boil/library/TypeFactory.java


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package boil.library;

import java.util.HashMap;

public class TypeFactory {

    private int type_num;
    private HashMap<String,String> map;

    public void reset() {
        this.type_num = 0;
        this.map = new HashMap<>();
    }

    public String alias(String t) {
        /**
         * Given a TypeInstance, return the designated
         * vapor alias. If the alias does not exist, create it.
         */
        String alias;
        if ((alias = this.map.get(t)) == null) {
            alias = String.format("t.%d", this.type_num++);
            this.map.put(t, alias);
        }

        return alias;
    }

    public String retrieveRecentList(int x) {
        /**
         * Given int x, retrieve a space-delimited
         * list of the x most recent entries.
         */
        String rtn = "";
        if (x > 0) {
            rtn += String.format("t.%d",
                                 type_num-x);
            for (int i = type_num-(x-1); i < type_num; ++i) {
                rtn += String.format(" t.%d",
                                     i);
            }
        }

        return rtn;
    }
}