Some refactor of Reflect class
This commit is contained in:
parent
66cbf8097c
commit
774b5f9e47
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@ -12,8 +12,6 @@ import java.util.Map;
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import java.util.Objects;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.TimeUnit;
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import java.util.function.Consumer;
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import java.util.function.Predicate;
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import com.google.common.cache.Cache;
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import com.google.common.cache.CacheBuilder;
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@ -106,7 +104,7 @@ public class Reflect {
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public static class ReflectClass<T> {
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private Class<T> clazz;
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private final Class<T> clazz;
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private final Map<MethodIdentifier, ReflectMethod<T>> methodCache = Collections.synchronizedMap(new HashMap<>());
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private final Map<ConstructorIdentifier, ReflectConstructor<T>> constructorCache = Collections.synchronizedMap(new HashMap<>());
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@ -116,24 +114,62 @@ public class Reflect {
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this.clazz = clazz;
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}
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private ReflectMethod<T> method(MethodIdentifier key) {
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return methodCache.computeIfAbsent(key, k -> new ReflectMethod<>(this, k));
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/**
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* Returns the class wrapped by this ReflectClass instance.
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*/
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public Class<T> get() {
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return clazz;
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}
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public ReflectMethod<T> method(String name, Class<?>... paramTypes) {
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return method(new MethodIdentifier(name, paramTypes));
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private ReflectMethod<T> method(MethodIdentifier key, boolean bypassFilter) throws NoSuchMethodException {
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ReflectMethod<T> method = methodCache.get(key);
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if (method == null) {
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method = new ReflectMethod<>(this, key, bypassFilter);
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methodCache.put(key, method);
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}
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return method;
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}
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private ReflectConstructor<T> constructor(ConstructorIdentifier key) {
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return constructorCache.computeIfAbsent(key, k -> new ReflectConstructor<>(this, k));
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public ReflectMethod<T> method(String name, Class<?>... paramTypes) throws NoSuchMethodException {
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return method(new MethodIdentifier(name, paramTypes), false);
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}
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public ReflectConstructor<T> constructor(Class<?>... paramTypes) {
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return constructor(new ConstructorIdentifier(paramTypes));
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public ReflectMethod<T> filteredMethod(String name, Class<?>... paramTypes) throws NoSuchMethodException {
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return method(new MethodIdentifier(name, paramTypes), true);
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}
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public ReflectField<T> field(String name) {
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return fieldCache.computeIfAbsent(name, n -> new ReflectField<>(this, n));
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private ReflectConstructor<T> constructor(ConstructorIdentifier key, boolean bypassFilter) throws NoSuchMethodException {
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ReflectConstructor<T> constructor = constructorCache.get(key);
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if (constructor == null) {
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constructor = new ReflectConstructor<>(this, key, bypassFilter);
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constructorCache.put(key, constructor);
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}
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return constructor;
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}
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public ReflectConstructor<T> constructor(Class<?>... paramTypes) throws NoSuchMethodException {
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return constructor(new ConstructorIdentifier(paramTypes), false);
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}
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public ReflectConstructor<T> filteredConstructor(Class<?>... paramTypes) throws NoSuchMethodException {
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return constructor(new ConstructorIdentifier(paramTypes), true);
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}
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private ReflectField<T> field0(String name, boolean bypassFilter) throws NoSuchFieldException {
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ReflectField<T> constructor = fieldCache.get(name);
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if (constructor == null) {
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constructor = new ReflectField<>(this, name, bypassFilter);
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fieldCache.put(name, constructor);
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}
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return constructor;
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}
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public ReflectField<T> field(String name) throws NoSuchFieldException {
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return field0(name, false);
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}
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public ReflectField<T> filteredField(String name) throws NoSuchFieldException {
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return field0(name, true);
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}
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}
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@ -159,45 +195,127 @@ public class Reflect {
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public static abstract class ReflectClassEl<T> {
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public static abstract class ReflectMember<T, EL, EX extends ReflectiveOperationException> {
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ReflectClass<T> reflectClass;
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protected EL cached;
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protected ReflectClassEl(ReflectClass<T> c) {
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protected ReflectMember(ReflectClass<T> c, boolean bypassFilter) throws EX {
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reflectClass = c;
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cached = (bypassFilter) ? fetchFiltered() : get();
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}
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protected EL fetch() throws EX {
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EX ex = null;
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// get element in current class
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try {
