    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}