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/*
 * Copyright 2010 Red Hat, Inc.
 * 
 * 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.commonjava.emb.plexus;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

public class ComponentSelector
{

    private Map, ComponentKey> remappedComponentHints =
        new HashMap, ComponentKey>();

    public ComponentSelector()
    {
    }

    public ComponentSelector merge( final ComponentSelector selectorToCopy )
    {
        if ( selectorToCopy != null && !selectorToCopy.isEmpty() )
        {
            final Map, ComponentKey> result = new HashMap, ComponentKey>();
            result.putAll( selectorToCopy.remappedComponentHints );

            if ( !remappedComponentHints.isEmpty() )
            {
                result.putAll( remappedComponentHints );
            }

            remappedComponentHints = result;
        }

        return this;
    }

    public boolean isEmpty()
    {
        return remappedComponentHints.isEmpty();
    }

    public  boolean hasOverride( final Class role, final String hint )
    {
        final ComponentKey check = new ComponentKey( role, hint );
        return remappedComponentHints.containsKey( check );
    }

    public  boolean hasOverride( final Class role )
    {
        final ComponentKey check = new ComponentKey( role );
        return remappedComponentHints.containsKey( check );
    }

    public Set> getKeysOverriddenBy( final Class role, final String hint )
    {
        @SuppressWarnings( { "rawtypes", "unchecked" } )
        final ComponentKey check = new ComponentKey( role, hint );

        final Set> result = new HashSet>();
        for ( final Map.Entry, ComponentKey> mapping : remappedComponentHints.entrySet() )
        {
            if ( mapping.getValue().equals( check ) )
            {
                result.add( mapping.getKey() );
            }
        }

        return result;
    }

    public  ComponentSelector setSelection( final ComponentKey originalKey, final String newHint )
    {
        remappedComponentHints.put( originalKey, new ComponentKey( originalKey.getRoleClass(), newHint ) );
        return this;
    }

    public  ComponentSelector setSelection( final Class role, final String oldHint, final String newHint )
    {
        final ComponentKey originalKey = new ComponentKey( role, oldHint );
        remappedComponentHints.put( originalKey, new ComponentKey( role, newHint ) );
        return this;
    }

    public  ComponentSelector setSelection( final Class role, final String newHint )
    {
        final ComponentKey originalKey = new ComponentKey( role );
        remappedComponentHints.put( originalKey, new ComponentKey( role, newHint ) );
        return this;
    }

}