GosuClassUtil.java

/*
 * Copyright 2013 Guidewire Software, Inc.
 */

package gw.util;

import java.io.File;
import java.util.Set;
import java.util.HashSet;

/**
 * This class is in part derived from org.apache.commons.lang.ClassUtils and is intended
 * to break a dependency on that project.
 */
public class GosuClassUtil
{
  public static String getNameNoPackage( String className )
  {
    if( className == null )
    {
      return null;
    }
    int packageIndex = className.lastIndexOf( '.' ) + 1;
    int innerClassIndex = className.lastIndexOf( '$' ) + 1;
    int index = packageIndex >= innerClassIndex ?
                packageIndex : innerClassIndex;
    return className.substring( index );
  }

  /**
   */
  public static String getPackage( String className )
  {
    if( className == null || !className.contains(".") )
    {
      return "";
    }
    int packageIndex = className.lastIndexOf( '.' );
    if (packageIndex < 0) {
      return "";
    }
    return className.substring( 0, packageIndex );
  }

  public static String getFileExtension( String name )
  {
    int iIndex = name.lastIndexOf( '.' );
    if( iIndex >= 0 )
    {
      return name.substring( iIndex );
    }
    return null;
  }

  public static String getFileExtension( File file )
  {
    String name = file.getName();
    return getFileExtension( name );
  }

  /**
   * <p>Gets the class name minus the package name from a <code>Class</code>.</p>
   *
   * @param cls the class to get the short name for.
   *
   * @return the class name without the package name or an empty string
   */
  public static String getShortClassName( Class cls )
  {
    if( cls == null )
    {
      return "";
    }
    return getShortClassName( cls.getName() );
  }

  /**
   * <p>Gets the class name minus the package name from a String.</p>
   * <p/>
   * <p>The string passed in is assumed to be a class name - it is not checked.</p>
   *
   * @param className the className to get the short name for
   *
   * @return the class name of the class without the package name or an empty string
   */
  public static String getShortClassName( String className )
  {
    if( className == null )
    {
      return "";
    }
    if( className.length() == 0 )
    {
      return "";
    }

    int lastDotIdx = className.lastIndexOf( "." );
    int innerIdx = className.indexOf(
      "$", lastDotIdx == -1 ? 0 : lastDotIdx + 1 );
    String out = className.substring( lastDotIdx + 1 );
    if( innerIdx != -1 )
    {
      out = out.replace( "$", "." );
    }
    return out;
  }

  public static Set<Class> getAllInterfaces( Class c )
  {
    return getAllInterfacesImpl( c, new HashSet<Class>() );
  }

  private static Set<Class> getAllInterfacesImpl( Class c, HashSet<Class> hashSet )
  {
    if( c == null || hashSet.contains( c ) )
    {
      return hashSet;
    }
    else
    {
      if( c.isInterface() )
      {
        hashSet.add( c );
      }
      getAllInterfacesImpl( c.getSuperclass(), hashSet );
      for( Class iface : c.getInterfaces() )
      {
        getAllInterfacesImpl( iface, hashSet );
      }
    }
    return hashSet;
  }
}