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/*
* Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package org.openjdk.tools.javac.model;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import javax.lang.model.AnnotatedConstruct;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.*;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.util.Elements;
import javax.tools.JavaFileObject;
import static javax.lang.model.util.ElementFilter.methodsIn;
import org.openjdk.source.util.JavacTask;
import org.openjdk.tools.javac.api.JavacTaskImpl;
import org.openjdk.tools.javac.code.*;
import org.openjdk.tools.javac.code.Attribute.Compound;
import org.openjdk.tools.javac.code.Directive.ExportsDirective;
import org.openjdk.tools.javac.code.Directive.ExportsFlag;
import org.openjdk.tools.javac.code.Directive.OpensDirective;
import org.openjdk.tools.javac.code.Directive.OpensFlag;
import org.openjdk.tools.javac.code.Directive.RequiresDirective;
import org.openjdk.tools.javac.code.Directive.RequiresFlag;
import org.openjdk.tools.javac.code.Scope.WriteableScope;
import org.openjdk.tools.javac.code.Symbol.*;
import org.openjdk.tools.javac.comp.AttrContext;
import org.openjdk.tools.javac.comp.Enter;
import org.openjdk.tools.javac.comp.Env;
import org.openjdk.tools.javac.main.JavaCompiler;
import org.openjdk.tools.javac.processing.PrintingProcessor;
import org.openjdk.tools.javac.tree.JCTree;
import org.openjdk.tools.javac.tree.JCTree.*;
import org.openjdk.tools.javac.tree.TreeInfo;
import org.openjdk.tools.javac.tree.TreeScanner;
import org.openjdk.tools.javac.util.*;
import org.openjdk.tools.javac.util.DefinedBy.Api;
import org.openjdk.tools.javac.util.Name;
import static org.openjdk.tools.javac.code.Kinds.Kind.*;
import static org.openjdk.tools.javac.code.Scope.LookupKind.NON_RECURSIVE;
import static org.openjdk.tools.javac.code.TypeTag.CLASS;
import org.openjdk.tools.javac.comp.Modules;
import org.openjdk.tools.javac.comp.Resolve;
import org.openjdk.tools.javac.comp.Resolve.RecoveryLoadClass;
import org.openjdk.tools.javac.resources.CompilerProperties.Notes;
import static org.openjdk.tools.javac.tree.JCTree.Tag.*;
/**
* Utility methods for operating on program elements.
*
* This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own
* risk. This code and its internal interfaces are subject to change
* or deletion without notice.
*/
public class JavacElements implements Elements {
private final JavaCompiler javaCompiler;
private final Symtab syms;
private final Modules modules;
private final Names names;
private final Types types;
private final Enter enter;
private final Resolve resolve;
private final JavacTaskImpl javacTaskImpl;
private final Log log;
private final boolean allowModules;
public static JavacElements instance(Context context) {
JavacElements instance = context.get(JavacElements.class);
if (instance == null)
instance = new JavacElements(context);
return instance;
}
protected JavacElements(Context context) {
context.put(JavacElements.class, this);
javaCompiler = JavaCompiler.instance(context);
syms = Symtab.instance(context);
modules = Modules.instance(context);
names = Names.instance(context);
types = Types.instance(context);
enter = Enter.instance(context);
resolve = Resolve.instance(context);
JavacTask t = context.get(JavacTask.class);
javacTaskImpl = t instanceof JavacTaskImpl ? (JavacTaskImpl) t : null;
log = Log.instance(context);
Source source = Source.instance(context);
allowModules = source.allowModules();
}
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public Set getAllModuleElements() {
if (allowModules)
return Collections.unmodifiableSet(modules.allModules());
else
return Collections.emptySet();
}
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public ModuleSymbol getModuleElement(CharSequence name) {
ensureEntered("getModuleElement");
if (modules.getDefaultModule() == syms.noModule)
return null;
String strName = name.toString();
if (strName.equals(""))
return syms.unnamedModule;
return modules.getObservableModule(names.fromString(strName));
}
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public PackageSymbol getPackageElement(CharSequence name) {
