1 /*
   2  * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package jdk.vm.ci.meta;
  24 
  25 /**
  26  * Miscellaneous collection of utility methods used by {@code jdk.vm.ci.meta} and its clients.
  27  */
  28 public class MetaUtil {
  29 
  30     /**
  31      * Extends the functionality of {@link Class#getSimpleName()} to include a non-empty string for
  32      * anonymous and local classes.
  33      *
  34      * @param clazz the class for which the simple name is being requested
  35      * @param withEnclosingClass specifies if the returned name should be qualified with the name(s)
  36      *            of the enclosing class/classes of {@code clazz} (if any). This option is ignored
  37      *            if {@code clazz} denotes an anonymous or local class.
  38      * @return the simple name
  39      */
  40     public static String getSimpleName(Class<?> clazz, boolean withEnclosingClass) {
  41         final String simpleName = clazz.getSimpleName();
  42         if (simpleName.length() != 0) {
  43             if (withEnclosingClass) {
  44                 String prefix = "";
  45                 Class<?> enclosingClass = clazz;
  46                 while ((enclosingClass = enclosingClass.getEnclosingClass()) != null) {
  47                     prefix = enclosingClass.getSimpleName() + "." + prefix;
  48                 }
  49                 return prefix + simpleName;
  50             }
  51             return simpleName;
  52         }
  53         // Must be an anonymous or local class
  54         final String name = clazz.getName();
  55         int index = name.indexOf('$');
  56         if (index == -1) {
  57             return name;
  58         }
  59         index = name.lastIndexOf('.', index);
  60         if (index == -1) {
  61             return name;
  62         }
  63         return name.substring(index + 1);























  64     }
  65 
  66     /**
  67      * Converts a type name in internal form to an external form.
  68      *
  69      * @param name the internal name to convert
  70      * @param qualified whether the returned name should be qualified with the package name
  71      * @param classForNameCompatible specifies if the returned name for array types should be in
  72      *            {@link Class#forName(String)} format (e.g., {@code "[Ljava.lang.Object;"},
  73      *            {@code "[[I"}) or in Java source code format (e.g., {@code "java.lang.Object[]"},
  74      *            {@code "int[][]"} ).
  75      */
  76     public static String internalNameToJava(String name, boolean qualified, boolean classForNameCompatible) {
  77         switch (name.charAt(0)) {
  78             case 'L': {
  79                 String result = name.substring(1, name.length() - 1).replace('/', '.');
  80                 if (!qualified) {
  81                     final int lastDot = result.lastIndexOf('.');
  82                     if (lastDot != -1) {
  83                         result = result.substring(lastDot + 1);

   1 /*
   2  * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package jdk.vm.ci.meta;
  24 
  25 /**
  26  * Miscellaneous collection of utility methods used by {@code jdk.vm.ci.meta} and its clients.
  27  */
  28 public class MetaUtil {
  29 
  30     /**
  31      * Extends the functionality of {@link Class#getSimpleName()} to include a non-empty string for
  32      * anonymous and local classes.
  33      *
  34      * @param clazz the class for which the simple name is being requested
  35      * @param withEnclosingClass specifies if the returned name should be qualified with the name(s)
  36      *            of the enclosing class/classes of {@code clazz} (if any). This option is ignored
  37      *            if {@code clazz} denotes an anonymous or local class.
  38      * @return the simple name
  39      */
  40     public static String getSimpleName(Class<?> clazz, boolean withEnclosingClass) {
  41         final String simpleName = safeSimpleName(clazz);
  42         if (simpleName.length() != 0) {
  43             if (withEnclosingClass) {
  44                 String prefix = "";
  45                 Class<?> enclosingClass = clazz;
  46                 while ((enclosingClass = enclosingClass.getEnclosingClass()) != null) {
  47                     prefix = safeSimpleName(enclosingClass) + "." + prefix;
  48                 }
  49                 return prefix + simpleName;
  50             }
  51             return simpleName;
  52         }
  53         // Must be an anonymous or local class
  54         final String name = clazz.getName();
  55         int index = name.indexOf('$');
  56         if (index == -1) {
  57             return name;
  58         }
  59         index = name.lastIndexOf('.', index);
  60         if (index == -1) {
  61             return name;
  62         }
  63         return name.substring(index + 1);
  64     }
  65 
  66     private static String safeSimpleName(Class<?> clazz) {
  67         try {
  68             return clazz.getSimpleName();
  69         } catch (InternalError e) {
  70             // Scala inner class names do not always start with '$',
  71             // causing Class.getSimpleName to throw an InternalError
  72             Class<?> enclosingClass = clazz.getEnclosingClass();
  73             String fqn = clazz.getName();
  74             if (enclosingClass == null) {
  75                 // Should never happen given logic in
  76                 // Class.getSimpleName but best be safe
  77                 return fqn;
  78             }
  79             String enclosingFQN = enclosingClass.getName();
  80             int length = fqn.length();
  81             if (enclosingFQN.length() >= length) {
  82                 // Should also never happen
  83                 return fqn;
  84             }
  85             return fqn.substring(enclosingFQN.length());
  86         }
  87     }
  88 
  89     /**
  90      * Converts a type name in internal form to an external form.
  91      *
  92      * @param name the internal name to convert
  93      * @param qualified whether the returned name should be qualified with the package name
  94      * @param classForNameCompatible specifies if the returned name for array types should be in
  95      *            {@link Class#forName(String)} format (e.g., {@code "[Ljava.lang.Object;"},
  96      *            {@code "[[I"}) or in Java source code format (e.g., {@code "java.lang.Object[]"},
  97      *            {@code "int[][]"} ).
  98      */
  99     public static String internalNameToJava(String name, boolean qualified, boolean classForNameCompatible) {
 100         switch (name.charAt(0)) {
 101             case 'L': {
 102                 String result = name.substring(1, name.length() - 1).replace('/', '.');
 103                 if (!qualified) {
 104                     final int lastDot = result.lastIndexOf('.');
 105                     if (lastDot != -1) {
 106                         result = result.substring(lastDot + 1);