/*
* 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.version;
import java.util.Map;
import javax.jcr.RepositoryException;
import org.apache.jackrabbit.core.id.NodeId;
/**
* This Class implements a version selector that is based on a set of versions.
*/
public class VersionSet implements VersionSelector {
/**
* the internal changeset
*/
private final Map<NodeId, InternalVersion> versions;
/**
* fallback flag
*/
private final boolean dateFallback;
/**
* Creates a <code>ChangeSetVersionSelector</code> that will try to select a
* version within the given set of versions.
*
* @param versions the set of versions
*/
public VersionSet(Map<NodeId, InternalVersion> versions) {
this(versions, false);
}
/**
* Creates a <code>ChangeSetVersionSelector</code> that will try to select a
* version in the given set.
*
* @param versions the set of versions
* @param dateFallback if <code>true</code> date fallback is enabled.
*/
public VersionSet(Map<NodeId, InternalVersion> versions, boolean dateFallback) {
this.versions = versions;
this.dateFallback = dateFallback;
}
/**
* Returns the (modifiable) changeset of this selector. the keys of the
* map are the node ids of the version histories.
* @return the change set
*/
public Map<NodeId, InternalVersion> versions() {
return versions;
}
/**
* {@inheritDoc}
*
* Selects a version from set having the given version history.
*/
public InternalVersion select(InternalVersionHistory versionHistory)
throws RepositoryException {
InternalVersion v = versions.get(versionHistory.getId());
if (v == null && dateFallback) {
// select latest one
v = DateVersionSelector.selectByDate(versionHistory, null);
}
return v;
}
}