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Convert ClassFactory.java to kotlin (#1469)
Co-authored-by: Spencer Griffin <sgriffin@ancestry.com>
This commit is contained in:
Spencer Griffin
GitHub
@@ -1,147 +0,0 @@
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/*
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* Copyright (C) 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.squareup.moshi;
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import com.squareup.moshi.internal.Util;
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import java.io.ObjectInputStream;
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import java.io.ObjectStreamClass;
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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.InvocationTargetException;
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import java.lang.reflect.Method;
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/**
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* Magic that creates instances of arbitrary concrete classes. Derived from Gson's UnsafeAllocator
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* and ConstructorConstructor classes.
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*
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* @author Joel Leitch
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* @author Jesse Wilson
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*/
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abstract class ClassFactory<T> {
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abstract T newInstance()
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throws InvocationTargetException, IllegalAccessException, InstantiationException;
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public static <T> ClassFactory<T> get(final Class<?> rawType) {
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// Try to find a no-args constructor. May be any visibility including private.
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try {
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final Constructor<?> constructor = rawType.getDeclaredConstructor();
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constructor.setAccessible(true);
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return new ClassFactory<T>() {
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@SuppressWarnings("unchecked") // T is the same raw type as is requested
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@Override
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public T newInstance()
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throws IllegalAccessException, InvocationTargetException, InstantiationException {
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Object[] args = null;
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return (T) constructor.newInstance(args);
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}
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@Override
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public String toString() {
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return rawType.getName();
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}
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};
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} catch (NoSuchMethodException ignored) {
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// No no-args constructor. Fall back to something more magical...
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}
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// Try the JVM's Unsafe mechanism.
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// public class Unsafe {
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// public Object allocateInstance(Class<?> type);
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// }
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try {
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Class<?> unsafeClass = Class.forName("sun.misc.Unsafe");
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Field f = unsafeClass.getDeclaredField("theUnsafe");
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f.setAccessible(true);
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final Object unsafe = f.get(null);
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final Method allocateInstance = unsafeClass.getMethod("allocateInstance", Class.class);
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return new ClassFactory<T>() {
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@SuppressWarnings("unchecked")
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@Override
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public T newInstance() throws InvocationTargetException, IllegalAccessException {
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return (T) allocateInstance.invoke(unsafe, rawType);
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}
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@Override
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public String toString() {
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return rawType.getName();
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}
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};
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} catch (IllegalAccessException e) {
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throw new AssertionError();
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} catch (ClassNotFoundException | NoSuchMethodException | NoSuchFieldException ignored) {
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// Not the expected version of the Oracle Java library!
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}
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// Try (post-Gingerbread) Dalvik/libcore's ObjectStreamClass mechanism.
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// public class ObjectStreamClass {
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// private static native int getConstructorId(Class<?> c);
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// private static native Object newInstance(Class<?> instantiationClass, int methodId);
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// }
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try {
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Method getConstructorId =
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ObjectStreamClass.class.getDeclaredMethod("getConstructorId", Class.class);
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getConstructorId.setAccessible(true);
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final int constructorId = (Integer) getConstructorId.invoke(null, Object.class);
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final Method newInstance =
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ObjectStreamClass.class.getDeclaredMethod("newInstance", Class.class, int.class);
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newInstance.setAccessible(true);
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return new ClassFactory<T>() {
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@SuppressWarnings("unchecked")
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@Override
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public T newInstance() throws InvocationTargetException, IllegalAccessException {
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return (T) newInstance.invoke(null, rawType, constructorId);
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}
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@Override
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public String toString() {
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return rawType.getName();
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}
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};
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} catch (IllegalAccessException e) {
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throw new AssertionError();
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} catch (InvocationTargetException e) {
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throw Util.rethrowCause(e);
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} catch (NoSuchMethodException ignored) {
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// Not the expected version of Dalvik/libcore!
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}
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// Try (pre-Gingerbread) Dalvik/libcore's ObjectInputStream mechanism.
