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JavaClass.java
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JavaClass.java
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/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common Public
* License Version 1.0 (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.eclipse.org/legal/cpl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
* Copyright (C) 2002-2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
* Copyright (C) 2004-2005 Thomas E Enebo <enebo@acm.org>
* Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
* Copyright (C) 2004 David Corbin <dcorbin@users.sourceforge.net>
* Copyright (C) 2005 Charles O Nutter <headius@headius.com>
* Copyright (C) 2006 Kresten Krab Thorup <krab@gnu.org>
* Copyright (C) 2007 Miguel Covarrubias <mlcovarrubias@gmail.com>
* Copyright (C) 2007 William N Dortch <bill.dortch@gmail.com>
* Copyright (C) 2011 David Pollak <feeder.of.the.bears@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the CPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the CPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.javasupport;
import org.jruby.java.invokers.StaticFieldGetter;
import org.jruby.java.invokers.StaticMethodInvoker;
import org.jruby.java.invokers.SingletonMethodInvoker;
import org.jruby.java.invokers.InstanceFieldGetter;
import org.jruby.java.invokers.InstanceFieldSetter;
import org.jruby.java.invokers.InstanceMethodInvoker;
import org.jruby.java.invokers.StaticFieldSetter;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ReflectPermission;
import java.security.AccessController;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.concurrent.locks.ReentrantLock;
import org.jruby.Ruby;
import org.jruby.RubyArray;
import org.jruby.RubyBoolean;
import org.jruby.RubyClass;
import org.jruby.RubyFixnum;
import org.jruby.RubyInstanceConfig;
import org.jruby.RubyInteger;
import org.jruby.RubyModule;
import org.jruby.RubyString;
import org.jruby.anno.JRubyMethod;
import org.jruby.anno.JRubyClass;
import org.jruby.common.IRubyWarnings.ID;
import org.jruby.exceptions.RaiseException;
import org.jruby.internal.runtime.methods.DynamicMethod;
import org.jruby.internal.runtime.methods.JavaMethod.JavaMethodZero;
import org.jruby.java.addons.ArrayJavaAddons;
import org.jruby.java.proxies.ArrayJavaProxy;
import org.jruby.java.invokers.ConstructorInvoker;
import org.jruby.java.proxies.ConcreteJavaProxy;
import org.jruby.javasupport.util.RuntimeHelpers;
import org.jruby.runtime.Arity;
import org.jruby.runtime.Block;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.Visibility;
import static org.jruby.runtime.Visibility.*;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.runtime.callback.Callback;
import org.jruby.util.ByteList;
import org.jruby.util.IdUtil;
import org.jruby.util.SafePropertyAccessor;
@JRubyClass(name="Java::JavaClass", parent="Java::JavaObject")
public class JavaClass extends JavaObject {
public static final String METHOD_MANGLE = "__method";
public static final boolean DEBUG_SCALA = false;
public static final boolean CAN_SET_ACCESSIBLE;
static {
boolean canSetAccessible = false;
if (RubyInstanceConfig.CAN_SET_ACCESSIBLE) {
try {
AccessController.checkPermission(new ReflectPermission("suppressAccessChecks"));
canSetAccessible = true;
} catch (Throwable t) {
// added this so if things are weird in the future we can debug without
// spinning a new binary
if (SafePropertyAccessor.getBoolean("jruby.ji.logCanSetAccessible")) {
t.printStackTrace();
}
// assume any exception means we can't suppress access checks
canSetAccessible = false;
}
}
CAN_SET_ACCESSIBLE = canSetAccessible;
}
private void handleScalaSingletons(Class<?> javaClass, InitializerState state) {
// check for Scala companion object
try {
ClassLoader cl = javaClass.getClassLoader();
if (cl == null) {
//this is a core class, bail
return;
}
Class<?> companionClass = cl.loadClass(javaClass.getName() + "$");
