| /* |
| * 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.core; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static org.apache.jackrabbit.oak.commons.PathUtils.elements; |
| import static org.apache.jackrabbit.oak.commons.PathUtils.isAbsolute; |
| |
| 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.core.MutableRoot.Move; |
| import org.apache.jackrabbit.oak.plugins.tree.impl.AbstractMutableTree; |
| import org.apache.jackrabbit.oak.spi.state.NodeBuilder; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| final class MutableTree extends AbstractMutableTree { |
| |
| /** |
| * Underlying {@code Root} of this {@code Tree} instance |
| */ |
| private final MutableRoot root; |
| |
| /** |
| * Parent of this tree. Null for the root. |
| */ |
| private MutableTree parent; |
| |
| /** |
| * Name of the tree |
| */ |
| private String name; |
| |
| private NodeBuilder nodeBuilder; |
| |
| /** Pointer into the list of pending moves */ |
| private Move pendingMoves; |
| |
| MutableTree(@NotNull MutableRoot root, @NotNull NodeBuilder nodeBuilder, |
| @NotNull Move pendingMoves) { |
| this(root, pendingMoves, null, nodeBuilder, ""); |
| } |
| |
| private MutableTree(@NotNull MutableRoot root, @NotNull Move pendingMoves, |
| @Nullable MutableTree parent, @NotNull NodeBuilder nodeBuilder, @NotNull String name) { |
| this.root = checkNotNull(root); |
| this.parent = parent; |
| this.name = checkNotNull(name); |
| this.nodeBuilder = nodeBuilder; |
| this.pendingMoves = checkNotNull(pendingMoves); |
| } |
| |
| //------------------------------------------------------------< AbstractMutableTree >--- |
| |
| @Override |
| @Nullable |
| protected AbstractMutableTree getParentOrNull() { |
| return parent; |
| } |
| |
| @NotNull |
| @Override |
| protected NodeBuilder getNodeBuilder() { |
| return nodeBuilder; |
| } |
| |
| //-----------------------------------------------------< AbstractTree >--- |
| |
| @Override |
| @NotNull |
| protected MutableTree createChild(@NotNull String name) throws IllegalArgumentException { |
| return new MutableTree(root, pendingMoves, this, |
| nodeBuilder.getChildNode(checkNotNull(name)), name); |
| } |
| |
| //------------------------------------------------------------< Tree >--- |
| |
| @Override |
| @NotNull |
| public String getName() { |
| beforeRead(); |
| return name; |
| } |
| |
| @Override |
| @NotNull |
| public String getPath() { |
| beforeRead(); |
| return super.getPath(); |
| } |
| |
| @Override |
| @NotNull |
| public Status getStatus() { |
| beforeRead(); |
| return super.getStatus(); |
| } |
| |
| @Override |
| public boolean exists() { |
| beforeRead(); |
| return super.exists(); |
| } |
| |
| @Override |
| public PropertyState getProperty(@NotNull String name) { |
| beforeRead(); |
| return super.getProperty(checkNotNull(name)); |
| } |
| |
| @Override |
| public boolean hasProperty(@NotNull String name) { |
| beforeRead(); |
| return super.hasProperty(checkNotNull(name)); |
| } |
| |
| @Override |
| public long getPropertyCount() { |
| beforeRead(); |
| return super.getPropertyCount(); |
| } |
| |
| @Override |
| @Nullable |
| public Status getPropertyStatus(@NotNull String name) { |
| beforeRead(); |
| return super.getPropertyStatus(checkNotNull(name)); |
| } |
| |
| @Override |
| @NotNull |
| public Iterable<? extends PropertyState> getProperties() { |
| beforeRead(); |
| return super.getProperties(); |
| } |
| |
| @Override |
| @NotNull |
| public Tree getChild(@NotNull String name) { |
| beforeRead(); |
| return super.getChild(checkNotNull(name)); |
| } |
| |
| @Override |
| public boolean hasChild(@NotNull String name) { |
| beforeRead(); |
| return super.hasChild(checkNotNull(name)); |
| } |
| |
| @Override |
| public long getChildrenCount(long max) { |
| beforeRead(); |
| return super.getChildrenCount(max); |
| } |
| |
| @Override |
| @NotNull |
| public Iterable<Tree> getChildren() { |
| beforeRead(); |
| return super.getChildren(); |
| } |
| |
| @Override |
| public boolean remove() { |
| beforeWrite(); |
| boolean success = super.remove(); |
| if (success) { |
| root.updated(); |
| } |
| return success; |
| } |
| |
| @Override |
| @NotNull |
| public Tree addChild(@NotNull String name) { |
| beforeWrite(); |
| Tree child; |
| if (hasChild(name)) { |
| child = createChild(name); |
| } else { |
| child = super.addChild(name); |
| root.updated(); |
| } |
| return child; |
| } |
| |
| @Override |
| public void setOrderableChildren(boolean enable) { |
| beforeWrite(); |
| super.setOrderableChildren(enable); |
| } |
| |
