Subversion Repositories openrisc

/* TransformAttribute.java --

   Copyright (C) 2003, 2005  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package java.awt.font;

import java.awt.geom.AffineTransform;

import java.io.Serializable;

/**

 * This class provides a mechanism for using an {@link AffineTransform} as

 * an <i>immutable</i> attribute (for example, in the

 * {@link java.text.AttributedString} class).  Any transform passed to

 * this class is copied before being stored, and any transform handed out

 * by this class is a copy of the stored transform.  In this way, it is

 * not possible to modify the stored transform.

 *

 * @author Michael Koch

 */

public final class TransformAttribute implements Serializable

{

  private static final long serialVersionUID = 3356247357827709530L;

  private AffineTransform affineTransform;

  /**

   * Creates a new attribute that contains a copy of the given transform.

   *

   * @param transform  the transform (<code>null</code> not permitted).

   *

   * @throws IllegalArgumentException if <code>transform</code> is

   *         <code>null</code>.

   */

  public TransformAttribute (AffineTransform transform)

  {

    if (transform == null)

      {

        throw new IllegalArgumentException("Null 'transform' not permitted.");

      }

    this.affineTransform = new AffineTransform (transform);

  }

  /**

   * Returns a copy of the transform contained by this attribute.

   *

   * @return A copy of the transform.

   */

  public AffineTransform getTransform ()

  {

    return (AffineTransform) affineTransform.clone();

  }

  /**

   * Returns <code>true</code> if the transform contained by this attribute is

   * an identity transform, and <code>false</code> otherwise.

   *

   * @return <code>true</code> if the transform contained by this attribute is

   * an identity transform, and <code>false</code> otherwise.

   *

   * @since 1.4

   */

  public boolean isIdentity ()

  {

    return (affineTransform == null ? false : affineTransform.isIdentity ());

  }

}