Field field = companionClass.getField("MODULE$");
Object singleton = field.get(null);
if (singleton != null) {
Method[] sMethods = getMethods(companionClass);
for (int j = sMethods.length - 1; j >= 0; j--) {
Method method = sMethods[j];
String name = method.getName();
if (DEBUG_SCALA) {
System.out.println("Companion object method " + name + " for " + companionClass);
}
if (name.indexOf("$") >= 0) {
name = fixScalaNames(name);
}
if (!Modifier.isStatic(method.getModifiers())) {
AssignedName assignedName = state.staticNames.get(name);
// For JRUBY-4505, restore __method methods for reserved names
if (INSTANCE_RESERVED_NAMES.containsKey(method.getName())) {
if (DEBUG_SCALA) {
System.out.println("in reserved " + name);
}
installSingletonMethods(state.staticCallbacks, javaClass, singleton, method, name + METHOD_MANGLE);
continue;
}
if (assignedName == null) {
state.staticNames.put(name, new AssignedName(name, Priority.METHOD));
if (DEBUG_SCALA) {
System.out.println("Assigned name is null");
}
} else {
if (Priority.METHOD.lessImportantThan(assignedName)) {
if (DEBUG_SCALA) {
System.out.println("Less important");
}
continue;
}
if (!Priority.METHOD.asImportantAs(assignedName)) {
state.staticCallbacks.remove(name);
state.staticCallbacks.remove(name + '=');
state.staticNames.put(name, new AssignedName(name, Priority.METHOD));
}
}
if (DEBUG_SCALA) {
System.out.println("Installing " + name + " " + method + " " + singleton);
}
installSingletonMethods(state.staticCallbacks, javaClass, singleton, method, name);
} else {
if (DEBUG_SCALA) {
System.out.println("Method " + method + " is sadly static");
}
}
}
}
// ignore... there's no companion object
} catch (ClassNotFoundException e) {
} catch (NoSuchFieldException e) {
} catch (IllegalAccessException e) {
}
}
/**
* Assigned names only override based priority of an assigned type, the type must be less than
* or equal to the assigned type. For example, field name (FIELD) in a subclass will override
* an alias (ALIAS) in a superclass, but not a method (METHOD).
*/
private enum Priority {
RESERVED(0), METHOD(1), FIELD(2), PROTECTED_METHOD(3),
WEAKLY_RESERVED(4), ALIAS(5), PROTECTED_FIELD(6);
private int value;
Priority(int value) {
this.value = value;
}
public boolean asImportantAs(AssignedName other) {
return other != null && other.type.value == value;
}
public boolean lessImportantThan(AssignedName other) {
return other != null && other.type.value < value;
}
public boolean moreImportantThan(AssignedName other) {
return other == null || other.type.value > value;
}
}
private static class AssignedName {
String name;
Priority type;
AssignedName () {}
AssignedName(String name, Priority type) {
this.name = name;
this.type = type;
}
}
// TODO: other reserved names?
private static final Map<String, AssignedName> RESERVED_NAMES = new HashMap<String, AssignedName>();
static {
RESERVED_NAMES.put("__id__", new AssignedName("__id__", Priority.RESERVED));
RESERVED_NAMES.put("__send__", new AssignedName("__send__", Priority.RESERVED));
// JRUBY-5132: java.awt.Component.instance_of?() expects 2 args
RESERVED_NAMES.put("instance_of?", new AssignedName("instance_of?", Priority.RESERVED));
}
private static final Map<String, AssignedName> STATIC_RESERVED_NAMES = new HashMap<String, AssignedName>(RESERVED_NAMES);
static {
STATIC_RESERVED_NAMES.put("new", new AssignedName("new", Priority.RESERVED));
}
private static final Map<String, AssignedName> INSTANCE_RESERVED_NAMES = new HashMap<String, AssignedName>(RESERVED_NAMES);
static {
// only possible for "getClass" to be an instance method in Java
INSTANCE_RESERVED_NAMES.put("class", new AssignedName("class", Priority.RESERVED));
// "initialize" has meaning only for an instance (as opposed to a class)
INSTANCE_RESERVED_NAMES.put("initialize", new AssignedName("initialize", Priority.RESERVED));
}
private static abstract class NamedInstaller {
static final int STATIC_FIELD = 1;
