| /* |
| * Copyright (c) 2009, 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 jdk.internal.module; |
| |
| import java.util.Set; |
| |
| /** |
| * Utility class for checking module, package, and class names. |
| */ |
| |
| public final class Checks { |
| |
| private Checks() { } |
| |
| /** |
| * Checks a name to ensure that it's a legal module name. |
| * |
| * @throws IllegalArgumentException if name is null or not a legal |
| * module name |
| */ |
| public static String requireModuleName(String name) { |
| if (name == null) |
| throw new IllegalArgumentException("Null module name"); |
| int next; |
| int off = 0; |
| while ((next = name.indexOf('.', off)) != -1) { |
| String id = name.substring(off, next); |
| if (!isJavaIdentifier(id)) { |
| throw new IllegalArgumentException(name + ": Invalid module name" |
| + ": '" + id + "' is not a Java identifier"); |
| } |
| off = next+1; |
| } |
| String last = name.substring(off); |
| if (!isJavaIdentifier(last)) { |
| throw new IllegalArgumentException(name + ": Invalid module name" |
| + ": '" + last + "' is not a Java identifier"); |
| } |
| return name; |
| } |
| |
| /** |
| * Checks a name to ensure that it's a legal package name. |
| * |
| * @throws IllegalArgumentException if name is null or not a legal |
| * package name |
| */ |
| public static String requirePackageName(String name) { |
| return requireTypeName("package name", name); |
| } |
| |
| /** |
| * Returns {@code true} if the given name is a legal package name. |
| */ |
| public static boolean isPackageName(String name) { |
| return isTypeName(name); |
| } |
| |
| /** |
| * Checks a name to ensure that it's a legal qualified class name |
| * |
| * @throws IllegalArgumentException if name is null or not a legal |
| * qualified class name |
| */ |
| public static String requireServiceTypeName(String name) { |
| return requireQualifiedClassName("service type name", name); |
| } |
| |
| /** |
| * Checks a name to ensure that it's a legal qualified class name. |
| * |
| * @throws IllegalArgumentException if name is null or not a legal |
| * qualified class name |
| */ |
| public static String requireServiceProviderName(String name) { |
| return requireQualifiedClassName("service provider name", name); |
| } |
| |
| /** |
| * Checks a name to ensure that it's a legal qualified class name in |
| * a named package. |
| * |
| * @throws IllegalArgumentException if name is null or not a legal |
| * qualified class name in a named package |
| */ |
| public static String requireQualifiedClassName(String what, String name) { |
| requireTypeName(what, name); |
| if (name.indexOf('.') == -1) |
| throw new IllegalArgumentException(name + ": is not a qualified name of" |
| + " a Java class in a named package"); |
| return name; |
| } |
| |
| /** |
| * Returns {@code true} if the given name is a legal class name. |
| */ |
| public static boolean isClassName(String name) { |
| return isTypeName(name); |
| } |
| |
| /** |
| * Returns {@code true} if the given name is a legal type name. |
| */ |
| private static boolean isTypeName(String name) { |
| int next; |
| int off = 0; |
| while ((next = name.indexOf('.', off)) != -1) { |
| String id = name.substring(off, next); |
| if (!isJavaIdentifier(id)) |
| return false; |
| off = next+1; |
| } |
| String last = name.substring(off); |
| return isJavaIdentifier(last); |
| } |
| |
| /** |
| * Checks if the given name is a legal type name. |
| * |
| * @throws IllegalArgumentException if name is null or not a legal |
| * type name |
| */ |
| private static String requireTypeName(String what, String name) { |
| if (name == null) |
| throw new IllegalArgumentException("Null " + what); |
| int next; |
| int off = 0; |
| while ((next = name.indexOf('.', off)) != -1) { |
| String id = name.substring(off, next); |
| if (!isJavaIdentifier(id)) { |
| throw new IllegalArgumentException(name + ": Invalid " + what |
| + ": '" + id + "' is not a Java identifier"); |
| } |
| off = next + 1; |
| } |
| String last = name.substring(off); |
| if (!isJavaIdentifier(last)) { |
| throw new IllegalArgumentException(name + ": Invalid " + what |
| + ": '" + last + "' is not a Java identifier"); |
| } |
| return name; |
| } |
| |
| /** |
| * Returns true if the given string is a legal Java identifier, |
| * otherwise false. |
| */ |
| private static boolean isJavaIdentifier(String str) { |
| if (str.isEmpty() || RESERVED.contains(str)) |
| return false; |
| |
| int first = Character.codePointAt(str, 0); |
| if (!Character.isJavaIdentifierStart(first)) |
| return false; |
| |
| int i = Character.charCount(first); |
| while (i < str.length()) { |
| int cp = Character.codePointAt(str, i); |
| if (!Character.isJavaIdentifierPart(cp)) |
| return false; |
| i += Character.charCount(cp); |
| } |
| |
| return true; |
| } |
| |
| // keywords, boolean and null literals, not allowed in identifiers |
| private static final Set<String> RESERVED = Set.of( |
| "abstract", |
| "assert", |
| "boolean", |
| "break", |
| "byte", |
| "case", |
| "catch", |
| "char", |
| "class", |
| "const", |
| "continue", |
| "default", |
| "do", |
| "double", |
| "else", |
| "enum", |
| "extends", |
| "final", |
| "finally", |
| "float", |
| "for", |
| "goto", |
| "if", |
| "implements", |
| "import", |
| "instanceof", |
| "int", |
| "interface", |
| "long", |
| "native", |
| "new", |
| "package", |
| "private", |
| "protected", |
| "public", |
| "return", |
| "short", |
| "static", |
| "strictfp", |
| "super", |
| "switch", |
| "synchronized", |
| "this", |
| "throw", |
| "throws", |
| "transient", |
| "try", |
| "void", |
| "volatile", |
| "while", |
| "true", |
| "false", |
| "null", |
| "_" |
| ); |
| } |