001 /** 002 * ======================================== 003 * JFreeReport : a free Java report library 004 * ======================================== 005 * 006 * Project Info: http://reporting.pentaho.org/ 007 * 008 * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors. 009 * 010 * This library is free software; you can redistribute it and/or modify it under the terms 011 * of the GNU Lesser General Public License as published by the Free Software Foundation; 012 * either version 2.1 of the License, or (at your option) any later version. 013 * 014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 016 * See the GNU Lesser General Public License for more details. 017 * 018 * You should have received a copy of the GNU Lesser General Public License along with this 019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 020 * Boston, MA 02111-1307, USA. 021 * 022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 023 * in the United States and other countries.] 024 * 025 * ------------ 026 * $Id: ArrayValueConverter.java 3048 2007-07-28 18:02:42Z tmorgner $ 027 * ------------ 028 * (C) Copyright 2000-2005, by Object Refinery Limited. 029 * (C) Copyright 2005-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.report.util.beans; 032 033 import java.lang.reflect.Array; 034 import java.util.ArrayList; 035 036 import org.jfree.report.util.CSVTokenizer; 037 038 /** 039 * An ValueConverter that handles Arrays. Conversion to arrays is done 040 * using a CSV string. 041 * 042 * @author Thomas Morgner 043 */ 044 public class ArrayValueConverter implements ValueConverter 045 { 046 /** The converter for the array elements. */ 047 private ValueConverter elementConverter; 048 /** The element type. */ 049 private Class elementType; 050 051 /** 052 * Creates a new ArrayValueConverter for the given element type and 053 * array type. 054 * @param arrayClass the array type 055 * @param elementConverter the value converter for the array elements. 056 */ 057 public ArrayValueConverter (final Class arrayClass, 058 final ValueConverter elementConverter) 059 { 060 if (elementConverter == null) 061 { 062 throw new NullPointerException("elementConverter must not be null"); 063 } 064 if (arrayClass == null) 065 { 066 throw new NullPointerException("arrayClass must not be null"); 067 } 068 this.elementType = arrayClass; 069 this.elementConverter = elementConverter; 070 } 071 072 /** 073 * Converts an object to an attribute value. 074 * 075 * @param o the object. 076 * @return the attribute value. 077 * @throws BeanException if there was an error during the conversion. 078 */ 079 public String toAttributeValue (final Object o) throws BeanException 080 { 081 final int size = Array.getLength(o); 082 final StringBuffer buffer = new StringBuffer(); 083 for (int i = 0; i < size; i++) 084 { 085 if (i != 0) 086 { 087 buffer.append(","); 088 } 089 buffer.append(elementConverter.toAttributeValue(Array.get(o, i))); 090 } 091 return buffer.toString(); 092 } 093 094 /** 095 * Converts a string to a property value. 096 * 097 * @param s the string. 098 * @return a property value. 099 * @throws BeanException if there was an error during the conversion. 100 */ 101 public Object toPropertyValue (final String s) throws BeanException 102 { 103 final CSVTokenizer tokenizer = new CSVTokenizer(s); 104 final ArrayList elements = new ArrayList(); 105 while (tokenizer.hasMoreTokens()) 106 { 107 final String token = tokenizer.nextToken(); 108 elements.add(elementConverter.toPropertyValue(token)); 109 } 110 final Object retval = 111 Array.newInstance(elementType, elements.size()); 112 for (int i = 0; i < elements.size(); i++) 113 { 114 final Object o = elements.get(i); 115 Array.set(retval, i, o); 116 } 117 return retval; 118 } 119 }