() { |
| return rootRevision; |
| } |
| |
| @Override |
| public boolean isFromExternalChange() { |
| return fromExternalChange; |
| } |
| |
| @Override |
| public AbstractDocumentNodeState withRootRevision(@NotNull RevisionVector root, boolean externalChange) { |
| if (rootRevision.equals(root) && fromExternalChange == externalChange) { |
| return this; |
| } else { |
| return new DelegatingDocumentNodeState(this, root, externalChange); |
| } |
| } |
| |
| @Override |
| public boolean hasNoChildren() { |
| //Passing max as 1 so as to minimize any overhead. |
| return delegate.getChildNodeCount(1) == 0; |
| } |
| |
| @Override |
| protected NodeStateDiffer getNodeStateDiffer() { |
| return differ; |
| } |
| |
| //~----------------------------------< NodeState > |
| |
| @Override |
| public boolean exists() { |
| return true; |
| } |
| |
| @NotNull |
| @Override |
| public Iterable<? extends PropertyState> getProperties() { |
| return Iterables.filter(delegate.getProperties(), NOT_META_PROPS); |
| } |
| |
| @Override |
| public boolean hasChildNode(@NotNull String name) { |
| return delegate.hasChildNode(name); |
| } |
| |
| @NotNull |
| @Override |
| public NodeState getChildNode(@NotNull String name) throws IllegalArgumentException { |
| return decorate(name, delegate.getChildNode(name)); |
| } |
| |
| @NotNull |
| @Override |
| public Iterable<? extends ChildNodeEntry> getChildNodeEntries() { |
| return Iterables.transform(delegate.getChildNodeEntries(), new Function<ChildNodeEntry, ChildNodeEntry>() { |
| @Nullable |
| @Override |
| public ChildNodeEntry apply(ChildNodeEntry input) { |
| return new MemoryChildNodeEntry(input.getName(), decorate(input.getName(), input.getNodeState())); |
| } |
| }); |
| } |
| |
| @NotNull |
| @Override |
| public NodeBuilder builder() { |
| checkState(!getPath().isRoot(), "Builder cannot be opened for root " + |
| "path for state of type [%s]", delegate.getClass()); |
| return new MemoryNodeBuilder(this); |
| } |
| |
| //Following method should be overridden as default implementation in AbstractNodeState |
| //is not optimized |
| |
| @Override |
| public PropertyState getProperty(@NotNull String name) { |
| return delegate.getProperty(name); |
| } |
| |
| @Override |
| public long getPropertyCount() { |
| return Iterables.size(getProperties()); |
| } |
| |
| @Override |
| public boolean hasProperty(@NotNull String name) { |
| return delegate.hasProperty(name); |
| } |
| |
| @Override |
| public boolean getBoolean(@NotNull String name) { |
| return delegate.getBoolean(name); |
| } |
| |
| @Override |
| public long getLong(String name) { |
| return delegate.getLong(name); |
| } |
| |
| @Override |
| public String getString(String name) { |
| return delegate.getString(name); |
| } |
| |
| @NotNull |
| @Override |
| public Iterable<String> getStrings(@NotNull String name) { |
| return delegate.getStrings(name); |
| } |
| |
| @Override |
| public String getName(@NotNull String name) { |
| return delegate.getName(name); |
| } |
| |
| @NotNull |
| @Override |
| public Iterable<String> getNames(@NotNull String name) { |
| return delegate.getNames(name); |
| } |
| |
| @Override |
| public long getChildNodeCount(long max) { |
| return delegate.getChildNodeCount(max); |
| } |
| |
| @Override |
| public Iterable<String> getChildNodeNames() { |
| return delegate.getChildNodeNames(); |
| } |
| |
| //~--------------------------------------------< internal > |
| |
| private NodeState decorate(String nodeName, NodeState childNode) { |
| if (childNode.exists()) { |
| return new DelegatingDocumentNodeState(childNode, new Path(path, nodeName), rootRevision, |
| fromExternalChange, differ); |
| } |
| return childNode; |
| } |
| |
| private String getRequiredProp(String name){ |
| return getRequiredProp(delegate, name); |
| } |
| |
| private static String getRequiredProp(NodeState state, String name){ |
| return checkNotNull(state.getString(name), "No property [%s] found in [%s]", name, state); |
| } |
| } |