| @Override |
| public boolean orderBefore(@Nullable String name) { |
| beforeWrite(); |
| boolean success = super.orderBefore(name); |
| if (success) { |
| root.updated(); |
| } |
| return success; |
| } |
| |
| @Override |
| public void setProperty(@NotNull PropertyState property) { |
| beforeWrite(); |
| super.setProperty(property); |
| root.updated(); |
| } |
| |
| @Override |
| public <T> void setProperty(@NotNull String name, @NotNull T value) { |
| beforeWrite(); |
| super.setProperty(name, value); |
| root.updated(); |
| } |
| |
| @Override |
| public <T> void setProperty(@NotNull String name, @NotNull T value, @NotNull Type<T> type) { |
| beforeWrite(); |
| super.setProperty(name, value, type); |
| root.updated(); |
| } |
| |
| @Override |
| public void removeProperty(@NotNull String name) { |
| beforeWrite(); |
| super.removeProperty(name); |
| root.updated(); |
| } |
| |
| //---------------------------------------------------------< internal >--- |
| /** |
| * Set the parent and name of this tree. |
| * @param parent parent of this tree |
| * @param name name of this tree |
| */ |
| void setParentAndName(@NotNull MutableTree parent, @NotNull String name) { |
| this.name = checkNotNull(name); |
| this.parent = checkNotNull(parent); |
| } |
| |
| /** |
| * Move this tree to the parent at {@code destParent} with the new name |
| * {@code newName}. |
| * @param newParent new parent for this tree |
| * @param newName new name for this tree |
| */ |
| boolean moveTo(@NotNull MutableTree newParent, @NotNull String newName) { |
| name = checkNotNull(newName); |
| parent = checkNotNull(newParent); |
| boolean success = nodeBuilder.moveTo(newParent.nodeBuilder, newName); |
| if (success) { |
| parent.updateChildOrder(false); |
| newParent.updateChildOrder(false); |
| } |
| return success; |
| } |
| |
| /** |
| * Get a possibly non existing tree. |
| * @param path the path to the tree |
| * @return a {@link Tree} instance for the child at {@code path}. |
| */ |
| @NotNull |
| MutableTree getTree(@NotNull String path) { |
| checkArgument(isAbsolute(checkNotNull(path))); |
| beforeRead(); |
| MutableTree child = this; |
| for (String name : elements(path)) { |
| child = new MutableTree(root, pendingMoves, child, child.nodeBuilder.getChildNode(name), name); |
| } |
| return child; |
| } |
| |
| @NotNull |
| String getPathInternal() { |
| if (parent == null) { |
| return "/"; |
| } else { |
| StringBuilder sb = new StringBuilder(); |
| buildPath(sb); |
| return sb.toString(); |
| } |
| } |
| |
| @Override |
| protected void buildPath(@NotNull StringBuilder sb) { |
| if (parent != null) { |
| parent.buildPath(checkNotNull(sb)); |
| sb.append('/').append(name); |
| } |
| } |
| |
| //------------------------------------------------------------< private >--- |
| |
| private void reconnect() { |
| if (parent != null) { |
| parent.reconnect(); |
| nodeBuilder = parent.nodeBuilder.getChildNode(name); |
| } |
| } |
| |
| /** |
| * Verifies that this session is still alive and applies any pending |
| * moves that might affect this node. This method needs to be called |
| * at the beginning of all public read-only {@link Tree} methods to |
| * guarantee a consistent view of the tree. See {@link #beforeWrite()} |
| * for the equivalent method for write operations. |
| * |
| * @throws IllegalStateException if this session is closed |
| */ |
| private void beforeRead() throws IllegalStateException { |
| root.checkLive(); |
| if (applyPendingMoves()) { |
| reconnect(); |
| } |
| } |
| |
| /** |
| * Like {@link #beforeRead()} but also checks that (after any pending |
| * moves have been applied) the current node exists and is visible. |
| * This method needs to be called at the beginning of all public |
| * {@link Tree} methods that modify this node to guarantee a consistent |
| * view of the tree and to throw an exception whenever there's an |
| * attempt to modify a missing node. |
| * |
| * @throws IllegalStateException if this node does not exist or |
| * if this session is closed |
| */ |
| private void beforeWrite() throws IllegalStateException { |
| beforeRead(); |
| if (!super.exists()) { |
| throw new IllegalStateException("This tree does not exist"); |
| } |
| } |
| |
| private boolean applyPendingMoves() { |
| boolean movesApplied = false; |
| if (parent != null) { |
| movesApplied = parent.applyPendingMoves(); |
| } |
| Move old = pendingMoves; |
| pendingMoves = pendingMoves.apply(this); |
| if (pendingMoves != old) { |
| movesApplied = true; |
| } |
| return movesApplied; |
| } |
| |
| } |