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Mathematics utility library.
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/*
 * DomainContext.java
 * Created Apr 2010
 */

package com.googlecode.blaisemath.coordinate;

/*
 * #%L
 * BlaiseMath
 * --
 * Copyright (C) 2009 - 2015 Elisha Peterson
 * --
 * 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.
 * #L%
 */

import java.util.HashMap;

/**
 * Keeps track of a collection of domains identified by strings. Intended to be used
 * for interested objects to retrieve a particular domain.
 * 
 * @author Elisha Peterson
 */
public class DomainContext {

    /** Table that stores the domains. */
    HashMap entries;

    /** Construct with no entries. */
    public DomainContext() {
        entries = new HashMap();
    }

    /**
     * Add an entry to the domain context.
     * @param 
     * @param id
     * @param domain
     * @param cls 
     */
    public  void addEntry(String id, Domain domain, Class cls) {
        entries.put(id, new DomainEntry(domain, cls));
    }

    /**
     * Remove an entry from the domain context.
     * @param  
     * @param id 
     */
    public  void removeEntry(String id) {
        entries.remove(id);
    }

    /**
     * Attempts to find a sampler of the given identifier and class type. Looks through the table of
     * entries to find the property generator. Returns null if the table has no sampler with
     * matching id, or if that sampler does not have the requisite class type.
     *
     * @param  class type of the sampler
     * @param cls class identifier of the sampler
     * @param id identifier of the sampler
     * @return the found sample generator, or null if it cannot be found.     */

    public  Domain getDomain(String id, Class cls) {
        DomainEntry en = entries.get(id);
        if (en != null && en.cls == cls)
            return en.gen;
        return null;
    }




    /** Class used to store entries, consisting of a domain and its underlying class. */
    static class DomainEntry {
        Domain gen;
        Class cls;
        public  DomainEntry(Domain gen, Class cls) {
            this.gen = gen;
            this.cls = cls;
        }
    }
}