jdk/src/share/classes/java/lang/invoke/MethodHandleStatics.java
author jrose
Wed, 01 Jun 2011 23:56:47 -0700
changeset 9780 6fc3b49cfee4
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child 10419 12c063b39232
permissions -rw-r--r--
7050328: (jsr-292) findConstructor throws ExceptionInInitializerError if run under SecurityManager Summary: Wrap system property and reflection accesses under doPrivileged. Ensure constant pool linkage bypasses the SM as specified. Reviewed-by: kvn, never
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/*
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 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package java.lang.invoke;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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/**
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 * This class consists exclusively of static names internal to the
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 * method handle implementation.
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 * Usage:  {@code import static java.lang.invoke.MethodHandleStatics.*}
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 * @author John Rose, JSR 292 EG
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 */
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/*non-public*/ class MethodHandleStatics {
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    private MethodHandleStatics() { }  // do not instantiate
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    static final boolean DEBUG_METHOD_HANDLE_NAMES;
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    static {
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        final Object[] values = { false };
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        AccessController.doPrivileged(new PrivilegedAction<Void>() {
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                public Void run() {
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                    values[0] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DEBUG_NAMES");
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                    return null;
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                }
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            });
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        DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0];
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    }
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    /*non-public*/ static String getNameString(MethodHandle target, MethodType type) {
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        if (type == null)
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            type = target.type();
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        MemberName name = null;
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        if (target != null)
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            name = MethodHandleNatives.getMethodName(target);
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        if (name == null)
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            return "invoke" + type;
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        return name.getName() + type;
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    }
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    /*non-public*/ static String getNameString(MethodHandle target, MethodHandle typeHolder) {
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        return getNameString(target, typeHolder == null ? (MethodType) null : typeHolder.type());
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    }
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    /*non-public*/ static String getNameString(MethodHandle target) {
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        return getNameString(target, (MethodType) null);
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    }
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    /*non-public*/ static String addTypeString(Object obj, MethodHandle target) {
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        String str = String.valueOf(obj);
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        if (target == null)  return str;
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        int paren = str.indexOf('(');
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        if (paren >= 0) str = str.substring(0, paren);
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        return str + target.type();
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    }
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    static void checkSpreadArgument(Object av, int n) {
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        if (av == null) {
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            if (n == 0)  return;
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        } else if (av instanceof Object[]) {
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            int len = ((Object[])av).length;
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            if (len == n)  return;
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        } else {
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            int len = java.lang.reflect.Array.getLength(av);
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            if (len == n)  return;
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        }
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        // fall through to error:
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        throw newIllegalArgumentException("Array is not of length "+n);
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    }
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    // handy shared exception makers (they simplify the common case code)
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    /*non-public*/ static RuntimeException newIllegalStateException(String message) {
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        return new IllegalStateException(message);
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    }
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    /*non-public*/ static RuntimeException newIllegalStateException(String message, Object obj) {
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        return new IllegalStateException(message(message, obj));
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    }
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    /*non-public*/ static RuntimeException newIllegalArgumentException(String message) {
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        return new IllegalArgumentException(message);
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    }
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    /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj) {
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        return new IllegalArgumentException(message(message, obj));
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    }
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    /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) {
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        return new IllegalArgumentException(message(message, obj, obj2));
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    }
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    /*non-public*/ static Error uncaughtException(Exception ex) {
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        Error err = new InternalError("uncaught exception");
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        err.initCause(ex);
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        return err;
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    }
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    private static String message(String message, Object obj) {
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        if (obj != null)  message = message + ": " + obj;
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        return message;
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    }
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    private static String message(String message, Object obj, Object obj2) {
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        if (obj != null || obj2 != null)  message = message + ": " + obj + ", " + obj2;
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        return message;
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    }
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}