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java.lang.ClassCache Maven / Gradle / Ivy
/*
* Copyright (C) 2012 RoboVM AB
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.lang;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.robovm.rt.ReflectionAccess;
/**
*
* @version $Id$
*/
final class ClassCache {
static final ReflectionAccess R = loadReflectionAccess();
private static final Class[] EMPTY_CLASSES = new Class[0];
private static final Constructor[] EMPTY_CONSTRUCTORS = new Constructor[0];
private static final Method[] EMPTY_METHODS = new Method[0];
private static final Field[] EMPTY_FIELDS = new Field[0];
private static final Annotation[] EMPTY_ANNOTATIONS = new Annotation[0];
private final Class clazz;
private String name;
private Class[] declaredClasses;
private Class[] declaredPublicClasses;
private Class[] allPublicClasses;
private Field[] declaredFields;
private Field[] declaredPublicFields;
private Field[] allPublicFields;
private Constructor[] declaredConstructors;
private Constructor[] declaredPublicConstructors;
private Method[] declaredMethods;
private Method[] declaredPublicMethods;
private Method[] allPublicMethods;
private Annotation[] declaredAnnotations;
private Annotation[] allAnnotations;
ClassCache(Class clazz) {
this.clazz = clazz;
}
String getName() {
if (name == null) {
String n = clazz.getName0();
if (clazz.isPrimitive()) {
switch (n.charAt(0)) {
case 'Z':
name = "boolean";
break;
case 'B':
name = "byte";
break;
case 'S':
name = "short";
break;
case 'C':
name = "char";
break;
case 'I':
name = "int";
break;
case 'J':
name = "long";
break;
case 'F':
name = "float";
break;
case 'D':
name = "double";
break;
case 'V':
name = "void";
break;
}
} else {
name = n.replace('/', '.');
}
}
return name;
}
Class[] getDeclaredClasses(boolean copy) {
if (declaredClasses == null) {
declaredClasses = clazz.getDeclaredClasses0(false);
if (declaredClasses == null) {
declaredClasses = EMPTY_CLASSES;
}
}
return copy ? declaredClasses.clone() : declaredClasses;
}
Class[] getDeclaredPublicClasses(boolean copy) {
if (declaredPublicClasses == null) {
declaredPublicClasses = clazz.getDeclaredClasses0(true);
if (declaredPublicClasses == null) {
declaredPublicClasses = EMPTY_CLASSES;
}
}
return copy ? declaredPublicClasses.clone() : declaredPublicClasses;
}
Class[] getDeclaredClasses(boolean copy, boolean publicOnly) {
if (publicOnly) {
return getDeclaredPublicClasses(copy);
}
return getDeclaredClasses(copy);
}
Field[] getDeclaredFields(boolean copy) {
if (declaredFields == null) {
declaredFields = clazz.getDeclaredFields0(false);
if (declaredFields == null) {
declaredFields = EMPTY_FIELDS;
}
}
return copy ? R.clone(declaredFields) : declaredFields;
}
Field[] getDeclaredPublicFields(boolean copy) {
if (declaredPublicFields == null) {
declaredPublicFields = clazz.getDeclaredFields0(true);
if (declaredPublicFields == null) {
declaredPublicFields = EMPTY_FIELDS;
}
}
return copy ? R.clone(declaredPublicFields) : declaredPublicFields;
}
Field[] getDeclaredFields(boolean copy, boolean publicOnly) {
if (publicOnly) {
return getDeclaredPublicFields(copy);
}
return getDeclaredFields(copy);
}
Constructor[] getDeclaredConstructors(boolean copy) {
if (declaredConstructors == null) {
declaredConstructors = clazz.getDeclaredConstructors0(false);
if (declaredConstructors == null) {
declaredConstructors = EMPTY_CONSTRUCTORS;
}
}
return copy ? R.clone(declaredConstructors) : declaredConstructors;
}
Constructor[] getDeclaredPublicConstructors(boolean copy) {
if (declaredPublicConstructors == null) {
declaredPublicConstructors = clazz.getDeclaredConstructors0(true);
if (declaredPublicConstructors == null) {