static final int STATIC_METHOD = 2;
static final int INSTANCE_FIELD = 3;
static final int INSTANCE_METHOD = 4;
static final int CONSTRUCTOR = 5;
String name;
int type;
Visibility visibility = Visibility.PUBLIC;
NamedInstaller () {}
NamedInstaller (String name, int type) {
this.name = name;
this.type = type;
}
abstract void install(RubyModule proxy);
// small hack to save a cast later on
boolean hasLocalMethod() {
return true;
}
boolean isPublic() {
return visibility == Visibility.PUBLIC;
}
boolean isProtected() {
return visibility == Visibility.PROTECTED;
}
}
private static abstract class FieldInstaller extends NamedInstaller {
Field field;
FieldInstaller(){}
FieldInstaller(String name, int type, Field field) {
super(name,type);
this.field = field;
}
}
private static class StaticFieldGetterInstaller extends FieldInstaller {
StaticFieldGetterInstaller(){}
StaticFieldGetterInstaller(String name, Field field) {
super(name,STATIC_FIELD,field);
}
void install(RubyModule proxy) {
if (Modifier.isPublic(field.getModifiers())) {
proxy.getSingletonClass().addMethod(name, new StaticFieldGetter(name, proxy, field));
}
}
}
private static class StaticFieldSetterInstaller extends FieldInstaller {
StaticFieldSetterInstaller(){}
StaticFieldSetterInstaller(String name, Field field) {
super(name,STATIC_FIELD,field);
}
void install(RubyModule proxy) {
if (Modifier.isPublic(field.getModifiers())) {
proxy.getSingletonClass().addMethod(name, new StaticFieldSetter(name, proxy, field));
}
}
}
private static class InstanceFieldGetterInstaller extends FieldInstaller {
InstanceFieldGetterInstaller(){}
InstanceFieldGetterInstaller(String name, Field field) {
super(name,INSTANCE_FIELD,field);
}
void install(RubyModule proxy) {
if (Modifier.isPublic(field.getModifiers())) {
proxy.addMethod(name, new InstanceFieldGetter(name, proxy, field));
}
}
}
private static class InstanceFieldSetterInstaller extends FieldInstaller {
InstanceFieldSetterInstaller(){}
InstanceFieldSetterInstaller(String name, Field field) {
super(name,INSTANCE_FIELD,field);
}
void install(RubyModule proxy) {
if (Modifier.isPublic(field.getModifiers())) {
proxy.addMethod(name, new InstanceFieldSetter(name, proxy, field));
}
}
}
private static abstract class MethodInstaller extends NamedInstaller {
private boolean haveLocalMethod;
protected List<Method> methods;
protected List<String> aliases;
MethodInstaller(){}
MethodInstaller(String name, int type) {
super(name,type);
}
// called only by initializing thread; no synchronization required
void addMethod(Method method, Class<?> javaClass) {
if (methods == null) {
methods = new ArrayList<Method>(4);
}
methods.add(method);
haveLocalMethod |= javaClass == method.getDeclaringClass() ||
method.getDeclaringClass().isInterface();
}
// called only by initializing thread; no synchronization required
void addAlias(String alias) {
if (aliases == null) {
aliases = new ArrayList<String>(4);
}
if (!aliases.contains(alias)) {
aliases.add(alias);
}
}
// modified only by addMethod; no synchronization required
@Override
boolean hasLocalMethod () {
return haveLocalMethod;
}
}
private static class ConstructorInvokerInstaller extends MethodInstaller {
private boolean haveLocalConstructor;
protected List<Constructor> constructors;
ConstructorInvokerInstaller(String name) {
super(name,STATIC_METHOD);
}
// called only by initializing thread; no synchronization required
void addConstructor(Constructor ctor, Class<?> javaClass) {
if (constructors == null) {
constructors = new ArrayList<Constructor>(4);
}
if (!Ruby.isSecurityRestricted()) {
try {
ctor.setAccessible(true);
} catch(SecurityException e) {}
}
constructors.add(ctor);
haveLocalConstructor |= javaClass == ctor.getDeclaringClass();
}
void install(final RubyModule proxy) {
if (haveLocalConstructor) {
DynamicMethod method = new ConstructorInvoker(proxy, constructors);
proxy.addMethod(name, method);
} else {
