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AnyTagFilter.java
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AnyTagFilter.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.causalclustering.load_balancing.plugins.server_policies;
import java.util.Objects;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import org.neo4j.causalclustering.load_balancing.filters.Filter;
import static org.neo4j.helpers.collection.Iterators.asSet;
/**
* Only returns servers matching any of the supplied tags.
*/
public class AnyTagFilter implements Filter<ServerInfo>
{
private final Predicate<ServerInfo> matchesAnyTag;
private final Set<String> tags;
AnyTagFilter( String... tags )
{
this( asSet( tags ) );
}
AnyTagFilter( Set<String> tags )
{
this.matchesAnyTag = serverInfo ->
{
for ( String tag : serverInfo.tags() )
{
if ( tags.contains( tag ) )
{
return true;
}
}
return false;
};
this.tags = tags;
}
@Override
public Set<ServerInfo> apply( Set<ServerInfo> data )
{
return data.stream().filter( matchesAnyTag ).collect( Collectors.toSet() );
}
@Override
public boolean equals( Object o )
{
if ( this == o )
{ return true; }
if ( o == null || getClass() != o.getClass() )
{ return false; }
AnyTagFilter that = (AnyTagFilter) o;
return Objects.equals( tags, that.tags );
}
@Override
public int hashCode()
{
return Objects.hash( tags );
}
@Override
public String toString()
{
return "AnyTagFilter{" +
"tags=" + tags +
'}';
}
}