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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package org.gvsig.expressionevaluator.impl; |
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import java.lang.reflect.Method; |
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import org.apache.commons.lang3.StringUtils; |
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/**
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*
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* @author jjdelcerro
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*/
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public class InstanceUtils { |
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public static Object callmethod(Object instance, String methodName, Object args[]) throws Exception { |
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if( StringUtils.isBlank(methodName) ) {
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throw new NullPointerException("A method name was expected to invoke and a null was received"); |
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} |
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if( instance==null ) { |
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throw new NullPointerException("An object pointer was expected to invoke method "+methodName+" and a null was received"); |
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} |
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Class[] parameterTypes = new Class[args.length]; |
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Object[] parameters = new Object[args.length]; |
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for (int i = 0; i < parameters.length; i++) { |
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Object parameter = args[i];
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parameters[i] = parameter; |
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if( parameter==null ) { |
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parameterTypes[i] = null;
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} else {
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parameterTypes[i] = parameter.getClass(); |
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} |
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} |
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Class<?> theClass = instance.getClass();
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Method method = null; |
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try {
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method = theClass.getMethod(methodName, parameterTypes); |
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} catch(NoSuchMethodException ex) { |
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} |
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if( method == null ) { |
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// Uf esto arregla cosas de StringBuilder.append, pero no
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// crea que sea correcto.
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for (int i = 0; i < parameters.length; i++) { |
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Object parameter = args[i];
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parameters[i] = parameter; |
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if( parameter==null ) { |
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parameterTypes[i] = null;
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} else {
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parameterTypes[i] = Object.class;
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} |
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} |
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} |
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try {
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method = theClass.getMethod(methodName, parameterTypes); |
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} catch(NoSuchMethodException ex) { |
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} |
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if( method == null ) { |
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// Esto es para esquivar casos como tener un ArrayList de objects y
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// hacer algo como arr.add(10). Dice que no hay ningun metodo add
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// que reciba un Integer, por que realmente el add esta declarado como
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// que recibe un object.
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// Ver TestInterpreter metodo testListAppend.
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for (Method m : theClass.getMethods()) { |
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if( StringUtils.equals(m.getName(), methodName) && parameterTypes.length == m.getParameterTypes().length) {
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parameterTypes = m.getParameterTypes(); |
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break;
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} |
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} |
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method = theClass.getMethod(methodName, parameterTypes); |
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} |
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Object value = method.invoke(instance, parameters);
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return value;
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} |
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} |