MediaPrompt.java

/*******************************************************************************
 * Copyright 2011 The Regents of the University of California
 * 
 * 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 org.ohmage.prompt.media;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;

import org.ohmage.db.Models.Response;
import org.ohmage.prompt.AbstractPrompt;

import java.io.File;
import java.util.UUID;

public abstract class MediaPrompt extends AbstractPrompt {

	private static final String TAG = "MediaPrompt";

	String uuid;

	public MediaPrompt() {
		super();
	}

	/**
	 * Deletes the image from the file system if it was taken
	 */
	public void delete() {
		if(isPromptAnswered()) {
			getMedia().delete();
		}
	}

	@Override
	protected void clearTypeSpecificResponseData() {
		// Delete the old file
		delete();
		uuid = null;
	}

	@Override
	public View inflateView(Context context, ViewGroup parent) {
		return null;
	}

	/**
	 * Returns true if the UUID is not null meaning that we have at least some
	 * image that we are referencing.
	 */
	@Override
	public boolean isPromptAnswered() {
		return(uuid != null);
	}

	@Override
	protected Object getTypeSpecificResponseObject() {
		return uuid;
	}

	@Override
	protected Object getTypeSpecificExtrasObject() {
		return null;
	}

	protected File getMedia() {
	    if(uuid == null)
	        uuid = UUID.randomUUID().toString();
	    return Response.getTemporaryResponsesMedia(uuid);
	}
}