return doGetPackageElement(null, name);
}
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public PackageSymbol getPackageElement(ModuleElement module, CharSequence name) {
module.getClass();
return doGetPackageElement(module, name);
}
private PackageSymbol doGetPackageElement(ModuleElement module, CharSequence name) {
ensureEntered("getPackageElement");
return doGetElement(module, "getPackageElement", name, PackageSymbol.class);
}
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public ClassSymbol getTypeElement(CharSequence name) {
return doGetTypeElement(null, name);
}
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public ClassSymbol getTypeElement(ModuleElement module, CharSequence name) {
module.getClass();
return doGetTypeElement(module, name);
}
private ClassSymbol doGetTypeElement(ModuleElement module, CharSequence name) {
ensureEntered("getTypeElement");
return doGetElement(module, "getTypeElement", name, ClassSymbol.class);
}
private S doGetElement(ModuleElement module, String methodName,
CharSequence name, Class clazz) {
String strName = name.toString();
if (!SourceVersion.isName(strName) && (!strName.isEmpty() || clazz == ClassSymbol.class)) {
return null;
}
if (module == null) {
return unboundNameToSymbol(methodName, strName, clazz);
} else {
return nameToSymbol((ModuleSymbol) module, strName, clazz);
}
}
private final Set alreadyWarnedDuplicates = new HashSet<>();
private S unboundNameToSymbol(String methodName,
String nameStr,
Class clazz) {
if (modules.getDefaultModule() == syms.noModule) { //not a modular mode:
return nameToSymbol(syms.noModule, nameStr, clazz);
}
Set found = new LinkedHashSet<>();
for (ModuleSymbol msym : modules.allModules()) {
S sym = nameToSymbol(msym, nameStr, clazz);
if (sym != null) {
if (!allowModules || clazz == ClassSymbol.class || !sym.members().isEmpty()) {
//do not add packages without members:
found.add(sym);
}
}
}
if (found.size() == 1) {
return found.iterator().next();
} else if (found.size() > 1) {
//more than one element found, produce a note:
if (alreadyWarnedDuplicates.add(methodName + ":" + nameStr)) {
String moduleNames = found.stream()
.map(s -> s.packge().modle)
.map(m -> m.toString())
.collect(Collectors.joining(", "));
log.note(Notes.MultipleElements(methodName, nameStr, moduleNames));
}
return null;
} else {
//not found, or more than one element found:
return null;
}
}
/**
* Returns a symbol given the type's or package's canonical name,
* or null if the name isn't found.
*/
private S nameToSymbol(ModuleSymbol module, String nameStr, Class clazz) {
Name name = names.fromString(nameStr);
// First check cache.
Symbol sym = (clazz == ClassSymbol.class)
? syms.getClass(module, name)
: syms.lookupPackage(module, name);
try {
if (sym == null)
sym = javaCompiler.resolveIdent(module, nameStr);
sym.complete();
return (sym.kind != ERR &&
sym.exists() &&
clazz.isInstance(sym) &&
name.equals(sym.getQualifiedName()))
? clazz.cast(sym)
: null;
} catch (CompletionFailure e) {
return null;
}
}
/**
* Returns the tree for an annotation given the annotated element
* and the element's own tree. Returns null if the tree cannot be found.
*/
private JCTree matchAnnoToTree(AnnotationMirror findme,
Element e, JCTree tree) {
Symbol sym = cast(Symbol.class, e);
class Vis extends JCTree.Visitor {
List result = null;
public void visitPackageDef(JCPackageDecl tree) {
result = tree.annotations;
}
public void visitClassDef(JCClassDecl tree) {
result = tree.mods.annotations;
}
public void visitMethodDef(JCMethodDecl tree) {
result = tree.mods.annotations;
}
public void visitVarDef(JCVariableDecl tree) {
result = tree.mods.annotations;
}
@Override
public void visitTypeParameter(JCTypeParameter tree) {
result = tree.annotations;
}
}
Vis vis = new Vis();
tree.accept(vis);
if (vis.result == null)
return null;
List annos = sym.getAnnotationMirrors();
return matchAnnoToTree(cast(Attribute.Compound.class, findme),
annos,
vis.result);
}
/**
* Returns the tree for an annotation given a list of annotations
* in which to search (recursively) and their corresponding trees.
