BlobUtils.java

/*
 * Copyright 2005 The Apache Software Foundation.
 *
 * 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 net.sf.beanlib.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Blob;
import java.sql.SQLException;

import net.sf.beanlib.BeanlibException;

import org.apache.commons.lang.ArrayUtils;
import org.apache.log4j.Logger;

/**
 * Blob Utilities.
 * 
 * @author Joe D. Velopar
 */
public class BlobUtils {
    private Logger log = Logger.getLogger(this.getClass());

    public byte[] toByteArray(Blob fromBlob) {
        return toByteArray(fromBlob, 4000);
    }

    public byte[] toByteArray(Blob fromBlob, int bufferSize) {
        if (fromBlob == null)
            return ArrayUtils.EMPTY_BYTE_ARRAY;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try {
            return toByteArrayImpl(fromBlob, baos, bufferSize);
        } catch (SQLException e) {
            log.error("", e);
            throw new BeanlibException(e);
        } catch (IOException e) {
            log.error("", e);
            throw new BeanlibException(e);
        } finally {
            if (baos != null) {
                try {
                    baos.close();
                } catch (IOException ex) {
                    log.warn("", ex);
                }
            }
        }
    }

    private byte[] toByteArrayImpl(Blob fromBlob, ByteArrayOutputStream baos, int bufferSize) throws SQLException, IOException {
        byte[] buf = new byte[bufferSize];
        InputStream is = fromBlob.getBinaryStream();
        try {
            for (;;) {
                int dataSize = is.read(buf);

                if (dataSize == -1)
                    break;
                baos.write(buf, 0, dataSize);
            }
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException ex) {
                    log.warn("", ex);
                }
            }
        }
        return baos.toByteArray();
    }
}