Hibernate example source code file (CharacterArrayTypeDescriptor.java)

This example Hibernate source code file (CharacterArrayTypeDescriptor.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, character, character, characterarraytypedescriptor, characterarraytypedescriptor, clob, io, jdbc, override, reader, sql, string, string, suppresswarnings, util, wrapperoptions, x, x

The Hibernate CharacterArrayTypeDescriptor.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.Reader;
import java.io.StringReader;
import java.sql.Clob;
import java.sql.SQLException;
import java.util.Arrays;

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

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

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

	public String toString(Character[] value) {
		return new String( unwrapChars( value ) );
	}

	public Character[] fromString(String string) {
		return wrapChars( string.toCharArray() );
	}

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

	@Override
	public int extractHashCode(Character[] chars) {
		int hashCode = 1;
		for ( Character aChar : chars ) {
			hashCode = 31 * hashCode + aChar;
		}
		return hashCode;
	}

	@SuppressWarnings({ "unchecked" })
	public <X> X unwrap(Character[] value, Class type, WrapperOptions options) {
		if ( value == null ) {
			return null;
		}
		if ( Character[].class.isAssignableFrom( type ) ) {
			return (X) value;
		}
		if ( String.class.isAssignableFrom( type ) ) {
			return (X) new String( unwrapChars( value ) );
		}
		if ( Clob.class.isAssignableFrom( type ) ) {
			return (X) options.getLobCreator().createClob( new String( unwrapChars( value ) ) );
		}
		if ( Reader.class.isAssignableFrom( type ) ) {
			return (X) new StringReader( new String( unwrapChars( value ) ) );
		}
		if ( CharacterStream.class.isAssignableFrom( type ) ) {
			return (X) new CharacterStreamImpl( new String( unwrapChars( value ) ) );
		}
		throw unknownUnwrap( type );
	}

	public <X> Character[] wrap(X value, WrapperOptions options) {
		if ( value == null ) {
			return null;
		}
		if ( Character[].class.isInstance( value ) ) {
			return (Character[]) value;
		}
		if ( String.class.isInstance( value ) ) {
			return wrapChars( ( (String) value ).toCharArray() );
		}
		if ( Clob.class.isInstance( value ) ) {
			try {
				return wrapChars( DataHelper.extractString( ( (Clob) value ).getCharacterStream() ).toCharArray() );
			}
			catch ( SQLException e ) {
				throw new HibernateException( "Unable to access lob stream", e );
			}
		}
		if ( Reader.class.isInstance( value ) ) {
			return wrapChars( DataHelper.extractString( (Reader) value ).toCharArray() );
		}
		throw unknownWrap( value.getClass() );
	}

	@SuppressWarnings({ "UnnecessaryBoxing" })
	private Character[] wrapChars(char[] chars) {
		if ( chars == null ) {
			return null;
		}
		final Character[] result = new Character[chars.length];
		for ( int i = 0; i < chars.length; i++ ) {
			result[i] = Character.valueOf( chars[i] );
		}
		return result;
	}

	@SuppressWarnings({ "UnnecessaryUnboxing" })
	private char[] unwrapChars(Character[] chars) {
		if ( chars == null ) {
			return null;
		}
		final char[] result = new char[chars.length];
		for ( int i = 0; i < chars.length; i++ ) {
			result[i] = chars[i].charValue();
		}
		return result;
	}
}