AWT/Swing merge from GNU Classpath.

From-SVN: r56147

1 files changed, 98 insertions, 0 deletions

diff --git a/libjava/java/awt/AttributeValue.java b/libjava/java/awt/AttributeValue.java
new file mode 100644
index 0000000..f692c012
--- /dev/null
+++ b/libjava/java/awt/AttributeValue.java
@@ -0,0 +1,98 @@
+/* AttributeValue.java -- parent of type-safe enums of attributes
+   Copyright (C) 2002 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., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 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;
+
+/**
+ * This class is undocumented by Sun, but it is the parent of several other
+ * classes, all of which are type-safe enumerations. This takes care of
+ * <code>equals</code>, <code>toString</code>, and <code>hashCode</code>, so
+ * that you don't have to (although hashCode is commonly overridden).
+ *
+ * @author Eric Blake <ebb9@email.byu.edu>
+ */
+class AttributeValue
+{
+  /** The value of the enumeration. Package visible for speed. */
+  final int value;
+
+  /** The list of enumeration names for the given subclass. */
+  private final String[] names;
+
+  /**
+   * Construct a type-safe enumeration element. For example,<br>
+   * <pre>
+   * class Foo extends AttributeValue
+   * {
+   *   private static final String[] names = { "one", "two" }
+   *   public static final Foo ONE = new Foo(0);
+   *   public static final Foo TWO = new Foo(1);
+   *   private Foo(int value) { super(value, names); }
+   * }
+   * </pre>
+   *
+   * @param value the position of this enumeration element, consecutive from 0
+   * @param names the constant list of enumeration names for the subclass
+   */
+  AttributeValue(int value, String[] names)
+  {
+    this.value = value;
+    this.names = names;
+  }
+
+  /**
+   * Returns the hashcode of this element. This is the index of the element
+   * in the enumeration. Note that equals defaults to the == relation.
+   *
+   * @return the hashcode
+   */
+  public int hashCode()
+  {
+    return value;
+  }
+
+  /**
+   * Returns the name of this enumeration element.
+   *
+   * @return the element name
+   */
+  public String toString()
+  {
+    return names[value];
+  }
+} // class AttributeValue