001// Copyright 2012 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.internal.services.compatibility;
016
017import org.apache.tapestry5.services.compatibility.Compatibility;
018import org.apache.tapestry5.services.compatibility.Trait;
019
020import java.util.EnumSet;
021import java.util.Map;
022
023public class CompatibilityImpl implements Compatibility
024{
025    private final EnumSet<Trait> traits;
026
027    public CompatibilityImpl(Map<Trait, Boolean> configuration)
028    {
029        // Since the default in 5.4 is true, we can just remove those for which the value is false.
030
031        traits = EnumSet.allOf(Trait.class);
032
033        for (Map.Entry<Trait, Boolean> entry : configuration.entrySet())
034        {
035            if (entry.getValue().equals(Boolean.FALSE))
036            {
037                traits.remove(entry.getKey());
038            }
039        }
040    }
041
042    public boolean enabled(Trait trait)
043    {
044        assert trait != null;
045
046        return traits.contains(trait);
047    }
048}