NetworkDeniedImageDownloader.java

/*******************************************************************************
 * Copyright 2011-2013 Sergey Tarasevich
 *
 * 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.nostra13.universalimageloader.core.download;

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

/**
 * Decorator. Prevents downloads from network (throws {@link IllegalStateException exception}).<br />
 * In most cases this downloader shouldn't be used directly.
 * 
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.8.0
 */
public class NetworkDeniedImageDownloader implements ImageDownloader {

	private final ImageDownloader wrappedDownloader;

	public NetworkDeniedImageDownloader(ImageDownloader wrappedDownloader) {
		this.wrappedDownloader = wrappedDownloader;
	}

	@Override
	public InputStream getStream(String imageUri, Object extra) throws IOException {
		switch (Scheme.ofUri(imageUri)) {
			case HTTP:
			case HTTPS:
				throw new IllegalStateException();
			default:
				return wrappedDownloader.getStream(imageUri, extra);
		}
	}
}