org.tzi.use.gen.assl.statics.GInstructionCreator.java Source code

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Here is the source code for org.tzi.use.gen.assl.statics.GInstructionCreator.java

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/*
 * This is source code of the Snapshot Generator, an extension for USE
 * to generate (valid) system states of UML models.
 * Copyright (C) 2001 Joern Bohling, University of Bremen
 *
 * About USE:
 *   USE - UML based specification environment
 *   Copyright (C) 1999,2000,2001 Mark Richters, University of Bremen
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package org.tzi.use.gen.assl.statics;

import java.util.List;

import org.tzi.use.uml.mm.MModel;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;

/**
 * @see org.tzi.use.gen.assl.statics
 * @author  Joern Bohling
 */
public class GInstructionCreator {
    private ListMultimap<String, IGInstructionMatcher> matchermap = null;

    /**
     * A handle to the unique Singleton instance.
     */
    private static GInstructionCreator _instance = null;

    private GInstructionCreator() {
        IGInstructionMatcher matcherlist[] = { new GMatcherCreate_C(), new GMatcherAny_Seq(), new GMatcherSub_Seq(),
                new GMatcherTry_Seq(), new GMatcherCreateN_C_Integer(), new GMatcherDelete_Object(), //disabled, because references
                //    to deleted objects would not be updated.
                new GMatcherInsert_Assoc_Linkends(), new GMatcherDelete_Assoc_Linkends(),
                new GMatcherTry_Attribute(), new GMatcherTry_Assoc_LinkendSeqs(),
                new GMatcherTry_AssocClass_LinkendSeqs(), new GMatcherSub_Seq_Integer(), new GMatcherCreate_AC() };
        matchermap = ArrayListMultimap.create();
        for (int i = 0; i < matcherlist.length; i++)
            matchermap.put(matcherlist[i].name(), matcherlist[i]);
    }

    /**
     * @return The unique instance of this class.
     */
    public static GInstructionCreator instance() {
        if (null == _instance)
            _instance = new GInstructionCreator();
        return _instance;
    }

    /**
     * 
     * @param name
     * @param params A list of strings or expressions. 
     * String values are class or association names
     * @param model
     * @return
     */
    public GInstruction create(String name, List<Object> params, MModel model) {
        // search by instruction symbol
        List<IGInstructionMatcher> instructions = matchermap.get(name);
        if (instructions.isEmpty()) // unknown instruction symbol
            return null;

        // search overloaded instructions for a match
        for (IGInstructionMatcher i : instructions) {
            GInstruction result = i.createIfMatches(params, model);
            if (result != null)
                return result;
        }

        return null;
    }
}