core/src/main/java/org/apache/sling/cms/core/models/VersionInfo.java

/*
 * 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.sling.cms.core.models;

import java.util.ArrayList;
import java.util.List;

import javax.jcr.Node;
import javax.jcr.RepositoryException;
import javax.jcr.version.Version;
import javax.jcr.version.VersionHistory;
import javax.jcr.version.VersionIterator;

import org.apache.jackrabbit.JcrConstants;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.models.annotations.Model;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Returns all of the versions for a Resource. At the moment only JCR nodes are
 * supported.
 */
@Model(adaptables = { Resource.class })
public class VersionInfo {

    private static final Logger log = LoggerFactory.getLogger(VersionInfo.class);

    private Resource resource;

    public VersionInfo(Resource resource) {
        this.resource = resource;
    }

    public List<Version> getVersions() {
        List<Version> versions = new ArrayList<>();
        final Node node = resource.adaptTo(Node.class);
        try {
            if (node != null && node.isNodeType(JcrConstants.MIX_VERSIONABLE)) {
                final VersionHistory history = node.getSession().getWorkspace().getVersionManager()
                        .getVersionHistory(node.getPath());
                for (final VersionIterator it = history.getAllVersions(); it.hasNext();) {
                    final Version v = it.nextVersion();
                    versions.add(v);
                }
            }
        } catch (RepositoryException e) {
            log.warn("Exception retrieving version history for: " + resource, e);
        }
        return versions;
    }
}