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EL el = fetchFromClass(reflectClass.clazz);
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setAccessible(el);
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return el;
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} catch (ReflectiveOperationException e) {
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@SuppressWarnings("unchecked")
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EX ee = (EX) e;
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ex = ee;
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}
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// get parent class
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Class<? super T> superClass = reflectClass.clazz.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(ofClass(superClass));
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setAccessible(el);
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return el;
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} catch (ReflectiveOperationException e) {
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ex.addSuppressed(e);
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throw ex;
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}
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}
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protected EL fetchFiltered() throws EX {
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EX ex = null;
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// get element in current class
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try {
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EL el = fetchFromClass(reflectClass.clazz);
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setAccessible(el);
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return el;
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} catch (ReflectiveOperationException e) {
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@SuppressWarnings("unchecked")
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EX ee = (EX) e;
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ex = ee;
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}
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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.clazz)
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.method(internalMethodNameElementArray(), boolean.class)
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.invoke(reflectClass.clazz, 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.clazz)
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.method("getReflectionFactory")
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.invoke(reflectClass.clazz);
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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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EL el = copiedElement;
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setAccessible(el);
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return el;
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}
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}
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} catch (ReflectiveOperationException e) {
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ex.addSuppressed(e);
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}
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throw ex;
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}
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protected abstract EL fetchFromClass(Class<T> clazz) throws EX;
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protected abstract EL fetchFromReflectClass(ReflectClass<?> rc) throws EX;
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protected abstract boolean isEqualOurElement(EL el);
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protected abstract String internalMethodNameElementArray();
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protected abstract String internalMethodNameCopyElement();
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protected abstract void setAccessible(EL el);
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public EL get() {
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return cached;
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}
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}
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public static class ReflectField<T> extends ReflectClassEl<T> {
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public static class ReflectField<T> extends ReflectMember<T, Field, NoSuchFieldException> {
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String elementName;
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private Field cached, cachedFiltered;
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/* package */ ReflectField(ReflectClass<T> c, String name) {
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super(c);
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/* package */ ReflectField(ReflectClass<T> c, String name, boolean bypassFilter) throws NoSuchFieldException {
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super(c, bypassFilter);
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elementName = name;
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}
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@Override protected Field fetchFromClass(Class<T> clazz) throws NoSuchFieldException { return clazz.getDeclaredField(elementName); };
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@Override protected Field fetchFromReflectClass(ReflectClass<?> rc) throws NoSuchFieldException { return rc.field(elementName).get(); };
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@Override protected boolean isEqualOurElement(Field el) { return elementName.equals(el.getName()); };
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@Override protected String internalMethodNameElementArray() { return "getDeclaredFields0"; };
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@Override protected String internalMethodNameCopyElement() { return "copyField"; };
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@Override protected void setAccessible(Field el) { el.setAccessible(true); }
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public synchronized Field get() throws NoSuchFieldException {
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if (cached == null) {
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cached = getDeclaredRecursively(reflectClass.clazz,
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c -> c.getDeclaredField(elementName),
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c -> ofClass(c).field(elementName).get(),
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f -> f.setAccessible(true));
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}
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return cached;
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}
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/* package */ synchronized Field getFiltered() throws NoSuchFieldException {
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if (cachedFiltered == null) {
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cachedFiltered = Reflect.getFiltered(reflectClass.clazz,
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c -> c.getDeclaredField(elementName),
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f -> f.setAccessible(true),
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f -> elementName.equals(f.getName()),
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"getDeclaredFields0", "copyField");
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}
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return cachedFiltered;
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}
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public Object getValue(Object instance) throws ReflectiveOperationException {
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return get().get(instance);
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@ -225,7 +343,7 @@ public class Reflect {
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// change the modifier in the Field instance so the method #set(instance, value) doesn’t throw an exception
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int modifiers = f.getModifiers();
