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/*
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* JBind
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*
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* Copyright (c) by Stefan Wachter. All rights reserved.
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*
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* Usage, modification, and redistribution is subject to license terms that are
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* available at 'http://www.jbind.org'. The JBind license is like the
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* 'Apache Software License V 1.1'.
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*/
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package org.jbind.util.reflect;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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/**
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* Static utility methods for the generator.
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*/
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public class ReflectUtil {
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private ReflectUtil() {}
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/**
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* Returns the type name of the specified class. Arrays and inner classes are
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* supported.
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*
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* @param The class whose type name is needed. <i>(required)</i>
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* @return The type name of the specified class. <i>(required)</i>
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*/
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public static String getTypeName(Class aClass) {
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String typeName = null;
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if (aClass.isArray()) {
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Class componentType = aClass.getComponentType();
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typeName = getTypeName(componentType) + "[]";
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} else {
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// Reflection returns class names in which the inner parts of names are
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// separated by '$'. These must be replaced by '.'.
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StringBuffer sb = new StringBuffer(aClass.getName());
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for (int i = 0; i < sb.length(); i++) {
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if (sb.charAt(i) == '$') {
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sb.setCharAt(i, '.');
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}
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}
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typeName = sb.toString();
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}
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return typeName;
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}
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/**
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* Removes all classes from the specified collection that have a (real) super class
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* in the collection.
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*
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* @param aClasses The classes that are considered. <i>(required)</i>
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* @return A list of the classes that have no (real) super classes in the
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* specified collection. <i>(required)</i>
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*/
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public static List removeSubClasses(Collection aClasses) {
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List res = new ArrayList();
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for (Iterator i = aClasses.iterator(); i.hasNext(); ) {
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Class candidate = (Class)i.next();
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boolean include = true;
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for (Iterator j = aClasses.iterator(); j.hasNext(); ) {
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Class c = (Class)j.next();
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if (candidate == c) {
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continue;
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}
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if (c.isAssignableFrom(candidate)) {
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include = false;
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break;
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}
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}
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if (include) {
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res.add(candidate);
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}
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}
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return res;
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}
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/**
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* Sorts the classes according to their subclass relationship. Super classes are
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* guaranteed to be in the list before their sub classes.
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*
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* @param aClasses The classes to sort. <i>(required)</i>
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* @return The sorted classes. <i>(required)</i>
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*/
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public static List sortClasses(Collection aClasses) {
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List res = new ArrayList();
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int nbClasses = aClasses.size();
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for (int i = 0; i < nbClasses; i++) {
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for (Iterator j = aClasses.iterator(); j.hasNext(); ) {
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Class candidate = (Class)j.next();
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boolean isTop = true;
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for (Iterator k = aClasses.iterator(); k.hasNext(); ) {
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Class c = (Class)k.next();
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if ((c != candidate) && c.isAssignableFrom(candidate)) {
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// c is a super class of the candidate
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isTop = false;
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break;
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}
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}
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if (isTop) {
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res.add(candidate);
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j.remove();
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break;
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}
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}
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}
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return res;
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}
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public static final Class getWrapperClass(Class aClass) {
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Class res = null;
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if (aClass.isPrimitive()) {
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String name = aClass.getName();
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if (name.equals("byte")) {
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res = Byte.class;
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} else if (name.equals("short")) {
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res = Short.class;
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} else if (name.equals("int")) {
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res = Integer.class;
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} else if (name.equals("long")) {
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res = Long.class;
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} else if (name.equals("float")) {
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res = Float.class;
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} else if (name.equals("double")) {
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res = Double.class;
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} else if (name.equals("boolean")) {
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res = Boolean.class;
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} else if (name.equals("char")) {
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res = Character.class;
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}
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assert null != res;
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} else {
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res = aClass;
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}
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return res;
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}
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/**
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* Tries to set the members of an object by their setter-methods if there is
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* a corresponding value in the map.
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* <p>
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* The method proceeds by iterating over all methods of the object selecting
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* those whose method names have the prefix "set". The member name is derived as the
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* remaining part of the method name (possibly an upper and lower case first
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* letter). For each such method it is tested the map contains a value
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* for the corresponding member name and if the method needs a single parameter
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* to set the member. If both conditions are true, it is tested if the value
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* in the map is assignment compatible with the parameter class of the
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* setter method. If this is not the case than it is tried to construct a
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* suitable parameter object from the value. Finally the setter method is called.
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*
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* @param anObject <i>(required)</i>.
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* @param aMap <i>(required)</i>. The values that are set are removed from
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* the map. Therefore the success of the method may be checked by testing
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* the map for emptiness.
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*/
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public static void setMembers(Object anObject, Map aMap) throws Exception {
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Method[] ma = anObject.getClass().getMethods();
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for (int i = 0; i < ma.length; i++) {
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Method m = ma[i];
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String methodName = m.getName();
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// check if the method is a setter
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if (!methodName.startsWith("set")) {
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continue;
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}
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// Calculate the attributeName and try to get its value from the hashtable.
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// Consider the first letter being upper or lower case.
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String attributeName;
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StringBuffer sb = new StringBuffer();
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sb.append(methodName.substring(3));
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attributeName = sb.toString();
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Object value = aMap.get(attributeName);
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if (null == value) {
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sb.setCharAt(0, Character.toLowerCase(sb.charAt(0)));
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attributeName = sb.toString();
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value = aMap.get(attributeName);
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}
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if (null == value) {
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continue;
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}
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// check if the setter has exactly one parameter
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Class[] pa = m.getParameterTypes();
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if ((pa.length == 0) || (pa.length > 1)) {
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continue;
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}
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// check if the parameter of the setter is assignment compatible
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Class originalParameterClass = pa[0];
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Class parameterClass = null;
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if (originalParameterClass.isPrimitive()) {
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// if the method needs a primitive type find the corresponding wrapper class
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String primitiveName = originalParameterClass.getName();
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if (primitiveName.equals("byte")) {
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parameterClass = Byte.class;
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} else if (primitiveName.equals("short")) {
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parameterClass = Short.class;
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} else if (primitiveName.equals("int")) {
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parameterClass = Integer.class;
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} else if (primitiveName.equals("long")) {
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parameterClass = Long.class;
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} else if (primitiveName.equals("float")) {
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parameterClass = Float.class;
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} else if (primitiveName.equals("double")) {
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parameterClass = Double.class;
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} else if (primitiveName.equals("boolean")) {
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parameterClass = Boolean.class;
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} else {
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parameterClass = Character.class;
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}
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} else {
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parameterClass = originalParameterClass;
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}
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// Determine the object which should be used in the setter method.
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Object useObject = null;
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if (parameterClass.isInstance(value)) {
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// The value from the hashtable can be used.
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useObject = value;
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} else {
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// Try to convert the value from the hashtable into the parameterClass
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Constructor constructor = parameterClass.getConstructor(new Class[]{ value.getClass() });
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useObject = constructor.newInstance(new Object[]{ value });
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}
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m.invoke(anObject, new Object[]{ useObject });
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// Remove the attribute from the value hashtable because finally
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// it will be checked if all attribute have been set.
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aMap.remove(attributeName);
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}
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}
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}
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