SkeletonDataLoader.java

package com.siondream.core.spine;

import com.badlogic.gdx.assets.AssetDescriptor;
import com.badlogic.gdx.assets.AssetLoaderParameters;
import com.badlogic.gdx.assets.AssetManager;
import com.badlogic.gdx.assets.loaders.AsynchronousAssetLoader;
import com.badlogic.gdx.assets.loaders.FileHandleResolver;
import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.graphics.g2d.TextureAtlas;
import com.badlogic.gdx.utils.Array;
import com.esotericsoftware.spine.SkeletonBinary;
import com.esotericsoftware.spine.SkeletonData;
import com.esotericsoftware.spine.SkeletonJson;
import com.siondream.core.Env;

/** {@link AssetLoader} for {@link SkeletonData} instances. 
 * Loads an exported Spine's skeleton data.
 * The atlas with the images will be loaded as a dependency. This has to be declared as a {@link SkeletonDataLoaderParameter}
 * in the  {@link AssetManager#load(String, Class, AssetLoaderParameters)} call.
 * Supports both binary and JSON skeleton format files. If the animation file name has a 'skel' extension,
 * it will be loaded as binary. Any other extension will be assumed as JSON.
 *
 * Example: suppose you have 'data/spine/character.atlas', 'data/spine/character.png' and 'data/spine/character.skel'.
 * To load it with an asset manager, just do the following:
 * * <pre>
* {@code
* assetManager.setLoader(SkeletonData.class, new SkeletonDataLoader(new InternalFileHandleResolver()));
* SkeletonDataLoaderParameter parameter = new SkeletonDataLoaderParameter("data/spine/character.atlas");
* assetManager.load("data/spine/character.skel", SkeletonData.class, parameter);
* }
* </pre>
 * @author Alvaro Barbeira */
public class SkeletonDataLoader
	extends AsynchronousAssetLoader<SkeletonData,
									SkeletonDataLoader.SkeletonDataLoaderParameter> {

	SkeletonData skeletonData;
	
	public SkeletonDataLoader( FileHandleResolver resolver) {
		super(resolver);
	}

	@Override
	public void loadAsync( AssetManager manager, String fileName, FileHandle file, SkeletonDataLoaderParameter parameter) {
		skeletonData = null;
		TextureAtlas atlas = manager.get(parameter.atlasName, TextureAtlas.class);
		
		String extension = file.extension();
		if (extension.toLowerCase().equals("skel")) {
			SkeletonBinary skeletonBinary = new SkeletonBinary(atlas);
			skeletonBinary.setScale(parameter.scale);
			skeletonData = skeletonBinary.readSkeletonData(file);
		} else {
			SkeletonJson skeletonJson = new SkeletonJson(atlas);
			skeletonJson.setScale(parameter.scale);
			skeletonData = skeletonJson.readSkeletonData(file);			
		}
	}

	@Override
	public SkeletonData loadSync( AssetManager manager, String fileName, FileHandle file, SkeletonDataLoaderParameter parameter) {
		return skeletonData;
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	@Override
	public Array<AssetDescriptor> getDependencies( String fileName, FileHandle file, SkeletonDataLoaderParameter parameter) {
		Array<AssetDescriptor> deps = new Array<AssetDescriptor>();
		deps.add(new AssetDescriptor(parameter.atlasName, TextureAtlas.class));
		return deps;
	}
	
	/** 
	 * Mandatory parameter to be passed to {@link AssetManager#load(String, Class, AssetLoaderParameters)}.
	 * This will insure the skeleton data is loaded correctly
     * @author Alvaro Barbeira */
    static public class SkeletonDataLoaderParameter extends AssetLoaderParameters<SkeletonData> {
    	// A SkeletonJson must be loaded from an atlas.
    	public String atlasName;
    	public float  scale;
    	
    	
    	public SkeletonDataLoaderParameter() {
    		atlasName = "";
    		scale = Env.pixelsToMetres;
    	}
    }
}