org.hibernate.type.descriptor.java.ByteArrayTypeDescriptor Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
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 java.util.Comparator;
import org.hibernate.HibernateException;
import org.hibernate.engine.jdbc.BinaryStream;
import org.hibernate.engine.jdbc.internal.BinaryStreamImpl;
import org.hibernate.type.descriptor.WrapperOptions;
/**
* Descriptor for {@code Byte[]} handling.
*
* @author Steve Ebersole
*/
public class ByteArrayTypeDescriptor extends AbstractTypeDescriptor {
public static final ByteArrayTypeDescriptor INSTANCE = new ByteArrayTypeDescriptor();
@SuppressWarnings({ "unchecked" })
public ByteArrayTypeDescriptor() {
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;
}
@Override
public String toString(Byte[] bytes) {
final StringBuilder buf = new StringBuilder();
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();
}
@Override
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;
}
@Override
@SuppressWarnings({ "unchecked" })
public Comparator getComparator() {
return IncomparableComparator.INSTANCE;
}
@SuppressWarnings({ "unchecked" })
@Override
public 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 );
}
@Override
public 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() );
}
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] = bytes[i];
}
return result;
}
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];
}
return result;
}
}