AbstractGenerator.java

/**
 * Copyright (C) 2007 - 2016 52°North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * 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.n52.wps.io.datahandler.generator;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.codec.binary.Base64InputStream;
import org.n52.wps.FormatDocument.Format;
import org.n52.wps.commons.WPSConfig;
import org.n52.wps.io.AbstractIOHandler;
import org.n52.wps.io.IGenerator;
import org.n52.wps.io.IOHandler;
import org.n52.wps.io.data.IData;

/**
 * @author Matthias Mueller, TU Dresden
 *
 */
public abstract class AbstractGenerator extends AbstractIOHandler implements IGenerator {
	
	/**
	 * A list of files that shall be deleted by destructor.
	 * Convenience mechanism to delete temporary files that had
	 * to be written during the generation procedure.
	 */
	protected List<File> finalizeFiles;
	
	public AbstractGenerator(){
		super();
		
		this.properties = WPSConfig.getInstance().getPropertiesForGeneratorClass(this.getClass().getName());
		
		this.formats = WPSConfig.getInstance().getFormatsForGeneratorClass(this.getClass().getName());
				
		for (Format format : formats) {			

			if(format.getMimetype()!= null && !format.getMimetype().equals("")){
				String mimetype = format.getMimetype();
				supportedFormats.add(mimetype);
			}
			if(format.getSchema()!= null && !format.getSchema().equals("")){
				String schema = format.getSchema();
				supportedSchemas.add(schema);				
			}
			
			if(format.getEncoding()!= null && !format.getEncoding().equals("")){
				String encoding = format.getEncoding();
				supportedEncodings.add(encoding);
			}else{
				supportedEncodings.add(IOHandler.DEFAULT_ENCODING);
			}			
		}
		
		finalizeFiles = new ArrayList<File>();
	}
	
	public InputStream generateBase64Stream(IData data, String mimeType, String schema) throws IOException {
		return new Base64InputStream(generateStream(data, mimeType, schema), true);
	}
	
	/**
	 * Destructor deletes generated temporary files.
	 */
	@Override
	protected void finalize() throws Throwable {
		
		for (File currentFile : finalizeFiles){
			currentFile.delete();
		}
		
		super.finalize();
	}

}