com.lastcalc.engines.FixedOrderParserPickerFactory.java Source code

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Here is the source code for com.lastcalc.engines.FixedOrderParserPickerFactory.java

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/*******************************************************************************
 * LastCalc - The last calculator you'll ever need
 * Copyright (C) 2011, 2012 Uprizer Labs LLC
 * 
 * This program is free software: you can redistribute it and/or modify it 
 * under the terms of the GNU Affero General Public License as published 
 * by the Free Software Foundation, either version 3 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 Affero General Public License for more 
 * details.
 ******************************************************************************/
package com.lastcalc.engines;

import java.util.*;

import com.google.common.collect.Lists;

import com.lastcalc.parsers.*;

public class FixedOrderParserPickerFactory extends ParserPickerFactory {
    private static final long serialVersionUID = -2346529366052255216L;
    private final LinkedList<Parser> parsers;

    public FixedOrderParserPickerFactory(final Parser... parsers) {
        this.parsers = Lists.newLinkedList(Lists.newArrayList(parsers));
    }

    public FixedOrderParserPickerFactory(final LinkedList<Parser> parsers) {
        this.parsers = parsers;
    }

    @Override
    public void addParser(final Parser parser) {
        parsers.add(parser);
    }

    @Override
    public ParserPicker getPicker(final Map<Attempt, Integer> prevAttemptPos) {
        return new FixedOrderParserPicker(prevAttemptPos, parsers);
    }

    @Override
    public void teach(final Iterable<ParseStep> step) {
        // Noop
    }

    public static class FixedOrderParserPicker extends ParserPicker {

        private final Iterable<Parser> parsers;

        public FixedOrderParserPicker(final Map<Attempt, Integer> prevAttemptPos, final Iterable<Parser> parsers) {
            super(prevAttemptPos);
            this.parsers = parsers;
        }

        @Override
        public ParseStep pickNext(final ParserContext context, final ParseStep previous) {
            final ParseStep next = getNext(context, parsers, previous);
            return next;
        }

    }

    public List<Parser> getParsers() {
        return parsers;
    }

}