org.iworkz.habitat.dao.BlobHelper Maven / Gradle / Ivy

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package org.iworkz.habitat.dao;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.Writer;
import java.sql.Blob;
import java.sql.Clob;

public class BlobHelper {
	
    private static final int BUFFER_SIZE = 4096; 
    
    private BlobHelper() {
    	super();
    }
	
	public static void writeBlobToOutputStream(Blob blob, OutputStream outputStream) throws Exception {
		InputStream inputStream = blob.getBinaryStream();
		try {
			writeInputStreamToOutputStream(inputStream,outputStream);
		} finally {
			inputStream.close();
		}		
	}
	
	   public static void writeClobToOutputStream(Clob clob, OutputStream outputStream) throws Exception {
	        Reader reader = clob.getCharacterStream();
	        PrintWriter writer = new PrintWriter(outputStream);
	        try {
	            writeReaderToWriter(reader,writer);
	        } finally {
	            reader.close();
	            writer.close();
	        }       
	    }
	   
	    public static void writeReaderToWriter(Reader rd, Writer wr) throws Exception {
	        char[] buffer = new char[BUFFER_SIZE];
	        int bytesRead = -1;
	        while ((bytesRead = rd.read(buffer)) != -1) {
	            wr.write(buffer, 0, bytesRead);
	        }
	    }
	
	public static void writeInputStreamToOutputStream(InputStream is, OutputStream outputStream) throws Exception {
		byte[] buffer = new byte[BUFFER_SIZE];
		int bytesRead = -1;
		while ((bytesRead = is.read(buffer)) != -1) {
			outputStream.write(buffer, 0, bytesRead);
		}
	}
	
	public static byte[] getBytesFromInputStream(InputStream inputStream) throws Exception {
	    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
		try {
			writeInputStreamToOutputStream(inputStream,outputStream);
			outputStream.flush();
			return outputStream.toByteArray();
		} finally {
			outputStream.close();
		}
	}

}