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Hibernate example source code file (ByteArrayTypeDescriptor.java)

This example Hibernate source code file (ByteArrayTypeDescriptor.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, byte, byte, bytearraytypedescriptor, bytearraytypedescriptor, io, jdbc, sql, string, stringbuffer, suppresswarnings, suppresswarnings, unnecessaryboxing, unnecessaryunboxing, wrapperoptions, x, x

The Hibernate ByteArrayTypeDescriptor.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 org.hibernate.HibernateException;
import org.hibernate.type.descriptor.BinaryStream;
import org.hibernate.type.descriptor.WrapperOptions;

/**
 * TODO : javadoc
 *
 * @author Steve Ebersole
 */
public class ByteArrayTypeDescriptor extends AbstractTypeDescriptor<Byte[]> {
	public static final ByteArrayTypeDescriptor INSTANCE = new ByteArrayTypeDescriptor();

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

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

	@SuppressWarnings({ "UnnecessaryBoxing" })
	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.valueOf( (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 ( byte[].class.isAssignableFrom( type ) ) {
			return (X) unwrapBytes( value );
		}
		if ( InputStream.class.isAssignableFrom( type ) ) {
			return (X) new ByteArrayInputStream( unwrapBytes( value ) );
		}
		if ( BinaryStream.class.isAssignableFrom( type ) ) {
			return (X) new BinaryStreamImpl( unwrapBytes( value ) );
		}
		if ( Blob.class.isAssignableFrom( type ) ) {
			return (X) options.getLobCreator().createBlob( unwrapBytes( 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 ( byte[].class.isInstance( value ) ) {
			return wrapBytes( (byte[]) value );
		}
		if ( InputStream.class.isInstance( value ) ) {
			return wrapBytes( DataHelper.extractBytes( (InputStream) value ) );
		}
		if ( Blob.class.isInstance( value ) || DataHelper.isNClob( value.getClass() ) ) {
			try {
				return wrapBytes( DataHelper.extractBytes( ( (Blob) value ).getBinaryStream() ) );
			}
			catch ( SQLException e ) {
				throw new HibernateException( "Unable to access lob stream", e );
			}
		}

		throw unknownWrap( value.getClass() );
	}

	@SuppressWarnings({ "UnnecessaryBoxing" })
	private Byte[] wrapBytes(byte[] bytes) {
		if ( bytes == null ) {
			return null;
		}
		final Byte[] result = new Byte[bytes.length];
		for ( int i = 0; i < bytes.length; i++ ) {
			result[i] = Byte.valueOf( bytes[i] );
		}
		return result;
	}

	@SuppressWarnings({ "UnnecessaryUnboxing" })
	private byte[] unwrapBytes(Byte[] bytes) {
		if ( bytes == null ) {
			return null;
		}
		final byte[] result = new byte[bytes.length];
		for ( int i = 0; i < bytes.length; i++ ) {
			result[i] = bytes[i].byteValue();
		}
		return result;
	}
}

Other Hibernate examples (source code examples)

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