/*
 * 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.math.BigDecimal;
import java.math.BigInteger;

import org.hibernate.type.descriptor.WrapperOptions;

/**
 * Descriptor for {@link BigInteger} handling.
 *
 * @author Steve Ebersole
 */
public class BigIntegerTypeDescriptor extends AbstractTypeDescriptor<BigInteger> {
	public static final BigIntegerTypeDescriptor INSTANCE = new BigIntegerTypeDescriptor();

	public BigIntegerTypeDescriptor() {
		super( BigInteger.class );
	}

	public String toString(BigInteger value) {
		return value.toString();
	}

	public BigInteger fromString(String string) {
		return new BigInteger( string );
	}

	@Override
	public int extractHashCode(BigInteger value) {
		return value.intValue();
	}

	@Override
	public boolean areEqual(BigInteger one, BigInteger another) {
		return one == another || ( one != null && another != null && one.compareTo( another ) == 0 );
	}

	/**
	 * {@inheritDoc}
	 */
	@SuppressWarnings({ "unchecked" })
	public <X> X unwrap(BigInteger value, Class<X> type, WrapperOptions options) {
		if ( value == null ) {
			return null;
		}
		if ( BigInteger.class.isAssignableFrom( type ) ) {
			return (X) value;
		}
		if ( BigDecimal.class.isAssignableFrom( type ) ) {
			return (X) new BigDecimal( value );
		}
		if ( Byte.class.isAssignableFrom( type ) ) {
			return (X) Byte.valueOf( value.byteValue() );
		}
		if ( Short.class.isAssignableFrom( type ) ) {
			return (X) Short.valueOf( value.shortValue() );
		}
		if ( Integer.class.isAssignableFrom( type ) ) {
			return (X) Integer.valueOf( value.intValue() );
		}
		if ( Long.class.isAssignableFrom( type ) ) {
			return (X) Long.valueOf( value.longValue() );
		}
		if ( Double.class.isAssignableFrom( type ) ) {
			return (X) Double.valueOf( value.doubleValue() );
		}
		if ( Float.class.isAssignableFrom( type ) ) {
			return (X) Float.valueOf( value.floatValue() );
		}
		throw unknownUnwrap( type );
	}

	/**
	 * {@inheritDoc}
	 */
	public <X> BigInteger wrap(X value, WrapperOptions options) {
		if ( value == null ) {
			return null;
		}
		if ( BigInteger.class.isInstance( value ) ) {
			return (BigInteger) value;
		}
		if ( BigDecimal.class.isInstance( value ) ) {
			return ( (BigDecimal) value ).toBigIntegerExact();
		}
		if ( Number.class.isInstance( value ) ) {
			return BigInteger.valueOf( ( (Number) value ).longValue() );
		}
		throw unknownWrap( value.getClass() );
	}
}