// if there's no constructor, we must prevent construction
proxy.addMethod(name, new org.jruby.internal.runtime.methods.JavaMethod(proxy, PUBLIC) {
@Override
public IRubyObject call(ThreadContext context, IRubyObject self, RubyModule clazz, String name, IRubyObject[] args, Block block) {
throw context.getRuntime().newTypeError("no public constructors for " + clazz);
}
});
}
}
}
private static class StaticMethodInvokerInstaller extends MethodInstaller {
StaticMethodInvokerInstaller(String name) {
super(name,STATIC_METHOD);
}
void install(RubyModule proxy) {
if (hasLocalMethod()) {
RubyClass singleton = proxy.getSingletonClass();
DynamicMethod method = new StaticMethodInvoker(singleton, methods);
singleton.addMethod(name, method);
if (aliases != null && isPublic() ) {
singleton.defineAliases(aliases, this.name);
aliases = null;
}
}
}
}
private static class SingletonMethodInvokerInstaller extends StaticMethodInvokerInstaller {
private Object singleton;
SingletonMethodInvokerInstaller(String name, Object singleton) {
super(name);
this.singleton = singleton;
}
void install(RubyModule proxy) {
if (hasLocalMethod()) {
RubyClass rubySingleton = proxy.getSingletonClass();
DynamicMethod method = new SingletonMethodInvoker(this.singleton, rubySingleton, methods);
rubySingleton.addMethod(name, method);
if (aliases != null && isPublic()) {
rubySingleton.defineAliases(aliases, this.name);
aliases = null;
}
}
}
}
private static class InstanceMethodInvokerInstaller extends MethodInstaller {
InstanceMethodInvokerInstaller(String name) {
super(name,INSTANCE_METHOD);
}
void install(RubyModule proxy) {
if (hasLocalMethod()) {
DynamicMethod method = new InstanceMethodInvoker(proxy, methods);
proxy.addMethod(name, method);
if (aliases != null && isPublic()) {
proxy.defineAliases(aliases, this.name);
aliases = null;
}
}
}
}
private static class ConstantField {
static final int CONSTANT = Modifier.FINAL | Modifier.PUBLIC | Modifier.STATIC;
final Field field;
ConstantField(Field field) {
this.field = field;
}
void install(final RubyModule proxy) {
if (proxy.getConstantAt(field.getName()) == null) {
// TODO: catch exception if constant is already set by other
// thread
try {
proxy.setConstant(field.getName(), JavaUtil.convertJavaToUsableRubyObject(proxy.getRuntime(), field.get(null)));
} catch (IllegalAccessException iae) {
// if we can't read it, we don't set it
}
}
}
static boolean isConstant(final Field field) {
return (field.getModifiers() & CONSTANT) == CONSTANT &&
Character.isUpperCase(field.getName().charAt(0));
}
}
private final RubyModule JAVA_UTILITIES = getRuntime().getJavaSupport().getJavaUtilitiesModule();
private Map<String, AssignedName> staticAssignedNames;
private Map<String, AssignedName> instanceAssignedNames;
private Map<String, NamedInstaller> staticInstallers;
private Map<String, NamedInstaller> instanceInstallers;
private ConstructorInvokerInstaller constructorInstaller;
private List<ConstantField> constantFields;
// caching constructors, as they're accessed for each new instance
private volatile RubyArray constructors;
private volatile ArrayList<IRubyObject> proxyExtenders;
// proxy module for interfaces
private volatile RubyModule proxyModule;
// proxy class for concrete classes. also used for
// "concrete" interfaces, which is why we have two fields
private volatile RubyClass proxyClass;
// readable only by thread building proxy, so don't need to be
// volatile. used to handle recursive calls to getProxyClass/Module
// while proxy is being constructed (usually when a constant
// defined by a class is of the same type as that class).
private RubyModule unfinishedProxyModule;
private RubyClass unfinishedProxyClass;
private final ReentrantLock proxyLock = new ReentrantLock();
private final Initializer initializer;
public RubyModule getProxyModule() {
// allow proxy to be read without synchronization. if proxy
// is under construction, only the building thread can see it.