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if (Modifier.isFinal(modifiers)) {
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ofClass(Field.class).field("modifiers").getFiltered().set(f, modifiers & ~Modifier.FINAL);
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ofClass(Field.class).field("modifiers").fetchFiltered().set(f, modifiers & ~Modifier.FINAL);
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}
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f.set(instance, value);
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}
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@ -243,42 +361,31 @@ public class Reflect {
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}
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public static class ReflectMethod<T> extends ReflectClassEl<T> {
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public static class ReflectMethod<T> extends ReflectMember<T, Method, NoSuchMethodException> {
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String elementName;
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private Method cached, cachedFiltered;
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MethodIdentifier methodId;
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Class<?>[] parameterTypes;
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/* package */ ReflectMethod(ReflectClass<T> c, MethodIdentifier methodId) {
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super(c);
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/* package */ ReflectMethod(ReflectClass<T> c, MethodIdentifier methodId, boolean bypassFilter) throws NoSuchMethodException {
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super(c, bypassFilter);
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this.elementName = methodId.methodName;
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this.methodId = methodId;
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parameterTypes = methodId.parameters;
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}
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public Method get() throws NoSuchMethodException {
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if (cached == null) {
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cached = getDeclaredRecursively(reflectClass.clazz,
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c -> c.getDeclaredMethod(elementName, parameterTypes),
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c -> ofClass(c).method(methodId).get(),
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m -> m.setAccessible(true));
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}
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return cached;
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}
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/* package */ Method getFiltered() throws NoSuchMethodException {
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if (cachedFiltered == null) {
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cachedFiltered = Reflect.getFiltered(reflectClass.clazz,
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c -> c.getDeclaredMethod(elementName, parameterTypes),
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m -> m.setAccessible(true),
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m -> elementName.equals(m.getName()) && Arrays.equals(parameterTypes, m.getParameterTypes()),
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"getDeclaredMethods0", "copyMethod");
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}
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return cachedFiltered;
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}
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@Override protected Method fetchFromClass(Class<T> clazz) throws NoSuchMethodException { return clazz.getDeclaredMethod(elementName, parameterTypes); };
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@Override protected Method fetchFromReflectClass(ReflectClass<?> rc) throws NoSuchMethodException { return rc.method(methodId, false).get(); };
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@Override protected boolean isEqualOurElement(Method el) { return elementName.equals(el.getName()) && Arrays.equals(parameterTypes, el.getParameterTypes()); };
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@Override protected String internalMethodNameElementArray() { return "getDeclaredMethods0"; };
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@Override protected String internalMethodNameCopyElement() { return "copyMethod"; };
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@Override protected void setAccessible(Method el) { el.setAccessible(true); }
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public Object invoke(Object instance, Object... values) throws ReflectiveOperationException {
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return get().invoke(instance, values);
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@ -289,40 +396,37 @@ public class Reflect {
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}
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}
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public static class ReflectConstructor<T> extends ReflectClassEl<T> {
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private Constructor<T> cached, cachedFiltered;
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public static class ReflectConstructor<T> extends ReflectMember<T, Constructor<T>, NoSuchMethodException> {
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ConstructorIdentifier constructorId;
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Class<?>[] parameterTypes;
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/* package */ ReflectConstructor(ReflectClass<T> c, ConstructorIdentifier constructorId) {
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super(c);
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/* package */ ReflectConstructor(ReflectClass<T> c, ConstructorIdentifier constructorId, boolean bypassFilter) throws NoSuchMethodException {
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super(c, bypassFilter);
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this.constructorId = constructorId;
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parameterTypes = constructorId.parameters;
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}
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public Constructor<T> get() throws NoSuchMethodException {
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if (cached == null) {
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Constructor<T> el = null;
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el = reflectClass.clazz.getDeclaredConstructor(parameterTypes);
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el.setAccessible(true);
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cached = el;
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}
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return cached;
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}
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/* package */ Constructor<T> getFiltered() throws NoSuchMethodException {
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if (cachedFiltered == null) {
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cachedFiltered = Reflect.getFiltered(reflectClass.clazz,
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c -> c.getDeclaredConstructor(parameterTypes),
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m -> m.setAccessible(true),
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m -> Arrays.equals(parameterTypes, m.getParameterTypes()),
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"getDeclaredConstructors0", "copyConstructor");
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}
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return cachedFiltered;
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// Override since we don't want to recursively search for a constructor
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@Override
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protected Constructor<T> fetch() throws NoSuchMethodException {
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Constructor<T> el = null;
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el = fetchFromClass(reflectClass.clazz);
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setAccessible(el);
