/**
* 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.hadoop.hbase.replication;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.wal.WAL.Entry;
/**
* A {@link WALEntryFilter} which contains multiple filters and applies them
* in chain order
*/
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.REPLICATION)
public class ChainWALEntryFilter implements WALEntryFilter {
private final WALEntryFilter[] filters;
public ChainWALEntryFilter(WALEntryFilter...filters) {
this.filters = filters;
}
public ChainWALEntryFilter(List<WALEntryFilter> filters) {
ArrayList<WALEntryFilter> rawFilters = new ArrayList<WALEntryFilter>(filters.size());
// flatten the chains
for (WALEntryFilter filter : filters) {
if (filter instanceof ChainWALEntryFilter) {
Collections.addAll(rawFilters, ((ChainWALEntryFilter) filter).filters);
} else {
rawFilters.add(filter);
}
}
this.filters = rawFilters.toArray(new WALEntryFilter[rawFilters.size()]);
}
@Override
public Entry filter(Entry entry) {
for (WALEntryFilter filter : filters) {
if (entry == null) {
return null;
}
entry = filter.filter(entry);
}
return entry;
}
}