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OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains the examples which demonstrate how to use it in a normal Java application.

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/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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.
 */

package org.optaplanner.examples.scrabble.persistence;

import java.io.IOException;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Locale;

import org.optaplanner.examples.common.persistence.AbstractTxtSolutionImporter;
import org.optaplanner.examples.common.persistence.SolutionConverter;
import org.optaplanner.examples.scrabble.app.ScrabbleApp;
import org.optaplanner.examples.scrabble.domain.ScrabbleCell;
import org.optaplanner.examples.scrabble.domain.ScrabbleSolution;
import org.optaplanner.examples.scrabble.domain.ScrabbleWordAssignment;

public class ScrabbleImporter extends AbstractTxtSolutionImporter {

    public static void main(String[] args) {
        SolutionConverter converter = SolutionConverter.createImportConverter(
                ScrabbleApp.DATA_DIR_NAME, new ScrabbleImporter(), ScrabbleSolution.class);
        converter.convert("jbossProjects.txt", "jbossProjects.xml");
    }

    @Override
    public TxtInputBuilder createTxtInputBuilder() {
        return new ScrabbleInputBuilder();
    }

    public static class ScrabbleInputBuilder extends TxtInputBuilder {

        private ScrabbleSolution solution;
        private Locale locale;

        @Override
        public ScrabbleSolution readSolution() throws IOException {
            solution = new ScrabbleSolution();
            solution.setId(0L);
            locale = Locale.forLanguageTag(readStringValue("locale:"));
            readCellList();
            readWordList();
            BigInteger possibleSolutionSize = BigInteger.valueOf(solution.getCellList().size()).pow(
                    solution.getWordList().size());
            logger.info("ScrabbleSolution {} has {} words and {} cells with a search space of {}.",
                    getInputId(),
                    solution.getWordList().size(),
                    solution.getCellList().size(),
                    getFlooredPossibleSolutionSize(possibleSolutionSize));
            return solution;
        }

        private void readCellList() throws IOException {
            int gridWidth = readIntegerValue("gridWidth:");
            solution.setGridWidth(gridWidth);
            int gridHeight = readIntegerValue("gridHeight:");
            solution.setGridHeight(gridHeight);
            List cellList = new ArrayList<>(gridWidth * gridHeight);
            for (int x = 0; x < gridWidth; x++) {
                for (int y = 0; y < gridHeight; y++) {
                    ScrabbleCell cell = new ScrabbleCell();
                    cell.setId((long) (y * gridWidth + x));
                    cell.setX(x);
                    cell.setY(y);
                    cell.setWordSet(new LinkedHashSet<>());
                    cell.setCharacterCountMap(new LinkedHashMap<>());
                    cellList.add(cell);
                }
            }
            solution.setCellList(cellList);
        }

        private void readWordList() throws IOException {
            readConstantLine("# Words");
            List wordList = new ArrayList<>();
            String line = bufferedReader.readLine();
            long wordId = 0L;
            while (line != null) {
                String word = line.trim();
                if (!word.isEmpty()) {
                    ScrabbleWordAssignment wordAssignment = new ScrabbleWordAssignment();
                    wordAssignment.setId(wordId);
                    wordId++;
                    wordAssignment.setSolution(solution);
                    // Add spaces to enforce an empty cell before and after each word
                    wordAssignment.setWord(" " + word.toUpperCase(locale) + " ");
                    wordList.add(wordAssignment);
                }
                line = bufferedReader.readLine();
            }
            solution.setWordList(wordList);
        }

    }

}