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return el;
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}
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@Override protected Constructor<T> fetchFromClass(Class<T> clazz) throws NoSuchMethodException { return clazz.getDeclaredConstructor(parameterTypes); };
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@Override protected Constructor<T> fetchFromReflectClass(ReflectClass<?> rc) throws NoSuchMethodException { throw new UnsupportedOperationException(); };
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@Override protected boolean isEqualOurElement(Constructor<T> el) { return Arrays.equals(parameterTypes, el.getParameterTypes()); };
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@Override protected String internalMethodNameElementArray() { return "getDeclaredConstructors0"; };
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@Override protected String internalMethodNameCopyElement() { return "copyConstructor"; };
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@Override protected void setAccessible(Constructor<T> el) { el.setAccessible(true); }
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public T instanciate(Object... values) throws ReflectiveOperationException {
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return get().newInstance(values);
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@ -339,125 +443,11 @@ public class Reflect {
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private interface GetUncheckedClassReflectiveElement<T, E extends ReflectiveOperationException> {
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public T get(Class<?> clazz) throws E;
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}
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private interface GetReflectiveElement<C, T, E extends ReflectiveOperationException> {
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public T get(Class<C> clazz) throws E;
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}
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private static <C, T, E extends ReflectiveOperationException> T getDeclaredRecursively(
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Class<C> clazz, GetReflectiveElement<C, T, E> jlrGetter,
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GetUncheckedClassReflectiveElement<T, E> parentGetter, Consumer<T> setAccessible) throws E {
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Objects.requireNonNull(clazz, "Class instance not provided");
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E ex = null;
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T el = null;
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// get element in provided class
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try {
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el = jlrGetter.get(clazz);
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setAccessible.accept(el);
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} catch (ReflectiveOperationException e) {
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@SuppressWarnings("unchecked")
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E ee = (E) e;
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ex = ee;
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}
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// get element in parent class (will do recursion)
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if (el == null) {
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try {
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el = parentGetter.get(clazz.getSuperclass());
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} catch (ReflectiveOperationException e) {
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if (ex == null) {
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@SuppressWarnings("unchecked")
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E ee = (E) e;
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ex = ee;
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}
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else {
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ex.addSuppressed(e);
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}
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}
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}
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if (el == null)
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throw ex;
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return el;
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}
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/**
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* Get a Field or Method of a class that is not accessible using {@link Class#getDeclaredField(String)}
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* or using {@link Class#getDeclaredMethod(String, Class...)} because the implementation of {@link Class}
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* block its direct access.
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*
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* This method calls an internal method of {@link Class} to retrieve the full list of field or method, then
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* search in the list for the requested element.
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*/
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private static <C, T, E extends ReflectiveOperationException> T getFiltered(
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Class<C> clazz, GetReflectiveElement<C, T, E> jlrGetter,
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Consumer<T> setAccessible, Predicate<T> elementChecker,
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String privateMethodName, String copyMethodName) throws E {
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Objects.requireNonNull(clazz, "Class instance not provided");
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T el = null;
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E ex = null;
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try {
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el = jlrGetter.get(clazz);
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} catch (ReflectiveOperationException e) {
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@SuppressWarnings("unchecked")
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E ee = (E) e;
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ex = ee;
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}
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try {
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@SuppressWarnings("unchecked")
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T[] elements = (T[]) ofClassOfInstance(clazz).method(privateMethodName, boolean.class).invoke(clazz, false);
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for (T element : elements) {
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if (elementChecker.test(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 = ofClassOfInstance(clazz).method("getReflectionFactory").invoke(clazz);
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@SuppressWarnings("unchecked")
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T copiedElement = (T) ofClassOfInstance(reflectionFactoryOfClazz)
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.method(copyMethodName, element.getClass())
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.invoke(reflectionFactoryOfClazz, element);
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el = copiedElement;
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break;
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}
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}
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} catch (ReflectiveOperationException e) {
|
||||
if (ex != null)
|
||||
ex.addSuppressed(e);
|
||||
}
|
||||
|
||||
|
||||
if (el == null)
|
||||
throw ex;
|
||||
|
||||
setAccessible.accept(el);
|
||||
|
||||
return el;
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
private static Cache<Class<?>, List<Class<?>>> subClassesLists = CacheBuilder.newBuilder()
|
||||
|
||||
private static Cache<Class<?>, List<Class<?>>> subClassesLists = CacheBuilder.newBuilder()
|
||||
.expireAfterAccess(10, TimeUnit.MINUTES)
|
||||
.build();
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue