de.rnd7.kata.reversi.logic.ai.AIMatrix.java Source code

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Here is the source code for de.rnd7.kata.reversi.logic.ai.AIMatrix.java

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/**
 * Copyright 2016 Philipp Arndt
 *
 * 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 de.rnd7.kata.reversi.logic.ai;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.io.IOUtils;
import org.apache.commons.io.LineIterator;
import org.apache.commons.lang3.CharEncoding;

import de.rnd7.kata.reversi.model.Coordinate;

public class AIMatrix {

    private final Map<Coordinate, Integer> map = new HashMap<>();

    AIMatrix() {
    }

    public static AIMatrix empty() {
        return new AIMatrix();
    }

    public static AIMatrix fromResource(final String name) throws IOException {
        final AIMatrix matrix = new AIMatrix();

        try (InputStream input = AIMatrix.class.getResourceAsStream(name)) {
            final LineIterator iterator = IOUtils.lineIterator(input, CharEncoding.UTF_8);

            int lineNumber = 0;
            while (iterator.hasNext()) {
                processLine(matrix, lineNumber++, iterator.next());
            }
        }

        return matrix;
    }

    private static void processLine(final AIMatrix matrix, final int y, final String line) {
        int x = 0;
        for (final char ch : line.toCharArray()) {
            final int weight;
            if (Character.isLowerCase(ch)) {
                weight = -Character.toUpperCase(ch);
            } else {
                weight = ch;
            }

            matrix.set(new Coordinate(x++, y), weight);
        }
    }

    private void set(final Coordinate coordinate, final int weight) {
        this.map.put(coordinate, weight);
    }

    public int get(final Coordinate coordinate) {
        final Integer result = this.map.get(coordinate);
        return result == null ? 0 : result;
    }
}