1 /* 2 * Copyright (c) 2009, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.internal.module; 27 28 public final class Checks { 29 30 private Checks() { } 31 32 private static void fail(String what, String id, int i) { 33 throw new IllegalArgumentException(id 34 + ": Invalid " + what + ": " 35 + " Illegal character" 36 + " at index " + i); 37 } 38 39 /** 40 * Returns {@code true} if the given identifier is a legal Java identifier. 41 */ 42 public static boolean isJavaIdentifier(String id) { 43 int n = id.length(); 44 if (n == 0) 45 return false; 46 if (!Character.isJavaIdentifierStart(id.codePointAt(0))) 47 return false; 48 int cp = id.codePointAt(0); 49 int i = Character.charCount(cp); 50 for (; i < n; i += Character.charCount(cp)) { 51 cp = id.codePointAt(i); 52 if (!Character.isJavaIdentifierPart(cp) && id.charAt(i) != '.') 53 return false; 54 } 55 if (cp == '.') 56 return false; 57 58 return true; 59 } 60 61 /** 62 * Checks if a given identifier is a legal Java identifier. 63 */ 64 public static String requireJavaIdentifier(String what, String id) { 65 if (id == null) 66 throw new IllegalArgumentException("Null " + what); 67 int n = id.length(); 68 if (n == 0) 69 throw new IllegalArgumentException("Empty " + what); 70 if (!Character.isJavaIdentifierStart(id.codePointAt(0))) 71 fail(what, id, 0); 72 int cp = id.codePointAt(0); 73 int i = Character.charCount(cp); 74 int last = 0; 75 for (; i < n; i += Character.charCount(cp)) { 76 cp = id.codePointAt(i); 77 if (!Character.isJavaIdentifierPart(cp) && id.charAt(i) != '.') 78 fail(what, id, i); 79 last = i; 80 } 81 if (cp == '.') 82 fail(what, id, last); 83 84 return id; 85 } 86 87 public static String requireModuleName(String id) { 88 return requireJavaIdentifier("module name", id); 89 } 90 91 public static String requirePackageName(String id) { 92 return requireJavaIdentifier("package name", id); 93 } 94 95 public static String requireServiceTypeName(String id) { 96 return requireJavaIdentifier("service type name", id); 97 } 98 99 public static String requireServiceProviderName(String id) { 100 return requireJavaIdentifier("service provider name", id); 101 } 102 103 }