RubyModule proxy;
if ((proxy = proxyModule) != null) {
// proxy is complete, return it
return proxy;
} else if (proxyLock.isHeldByCurrentThread()) {
// proxy is under construction, building thread can
// safely read non-volatile value
return unfinishedProxyModule;
}
return null;
}
public RubyClass getProxyClass() {
// allow proxy to be read without synchronization. if proxy
// is under construction, only the building thread can see it.
RubyClass proxy;
if ((proxy = proxyClass) != null) {
// proxy is complete, return it
return proxy;
} else if (proxyLock.isHeldByCurrentThread()) {
// proxy is under construction, building thread can
// safely read non-volatile value
return unfinishedProxyClass;
}
return null;
}
public void lockProxy() {
proxyLock.lock();
}
public void unlockProxy() {
proxyLock.unlock();
}
private Map<String, AssignedName> getStaticAssignedNames() {
return staticAssignedNames;
}
private Map<String, AssignedName> getInstanceAssignedNames() {
return instanceAssignedNames;
}
private JavaClass(Ruby runtime, Class<?> javaClass) {
super(runtime, (RubyClass) runtime.getJavaSupport().getJavaClassClass(), javaClass);
if (javaClass.isInterface()) {
initializer = new InterfaceInitializer(javaClass);
} else if (!(javaClass.isArray() || javaClass.isPrimitive())) {
initializer = new ClassInitializer(javaClass);
} else {
initializer = DUMMY_INITIALIZER;
}
}
@Override
public boolean equals(Object other) {
return other instanceof JavaClass &&
this.getValue() == ((JavaClass)other).getValue();
}
@Override
public int hashCode() {
return javaClass().hashCode();
}
private interface Initializer {
public void initialize();
}
private class InterfaceInitializer implements Initializer {
private volatile boolean hasRun = false;
private final Class javaClass;
public InterfaceInitializer(Class<?> javaClass) {
this.javaClass = javaClass;
}
public synchronized void initialize() {
if (hasRun) return;
hasRun = true;
Map<String, AssignedName> staticNames = new HashMap<String, AssignedName>(STATIC_RESERVED_NAMES);
List<ConstantField> constants = new ArrayList<ConstantField>();
Map<String, NamedInstaller> staticCallbacks = new HashMap<String, NamedInstaller>();
Field[] fields = getDeclaredFields(javaClass);
for (int i = fields.length; --i >= 0; ) {
Field field = fields[i];
if (javaClass != field.getDeclaringClass()) continue;
if (ConstantField.isConstant(field)) constants.add(new ConstantField(field));
int modifiers = field.getModifiers();
if (Modifier.isStatic(modifiers)) addField(staticCallbacks, staticNames, field, Modifier.isFinal(modifiers), true);
}
// Now add all aliases for the static methods (fields) as appropriate
for (Map.Entry<String, NamedInstaller> entry : staticCallbacks.entrySet()) {
if (entry.getValue().type == NamedInstaller.STATIC_METHOD && entry.getValue().hasLocalMethod()) {
assignAliases((MethodInstaller)entry.getValue(), staticNames);
}
}
JavaClass.this.staticAssignedNames = staticNames;
JavaClass.this.staticInstallers = staticCallbacks;
JavaClass.this.constantFields = constants;
}
};
private class ClassInitializer implements Initializer {
private volatile boolean hasRun = false;
private final Class javaClass;
public ClassInitializer(Class<?> javaClass) {
this.javaClass = javaClass;
}
public synchronized void initialize() {
if (hasRun) return;
hasRun = true;
Class<?> superclass = javaClass.getSuperclass();
InitializerState state = new InitializerState(getRuntime(), superclass);
setupClassFields(javaClass, state);
setupClassMethods(javaClass, state);
setupClassConstructors(javaClass);
JavaClass.this.staticAssignedNames = Collections.unmodifiableMap(state.staticNames);
JavaClass.this.instanceAssignedNames = Collections.unmodifiableMap(state.instanceNames);
JavaClass.this.staticInstallers = Collections.unmodifiableMap(state.staticCallbacks);
JavaClass.this.instanceInstallers = Collections.unmodifiableMap(state.instanceCallbacks);
JavaClass.this.constantFields = Collections.unmodifiableList(state.constantFields);
}
}
private static class InitializerState {
public final Map<String, AssignedName> staticNames;
