/*
 *  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.codehaus.groovy.tools.gse;

import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.TreeSet;

public class StringSetMap extends LinkedHashMap<String,Set<String>> {

    private static final long serialVersionUID = -8603734698633884431L;

    public StringSetMap() {
        super();
    }

    public StringSetMap(StringSetMap other) {
        for (String key : other.keySet()) {
            get(key).addAll(other.get(key));
        }
    }

    @Override
    public Set<String> get(Object o){
        String name = (String) o;
        Set<String> set = super.get(name);
        if (set==null) {
            set = new LinkedHashSet<String>();
            put(name,set);
        }
        return set;
    }

    public void makeTransitiveHull() {
        Set<String> nameSet = new TreeSet<String>(keySet());

        for (String k: nameSet) {
            StringSetMap delta = new StringSetMap();
            for (String i: nameSet) {
                for (String j: nameSet) {
                    Set<String> iSet = get(i);
                    if (iSet.contains(k) && get(k).contains(j)) {
                        delta.get(i).add(j);
                    }
                }
            }
            for (String i: nameSet) get(i).addAll(delta.get(i));
        }
    }
}
