svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.expressionevaluator / org.gvsig.expressionevaluator.lib / org.gvsig.expressionevaluator.lib.impl / src / main / java / org / gvsig / expressionevaluator / impl / InstanceUtils.java @ 46057
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1 | 44243 | jjdelcerro | package org.gvsig.expressionevaluator.impl; |
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2 | |||
3 | import java.lang.reflect.Method; |
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4 | import org.apache.commons.lang3.StringUtils; |
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5 | |||
6 | |||
7 | /**
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8 | *
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9 | * @author jjdelcerro
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10 | */
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11 | public class InstanceUtils { |
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12 | |||
13 | public static Object callmethod(Object instance, String methodName, Object args[]) throws Exception { |
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14 | if( StringUtils.isBlank(methodName) ) {
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15 | throw new NullPointerException("A method name was expected to invoke and a null was received"); |
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16 | } |
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17 | if( instance==null ) { |
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18 | throw new NullPointerException("An object pointer was expected to invoke method "+methodName+" and a null was received"); |
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19 | } |
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20 | Class[] parameterTypes = new Class[args.length]; |
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21 | Object[] parameters = new Object[args.length]; |
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22 | for (int i = 0; i < parameters.length; i++) { |
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23 | Object parameter = args[i];
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24 | parameters[i] = parameter; |
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25 | if( parameter==null ) { |
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26 | parameterTypes[i] = null;
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27 | } else {
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28 | parameterTypes[i] = parameter.getClass(); |
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29 | } |
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30 | } |
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31 | Class<?> theClass = instance.getClass();
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32 | 46056 | jjdelcerro | Method method;
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33 | try {
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34 | method = theClass.getMethod(methodName, parameterTypes); |
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35 | } catch(NoSuchMethodException ex) { |
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36 | // Esto es para esquivar casos como tener un ArrayList de objects y
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37 | // hacer algo como arr.add(10). Dice que no hay ningun metodo add
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38 | // que reciba un Integer, por que realmente el add esta declarado como
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39 | // que recibe un object.
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40 | // Ver TestInterpreter metodo testListAppend.
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41 | for (Method m : theClass.getMethods()) { |
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42 | if( StringUtils.equals(m.getName(), methodName) && parameterTypes.length == m.getParameterTypes().length) {
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43 | parameterTypes = m.getParameterTypes(); |
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44 | 46057 | jjdelcerro | break;
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45 | 46056 | jjdelcerro | } |
46 | } |
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47 | method = theClass.getMethod(methodName, parameterTypes); |
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48 | } |
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49 | 44243 | jjdelcerro | Object value = method.invoke(instance, parameters);
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50 | return value;
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51 | } |
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52 | |||
53 | } |