Clover coverage report - Drools - 2.0-rc2
Coverage timestamp: Wed May 11 2005 07:12:26 BST
file stats: LOC: 145   Methods: 3
NCLOC: 85   Classes: 1
 
 Source file Conditionals Statements Methods TOTAL
ReflectiveVisitor.java 0% 0% 0% 0%
coverage
 1    package org.drools.reteoo;
 2   
 3    /*
 4    * $Id: ReflectiveVisitor.java,v 1.5.2.1 2005/04/17 13:15:16 mproctor Exp $
 5    *
 6    * Copyright 2004-2004 (C) The Werken Company. All Rights Reserved.
 7    *
 8    * Redistribution and use of this software and associated documentation
 9    * ("Software"), with or without modification, are permitted provided that the
 10    * following conditions are met:
 11    *
 12    * 1. Redistributions of source code must retain copyright statements and
 13    * notices. Redistributions must also contain a copy of this document.
 14    *
 15    * 2. Redistributions in binary form must reproduce the above copyright notice,
 16    * this list of conditions and the following disclaimer in the documentation
 17    * and/or other materials provided with the distribution.
 18    *
 19    * 3. The name "drools" must not be used to endorse or promote products derived
 20    * from this Software without prior written permission of The Werken Company.
 21    * For written permission, please contact bob@werken.com.
 22    *
 23    * 4. Products derived from this Software may not be called "drools" nor may
 24    * "drools" appear in their names without prior written permission of The Werken
 25    * Company. "drools" is a trademark of The Werken Company.
 26    *
 27    * 5. Due credit should be given to The Werken Company. (http://werken.com/)
 28    *
 29    * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS''
 30    * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 31    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 32    * ARE DISCLAIMED. IN NO EVENT SHALL THE WERKEN COMPANY OR ITS CONTRIBUTORS BE
 33    * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 34    * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 35    * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 36    * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 37    * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 38    * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 39    * POSSIBILITY OF SUCH DAMAGE.
 40    *
 41    */
 42   
 43    import java.lang.reflect.Method;
 44   
 45    import org.drools.Visitor;
 46   
 47    /**
 48    * Java Tip 98: Reflect on the Visitor design pattern. Implement visitors in
 49    * Java, using reflection.
 50    * http://www.javaworld.com/javaworld/javatips/jw-javatip98.html
 51    *
 52    * @author Jeremy Blosser
 53    */
 54    public abstract class ReflectiveVisitor
 55    implements
 56    Visitor
 57    {
 58    static final String newline = System.getProperty( "line.separator" );
 59   
 60  0 public void visit(Object object)
 61    {
 62  0 try
 63    {
 64  0 if ( object != null )
 65    {
 66  0 Method method = getMethod( object.getClass( ) );
 67  0 method.invoke( this,
 68    new Object[]{object} );
 69    }
 70    else
 71    {
 72  0 Method method = getClass( ).getMethod( "visitNull",
 73    ( Class[] ) null );
 74  0 method.invoke( this,
 75    ( Object[] ) null );
 76    }
 77    }
 78    catch ( Exception e )
 79    {
 80  0 e.printStackTrace( );
 81    }
 82    }
 83   
 84  0 private Method getMethod(Class clazz)
 85    {
 86  0 Class newClazz = clazz;
 87  0 Method method = null;
 88   
 89    // Try the superclasses
 90  0 while ( method == null && newClazz != Object.class )
 91    {
 92  0 String methodName = newClazz.getName( );
 93  0 methodName = "visit" + methodName.substring( methodName.lastIndexOf( '.' ) + 1 );
 94  0 try
 95    {
 96  0 method = getClass( ).getMethod( methodName,
 97    new Class[]{newClazz} );
 98    }
 99    catch ( NoSuchMethodException e )
 100    {
 101  0 newClazz = newClazz.getSuperclass( );
 102    }
 103    }
 104   
 105    // Try the interfaces.
 106  0 if ( newClazz == Object.class )
 107    {
 108  0 Class[] interfaces = clazz.getInterfaces( );
 109  0 for ( int i = 0; i < interfaces.length; i++ )
 110    {
 111  0 String methodName = interfaces[i].getName( );
 112  0 methodName = "visit" + methodName.substring( methodName.lastIndexOf( '.' ) + 1 );
 113  0 try
 114    {
 115  0 method = getClass( ).getMethod( methodName,
 116    new Class[]{interfaces[i]} );
 117    }
 118    catch ( NoSuchMethodException e )
 119    {
 120    // swallow
 121    }
 122    }
 123    }
 124  0 if ( method == null )
 125    {
 126  0 try
 127    {
 128  0 method = getClass( ).getMethod( "visitObject",
 129    new Class[]{Object.class} );
 130    }
 131    catch ( Exception e )
 132    {
 133    // Shouldn't happen as long as all Visitors extend this class
 134    // and this class continues to implement visitObject(Object).
 135  0 e.printStackTrace( );
 136    }
 137    }
 138  0 return method;
 139    }
 140   
 141  0 public void visitObject(Object object)
 142    {
 143  0 System.err.println( "no visitor implementation for : " + object.getClass( ) + " : " + object );
 144    }
 145    }