Strings.java

/**
 *   GRANITE DATA SERVICES
 *   Copyright (C) 2006-2015 GRANITE DATA SERVICES S.A.S.
 *
 *   This file is part of the Granite Data Services Platform.
 *
 *   Granite Data Services is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 *
 *   Granite Data Services 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 Lesser
 *   General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 *   USA, or see <http://www.gnu.org/licenses/>.
 */
/*
 * JBoss, Home of Professional Open Source
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 */

package org.granite.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.StringTokenizer;

/**
 * @author <a href="mailto:theute@jboss.org">Thomas Heute</a>
 */
public class Strings
{
   
   public static String unqualify(String name)
   {
      return unqualify(name, '.');
   }
   
   public static String unqualify(String name, char sep)
   {
      return name.substring( name.lastIndexOf(sep)+1, name.length() );
   }
   
   public static boolean isEmpty(String string)
   {
      return string == null || string.trim().length() == 0; 
   }
   
   public static String nullIfEmpty(String string)
   {
      return isEmpty(string) ? null : string;
   }

   public static String toString(Object component)
   {
      try {
         PropertyDescriptor[] props = Introspector.getPropertyDescriptors(component.getClass());
         StringBuilder builder = new StringBuilder();
         for (PropertyDescriptor descriptor : props)
         {
            builder.append( descriptor.getName() )
               .append("=")
               .append( descriptor.getReadMethod().invoke(component) )
               .append("; ");
         }
         return builder.toString();
      }
      catch (Exception e) {
         return "";
      }
   }

   public static String[] split(String strings, String delims)
   {
      if (strings==null)
      {
         return new String[0];
      }
      
      StringTokenizer tokens = new StringTokenizer(strings, delims);
      String[] result = new String[ tokens.countTokens() ];
      int i=0;
      while ( tokens.hasMoreTokens() )
      {
         result[i++] = tokens.nextToken();
      }
      return result;
   }
   
   public static String toString(Object... objects)
   {
      return toString(" ", objects);
   }
   
   public static String toString(String sep, Object... objects)
   {
      if (objects.length==0) return "";
      StringBuilder builder = new StringBuilder();
      for (Object object: objects)
      {
         builder.append(sep).append(object);
      }
      return builder.substring(2);
   }
   
   public static String toClassNameString(String sep, Object... objects)
   {
      if (objects.length==0) return "";
      StringBuilder builder = new StringBuilder();
      for (Object object: objects)
      {
         builder.append(sep);
         if (object==null)
         {
            builder.append("null");
         }
         else
         {
            builder.append( object.getClass().getName() );
         }
      }
      return builder.substring(2);
   }
   
   public static String toString(String sep, Class<?>... classes)
   {
      if (classes.length==0) return "";
      StringBuilder builder = new StringBuilder();
      for (Class<?> clazz: classes)
      {
         builder.append(sep).append( clazz.getName() );
      }
      return builder.substring(2);
   }
   
   public static String toString(InputStream in) throws IOException {
      StringBuffer out = new StringBuffer();
      byte[] b = new byte[4096];
      for ( int n; (n = in.read(b)) != -1; ) 
      {
         out.append(new String(b, 0, n));
      }
      return out.toString();
  }

}