DownloadTask.java

package com.droidworks.http.download;

import java.io.InputStream;
import java.util.ArrayList;

public abstract class DownloadTask<T> {

	public static int STATUS_UNPROCESSED = -1;
	public static int STATUS_OK = 0;
	public static int STATUS_TIMED_OUT = 1;
	public static int STATUS_NO_STORAGE = 2;
	public static int STATUS_FILE_WRITE_ERROR = 3;
	public static int STATUS_CANCELLED = 4;
	public static int STATUS_GENERAL_ERROR = 5;

	private final String mUrl;
	private int mTimeOut = 10;  // default to a 10 second connection timeout

	private int mStatus = -1;

	private final ArrayList<DownloadCompletedListener<T>> mListeners
		= new ArrayList<DownloadCompletedListener<T>>();

	@Deprecated
	public void setTimeout(int seconds) {
		mTimeOut = seconds;
	}

	@Deprecated
	public int getTimeout() {
		return mTimeOut;
	}

	public DownloadTask(String url) {
		mUrl = url;
	}

	public void addListener(DownloadCompletedListener<T> listener) {
		mListeners.add(listener);
	}

	public String getUrl() {
		return mUrl;
	}

	public ArrayList<DownloadCompletedListener<T>> getListeners() {
		return mListeners;
	}

	public interface DownloadCompletedListener<T> {
		public void onDownloadComplete(T output, int resultCode);
	}

	public void notifyListeners() {
		for (DownloadCompletedListener<T> l : getListeners()) {
			l.onDownloadComplete(getOutput(), getStatus());
		}
	}

	@Override
	public boolean equals(Object obj) {
		if (!(obj instanceof DownloadTask<?>))
				return false;

		if (((DownloadTask<?>) obj).getUrl().equals(mUrl))
			return true;

		return false;
	}

	abstract public void processStream(InputStream stream);

	abstract public T getOutput();

	public int getStatus() {
		return mStatus;
	}

	public void setStatus(int status) {
		mStatus = status;
	}

}