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// public class ObjectInputStream {
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// private static native Object newInstance(
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// Class<?> instantiationClass, Class<?> constructorClass);
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// }
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try {
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final Method newInstance =
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ObjectInputStream.class.getDeclaredMethod("newInstance", Class.class, Class.class);
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newInstance.setAccessible(true);
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return new ClassFactory<T>() {
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@SuppressWarnings("unchecked")
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@Override
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public T newInstance() throws InvocationTargetException, IllegalAccessException {
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return (T) newInstance.invoke(null, rawType, Object.class);
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}
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@Override
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public String toString() {
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return rawType.getName();
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}
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};
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} catch (Exception ignored) {
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}
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throw new IllegalArgumentException("cannot construct instances of " + rawType.getName());
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}
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}
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130
moshi/src/main/java/com/squareup/moshi/ClassFactory.kt
Normal file
130
moshi/src/main/java/com/squareup/moshi/ClassFactory.kt
Normal file
@@ -0,0 +1,130 @@
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/*
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* Copyright (C) 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.squareup.moshi
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import com.squareup.moshi.internal.rethrowCause
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import java.io.ObjectInputStream
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import java.io.ObjectStreamClass
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import java.lang.reflect.InvocationTargetException
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import kotlin.Throws
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/**
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* Magic that creates instances of arbitrary concrete classes. Derived from Gson's UnsafeAllocator
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* and ConstructorConstructor classes.
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*
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* @author Joel Leitch
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* @author Jesse Wilson
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*/
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internal abstract class ClassFactory<T> {
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@Throws(InvocationTargetException::class, IllegalAccessException::class, InstantiationException::class)
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abstract fun newInstance(): T
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companion object {
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@JvmStatic
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fun <T> get(rawType: Class<*>): ClassFactory<T> {
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// Try to find a no-args constructor. May be any visibility including private.
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try {
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val constructor = rawType.getDeclaredConstructor()
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constructor.isAccessible = true
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return object : ClassFactory<T>() {
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@Suppress("UNCHECKED_CAST")
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override fun newInstance() = constructor.newInstance() as T
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override fun toString() = rawType.name
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}
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} catch (ignored: NoSuchMethodException) {
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// No no-args constructor. Fall back to something more magical...
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}
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// Try the JVM's Unsafe mechanism.
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// public class Unsafe {
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// public Object allocateInstance(Class<?> type);
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// }
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try {
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val unsafeClass = Class.forName("sun.misc.Unsafe")
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val unsafeField = unsafeClass.getDeclaredField("theUnsafe")
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unsafeField.isAccessible = true
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val unsafe = unsafeField[null]
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val allocateInstance = unsafeClass.getMethod("allocateInstance", Class::class.java)
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return object : ClassFactory<T>() {
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@Suppress("UNCHECKED_CAST")
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override fun newInstance() = allocateInstance.invoke(unsafe, rawType) as T
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override fun toString() = rawType.name
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}
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} catch (e: IllegalAccessException) {
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throw AssertionError()
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} catch (ignored: ClassNotFoundException) {
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// Not the expected version of the Oracle Java library!
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} catch (ignored: NoSuchMethodException) {
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// Not the expected version of the Oracle Java library!
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} catch (ignored: NoSuchFieldException) {
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// Not the expected version of the Oracle Java library!
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}
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// Try (post-Gingerbread) Dalvik/libcore's ObjectStreamClass mechanism.
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// public class ObjectStreamClass {
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// private static native int getConstructorId(Class<?> c);
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// private static native Object newInstance(Class<?> instantiationClass, int methodId);
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// }
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try {
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val getConstructorId =
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ObjectStreamClass::class.java.getDeclaredMethod("getConstructorId", Class::class.java)
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getConstructorId.isAccessible = true
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val constructorId = getConstructorId.invoke(null, Any::class.java) as Int
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val newInstance = ObjectStreamClass::class.java.getDeclaredMethod(
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"newInstance",
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Class::class.java,
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Int::class.javaPrimitiveType
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)
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newInstance.isAccessible = true
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return object : ClassFactory<T>() {
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@Suppress("UNCHECKED_CAST")
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override fun newInstance() = newInstance.invoke(null, rawType, constructorId) as T
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override fun toString() = rawType.name
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}
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} catch (e: IllegalAccessException) {
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throw AssertionError()
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} catch (e: InvocationTargetException) {
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throw e.rethrowCause()
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} catch (ignored: NoSuchMethodException) {
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// Not the expected version of Dalvik/libcore!
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}
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// Try (pre-Gingerbread) Dalvik/libcore's ObjectInputStream mechanism.
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// public class ObjectInputStream {
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// private static native Object newInstance(
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// Class<?> instantiationClass, Class<?> constructorClass);
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// }
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try {
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val newInstance =
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ObjectInputStream::class.java.getDeclaredMethod("newInstance", Class::class.java, Class::class.java)
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newInstance.isAccessible = true
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return object : ClassFactory<T>() {
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@Suppress("UNCHECKED_CAST")
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override fun newInstance() = newInstance.invoke(null, rawType, Any::class.java) as T
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override fun toString() = rawType.name
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}
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} catch (ignored: Exception) {
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}
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throw IllegalArgumentException("cannot construct instances of ${rawType.name}")
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}
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}
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}
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