| 1 | /** |
| 2 | * Copyright (C) 2006 NetMind Consulting Bt. |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 3 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | */ |
| 18 | |
| 19 | package hu.netmind.beankeeper.model.impl; |
| 20 | |
| 21 | import hu.netmind.beankeeper.service.StoreContext; |
| 22 | import java.util.*; |
| 23 | import java.lang.reflect.Method; |
| 24 | import org.apache.log4j.Logger; |
| 25 | import hu.netmind.beankeeper.common.StoreException; |
| 26 | import hu.netmind.beankeeper.model.*; |
| 27 | |
| 28 | /** |
| 29 | * Information and transformations on a given class. |
| 30 | * @author Brautigam Robert |
| 31 | * @version Revision: $Revision$ |
| 32 | */ |
| 33 | public class StrictDynamicHandler extends StrictStaticHandler |
| 34 | { |
| 35 | private static Logger logger = Logger.getLogger(StrictDynamicHandler.class); |
| 36 | |
| 37 | private Map<String,Class> dynamicAttributes = null;; |
| 38 | private Map<String,String> dynamicAttributeCase = null; |
| 39 | |
| 40 | private ClassTracker classTracker = null; |
| 41 | |
| 42 | StrictDynamicHandler(ClassTracker classTracker, ClassEntry sourceEntry) |
| 43 | { |
| 44 | // Init static attributes |
| 45 | super(sourceEntry); |
| 46 | this.classTracker=classTracker; |
| 47 | update(); |
| 48 | } |
| 49 | |
| 50 | public void update() |
| 51 | { |
| 52 | dynamicAttributes = new HashMap<String,Class>(); |
| 53 | dynamicAttributeCase = new HashMap<String,String>(); |
| 54 | for ( Map.Entry<String,Class> entry : getPersistenceAttributeTypes(getSourceEntry()).entrySet() ) |
| 55 | { |
| 56 | dynamicAttributeCase.put(entry.getKey().toLowerCase(),entry.getKey()); |
| 57 | dynamicAttributes.put(entry.getKey().toLowerCase(),entry.getValue()); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Get the dynamic attributes types of an object. |
| 63 | * @return The dynamic types map, or null, if object is not dynamic. |
| 64 | */ |
| 65 | public static Map<String,Class> getPersistenceAttributeTypes(ClassEntry entry) |
| 66 | { |
| 67 | Method method = null; |
| 68 | Class current = entry.getSourceClass(); |
| 69 | while ( (current != null) && (method==null) ) |
| 70 | { |
| 71 | try |
| 72 | { |
| 73 | method = current.getDeclaredMethod("getPersistenceAttributeTypes",new Class[] { Class.class, String.class }); |
| 74 | } catch ( NoSuchMethodException e ) { |
| 75 | // No problem |
| 76 | if ( logger.isDebugEnabled() ) |
| 77 | logger.debug("given class had no getPersistenceAttributeTypes method for dynamic attributes: "+entry); |
| 78 | } |
| 79 | current = current.getSuperclass(); |
| 80 | } |
| 81 | if ( method == null ) |
| 82 | { |
| 83 | logger.debug("dyanmic attributes method not found in "+entry); |
| 84 | return null; // If no such method, then this has no dynamic attrs |
| 85 | } |
| 86 | try |
| 87 | { |
| 88 | Map result = (Map) method.invoke(null,new Object[] { entry.getSourceClass(), entry.getDynamicName() }); |
| 89 | if ( logger.isDebugEnabled() ) |
| 90 | logger.debug("determined dynamic attributes for '"+entry+"': "+result); |
| 91 | return result; |
| 92 | } catch ( Exception e ) { |
| 93 | throw new StoreException("error while getting dynamic attribute types",e); |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | public Map getAttributeTypes() |
| 98 | { |
| 99 | Map result = new HashMap(); |
| 100 | result.putAll(super.getAttributeTypes()); |
| 101 | result.putAll(dynamicAttributes); |
| 102 | return result; |
| 103 | } |
| 104 | |
| 105 | public List getAttributeNames() |
| 106 | { |
| 107 | List result = new ArrayList(); |
| 108 | result.addAll(super.getAttributeNames()); |
| 109 | result.addAll(dynamicAttributes.keySet()); |
| 110 | return result; |
| 111 | } |
| 112 | |
| 113 | public boolean hasChanged() |
| 114 | { |
| 115 | // Generate lower case attribute names map |
| 116 | Map<String,Class> currentAttributes = new HashMap<String,Class>(); |
| 117 | for ( Map.Entry<String,Class> entry : getPersistenceAttributeTypes(getSourceEntry()).entrySet() ) |
| 118 | currentAttributes.put(entry.getKey().toLowerCase(),entry.getValue()); |
| 119 | // Compare |
