Hibernate example source code file (PrimitiveByteArrayTypeDescriptor.java)

This example Hibernate source code file (PrimitiveByteArrayTypeDescriptor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

abstracttypedescriptor, bytearrayinputstream, illegalargumentexception, io, jdbc, override, primitivebytearraytypedescriptor, primitivebytearraytypedescriptor, sql, string, string, stringbuffer, suppresswarnings, util, wrapperoptions, wrapperoptions, x, x

The Hibernate PrimitiveByteArrayTypeDescriptor.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.type.descriptor.java;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.sql.Blob;
import java.sql.SQLException;
import java.util.Arrays;

import org.hibernate.HibernateException;
import org.hibernate.type.descriptor.BinaryStream;
import org.hibernate.type.descriptor.WrapperOptions;

/**
 * Descriptor for {@code byte[]} handling.
 *
 * @author Steve Ebersole
 */
public class PrimitiveByteArrayTypeDescriptor extends AbstractTypeDescriptor<byte[]> {
	public static final PrimitiveByteArrayTypeDescriptor INSTANCE = new PrimitiveByteArrayTypeDescriptor();

	@SuppressWarnings({ "unchecked" })
	public PrimitiveByteArrayTypeDescriptor() {
		super( byte[].class, ArrayMutabilityPlan.INSTANCE );
	}

	@Override
	public boolean areEqual(byte[] one, byte[] another) {
		return one == another 
				|| ( one != null && another != null && Arrays.equals( one, another ) );
	}

	@Override
	public int extractHashCode(byte[] bytes) {
		int hashCode = 1;
		for ( byte aByte : bytes ) {
			hashCode = 31 * hashCode + aByte;
		}
		return hashCode;
	}

	public String toString(byte[] bytes) {
		final StringBuffer buf = new StringBuffer();
		for ( byte aByte : bytes ) {
			final String hexStr = Integer.toHexString( aByte - Byte.MIN_VALUE );
			if ( hexStr.length() == 1 ) {
				buf.append( '0' );
			}
			buf.append( hexStr );
		}
		return buf.toString();
	}

	public byte[] fromString(String string) {
		if ( string == null ) {
			return null;
		}
		if ( string.length() % 2 != 0 ) {
			throw new IllegalArgumentException( "The string is not a valid string representation of a binary content." );
		}
		byte[] bytes = new byte[string.length() / 2];
		for ( int i = 0; i < bytes.length; i++ ) {
			final String hexStr = string.substring( i * 2, (i + 1) * 2 );
			bytes[i] = (byte) (Integer.parseInt(hexStr, 16) + Byte.MIN_VALUE);
		}
		return bytes;
	}

	@SuppressWarnings({ "unchecked" })
	public <X> X unwrap(byte[] value, Class type, WrapperOptions options) {
		if ( value == null ) {
			return null;
		}
		if ( byte[].class.isAssignableFrom( type ) ) {
			return (X) value;
		}
		if ( InputStream.class.isAssignableFrom( type ) ) {
			return (X) new ByteArrayInputStream( value );
		}
		if ( BinaryStream.class.isAssignableFrom( type ) ) {
			return (X) new BinaryStreamImpl( value );
		}
		if ( Blob.class.isAssignableFrom( type ) ) {
			return (X) options.getLobCreator().createBlob( value );
		}

		throw unknownUnwrap( type );
	}

	public <X> byte[] wrap(X value, WrapperOptions options) {
		if ( value == null ) {
			return null;
		}
		if ( byte[].class.isInstance( value ) ) {
			return (byte[]) value;
		}
		if ( InputStream.class.isInstance( value ) ) {
			return DataHelper.extractBytes( (InputStream) value );
		}
		if ( Blob.class.isInstance( value ) || DataHelper.isNClob( value.getClass() ) ) {
			try {
				return DataHelper.extractBytes( ( (Blob) value ).getBinaryStream() );
			}
			catch ( SQLException e ) {
				throw new HibernateException( "Unable to access lob stream", e );
			}
		}

		throw unknownWrap( value.getClass() );
	}
}