cea5ca6af4
2003-06-17 Michael Koch <konqueror@gmx.de> * gnu/java/lang/ArrayHelper.java, gnu/java/lang/ClassHelper.java: Reformatted to match classpath's versions. From-SVN: r68078
186 lines
6.2 KiB
Java
186 lines
6.2 KiB
Java
/* ClassHelper.java -- Utility methods to augment java.lang.Class
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Copyright (C) 1998, 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.lang;
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import java.util.*;
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import java.lang.reflect.*;
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/**
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* ClassHelper has various methods that ought to have been in Class.
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*
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* @author John Keiser
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* @author Eric Blake <ebb9@email.byu.edu>
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*/
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public class ClassHelper
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{
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/**
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* Strip the package part from the class name.
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*
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* @param clazz the class to get the truncated name from
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* @return the truncated class name
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*/
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public static String getTruncatedClassName(Class clazz)
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{
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return getTruncatedName(clazz.getName());
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}
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/**
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* Strip the package part from the class name, or the class part from
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* the method or field name.
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*
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* @param name the name to truncate
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* @return the truncated name
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*/
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public static String getTruncatedName(String name)
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{
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int lastInd = name.lastIndexOf('.');
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if (lastInd == -1)
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return name;
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return name.substring(lastInd + 1);
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}
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/**
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* Strip the last portion of the name (after the last dot).
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*
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* @param name the name to get package of
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* @return the package name, or "" if no package
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*/
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public static String getPackagePortion(String name)
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{
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int lastInd = name.lastIndexOf('.');
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if (lastInd == -1)
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return "";
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return name.substring(0, lastInd);
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}
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/** Cache of methods found in getAllMethods(). */
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private static Map allMethods = new HashMap();
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/**
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* Get all the methods, public, private and otherwise, from the class,
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* getting them from the most recent class to find them. This may not
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* be quite the correct approach, as this includes methods that are not
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* inherited or accessible from clazz, so beware.
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*
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* @param clazz the class to start at
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* @return all methods declared or inherited in clazz
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*/
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public static Method[] getAllMethods(Class clazz)
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{
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Method[] retval = (Method[]) allMethods.get(clazz);
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if (retval == null)
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{
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Set methods = new HashSet();
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Class c = clazz;
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while (c != null)
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{
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Method[] currentMethods = c.getDeclaredMethods();
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loop:
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for (int i = 0; i < currentMethods.length; i++)
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{
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Method current = currentMethods[i];
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int size = methods.size();
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Iterator iter = methods.iterator();
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while (--size >= 0)
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{
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Method override = (Method) iter.next();
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if (current.getName().equals(override.getName())
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&& Arrays.equals(current.getParameterTypes(),
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override.getParameterTypes())
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&& current.getReturnType() == override.getReturnType())
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continue loop;
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}
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methods.add(current);
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}
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c = c.getSuperclass();
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}
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retval = new Method[methods.size()];
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methods.toArray(retval);
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allMethods.put(clazz, retval);
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}
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return retval;
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}
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/** Cache of fields found in getAllFields(). */
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private static Map allFields = new HashMap();
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/**
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* Get all the fields, public, private and otherwise, from the class,
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* getting them from the most recent class to find them. This may not
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* be quite the correct approach, as this includes fields that are not
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* inherited or accessible from clazz, so beware.
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*
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* @param clazz the class to start at
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* @return all fields declared or inherited in clazz
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*/
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public static Field[] getAllFields(Class clazz)
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{
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Field[] retval = (Field[]) allFields.get(clazz);
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if (retval == null)
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{
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Set fields = new HashSet();
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Class c = clazz;
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while (c != null)
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{
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Field[] currentFields = c.getDeclaredFields();
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loop:
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for (int i = 0; i < currentFields.length; i++)
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{
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Field current = currentFields[i];
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int size = fields.size();
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Iterator iter = fields.iterator();
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while (--size >= 0)
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{
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Field override = (Field) iter.next();
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if (current.getName().equals(override.getName())
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&& current.getType() == override.getType())
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continue loop;
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}
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fields.add(current);
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}
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c = c.getSuperclass();
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}
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retval = new Field[fields.size()];
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fields.toArray(retval);
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allFields.put(clazz, retval);
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}
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return retval;
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}
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}
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