133 lines
4.7 KiB
Java
133 lines
4.7 KiB
Java
package fr.pandacube.lib.reflect;
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import java.lang.reflect.AccessibleObject;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Member;
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import java.lang.reflect.Method;
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/**
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* Abstract wrapper for a class member (field, method or constructor).
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* @param <T> the type of the class declaring the wrapped member.
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* @param <ID> type of object uniquely identifying the member into the class.
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* @param <EL> the type of the class member (like {@link Field}, {@link Method} or {@link Constructor})
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* @param <EX> the type of exception thrown by the {@link Class} method responsible to get the member instance (like
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* {@link NoSuchFieldException} or {@link NoSuchMethodException}).
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*/
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public sealed abstract class ReflectMember<T, ID, EL extends AccessibleObject & Member, EX extends ReflectiveOperationException>
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permits ReflectField, ReflectMethod, ReflectConstructor {
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/* package */ final ReflectClass<T> reflectClass;
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/* package */ final ID identifier;
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private final EL member;
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/* package */ ReflectMember(ReflectClass<T> c, ID id, boolean bypassFilter) throws EX {
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reflectClass = c;
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identifier = id;
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member = (bypassFilter) ? fetchFiltered() : fetch();
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}
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/* package */ EL fetch() throws EX {
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// get element in current class
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try {
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EL el = fetchFromClass(reflectClass.get());
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setAccessible(el);
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return el;
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} catch (ReflectiveOperationException e1) {
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@SuppressWarnings("unchecked")
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EX ex = (EX) e1;
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// get parent class
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Class<? super T> superClass = reflectClass.get().getSuperclass();
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if (superClass == null)
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throw ex;
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// get element in parent class (will do recursion)
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try {
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EL el = fetchFromReflectClass(Reflect.ofClass(superClass));
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setAccessible(el);
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return el;
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} catch (ReflectiveOperationException e2) {
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ex.addSuppressed(e2);
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throw ex;
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}
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}
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}
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/* package */ EL fetchFiltered() throws EX {
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// get element in current class
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try {
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EL el = fetchFromClass(reflectClass.get());
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setAccessible(el);
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return el;
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} catch (ReflectiveOperationException e1) {
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@SuppressWarnings("unchecked")
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EX ex = (EX) e1;
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// trying to bypass filtered member
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try {
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@SuppressWarnings("unchecked")
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EL[] elements = (EL[]) Reflect.ofClassOfInstance(reflectClass.get())
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.method(internalMethodNameElementArray(), boolean.class)
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.invoke(reflectClass.get(), false);
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for (EL element : elements) {
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if (isEqualOurElement(element)) {
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// the values in the elements array have to be copied
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// (using special private methods in reflection api) before using it
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Object reflectionFactoryOfClazz = Reflect.ofClassOfInstance(reflectClass.get())
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.method("getReflectionFactory")
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.invoke(reflectClass.get());
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@SuppressWarnings("unchecked")
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EL copiedElement = (EL) Reflect.ofClassOfInstance(reflectionFactoryOfClazz)
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.method(internalMethodNameCopyElement(), element.getClass())
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.invoke(reflectionFactoryOfClazz, element);
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setAccessible(copiedElement);
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return copiedElement;
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}
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}
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} catch (ReflectiveOperationException e2) {
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ex.addSuppressed(e2);
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}
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throw ex;
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}
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}
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/* package */ abstract EL fetchFromClass(Class<T> clazz) throws EX;
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/* package */ abstract EL fetchFromReflectClass(ReflectClass<?> rc) throws EX;
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/* package */ abstract boolean isEqualOurElement(EL el);
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/* package */ abstract String internalMethodNameElementArray();
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/* package */ abstract String internalMethodNameCopyElement();
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/* package */ void setAccessible(EL el) {
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el.setAccessible(true);
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}
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/**
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* Returns the wrapped class member.
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* @return the wrapped class member.
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*/
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public EL get() {
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return member;
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}
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/**
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* Returns the modifiers of the wrapped class member.
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* @return the modifiers of the wrapped class member.
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* @see Field#getModifiers()
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* @see Method#getModifiers()
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* @see Constructor#getModifiers()
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*/
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public int getModifiers() {
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return get().getModifiers();
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}
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}
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