public final Map<String, AssignedName> instanceNames;
public final Map<String, NamedInstaller> staticCallbacks = new HashMap<String, NamedInstaller>();
public final Map<String, NamedInstaller> instanceCallbacks = new HashMap<String, NamedInstaller>();
public final List<ConstantField> constantFields = new ArrayList<ConstantField>();
public InitializerState(Ruby runtime, Class superclass) {
if (superclass == null) {
staticNames = new HashMap<String, AssignedName>();
instanceNames = new HashMap<String, AssignedName>();
} else {
JavaClass superJavaClass = get(runtime,superclass);
staticNames = new HashMap<String, AssignedName>(superJavaClass.getStaticAssignedNames());
instanceNames = new HashMap<String, AssignedName>(superJavaClass.getInstanceAssignedNames());
}
staticNames.putAll(STATIC_RESERVED_NAMES);
instanceNames.putAll(INSTANCE_RESERVED_NAMES);
}
}
private static final Initializer DUMMY_INITIALIZER = new Initializer() {
public synchronized void initialize() {
// anything useful we could do here?
}
};
public void setupProxy(final RubyClass proxy) {
initializer.initialize();
assert proxyLock.isHeldByCurrentThread();
proxy.defineFastMethod("__jsend!", __jsend_method);
final Class<?> javaClass = javaClass();
if (javaClass.isInterface()) {
setupInterfaceProxy(proxy);
return;
}
proxy.setReifiedClass(javaClass);
assert this.proxyClass == null;
this.unfinishedProxyClass = proxy;
if (javaClass.isArray() || javaClass.isPrimitive()) {
// see note below re: 2-field kludge
this.proxyClass = proxy;
this.proxyModule = proxy;
return;
}
installClassFields(proxy);
installClassMethods(proxy);
installClassConstructors(proxy);
installClassClasses(javaClass, proxy);
// FIXME: bit of a kludge here (non-interface classes assigned to both
// class and module fields). simplifies proxy extender code, will go away
// when JI is overhauled (and proxy extenders are deprecated).
this.proxyClass = proxy;
this.proxyModule = proxy;
applyProxyExtenders();
// TODO: we can probably release our references to the constantFields
// array and static/instance callback hashes at this point.
}
private static void assignAliases(MethodInstaller installer, Map<String, AssignedName> assignedNames) {
String name = installer.name;
String rubyCasedName = JavaUtil.getRubyCasedName(name);
addUnassignedAlias(rubyCasedName,assignedNames,installer);
String javaPropertyName = JavaUtil.getJavaPropertyName(name);
String rubyPropertyName = null;
for (Method method: installer.methods) {
Class<?>[] argTypes = method.getParameterTypes();
Class<?> resultType = method.getReturnType();
int argCount = argTypes.length;
// Add scala aliases for apply/update to roughly equivalent Ruby names
if (rubyCasedName.equals("apply")) {
addUnassignedAlias("[]", assignedNames, installer);
}
if (rubyCasedName.equals("update") && argCount == 2) {
addUnassignedAlias("[]=", assignedNames, installer);
}
// Scala aliases for $ method names
if (name.startsWith("$")) {
addUnassignedAlias(fixScalaNames(name), assignedNames, installer);
}
// Add property name aliases
if (javaPropertyName != null) {
if (rubyCasedName.startsWith("get_")) {
rubyPropertyName = rubyCasedName.substring(4);
if (argCount == 0 || // getFoo => foo
argCount == 1 && argTypes[0] == int.class) { // getFoo(int) => foo(int)
addUnassignedAlias(javaPropertyName,assignedNames,installer);
addUnassignedAlias(rubyPropertyName,assignedNames,installer);
}
} else if (rubyCasedName.startsWith("set_")) {
rubyPropertyName = rubyCasedName.substring(4);
if (argCount == 1 && resultType == void.class) { // setFoo(Foo) => foo=(Foo)
addUnassignedAlias(javaPropertyName+'=',assignedNames,installer);
addUnassignedAlias(rubyPropertyName+'=',assignedNames,installer);
}
} else if (rubyCasedName.startsWith("is_")) {
rubyPropertyName = rubyCasedName.substring(3);
if (resultType == boolean.class) { // isFoo() => foo, isFoo(*) => foo(*)
addUnassignedAlias(javaPropertyName,assignedNames,installer);
addUnassignedAlias(rubyPropertyName,assignedNames,installer);
}
}
}
// Additionally add ?-postfixed aliases to any boolean methods and properties.
if (resultType == boolean.class) {
// is_something?, contains_thing?
addUnassignedAlias(rubyCasedName+'?',assignedNames,installer);
if (rubyPropertyName != null) {
// something?
addUnassignedAlias(rubyPropertyName+'?',assignedNames,installer);
}
}
}
}
private static void addUnassignedAlias(String name, Map<String, AssignedName> assignedNames,
MethodInstaller installer) {
if (name == null) return;
AssignedName assignedName = assignedNames.get(name);
// TODO: missing additional logic for dealing with conflicting protected fields.
if (Priority.ALIAS.moreImportantThan(assignedName)) {
installer.addAlias(name);
assignedNames.put(name, new AssignedName(name, Priority.ALIAS));
} else if (Priority.ALIAS.asImportantAs(assignedName)) {
installer.addAlias(name);
}
}
private void installClassClasses(final Class<?> javaClass, final RubyModule proxy) {
// setup constants for public inner classes
Class<?>[] classes = getDeclaredClasses(javaClass);
for (int i = classes.length; --i >= 0; ) {
if (javaClass == classes[i].getDeclaringClass()) {
Class<?> clazz = classes[i];
// no non-public inner classes
if (!Modifier.isPublic(clazz.getModifiers())) continue;
String simpleName = getSimpleName(clazz);
if (simpleName.length() == 0) continue;
final IRubyObject innerProxy = Java.get_proxy_class(JAVA_UTILITIES,get(getRuntime(),clazz));
if (IdUtil.isConstant(simpleName)) {
if (proxy.getConstantAt(simpleName) == null) {
proxy.const_set(getRuntime().newString(simpleName), innerProxy);
}
} else {
// lower-case name
if (!proxy.respondsTo(simpleName)) {
// define a class method
proxy.getSingletonClass().addMethod(simpleName, new JavaMethodZero(proxy.getSingletonClass(), Visibility.PUBLIC) {
@Override
public IRubyObject call(ThreadContext context, IRubyObject self, RubyModule clazz, String name) {
return innerProxy;
}
});
}
}
}
}
}
private synchronized void installClassConstructors(final RubyClass proxy) {
if (constructorInstaller != null) {
constructorInstaller.install(proxy);
constructorInstaller = null;
}
}
private synchronized void installClassFields(final RubyClass proxy) {
for (ConstantField field : constantFields) {
field.install(proxy);
}
constantFields = null;
}
private synchronized void installClassMethods(final RubyClass proxy) {
for (NamedInstaller installer : staticInstallers.values()) {
installer.install(proxy);
}
staticInstallers = null;
for (NamedInstaller installer : instanceInstallers.values()) {
installer.install(proxy);
}
instanceInstallers = null;
}
private void setupClassConstructors(Class<?> javaClass) {
// TODO: protected methods. this is going to require a rework
// of some of the mechanism.
