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1 package org.drools.semantics.java; 2 3 /* 4 $Id: ClassObjectType.java,v 1.8 2003/03/25 19:47:29 tdiesler Exp $ 5 6 Copyright 2002 (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 10 that the following conditions are met: 11 12 1. Redistributions of source code must retain copyright 13 statements and notices. Redistributions must also contain a 14 copy of this document. 15 16 2. Redistributions in binary form must reproduce the 17 above copyright notice, this list of conditions and the 18 following disclaimer in the documentation and/or other 19 materials provided with the distribution. 20 21 3. The name "drools" must not be used to endorse or promote 22 products derived from this Software without prior written 23 permission of The Werken Company. For written permission, 24 please contact bob@werken.com. 25 26 4. Products derived from this Software may not be called "drools" 27 nor may "drools" appear in their names without prior written 28 permission of The Werken Company. "drools" is a registered 29 trademark of The Werken Company. 30 31 5. Due credit should be given to The Werken Company. 32 (http://drools.werken.com/). 33 34 THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS 35 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 36 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 37 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 38 THE WERKEN COMPANY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 39 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 40 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 41 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 42 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 43 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 44 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 45 OF THE POSSIBILITY OF SUCH DAMAGE. 46 47 */ 48 49 import org.apache.commons.beanutils.ConversionException; 50 import org.apache.commons.beanutils.ConvertUtils; 51 import org.apache.commons.beanutils.Converter; 52 import org.drools.spi.ObjectType; 53 54 /*** Java class semantics <code>ObjectType</code>. 55 * 56 * @author <a href="mailto:bob@werken.com">bob@werken.com</a> 57 * 58 * @version $Id: ClassObjectType.java,v 1.8 2003/03/25 19:47:29 tdiesler Exp $ 59 */ 60 public class ClassObjectType implements ObjectType 61 { 62 63 // ------------------------------------------------------------ 64 // Class initialization 65 // ------------------------------------------------------------ 66 67 /*** Register conversions for jakarta-beanutils. 68 */ 69 static 70 { 71 ConvertUtils.register( 72 new Converter() 73 { 74 public Object convert(Class type, Object value) 75 { 76 if ( value instanceof Class ) 77 { 78 return (Class) value; 79 } 80 else if ( value instanceof String ) 81 { 82 ClassLoader cl = Thread.currentThread().getContextClassLoader(); 83 84 if ( cl == null ) 85 { 86 cl = getClass().getClassLoader(); 87 } 88 try 89 { 90 return cl.loadClass( (String) value ); 91 } 92 catch (Exception e) 93 { 94 throw new ConversionException( "Cannot convert " + value + " to a java.lang.Class", 95 e ); 96 } 97 } 98 throw new ConversionException( "Cannot convert " + value + " to a java.lang.Class" ); 99 } 100 }, 101 Class.class 102 ); 103 } 104 105 // ------------------------------------------------------------ 106 // Instance members 107 // ------------------------------------------------------------ 108 109 /*** Java object class. */ 110 private Class objectTypeClass; 111 112 // ------------------------------------------------------------ 113 // Constructors 114 // ------------------------------------------------------------ 115 116 /*** Construct, partially. 117 * 118 * @see #setType 119 */ 120 public ClassObjectType() 121 { 122 this.objectTypeClass = java.lang.Object.class; 123 } 124 125 /*** Construct. 126 * 127 * @param objectTypeClass Java object class. 128 */ 129 public ClassObjectType(Class objectTypeClass) 130 { 131 this.objectTypeClass = objectTypeClass; 132 } 133 134 // ------------------------------------------------------------ 135 // Instance methods 136 // ------------------------------------------------------------ 137 138 /*** Set the Java object class. 139 * 140 * @param objectTypeClass The Java object class. 141 */ 142 public void setType(Class objectTypeClass) 143 { 144 this.objectTypeClass = objectTypeClass; 145 } 146 147 /*** Return the Java object class. 148 * 149 * @return The Java object class. 150 */ 151 public Class getType() 152 { 153 return this.objectTypeClass; 154 } 155 156 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 157 // org.drools.spi.ObjectType 158 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 159 160 /*** Determine if the passed <code>Object</code> 161 * belongs to the object type defined by this 162 * <code>objectType</code> instance. 163 * 164 * @param object The <code>Object</code> to test. 165 * 166 * @return <code>true</code> if the <code>Object</code> 167 * matches this object type, else <code>false</code>. 168 */ 169 public boolean matches(Object object) 170 { 171 return getType().isInstance( object ); 172 } 173 174 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 175 // java.lang.Object 176 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 177 178 /*** Determine if another object is equal to this. 179 * 180 * @param thatObj The object to test. 181 * 182 * @return <code>true</code> if <code>thatObj</code> is equal 183 * to this, otherwise <code>false</code>. 184 */ 185 public boolean equals(Object thatObj) 186 { 187 if ( thatObj == null 188 || 189 ( ! ( thatObj instanceof ClassObjectType ) ) ) 190 { 191 return false; 192 } 193 194 ClassObjectType that = (ClassObjectType) thatObj; 195 196 return ( getType().equals( that.getType() ) ); 197 } 198 199 /*** Produce a debug string. 200 * 201 * @return The debug string. 202 */ 203 public String toString() 204 { 205 return "[ClassObjectType: type=" + getType().getName() + "]"; 206 } 207 208 /*** Produce the hash of this object. 209 * 210 * @return The hash. 211 */ 212 public int hashCode() 213 { 214 return getType().hashCode(); 215 } 216 }

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