declaredPublicConstructors = EMPTY_CONSTRUCTORS;
}
}
return copy ? R.clone(declaredPublicConstructors) : declaredPublicConstructors;
}
Method[] getDeclaredMethods(boolean copy) {
if (declaredMethods == null) {
declaredMethods = clazz.getDeclaredMethods0(false);
if (declaredMethods == null) {
declaredMethods = EMPTY_METHODS;
}
}
return copy ? R.clone(declaredMethods) : declaredMethods;
}
Method[] getDeclaredPublicMethods(boolean copy) {
if (declaredPublicMethods == null) {
declaredPublicMethods = clazz.getDeclaredMethods0(true);
if (declaredPublicMethods == null) {
declaredPublicMethods = EMPTY_METHODS;
}
}
return copy ? R.clone(declaredPublicMethods) : declaredPublicMethods;
}
Method[] getDeclaredMethods(boolean copy, boolean publicOnly) {
if (publicOnly) {
return getDeclaredPublicMethods(copy);
}
return getDeclaredMethods(copy);
}
Annotation[] getDeclaredAnnotations(boolean copy) {
if (declaredAnnotations == null) {
declaredAnnotations = clazz.getDeclaredAnnotations0();
if (declaredAnnotations == null) {
declaredAnnotations = EMPTY_ANNOTATIONS;
}
}
return copy ? declaredAnnotations.clone() : declaredAnnotations;
}
Class[] getClasses(boolean copy) {
if (this.allPublicClasses == null) {
List> l = buildClassesList(new ArrayList>(), new HashSet(), true);
this.allPublicClasses = l.toArray(new Class[l.size()]);
}
return copy ? this.allPublicClasses.clone() : this.allPublicClasses;
}
Field[] getFields(boolean copy) {
if (this.allPublicFields == null) {
List l = buildFieldsList(new ArrayList(), new HashSet(), true);
this.allPublicFields = l.toArray(new Field[l.size()]);
}
return copy ? R.clone(this.allPublicFields) : this.allPublicFields;
}
Method[] getMethods(boolean copy) {
if (this.allPublicMethods == null) {
List l = buildMethodsList(new ArrayList(), new HashSet(), true);
this.allPublicMethods = l.toArray(new Method[l.size()]);
}
return copy ? R.clone(this.allPublicMethods) : this.allPublicMethods;
}
Annotation[] getAnnotations(boolean copy) {
if (allAnnotations == null) {
allAnnotations = clazz.getAnnotations0();
if (allAnnotations == null) {
allAnnotations = EMPTY_ANNOTATIONS;
}
}
return copy ? allAnnotations.clone() : allAnnotations;
}
@SuppressWarnings("unchecked")
Constructor getDeclaredConstructor(boolean copy, Class... parameterTypes) throws java.lang.NoSuchMethodException {
Constructor c = findConstructor(getDeclaredConstructors(false), parameterTypes);
return copy ? (Constructor) R.clone(c) : c;
}
@SuppressWarnings("unchecked")
Constructor getConstructor(boolean copy, Class... parameterTypes) throws java.lang.NoSuchMethodException {
Constructor c = findConstructor(getDeclaredPublicConstructors(false), parameterTypes);
return copy ? (Constructor) R.clone(c) : c;
}
Field getDeclaredField(boolean copy, String name) throws NoSuchFieldException {
Field f = findField(getDeclaredFields(false), name);
return copy ? R.clone(f) : f;
}
Field getField(boolean copy, String name) throws NoSuchFieldException {
Field f = findField(getFields(false), name);
return copy ? R.clone(f) : f;
}
Method getDeclaredMethod(boolean copy, String name, Class... parameterTypes) throws NoSuchMethodException {
Method m = findMethod(getDeclaredMethods(false), name, parameterTypes);
return copy ? R.clone(m) : m;
}
Method getMethod(boolean copy, String name, Class... parameterTypes) throws NoSuchMethodException {
Method m = findMethod(getMethods(false), name, parameterTypes);
return copy ? R.clone(m) : m;
}
private List> buildClassesList(List> result, Set seen, boolean publicOnly) {
for (Class c = clazz; c != null; c = c.getSuperclass()) {
for (Class f : c.getClassCache().getDeclaredClasses(false, publicOnly)) {
String s = f.toString();