Constructor[] clsConstructors = getConstructors(javaClass);
// create constructorInstaller; if there are no constructors, it will disable construction
constructorInstaller = new ConstructorInvokerInstaller("__jcreate!");
for (int i = clsConstructors.length; --i >= 0;) {
// we need to collect all methods, though we'll only
// install the ones that are named in this class
Constructor ctor = clsConstructors[i];
constructorInstaller.addConstructor(ctor, javaClass);
}
}
private void addField(Map <String, NamedInstaller> callbacks, Map<String, AssignedName> names,
Field field, boolean isFinal, boolean isStatic) {
String name = field.getName();
if (Priority.FIELD.lessImportantThan(names.get(name))) return;
names.put(name, new AssignedName(name, Priority.FIELD));
callbacks.put(name, isStatic ? new StaticFieldGetterInstaller(name, field) :
new InstanceFieldGetterInstaller(name, field));
if (!isFinal) {
String setName = name + '=';
callbacks.put(setName, isStatic ? new StaticFieldSetterInstaller(setName, field) :
new InstanceFieldSetterInstaller(setName, field));
}
}
private void setupClassFields(Class<?> javaClass, InitializerState state) {
Field[] fields = getFields(javaClass);
for (int i = fields.length; --i >= 0;) {
Field field = fields[i];
if (javaClass != field.getDeclaringClass()) continue;
if (ConstantField.isConstant(field)) {
state.constantFields.add(new ConstantField(field));
continue;
}
int modifiers = field.getModifiers();
if (Modifier.isStatic(modifiers)) {
addField(state.staticCallbacks, state.staticNames, field, Modifier.isFinal(modifiers), true);
} else {
addField(state.instanceCallbacks, state.instanceNames, field, Modifier.isFinal(modifiers), false);
}
}
}
private static String fixScalaNames(String name) {
String s = name;
for (Map.Entry<String, String> entry : SCALA_OPERATORS.entrySet()) {
s = s.replaceAll(entry.getKey(), entry.getValue());
}
return s;
}
private static final Map<String, String> SCALA_OPERATORS;
static {
Map<String, String> tmp = new HashMap();
tmp.put("\\$plus", "+");
tmp.put("\\$minus", "-");
tmp.put("\\$colon", ":");
tmp.put("\\$div", "/");
tmp.put("\\$eq", "=");
tmp.put("\\$less", "<");
tmp.put("\\$greater", ">");
tmp.put("\\$bslash", "\\\\");
tmp.put("\\$hash", "#");
tmp.put("\\$times", "*");
tmp.put("\\$bang", "!");
tmp.put("\\$at", "@");
tmp.put("\\$percent", "%");
tmp.put("\\$up", "^");
tmp.put("\\$amp", "&");
tmp.put("\\$tilde", "~");
tmp.put("\\$qmark", "?");
tmp.put("\\$bar", "|");
SCALA_OPERATORS = Collections.unmodifiableMap(tmp);
}
private void setupClassMethods(Class<?> javaClass, InitializerState state) {
// TODO: protected methods. this is going to require a rework of some of the mechanism.
Method[] methods = getMethods(javaClass);
for (int i = methods.length; --i >= 0;) {
// we need to collect all methods, though we'll only
// install the ones that are named in this class
Method method = methods[i];
String name = method.getName();
if (Modifier.isStatic(method.getModifiers())) {
AssignedName assignedName = state.staticNames.get(name);
// For JRUBY-4505, restore __method methods for reserved names
if (STATIC_RESERVED_NAMES.containsKey(method.getName())) {
installStaticMethods(state.staticCallbacks, javaClass, method, name + METHOD_MANGLE);
continue;
}
if (assignedName == null) {
state.staticNames.put(name, new AssignedName(name, Priority.METHOD));
} else {
if (Priority.METHOD.lessImportantThan(assignedName)) continue;
if (!Priority.METHOD.asImportantAs(assignedName)) {
state.staticCallbacks.remove(name);
state.staticCallbacks.remove(name + '=');
state.staticNames.put(name, new AssignedName(name, Priority.METHOD));
}
}
installStaticMethods(state.staticCallbacks, javaClass, method, name);
} else {
AssignedName assignedName = state.instanceNames.get(name);
// For JRUBY-4505, restore __method methods for reserved names
if (INSTANCE_RESERVED_NAMES.containsKey(method.getName())) {
installInstanceMethods(state.instanceCallbacks, javaClass, method, name + METHOD_MANGLE);
continue;
}
if (assignedName == null) {
state.instanceNames.put(name, new AssignedName(name, Priority.METHOD));
} else {
if (Priority.METHOD.lessImportantThan(assignedName)) continue;
if (!Priority.METHOD.asImportantAs(assignedName)) {
state.instanceCallbacks.remove(name);
state.instanceCallbacks.remove(name + '=');
state.instanceNames.put(name, new AssignedName(name, Priority.METHOD));
}