1 /* 2 * Copyright (c) 2002, 2018, 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 com.sun.tools.javac.code; 27 28 import java.util.*; 29 30 import javax.lang.model.SourceVersion; 31 import static javax.lang.model.SourceVersion.*; 32 33 import com.sun.tools.javac.jvm.Target; 34 import com.sun.tools.javac.resources.CompilerProperties.Errors; 35 import com.sun.tools.javac.resources.CompilerProperties.Fragments; 36 import com.sun.tools.javac.util.*; 37 import com.sun.tools.javac.util.JCDiagnostic.Error; 38 import com.sun.tools.javac.util.JCDiagnostic.Fragment; 39 40 import static com.sun.tools.javac.main.Option.*; 41 42 /** The source language version accepted. 43 * 44 * <p><b>This is NOT part of any supported API. 45 * If you write code that depends on this, you do so at your own risk. 46 * This code and its internal interfaces are subject to change or 47 * deletion without notice.</b> 48 */ 49 public enum Source { 50 /** 1.0 had no inner classes, and so could not pass the JCK. */ 51 // public static final Source JDK1_0 = new Source("1.0"); 52 53 /** 1.1 did not have strictfp, and so could not pass the JCK. */ 54 // public static final Source JDK1_1 = new Source("1.1"); 55 56 /** 1.2 introduced strictfp. */ 57 JDK1_2("1.2"), 58 59 /** 1.3 is the same language as 1.2. */ 60 JDK1_3("1.3"), 61 62 /** 1.4 introduced assert. */ 63 JDK1_4("1.4"), 64 65 /** 1.5 introduced generics, attributes, foreach, boxing, static import, 66 * covariant return, enums, varargs, et al. */ 67 JDK5("5"), 68 69 /** 1.6 reports encoding problems as errors instead of warnings. */ 70 JDK6("6"), 71 72 /** 1.7 introduced try-with-resources, multi-catch, string switch, etc. */ 73 JDK7("7"), 74 75 /** 1.8 lambda expressions and default methods. */ 76 JDK8("8"), 77 78 /** 1.9 modularity. */ 79 JDK9("9"), 80 81 /** 1.10 local-variable type inference (var). */ 82 JDK10("10"), 83 84 /** 1.11 local-variable syntax for lambda parameters */ 85 JDK11("11"), 86 87 /** 12 covers the to be determined language features that will be added in JDK 12. */ 88 JDK12("12"); 89 90 private static final Context.Key<Source> sourceKey = new Context.Key<>(); 91 92 public static Source instance(Context context) { 93 Source instance = context.get(sourceKey); 94 if (instance == null) { 95 Options options = Options.instance(context); 96 String sourceString = options.get(SOURCE); 97 if (sourceString != null) instance = lookup(sourceString); 98 if (instance == null) instance = DEFAULT; 99 context.put(sourceKey, instance); 100 } 101 return instance; 102 } 103 104 public final String name; 105 106 private static final Map<String,Source> tab = new HashMap<>(); 107 static { 108 for (Source s : values()) { 109 tab.put(s.name, s); 110 } 111 tab.put("1.5", JDK5); // Make 5 an alias for 1.5 112 tab.put("1.6", JDK6); // Make 6 an alias for 1.6 113 tab.put("1.7", JDK7); // Make 7 an alias for 1.7 114 tab.put("1.8", JDK8); // Make 8 an alias for 1.8 115 tab.put("1.9", JDK9); // Make 9 an alias for 1.9 116 tab.put("1.10", JDK10); // Make 10 an alias for 1.10 117 // Decline to make 1.11 an alias for 11. 118 } 119 120 private Source(String name) { 121 this.name = name; 122 } 123 124 public static final Source MIN = Source.JDK7; 125 126 private static final Source MAX = values()[values().length - 1]; 127 128 public static final Source DEFAULT = MAX; 129 130 public static Source lookup(String name) { 131 return tab.get(name); 132 } 133 134 public boolean isSupported() { 135 return this.compareTo(MIN) >= 0; 136 } 137 138 public Target requiredTarget() { 139 if (this.compareTo(JDK12) >= 0) return Target.JDK1_12; 140 if (this.compareTo(JDK11) >= 0) return Target.JDK1_11; 141 if (this.compareTo(JDK10) >= 0) return Target.JDK1_10; 142 if (this.compareTo(JDK9) >= 0) return Target.JDK1_9; 143 if (this.compareTo(JDK8) >= 0) return Target.JDK1_8; 144 if (this.compareTo(JDK7) >= 0) return Target.JDK1_7; 145 if (this.compareTo(JDK6) >= 0) return Target.JDK1_6; 146 if (this.compareTo(JDK5) >= 0) return Target.JDK1_5; 147 if (this.compareTo(JDK1_4) >= 0) return Target.JDK1_4; 148 return Target.JDK1_1; 149 } 150 151 /** 152 * Models a feature of the Java programming language. Each feature can be associated with a 153 * minimum source level, a maximum source level and a diagnostic fragment describing the feature, 154 * which is used to generate error messages of the kind {@code feature XYZ not supported in source N}. 