| 120 | return ! currentAttributes.equals(dynamicAttributes); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Return whether given attribute is a static attribute, which has priority. |
| 125 | */ |
| 126 | private boolean isStatic(String attributeName) |
| 127 | { |
| 128 | return super.getAttributeNames().contains(attributeName); |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Get the attribute value from a given object of this class and |
| 133 | * from given attribute. |
| 134 | */ |
| 135 | public Object getAttributeValue(Object obj, String attributeName) |
| 136 | { |
| 137 | if ( isStatic(attributeName) ) |
| 138 | return super.getAttributeValue(obj,attributeName); |
| 139 | return ((Map) obj).get(dynamicAttributeCase.get(attributeName.toLowerCase())); |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Set an object as value into object given. |
| 144 | */ |
| 145 | public void setAttributeValue(Object obj, String attributeName, Object value) |
| 146 | { |
| 147 | // Handle static attribute |
| 148 | if ( isStatic(attributeName) ) |
| 149 | { |
| 150 | super.setAttributeValue(obj,attributeName,value); |
| 151 | return; |
| 152 | } |
| 153 | // Get data |
| 154 | attributeName = attributeName.toLowerCase(); |
| 155 | String realAttributeName = dynamicAttributeCase.get(attributeName); |
| 156 | Class attributeClass = dynamicAttributes.get(attributeName); |
| 157 | // Check if value is null. Remove the key, if the value is null. |
| 158 | Map map = (Map) obj; |
| 159 | Class valueClass = null; |
| 160 | if ( value == null ) |
| 161 | { |
| 162 | map.remove(realAttributeName); |
| 163 | return; |
| 164 | } |
| 165 | valueClass = value.getClass(); |
| 166 | // Handle primitive types with exceptional circumstances |
| 167 | if ( (attributeClass.equals(Character.class)) || (attributeClass.equals(char.class)) |
| 168 | && (valueClass.equals(String.class)) ) |
| 169 | { |
| 170 | if ( ((String) value).length() > 0 ) |
| 171 | map.put(realAttributeName, new Character(((String) value).charAt(0))); |
| 172 | } |
| 173 | // Byte array |
| 174 | else if ( attributeClass.equals(byte[].class) ) |
| 175 | map.put(realAttributeName,value); |
| 176 | // Boolean |
| 177 | else if ( (attributeClass.equals(Boolean.class) || attributeClass.equals(boolean.class)) |
| 178 | && ((valueClass.equals(Integer.class)) || |
| 179 | (valueClass.equals(Long.class))) ) |
| 180 | { |
| 181 | map.put(realAttributeName, new Boolean(((Number) value).intValue() > 0)); |
| 182 | } |
| 183 | // Easy primitive classes |
| 184 | else if ( valueClass.equals(String.class) || |
| 185 | valueClass.equals(Date.class) || |
| 186 | valueClass.equals(Boolean.class) |
| 187 | ) |
| 188 | map.put(realAttributeName,value); |
| 189 | // Container classes |
| 190 | else if ( (value instanceof Map) || (value instanceof List) ) |
| 191 | map.put(realAttributeName,value); |
| 192 | // Not easy number classes |
| 193 | else if ( value instanceof Number ) |
| 194 | { |
| 195 | Number number = (Number) value; |
| 196 | if ( attributeClass.equals(Byte.class) || attributeClass.equals(byte.class) ) |
| 197 | map.put(realAttributeName,new Byte(number.byteValue())); |
| 198 | if ( attributeClass.equals(Double.class) || attributeClass.equals(double.class) ) |
| 199 | map.put(realAttributeName,new Double(number.doubleValue())); |
| 200 | if ( attributeClass.equals(Float.class) || attributeClass.equals(float.class) ) |
| 201 | map.put(realAttributeName,new Float(number.floatValue())); |
| 202 | if ( attributeClass.equals(Integer.class) || attributeClass.equals(int.class) ) |
| 203 | map.put(realAttributeName,new Integer(number.intValue())); |
| 204 | if ( attributeClass.equals(Long.class) || attributeClass.equals(long.class) ) |
| 205 | map.put(realAttributeName,new Long(number.longValue())); |
| 206 | if ( attributeClass.equals(Short.class) || attributeClass.equals(short.class) ) |
| 207 | map.put(realAttributeName,new Short(number.shortValue())); |
| 208 | } |
| 209 | // All other objects |
| 210 | else { |
| 211 | if ( (value!=null) || |
| 212 | (classTracker.getType(attributeClass)!=ClassTracker.ClassType.TYPE_PRIMITIVE) ) |
| 213 | map.put(realAttributeName,value); |
| 214 | } |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | |