abstractvisprovider.java

来自「jsr170接口的java实现。是个apache的开源项目。」· Java 代码 · 共 499 行 · 第 1/2 页

/*
 * 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.core.virtual;

import org.apache.jackrabbit.core.ItemId;
import org.apache.jackrabbit.core.NodeId;
import org.apache.jackrabbit.core.PropertyId;
import org.apache.jackrabbit.core.nodetype.EffectiveNodeType;
import org.apache.jackrabbit.core.nodetype.NodeDef;
import org.apache.jackrabbit.core.nodetype.NodeDefId;
import org.apache.jackrabbit.core.nodetype.NodeTypeConflictException;
import org.apache.jackrabbit.core.nodetype.NodeTypeRegistry;
import org.apache.jackrabbit.core.nodetype.PropDef;
import org.apache.jackrabbit.core.state.ItemState;
import org.apache.jackrabbit.core.state.ItemStateException;
import org.apache.jackrabbit.core.state.NoSuchItemStateException;
import org.apache.jackrabbit.core.state.NodeReferences;
import org.apache.jackrabbit.core.state.NodeReferencesId;
import org.apache.jackrabbit.core.state.NodeState;
import org.apache.jackrabbit.core.state.ItemStateReferenceMap;
import org.apache.jackrabbit.core.state.ItemStateListener;
import org.apache.jackrabbit.name.QName;
import org.apache.jackrabbit.uuid.UUID;
import org.apache.jackrabbit.util.WeakIdentityCollection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.jcr.RepositoryException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Collection;

/**
 * This Class implements a virtual item state provider, in order to expose the
 * versions to the version storage.
 */
public abstract class AbstractVISProvider implements VirtualItemStateProvider, ItemStateListener {
    /**
     * the default logger
     */
    private static Logger log = LoggerFactory.getLogger(AbstractVISProvider.class);

    /**
     * the root node
     */
    private VirtualNodeState root = null;

    /**
     * the root node id
     */
    protected final NodeId rootNodeId;

    /**
     * the node type registry
     */
    protected final NodeTypeRegistry ntReg;

    /**
     * the cache node states. key=ItemId, value=ItemState
     */
    private ItemStateReferenceMap nodes = new ItemStateReferenceMap();

    /**
     * Listeners (weak references)
     */
    private final transient Collection listeners = new WeakIdentityCollection(5);

    /**
     * Creates an abstract virtual item state provider
     *
     * @param ntReg
     * @param rootNodeId
     */
    public AbstractVISProvider(NodeTypeRegistry ntReg, NodeId rootNodeId) {
        this.ntReg = ntReg;
        this.rootNodeId = rootNodeId;
    }

    /**
     * Creates the root node state.
     *
     * @return
     * @throws RepositoryException
     */
    protected abstract VirtualNodeState createRootNodeState() throws RepositoryException;

    //-----------------------------------------------------< ItemStateManager >

    /**
     * {@inheritDoc}
     */
    public boolean hasItemState(ItemId id) {
        if (id instanceof NodeId) {
            if (nodes.contains(id)) {
                return true;
            } else if (id.equals(rootNodeId)) {
                return true;
            } else {
                return internalHasNodeState((NodeId) id);
            }
        } else {
            return internalHasPropertyState((PropertyId) id);
        }
    }

    /**
     * {@inheritDoc}
     */
    public ItemState getItemState(ItemId id)
            throws NoSuchItemStateException, ItemStateException {

        if (id instanceof NodeId) {
            ItemState s;
            if (nodes.contains(id)) {
                s = nodes.get(id);
            } else if (id.equals(rootNodeId)) {
                s = getRootState();
            } else {
                s = cache(internalGetNodeState((NodeId) id));
            }
            return s;
        } else {
            return internalGetPropertyState((PropertyId) id);
        }
    }

    /**
     * {@inheritDoc}
     */
    public NodeReferences getNodeReferences(NodeReferencesId id)
            throws NoSuchItemStateException, ItemStateException {
        throw new NoSuchItemStateException(id.toString());
    }

    /**
     * {@inheritDoc}
     */
    public boolean hasNodeReferences(NodeReferencesId id) {
        return false;
    }

    //-------------------------------------------< VirtualItemStateProvider >---

    /**
     * {@inheritDoc}
     */
    public boolean isVirtualRoot(ItemId id) {
        return id.equals(rootNodeId);
    }

    /**
     * {@inheritDoc}
     */
    public NodeId getVirtualRootId() {
        return rootNodeId;
    }

    /**
     * Returns the root state
     *
     * @return the root state
     */
    public synchronized NodeState getRootState() throws ItemStateException {
        try {
            if (root == null) {
                root = createRootNodeState();
            }
            return root;
        } catch (RepositoryException e) {
            throw new ItemStateException("Error creating root node state", e);
        }
    }

    /**
     * Checks if this provide has the node state of the given node id
     *
     * @param id
     * @return <code>true</code> if it has the node state
     */
    protected abstract boolean internalHasNodeState(NodeId id);

    /**
     * Retrieves the node state with the given node id
     *
     * @param id
     * @return
     * @throws NoSuchItemStateException
     * @throws ItemStateException
     */
    protected abstract VirtualNodeState internalGetNodeState(NodeId id)
            throws NoSuchItemStateException, ItemStateException;

    /**
     * Checks if this provider has the property state of the given id.
     *
     * @param id
     * @return <code>true</code> if it has the property state
     */
    protected boolean internalHasPropertyState(PropertyId id) {

        try {
            // get parent state
            NodeState parent = (NodeState) getItemState(id.getParentId());

            // handle some default prop states
            if (parent instanceof VirtualNodeState) {
                return parent.hasPropertyName(id.getName());
            }
        } catch (ItemStateException e) {
            // ignore
        }
        return false;
    }

    /**
     * Retrieces the property state for the given id
     *
     * @param id
     * @return
     * @throws NoSuchItemStateException
     * @throws ItemStateException
     */
    protected VirtualPropertyState internalGetPropertyState(PropertyId id)
            throws NoSuchItemStateException, ItemStateException {

        // get parent state
        NodeState parent = (NodeState) getItemState(id.getParentId());

        // handle some default prop states
        if (parent instanceof VirtualNodeState) {
            return ((VirtualNodeState) parent).getProperty(id.getName());
        }
        throw new NoSuchItemStateException(id.toString());
    }

    /**