001    /*
002     * Copyright © 2008, 2009 Pedro Agulló Soliveres.
003     * 
004     * This file is part of DirectJNgine.
005     *
006     * DirectJNgine is free software: you can redistribute it and/or modify
007     * it under the terms of the GNU General Public License as published by
008     * the Free Software Foundation, either version 3 of the License.
009     *
010     * Commercial use is permitted to the extent that the code/component(s)
011     * do NOT become part of another Open Source or Commercially developed
012     * licensed development library or toolkit without explicit permission.
013     *
014     * DirectJNgine is distributed in the hope that it will be useful,
015     * but WITHOUT ANY WARRANTY; without even the implied warranty of
016     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017     * GNU General Public License for more details.
018     *
019     * You should have received a copy of the GNU General Public License
020     * along with DirectJNgine.  If not, see <http://www.gnu.org/licenses/>.
021     * 
022     * This software uses the ExtJs library (http://extjs.com), which is 
023     * distributed under the GPL v3 license (see http://extjs.com/license).
024     */
025    
026    package com.softwarementors.extjs.djn;
027    
028    public final class ClassUtils {
029      private ClassUtils() {
030        // Disable class instantiation
031      }
032      
033      public static boolean isNumericType( Class<?> cls ) {
034        assert cls != null;
035      
036        if( cls== float.class || cls == double.class || cls == byte.class || cls == short.class || cls == int.class || cls == long.class) {
037          return true;
038        }
039        
040        Class<?> currentClass = cls;
041        while( currentClass != null ) {
042          if( currentClass == Number.class )
043            return true;
044          currentClass = currentClass.getSuperclass();        
045        }
046        return false;
047      }
048    
049      // JDK 1.4 does not implement Class.getSimpleName()
050      public static String getSimpleName( Class<?> cls ) {
051        assert cls != null;
052        
053        String result = cls.getName();
054        
055        // Special case: inner classes!
056        int simpleNameStart = result.lastIndexOf("$");
057        if( simpleNameStart >= 0 ) {
058          simpleNameStart++; // Skip the "$"
059          // Need to skip the digits immediately after the "$"
060          for( ; simpleNameStart < result.length(); simpleNameStart++ ) {
061            if( !Character.isDigit(result.charAt(simpleNameStart)) ) {
062              return result.substring(simpleNameStart);
063            }
064          }
065        }
066        else {
067          simpleNameStart = result.lastIndexOf( ".");
068          if( simpleNameStart >= 0) {
069            return result.substring(simpleNameStart+1);
070          }
071        }
072        return result;
073      }
074    
075      // Note: would be nice to make recursive, so that we can handle array of array of array of ...,
076      //       but in reality pretty-printing just one-dimensional arrays is ok
077      public static String getNicePrintableName( Class<?> cls ) {
078        assert cls != null;
079        
080        Class<?> type = cls;
081        if( cls.isArray() ) {
082          type = cls.getComponentType();
083        }
084        
085        String typeName = type.getName();
086        if( typeName.startsWith( "java.lang") ) {
087          typeName = getSimpleName(type);
088        }
089        
090        if( cls.isArray() ) {
091          typeName += "[]";
092        }
093        return typeName;
094      }
095    }