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Minecraft mapping and rendering tool

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/* Copyright (c) 2013 Jesper Öqvist 
 *
 * This file is part of Chunky.
 *
 * Chunky is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Chunky 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with Chunky.  If not, see .
 */
package se.llbit.chunky.resources.texturepack;

import se.llbit.chunky.resources.BitmapImage;

import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipFile;

/**
 * An alternate texture will try loading several textures,
 * and only fail if none of them could be loaded.
 *
 * @author Jesper Öqvist 
 */
public class AlternateTextures extends TextureRef {

  private final TextureRef[] alternatives;

  /**
   * Attempts to load textures until one is successfully loaded.
   *
   * @param alternatives List of textures to load
   */
  public AlternateTextures(TextureRef... alternatives) {
    this.alternatives = alternatives;
  }

  @Override public boolean load(ZipFile texturePack) {
    for (TextureRef alternative : alternatives) {
      if (alternative.load(texturePack)) {
        return true;
      }
    }
    return false;
  }

  @Override public boolean loadFromTerrain(BitmapImage[] terrain) {
    for (TextureRef alternative : alternatives) {
      if (alternative.loadFromTerrain(terrain)) {
        return true;
      }
    }
    return false;
  }

  @Override protected boolean load(InputStream imageStream) throws IOException {
    throw new UnsupportedOperationException("Call load(ZipFile) instead!");
  }

}