com.badlogic.gdx.backends.gwt.preloader.BinaryLoader.java Source code

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Here is the source code for com.badlogic.gdx.backends.gwt.preloader.BinaryLoader.java

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/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * 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 com.badlogic.gdx.backends.gwt.preloader;

import java.io.IOException;
import java.io.InputStream;

import com.google.gwt.xhr.client.ReadyStateChangeHandler;
import com.google.gwt.xhr.client.XMLHttpRequest;

public class BinaryLoader {
    private final LoaderCallback<Blob> callback;

    public BinaryLoader(String url, LoaderCallback<Blob> callback) {
        this.callback = callback;
        XMLHttpRequest request = XMLHttpRequest.create();
        request.setOnReadyStateChange(new ReadyStateChangeHandler() {
            @Override
            public void onReadyStateChange(XMLHttpRequest xhr) {
                if (xhr.getReadyState() == 4) {
                    int status = xhr.getStatus();
                    if (status != 200) {
                        BinaryLoader.this.callback.error();
                    } else {
                        BinaryLoader.this.callback.success(new Blob(xhr.getResponseText()));
                    }
                }
            }
        });
        overrideMimeType(request, "text/plain; charset=x-user-defined");
        request.open("GET", url);
        request.send();
    }

    private native void overrideMimeType(XMLHttpRequest req, String mimeType) /*-{
                                                                              req.overrideMimeType(mimeType);
                                                                              }-*/;

    public static final class Blob {
        final String data;

        public Blob(String data) {
            this.data = data;
        }

        public int length() {
            return data.length();
        }

        public byte get(int i) {
            return get(data, i);
        }

        private native byte get(String s, int i) /*-{
                                                 var x = s.charCodeAt(i) & 0xff;
                                                 if (x > 127) x -= 256;
                                                 return x;
                                                 }-*/;

        public InputStream read() {
            return new BlobInputStream(this);
        }
    }

    private static class BlobInputStream extends InputStream {
        Blob blob;
        int pos;

        public BlobInputStream(Blob blob) {
            this.blob = blob;
        }

        @Override
        public int read() throws IOException {
            if (pos == blob.length())
                return -1;
            return blob.get(pos++) & 0xff;
        }
    }
}