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/*
* ====================================================================
* Copyright (c) 2000-2008 SyntEvo GmbH, [email protected]
* All rights reserved.
*
* This software is licensed as described in the file SEQUENCE-LICENSE,
* which you should have received as part of this distribution. Use is
* subject to license terms.
* ====================================================================
*/
package de.regnis.q.sequence.core;
/**
* @author Marc Strapetz
*/
abstract class QSequenceDeePathExtender {
// Abstract ===============================================================
protected abstract int getNextX(QSequenceDeePathExtenderArray xs, int diagonal, int dee);
protected abstract int getSnakeX(QSequenceMedia media, int x, int y) throws QSequenceException;
protected abstract void reset(QSequenceMedia media, QSequenceDeePathExtenderArray xs);
public abstract int getProgress(int diagonal);
// Fields =================================================================
private final QSequenceDeePathExtenderArray xs;
private int snakeStartLeft;
private int snakeStartRight;
// Setup ==================================================================
protected QSequenceDeePathExtender(QSequenceDeePathExtenderArray xs) {
this.xs = xs;
}
// Accessing ==============================================================
public final int getLeft(int diagonal) {
return xs.get(diagonal);
}
public final int getRight(int diagonal) {
return xs.get(diagonal) - diagonal;
}
public final int getSnakeStartLeft() {
return snakeStartLeft;
}
public final int getSnakeStartRight() {
return snakeStartRight;
}
public final void extendDeePath(QSequenceMedia media, int dee, int diagonal) throws QSequenceException {
int x = getNextX(xs, diagonal, dee);
int y = x - diagonal;
snakeStartLeft = x;
snakeStartRight = y;
x = getSnakeX(media, x, y);
y = x - diagonal;
xs.set(diagonal, x);
}
public final void reset(QSequenceMedia media) {
reset(media, xs);
}
public final void print(QSequenceMedia media, int fromDiagonal, int toDiagonal) {
final StringBuffer[] lines = new StringBuffer[media.getRightLength() + 1];
for (int line = 0; line < lines.length; line++) {
lines[line] = new StringBuffer(media.getLeftLength() + 1);
lines[line].append('.');
for (int ch = 0; ch < media.getLeftLength(); ch++) {
lines[line].append(line >= 1 && line <= media.getRightLength() ? '*' : '.');
}
}
for (int diagonal = fromDiagonal; diagonal <= toDiagonal; diagonal++) {
final int left = getLeft(diagonal);
final int right = getRight(diagonal);
if (left < 0 || right < 0 || right >= lines.length || left >= lines[right].length()) {
continue;
}
lines[right].setCharAt(left, String.valueOf(Math.abs(diagonal % 9)).charAt(0));
}
}
}
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