| /******************************************************************************* |
| * Copyright (c) 2009, 2014 Xored Software Inc and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Xored Software Inc - initial API and implementation and/or initial documentation |
| *******************************************************************************/ |
| package org.eclipse.rcptt.util; |
| |
| import static java.lang.String.format; |
| import static java.util.Collections.emptyList; |
| |
| import java.lang.reflect.Field; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.util.Collections; |
| import java.util.List; |
| |
| public class ReflectionUtil { |
| public static Object callMethod(Object instance, String name, |
| List<Class<?>> argTypes, List<Object> args, boolean checked) |
| throws NoSuchMethodException, IllegalAccessException, |
| InvocationTargetException { |
| Class<?> clazz = instance.getClass(); |
| Method method = findMethod(clazz, name, argTypes); |
| if (method == null) { |
| if (checked) { |
| throw new NoSuchMethodException(format("Clas: $s, method: %s", |
| clazz, name)); |
| } |
| return null; |
| } |
| |
| method.setAccessible(true); |
| try { |
| return method.invoke(instance, |
| args.toArray(new Object[args.size()])); |
| } catch (IllegalAccessException e) { |
| if (checked) { |
| throw e; |
| } |
| return null; |
| } catch (InvocationTargetException e) { |
| if (checked) { |
| throw e; |
| } |
| return null; |
| } |
| } |
| |
| /** |
| * Safe call for a method without args, returns null in case of any error |
| * |
| * @param instance |
| * @param name |
| * @return |
| */ |
| public static Object callMethod(Object instance, String name) { |
| try { |
| return callMethod(instance, name, |
| Collections.<Class<?>> emptyList(), emptyList(), false); |
| } catch (Exception e) { |
| return null; |
| } |
| } |
| |
| public static Object getField(Object instance, String name) { |
| try { |
| return getField(instance, name, false); |
| } catch (NoSuchFieldException e) { |
| return null; // Can't happen |
| } catch (IllegalAccessException e) { |
| return null; // Can't happen |
| } |
| } |
| |
| /** |
| * Returns field value. |
| * |
| * @param instance |
| * @param name |
| * @param checked |
| * Controls error handling when field is not found or value |
| * cannot be retrieved. When <code>true</code>, throws |
| * {@link NoSuchFieldException} or {@link IllegalAccessException} |
| * , otherwise returns <code>null</code> |
| * @return |
| * @throws NoSuchFieldException |
| * @throws IllegalAccessException |
| */ |
| public static Object getField(Object instance, String name, boolean checked) |
| throws NoSuchFieldException, IllegalAccessException { |
| Class<? extends Object> clazz = instance.getClass(); |
| Field field = findField(clazz, name); |
| |
| if (field == null) { |
| if (checked) { |
| throw new NoSuchFieldException(format("Class: %s, field: %s", |
| clazz, name)); |
| } |
| return null; |
| } |
| field.setAccessible(true); |
| try { |
| return field.get(instance); |
| } catch (IllegalAccessException e) { |
| if (checked) { |
| throw e; |
| } |
| return null; |
| } |
| } |
| |
| /** |
| * searches for declared field in given class and all superclasses |
| * |
| * @param clazz |
| * @param name |
| * @return {@link Field} or <code>null</code> |
| */ |
| public static Field findField(Class<?> clazz, String name) { |
| if (clazz == null) { |
| return null; |
| } |
| try { |
| return clazz.getDeclaredField(name); |
| } catch (SecurityException e) { |
| return null; |
| } catch (NoSuchFieldException e) { |
| return findField(clazz.getSuperclass(), name); |
| } |
| } |
| |
| public static Method findMethod(Class<?> clazz, String name) { |
| return findMethod(clazz, name, Collections.<Class<?>> emptyList()); |
| } |
| |
| public static Method findMethod(Class<?> clazz, String name, |
| List<Class<?>> params) { |
| if (clazz == null) { |
| return null; |
| } |
| |
| try { |
| return clazz.getDeclaredMethod(name, |
| params.toArray(new Class<?>[params.size()])); |
| } catch (NoSuchMethodException e) { |
| return findMethod(clazz.getSuperclass(), name, params); |
| } catch (SecurityException e) { |
| return null; |
| } |
| } |
| |
| } |