* Returns null if the tree cannot be found.
*/
private JCTree matchAnnoToTree(Attribute.Compound findme,
List annos,
List trees) {
for (Attribute.Compound anno : annos) {
for (JCAnnotation tree : trees) {
if (tree.type.tsym != anno.type.tsym)
continue;
JCTree match = matchAttributeToTree(findme, anno, tree);
if (match != null)
return match;
}
}
return null;
}
/**
* Returns the tree for an attribute given an enclosing attribute to
* search (recursively) and the enclosing attribute's corresponding tree.
* Returns null if the tree cannot be found.
*/
private JCTree matchAttributeToTree(final Attribute findme,
final Attribute attr,
final JCTree tree) {
if (attr == findme)
return tree;
class Vis implements Attribute.Visitor {
JCTree result = null;
public void visitConstant(Attribute.Constant value) {
}
public void visitClass(Attribute.Class clazz) {
}
public void visitCompound(Attribute.Compound anno) {
for (Pair pair : anno.values) {
JCExpression expr = scanForAssign(pair.fst, tree);
if (expr != null) {
JCTree match = matchAttributeToTree(findme, pair.snd, expr);
if (match != null) {
result = match;
return;
}
}
}
}
public void visitArray(Attribute.Array array) {
if (tree.hasTag(NEWARRAY)) {
List elems = ((JCNewArray)tree).elems;
for (Attribute value : array.values) {
JCTree match = matchAttributeToTree(findme, value, elems.head);
if (match != null) {
result = match;
return;
}
elems = elems.tail;
}
} else if (array.values.length == 1) {
// the tree may not be a NEWARRAY for single-element array initializers
result = matchAttributeToTree(findme, array.values[0], tree);
}
}
public void visitEnum(Attribute.Enum e) {
}
public void visitError(Attribute.Error e) {
}
}
Vis vis = new Vis();
attr.accept(vis);
return vis.result;
}
/**
* Scans for a JCAssign node with a LHS matching a given
* symbol, and returns its RHS. Does not scan nested JCAnnotations.
*/
private JCExpression scanForAssign(final MethodSymbol sym,
final JCTree tree) {
class TS extends TreeScanner {
JCExpression result = null;
public void scan(JCTree t) {
if (t != null && result == null)
t.accept(this);
}
public void visitAnnotation(JCAnnotation t) {
if (t == tree)
scan(t.args);
}
public void visitAssign(JCAssign t) {
if (t.lhs.hasTag(IDENT)) {
JCIdent ident = (JCIdent) t.lhs;
if (ident.sym == sym)
result = t.rhs;
}
}
}
TS scanner = new TS();
tree.accept(scanner);
return scanner.result;
}
/**
* Returns the tree node corresponding to this element, or null
* if none can be found.
*/
public JCTree getTree(Element e) {
Pair treeTop = getTreeAndTopLevel(e);
return (treeTop != null) ? treeTop.fst : null;
}
@DefinedBy(Api.LANGUAGE_MODEL)
public String getDocComment(Element e) {
// Our doc comment is contained in a map in our toplevel,
// indexed by our tree. Find our enter environment, which gives
// us our toplevel. It also gives us a tree that contains our
// tree: walk it to find our tree. This is painful.
