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 @ 47248
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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 | 46932 | jjdelcerro | Method method = null; |
| 33 | 46056 | jjdelcerro | try {
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| 34 | method = theClass.getMethod(methodName, parameterTypes); |
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| 35 | } catch(NoSuchMethodException ex) { |
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| 36 | 46932 | jjdelcerro | } |
| 37 | if( method == null ) { |
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| 38 | // Uf esto arregla cosas de StringBuilder.append, pero no
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| 39 | // crea que sea correcto.
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| 40 | for (int i = 0; i < parameters.length; i++) { |
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| 41 | Object parameter = args[i];
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| 42 | parameters[i] = parameter; |
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| 43 | if( parameter==null ) { |
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| 44 | parameterTypes[i] = null;
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| 45 | } else {
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| 46 | parameterTypes[i] = Object.class;
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| 47 | } |
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| 48 | } |
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| 49 | } |
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| 50 | try {
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| 51 | method = theClass.getMethod(methodName, parameterTypes); |
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| 52 | } catch(NoSuchMethodException ex) { |
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| 53 | } |
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| 54 | if( method == null ) { |
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| 55 | 46056 | jjdelcerro | // Esto es para esquivar casos como tener un ArrayList de objects y
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| 56 | // hacer algo como arr.add(10). Dice que no hay ningun metodo add
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| 57 | // que reciba un Integer, por que realmente el add esta declarado como
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| 58 | // que recibe un object.
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| 59 | // Ver TestInterpreter metodo testListAppend.
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| 60 | for (Method m : theClass.getMethods()) { |
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| 61 | if( StringUtils.equals(m.getName(), methodName) && parameterTypes.length == m.getParameterTypes().length) {
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| 62 | parameterTypes = m.getParameterTypes(); |
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| 63 | 46057 | jjdelcerro | break;
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| 64 | 46056 | jjdelcerro | } |
| 65 | } |
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| 66 | method = theClass.getMethod(methodName, parameterTypes); |
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| 67 | } |
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| 68 | 44243 | jjdelcerro | Object value = method.invoke(instance, parameters);
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| 69 | return value;
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| 70 | } |
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| 71 | |||
| 72 | } |