/*
* Copyright 2004-2009 the original author or authors.
*
* Licensed 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.compass.core.lucene.engine.transaction.support;
import org.compass.core.lucene.engine.transaction.support.job.TransactionJob;
import org.compass.core.spi.ResourceKey;
import org.compass.core.util.CollectionUtils;
/**
* Hasing of resources with helper methods to compute the hash.
*
* @author kimchy
*/
public enum ResourceHashing {
UID,
SUBINDEX;
public int hash(ResourceKey resourceKey) {
switch (this) {
case UID:
return CollectionUtils.absHash(resourceKey.buildUID());
case SUBINDEX:
return CollectionUtils.absHash(resourceKey.getSubIndex());
}
throw new IllegalStateException("Intenral error in Compass");
}
public int hash(TransactionJob job) {
if (job.getResourceUID() == null) {
// in such cases, we always do it by sub index
return CollectionUtils.absHash(job.getSubIndex());
}
switch (this) {
case UID:
return CollectionUtils.absHash(job.getResourceUID());
case SUBINDEX:
return CollectionUtils.absHash(job.getSubIndex());
}
throw new IllegalStateException("Intenral error in Compass");
}
public static ResourceHashing fromName(String name) {
if ("uid".equalsIgnoreCase(name)) {
return UID;
} else if ("subindex".equalsIgnoreCase(name)) {
return SUBINDEX;
}
throw new IllegalArgumentException("No resource hashing found for [" + name + "]");
}
}