Pair treeTop = getTreeAndTopLevel(e);
if (treeTop == null)
return null;
JCTree tree = treeTop.fst;
JCCompilationUnit toplevel = treeTop.snd;
if (toplevel.docComments == null)
return null;
return toplevel.docComments.getCommentText(tree);
}
@DefinedBy(Api.LANGUAGE_MODEL)
public PackageElement getPackageOf(Element e) {
return cast(Symbol.class, e).packge();
}
@DefinedBy(Api.LANGUAGE_MODEL)
public ModuleElement getModuleOf(Element e) {
Symbol sym = cast(Symbol.class, e);
if (modules.getDefaultModule() == syms.noModule)
return null;
return (sym.kind == MDL) ? ((ModuleElement) e) : sym.packge().modle;
}
@DefinedBy(Api.LANGUAGE_MODEL)
public boolean isDeprecated(Element e) {
Symbol sym = cast(Symbol.class, e);
sym.complete();
return sym.isDeprecated();
}
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public Origin getOrigin(Element e) {
Symbol sym = cast(Symbol.class, e);
if ((sym.flags() & Flags.GENERATEDCONSTR) != 0)
return Origin.MANDATED;
//TypeElement.getEnclosedElements does not return synthetic elements,
//and most synthetic elements are not read from the classfile anyway:
return Origin.EXPLICIT;
}
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public Origin getOrigin(AnnotatedConstruct c, AnnotationMirror a) {
Compound ac = cast(Compound.class, a);
if (ac.isSynthesized())
return Origin.MANDATED;
return Origin.EXPLICIT;
}
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public Origin getOrigin(ModuleElement m, ModuleElement.Directive directive) {
switch (directive.getKind()) {
case REQUIRES:
RequiresDirective rd = cast(RequiresDirective.class, directive);
if (rd.flags.contains(RequiresFlag.MANDATED))
return Origin.MANDATED;
if (rd.flags.contains(RequiresFlag.SYNTHETIC))
return Origin.SYNTHETIC;
return Origin.EXPLICIT;
case EXPORTS:
ExportsDirective ed = cast(ExportsDirective.class, directive);
if (ed.flags.contains(ExportsFlag.MANDATED))
return Origin.MANDATED;
if (ed.flags.contains(ExportsFlag.SYNTHETIC))
return Origin.SYNTHETIC;
return Origin.EXPLICIT;
case OPENS:
OpensDirective od = cast(OpensDirective.class, directive);
if (od.flags.contains(OpensFlag.MANDATED))
return Origin.MANDATED;
if (od.flags.contains(OpensFlag.SYNTHETIC))
return Origin.SYNTHETIC;
return Origin.EXPLICIT;
}
return Origin.EXPLICIT;
}
@DefinedBy(Api.LANGUAGE_MODEL)
public Name getBinaryName(TypeElement type) {
return cast(TypeSymbol.class, type).flatName();
}
@DefinedBy(Api.LANGUAGE_MODEL)
public Map getElementValuesWithDefaults(
AnnotationMirror a) {
Attribute.Compound anno = cast(Attribute.Compound.class, a);
DeclaredType annotype = a.getAnnotationType();
Map valmap = anno.getElementValues();
for (ExecutableElement ex :
methodsIn(annotype.asElement().getEnclosedElements())) {
MethodSymbol meth = (MethodSymbol) ex;
Attribute defaultValue = meth.getDefaultValue();
if (defaultValue != null && !valmap.containsKey(meth)) {
valmap.put(meth, defaultValue);
}
}
return valmap;
}
/**
* {@inheritDoc}
*/
@DefinedBy(Api.LANGUAGE_MODEL)
public FilteredMemberList getAllMembers(TypeElement element) {
Symbol sym = cast(Symbol.class, element);
WriteableScope scope = sym.members().dupUnshared();
List closure = types.closure(sym.asType());
for (Type t : closure)
addMembers(scope, t);
return new FilteredMemberList(scope);
}
// where
private void addMembers(WriteableScope scope, Type type) {
members:
for (Symbol e : type.asElement().members().getSymbols(NON_RECURSIVE)) {
for (Symbol overrider : scope.getSymbolsByName(e.getSimpleName())) {
if (overrider.kind == e.kind && (overrider.flags() & Flags.SYNTHETIC) == 0) {
if (overrider.getKind() == ElementKind.METHOD &&
overrides((ExecutableElement)overrider, (ExecutableElement)e, (TypeElement)type.asElement())) {
continue members;
}
}
}
boolean derived = e.getEnclosingElement() != scope.owner;
ElementKind kind = e.getKind();
boolean initializer = kind == ElementKind.CONSTRUCTOR
|| kind == ElementKind.INSTANCE_INIT
|| kind == ElementKind.STATIC_INIT;
if (!derived || (!initializer && e.isInheritedIn(scope.owner, types)))
scope.enter(e);
}
}
/**
* Returns all annotations of an element, whether
* inherited or directly present.