if (!seen.contains(s)) {
result.add(f);
seen.add(s);
}
}
}
return result;
}
private List buildFieldsList(List result, Set seen, boolean publicOnly) {
for (Class c = clazz; c != null; c = c.getSuperclass()) {
for (Field f : c.getClassCache().getDeclaredFields(false, publicOnly)) {
String s = f.toString();
if (!seen.contains(s)) {
result.add(f);
seen.add(s);
}
}
for (Class intf : c.getInterfaces()) {
intf.getClassCache().buildFieldsList(result, seen, publicOnly);
}
}
return result;
}
private List buildMethodsList(List result, Set seen, boolean publicOnly) {
for (Class c = clazz; c != null; c = c.getSuperclass()) {
for (Method m : c.getClassCache().getDeclaredMethods(false, publicOnly)) {
MethodHashKey key = new MethodHashKey(m);
if (!seen.contains(key)) {
result.add(m);
seen.add(key);
}
}
}
for (Class c = clazz; c != null; c = c.getSuperclass()) {
for (Class intf : c.getInterfaces()) {
intf.getClassCache().buildMethodsList(result, seen, publicOnly);
}
}
return result;
}
@SuppressWarnings("unchecked")
private Constructor findConstructor(Constructor[] candidates, Class... parameterTypes)
throws NoSuchMethodException, SecurityException {
for (Constructor c : candidates) {
if (R.matchParameterTypes(c, parameterTypes)) {
return (Constructor) c;
}
}
throw new NoSuchMethodException(clazz.getName() + '('
+ parameterTypesToString(parameterTypes) + ')');
}
private Method findMethod(Method[] candidates, String name, Class... parameterTypes)
throws NoSuchMethodException {
Method firstMatch = null;
List allMatches = null;
for (Method m : candidates) {
if (name.equals(m.getName()) && R.matchParameterTypes(m, parameterTypes)) {
if (firstMatch == null) {
firstMatch = m;
} else {
if (allMatches == null) {
allMatches = new ArrayList();
allMatches.add(firstMatch);
}
allMatches.add(m);
}
}
}
if (firstMatch == null) {
throw new NoSuchMethodException(clazz.getName() + "." + name + '('
+ parameterTypesToString(parameterTypes) + ')');
}
if (allMatches == null) {
return firstMatch;
}
// There are multiple methods with the same name and parameter types. The RI's docs says
// pick the method with the most specific return type or pick an arbitrary if there are
// no such methods. Dalvik just filters out synthetic methods and then picks an arbitrary
// one (if the source language is Java there should only be one non-synthetic match).
Method result = null;
for (Method m : allMatches) {
if (!m.isSynthetic()) {
return m;
}
result = m;
}
return result;
}
private Field findField(Field[] candidates, String name) throws NoSuchFieldException {
for (Field f : candidates) {
if (name.equals(f.getName())) {
return f;
}
}
throw new NoSuchFieldException(name);
}
private static void appendTypeName(StringBuilder out, Class c) {
if (c == null) {
out.append("null");
} else {
int dimensions = 0;
while (c.isArray()) {
c = c.getComponentType();
dimensions++;
}
out.append(c.getName());
for (int d = 0; d < dimensions; d++) {
out.append("[]");
}
}
}
private static String parameterTypesToString(Class[] parameterTypes) {
if (parameterTypes != null && parameterTypes.length > 0) {
StringBuilder sb = new StringBuilder();
appendTypeName(sb, parameterTypes[0]);
for (int i = 1; i < parameterTypes.length; i++) {
sb.append(',');
appendTypeName(sb, parameterTypes[i]);
}
return sb.toString();
}
return "";
}
private static final native ReflectionAccess loadReflectionAccess();
private static final class MethodHashKey {
private final Method m;
MethodHashKey(Method m) {
this.m = m;
}
@Override
public int hashCode() {
return m.getName().hashCode();
}
@Override
public boolean equals(Object o) {
Method m1 = m;
Method m2 = ((MethodHashKey) o).m;
return R.equals(m1, m2);
}
}
}
