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/* TransformAttribute.java |
/* TransformAttribute.java -- |
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Copyright (C) 2003 Free Software Foundation, Inc. |
Copyright (C) 2003, 2005 Free Software Foundation, Inc. |
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This file is part of GNU Classpath. |
This file is part of GNU Classpath. |
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import java.io.Serializable; |
import java.io.Serializable; |
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/** |
/** |
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* This class provides a mechanism for using an {@link AffineTransform} as |
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* an <i>immutable</i> attribute (for example, in the |
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* {@link java.text.AttributedString} class). Any transform passed to |
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* this class is copied before being stored, and any transform handed out |
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* by this class is a copy of the stored transform. In this way, it is |
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* not possible to modify the stored transform. |
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* |
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* @author Michael Koch |
* @author Michael Koch |
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*/ |
*/ |
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public final class TransformAttribute implements Serializable |
public final class TransformAttribute implements Serializable |
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private AffineTransform affineTransform; |
private AffineTransform affineTransform; |
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/** |
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* Creates a new attribute that contains a copy of the given transform. |
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* |
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* @param transform the transform (<code>null</code> not permitted). |
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* |
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* @throws IllegalArgumentException if <code>transform</code> is |
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* <code>null</code>. |
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*/ |
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public TransformAttribute (AffineTransform transform) |
public TransformAttribute (AffineTransform transform) |
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{ |
{ |
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if (transform != null) |
if (transform == null) |
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{ |
{ |
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this.affineTransform = new AffineTransform (transform); |
throw new IllegalArgumentException("Null 'transform' not permitted."); |
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} |
} |
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this.affineTransform = new AffineTransform (transform); |
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} |
} |
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/** |
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* Returns a copy of the transform contained by this attribute. |
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* |
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* @return A copy of the transform. |
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*/ |
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public AffineTransform getTransform () |
public AffineTransform getTransform () |
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{ |
{ |
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return affineTransform; |
return (AffineTransform) affineTransform.clone(); |
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} |
} |
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/** |
/** |
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* Returns <code>true</code> if the transform contained by this attribute is |
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* an identity transform, and <code>false</code> otherwise. |
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* |
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* @return <code>true</code> if the transform contained by this attribute is |
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* an identity transform, and <code>false</code> otherwise. |
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* |
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* @since 1.4 |
* @since 1.4 |
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*/ |
*/ |
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public boolean isIdentity () |
public boolean isIdentity () |