Initial revision

From-SVN: r102074

libjava/classpath/gnu/java/lang/ClassHelper.java

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+/* ClassHelper.java -- Utility methods to augment java.lang.Class
+   Copyright (C) 1998, 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., 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 gnu.java.lang;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * ClassHelper has various methods that ought to have been in Class.
+ *
+ * @author John Keiser
+ * @author Eric Blake (ebb9@email.byu.edu)
+ */
+public class ClassHelper
+{
+  /**
+   * Strip the package part from the class name.
+   *
+   * @param clazz the class to get the truncated name from
+   * @return the truncated class name
+   */
+  public static String getTruncatedClassName(Class clazz)
+  {
+    return getTruncatedName(clazz.getName());
+  }
+
+  /**
+   * Strip the package part from the class name, or the class part from
+   * the method or field name.
+   *
+   * @param name the name to truncate
+   * @return the truncated name
+   */
+  public static String getTruncatedName(String name)
+  {
+    int lastInd = name.lastIndexOf('.');
+    if (lastInd == -1)
+      return name;
+    return name.substring(lastInd + 1);
+  }
+
+  /** Cache of methods found in getAllMethods(). */
+  private static Map allMethods = new HashMap();
+
+  /**
+   * Get all the methods, public, private and otherwise, from the class,
+   * getting them from the most recent class to find them. This may not
+   * be quite the correct approach, as this includes methods that are not
+   * inherited or accessible from clazz, so beware.
+   *
+   * @param clazz the class to start at
+   * @return all methods declared or inherited in clazz
+   */
+  public static Method[] getAllMethods(Class clazz)
+  {
+    Method[] retval = (Method[]) allMethods.get(clazz);
+    if (retval == null)
+      {
+        Set methods = new HashSet();
+        Class c = clazz;
+        while (c != null)
+          {
+            Method[] currentMethods = c.getDeclaredMethods();
+          loop:
+            for (int i = 0; i < currentMethods.length; i++)
+              {
+                Method current = currentMethods[i];
+                int size = methods.size();
+                Iterator iter = methods.iterator();
+                while (--size >= 0)
+                  {
+                    Method override = (Method) iter.next();
+                    if (current.getName().equals(override.getName())
+                        && Arrays.equals(current.getParameterTypes(),
+                                         override.getParameterTypes())
+                        && current.getReturnType() == override.getReturnType())
+                      continue loop;
+                  }
+                methods.add(current);
+              }
+            c = c.getSuperclass();
+          }
+        retval = new Method[methods.size()];
+        methods.toArray(retval);
+        allMethods.put(clazz, retval);
+      }
+    return retval;
+  }
+
+  /** Cache of fields found in getAllFields(). */
+  private static Map allFields = new HashMap();
+
+  /**
+   * Get all the fields, public, private and otherwise, from the class,
+   * getting them from the most recent class to find them. This may not
+   * be quite the correct approach, as this includes fields that are not
+   * inherited or accessible from clazz, so beware.
+   *
+   * @param clazz the class to start at
+   * @return all fields declared or inherited in clazz
+   */
+  public static Field[] getAllFields(Class clazz)
+  {
+    Field[] retval = (Field[]) allFields.get(clazz);
+    if (retval == null)
+      {
+        Set fields = new HashSet();
+        Class c = clazz;
+        while (c != null)
+          {
+            Field[] currentFields = c.getDeclaredFields();
+          loop:
+            for (int i = 0; i < currentFields.length; i++)
+              {
+                Field current = currentFields[i];
+                int size = fields.size();
+                Iterator iter = fields.iterator();
+                while (--size >= 0)
+                  {
+                    Field override = (Field) iter.next();
+                    if (current.getName().equals(override.getName())
+                        && current.getType() == override.getType())
+                      continue loop;
+                  }
+                fields.add(current);
+              }
+            c = c.getSuperclass();
+          }
+        retval = new Field[fields.size()];
+        fields.toArray(retval);
+        allFields.put(clazz, retval);
+      }
+    return retval;
+  }
+}