*
* @param e the element being examined
* @return all annotations of the element
*/
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public List getAllAnnotationMirrors(Element e) {
Symbol sym = cast(Symbol.class, e);
List annos = sym.getAnnotationMirrors();
while (sym.getKind() == ElementKind.CLASS) {
Type sup = ((ClassSymbol) sym).getSuperclass();
if (!sup.hasTag(CLASS) || sup.isErroneous() ||
sup.tsym == syms.objectType.tsym) {
break;
}
sym = sup.tsym;
List oldAnnos = annos;
List newAnnos = sym.getAnnotationMirrors();
for (Attribute.Compound anno : newAnnos) {
if (isInherited(anno.type) &&
!containsAnnoOfType(oldAnnos, anno.type)) {
annos = annos.prepend(anno);
}
}
}
return annos;
}
/**
* Tests whether an annotation type is @Inherited.
*/
private boolean isInherited(Type annotype) {
return annotype.tsym.attribute(syms.inheritedType.tsym) != null;
}
/**
* Tests whether a list of annotations contains an annotation
* of a given type.
*/
private static boolean containsAnnoOfType(List annos,
Type type) {
for (Attribute.Compound anno : annos) {
if (anno.type.tsym == type.tsym)
return true;
}
return false;
}
@DefinedBy(Api.LANGUAGE_MODEL)
public boolean hides(Element hiderEl, Element hideeEl) {
Symbol hider = cast(Symbol.class, hiderEl);
Symbol hidee = cast(Symbol.class, hideeEl);
// Fields only hide fields; methods only methods; types only types.
// Names must match. Nothing hides itself (just try it).
if (hider == hidee ||
hider.kind != hidee.kind ||
hider.name != hidee.name) {
return false;
}
// Only static methods can hide other methods.
// Methods only hide methods with matching signatures.
if (hider.kind == MTH) {
if (!hider.isStatic() ||
!types.isSubSignature(hider.type, hidee.type)) {
return false;
}
}
// Hider must be in a subclass of hidee's class.
// Note that if M1 hides M2, and M2 hides M3, and M3 is accessible
// in M1's class, then M1 and M2 both hide M3.
ClassSymbol hiderClass = hider.owner.enclClass();
ClassSymbol hideeClass = hidee.owner.enclClass();
if (hiderClass == null || hideeClass == null ||
!hiderClass.isSubClass(hideeClass, types)) {
return false;
}
// Hidee must be accessible in hider's class.
// The method isInheritedIn is poorly named: it checks only access.
return hidee.isInheritedIn(hiderClass, types);
}
@DefinedBy(Api.LANGUAGE_MODEL)
public boolean overrides(ExecutableElement riderEl,
ExecutableElement rideeEl, TypeElement typeEl) {
MethodSymbol rider = cast(MethodSymbol.class, riderEl);
MethodSymbol ridee = cast(MethodSymbol.class, rideeEl);
ClassSymbol origin = cast(ClassSymbol.class, typeEl);
return rider.name == ridee.name &&
// not reflexive as per JLS
rider != ridee &&
// we don't care if ridee is static, though that wouldn't
// compile
!rider.isStatic() &&
// Symbol.overrides assumes the following
ridee.isMemberOf(origin, types) &&
// check access and signatures; don't check return types
rider.overrides(ridee, origin, types, false);
}
@DefinedBy(Api.LANGUAGE_MODEL)
public String getConstantExpression(Object value) {
return Constants.format(value);
}
/**
* Print a representation of the elements to the given writer in
* the specified order. The main purpose of this method is for
* diagnostics. The exact format of the output is not
* specified and is subject to change.
*
* @param w the writer to print the output to
* @param elements the elements to print
*/
@DefinedBy(Api.LANGUAGE_MODEL)
public void printElements(java.io.Writer w, Element... elements) {
for (Element element : elements)
(new PrintingProcessor.PrintingElementVisitor(w, this)).visit(element).flush();
}
@DefinedBy(Api.LANGUAGE_MODEL)
public Name getName(CharSequence cs) {
return names.fromString(cs.toString());
}
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public boolean isFunctionalInterface(TypeElement element) {
if (element.getKind() != ElementKind.INTERFACE)
return false;
else {
TypeSymbol tsym = cast(TypeSymbol.class, element);
return types.isFunctionalInterface(tsym);
}
}
/**
* Returns the tree node and compilation unit corresponding to this
* element, or null if they can't be found.
*/
private Pair getTreeAndTopLevel(Element e) {
Symbol sym = cast(Symbol.class, e);
Env enterEnv = getEnterEnv(sym);
if (enterEnv == null)
return null;
JCTree tree = TreeInfo.declarationFor(sym, enterEnv.tree);
if (tree == null || enterEnv.toplevel == null)
return null;
return new Pair<>(tree, enterEnv.toplevel);
}
/**
* Returns the best approximation for the tree node and compilation unit
* corresponding to the given element, annotation and value.
* If the element is null, null is returned.
* If the annotation is null or cannot be found, the tree node and
* compilation unit for the element is returned.
* If the annotation value is null or cannot be found, the tree node and
* compilation unit for the annotation is returned.
*/
public Pair getTreeAndTopLevel(
Element e, AnnotationMirror a, AnnotationValue v) {
if (e == null)
return null;
Pair elemTreeTop = getTreeAndTopLevel(e);
if (elemTreeTop == null)
return null;
if (a == null)
return elemTreeTop;
JCTree annoTree = matchAnnoToTree(a, e, elemTreeTop.fst);
if (annoTree == null)
return elemTreeTop;
if (v == null)
return new Pair<>(annoTree, elemTreeTop.snd);
JCTree valueTree = matchAttributeToTree(
cast(Attribute.class, v), cast(Attribute.class, a), annoTree);
if (valueTree == null)
return new Pair<>(annoTree, elemTreeTop.snd);
return new Pair<>(valueTree, elemTreeTop.snd);
}
/**
* Returns a symbol's enter environment, or null if it has none.
*/
private Env getEnterEnv(Symbol sym) {
// Get enclosing class of sym, or sym itself if it is a class
// package, or module.
TypeSymbol ts = null;
switch (sym.kind) {
case PCK:
ts = (PackageSymbol)sym;
break;
case MDL:
ts = (ModuleSymbol)sym;
break;
default:
ts = sym.enclClass();
}
return (ts != null)
? enter.getEnv(ts)
: null;
}
private void ensureEntered(String methodName) {
if (javacTaskImpl != null) {
javacTaskImpl.ensureEntered();
}
if (!javaCompiler.isEnterDone()) {
throw new IllegalStateException("Cannot use Elements." + methodName + " before the TaskEvent.Kind.ENTER finished event.");
}
}
/**
* Returns an object cast to the specified type.
* @throws NullPointerException if the object is {@code null}
* @throws IllegalArgumentException if the object is of the wrong type
*/
private static T cast(Class clazz, Object o) {
if (! clazz.isInstance(o))
throw new IllegalArgumentException(o.toString());
return clazz.cast(o);
}
}
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