155 */ 156 public enum Feature { 157 158 DIAMOND(JDK7, Fragments.FeatureDiamond, DiagKind.NORMAL), 159 MODULES(JDK9, Fragments.FeatureModules, DiagKind.PLURAL), 160 EFFECTIVELY_FINAL_VARIABLES_IN_TRY_WITH_RESOURCES(JDK9, Fragments.FeatureVarInTryWithResources, DiagKind.PLURAL), 161 DEPRECATION_ON_IMPORT(MIN, JDK8), 162 POLY(JDK8), 163 LAMBDA(JDK8, Fragments.FeatureLambda, DiagKind.PLURAL), 164 METHOD_REFERENCES(JDK8, Fragments.FeatureMethodReferences, DiagKind.PLURAL), 165 DEFAULT_METHODS(JDK8, Fragments.FeatureDefaultMethods, DiagKind.PLURAL), 166 STATIC_INTERFACE_METHODS(JDK8, Fragments.FeatureStaticIntfMethods, DiagKind.PLURAL), 167 STATIC_INTERFACE_METHODS_INVOKE(JDK8, Fragments.FeatureStaticIntfMethodInvoke, DiagKind.PLURAL), 168 STRICT_METHOD_CLASH_CHECK(JDK8), 169 EFFECTIVELY_FINAL_IN_INNER_CLASSES(JDK8), 170 TYPE_ANNOTATIONS(JDK8, Fragments.FeatureTypeAnnotations, DiagKind.PLURAL), 171 ANNOTATIONS_AFTER_TYPE_PARAMS(JDK8, Fragments.FeatureAnnotationsAfterTypeParams, DiagKind.PLURAL), 172 REPEATED_ANNOTATIONS(JDK8, Fragments.FeatureRepeatableAnnotations, DiagKind.PLURAL), 173 INTERSECTION_TYPES_IN_CAST(JDK8, Fragments.FeatureIntersectionTypesInCast, DiagKind.PLURAL), 174 GRAPH_INFERENCE(JDK8), 175 FUNCTIONAL_INTERFACE_MOST_SPECIFIC(JDK8), 176 POST_APPLICABILITY_VARARGS_ACCESS_CHECK(JDK8), 177 MAP_CAPTURES_TO_BOUNDS(MIN, JDK7), 178 PRIVATE_SAFE_VARARGS(JDK9), 179 DIAMOND_WITH_ANONYMOUS_CLASS_CREATION(JDK9, Fragments.FeatureDiamondAndAnonClass, DiagKind.NORMAL), 180 UNDERSCORE_IDENTIFIER(MIN, JDK8), 181 PRIVATE_INTERFACE_METHODS(JDK9, Fragments.FeaturePrivateIntfMethods, DiagKind.PLURAL), 182 LOCAL_VARIABLE_TYPE_INFERENCE(JDK10), 183 IMPORT_ON_DEMAND_OBSERVABLE_PACKAGES(JDK1_2, JDK8); 184 185 enum DiagKind { 186 NORMAL, 187 PLURAL; 188 } 189 190 private final Source minLevel; 191 private final Source maxLevel; 192 private final Fragment optFragment; 193 private final DiagKind optKind; 194 195 Feature(Source minLevel) { 196 this(minLevel, null, null); 197 } 198 199 Feature(Source minLevel, Fragment optFragment, DiagKind optKind) { 200 this(minLevel, MAX, optFragment, optKind); 201 } 202 203 Feature(Source minLevel, Source maxLevel) { 204 this(minLevel, maxLevel, null, null); 205 } 206 207 Feature(Source minLevel, Source maxLevel, Fragment optFragment, DiagKind optKind) { 208 this.minLevel = minLevel; 209 this.maxLevel = maxLevel; 210 this.optFragment = optFragment; 211 this.optKind = optKind; 212 } 213 214 public boolean allowedInSource(Source source) { 215 return source.compareTo(minLevel) >= 0 && 216 source.compareTo(maxLevel) <= 0; 217 } 218 219 public boolean isPlural() { 220 Assert.checkNonNull(optKind); 221 return optKind == DiagKind.PLURAL; 222 } 223 224 public Fragment nameFragment() { 225 Assert.checkNonNull(optFragment); 226 return optFragment; 227 } 228 229 public Fragment fragment(String sourceName) { 230 Assert.checkNonNull(optFragment); 231 return optKind == DiagKind.NORMAL ? 232 Fragments.FeatureNotSupportedInSource(optFragment, sourceName, minLevel.name) : 233 Fragments.FeatureNotSupportedInSourcePlural(optFragment, sourceName, minLevel.name); 234 } 235 236 public Error error(String sourceName) { 237 Assert.checkNonNull(optFragment); 238 return optKind == DiagKind.NORMAL ? 239 Errors.FeatureNotSupportedInSource(optFragment, sourceName, minLevel.name) : 240 Errors.FeatureNotSupportedInSourcePlural(optFragment, sourceName, minLevel.name); 241 } 242 } 243 244 public static SourceVersion toSourceVersion(Source source) { 245 switch(source) { 246 case JDK1_2: 247 return RELEASE_2; 248 case JDK1_3: 249 return RELEASE_3; 250 case JDK1_4: 251 return RELEASE_4; 252 case JDK5: 253 return RELEASE_5; 254 case JDK6: 255 return RELEASE_6; 256 case JDK7: 257 return RELEASE_7; 258 case JDK8: 259 return RELEASE_8; 260 case JDK9: 261 return RELEASE_9; 262 case JDK10: 263 return RELEASE_10; 264 case JDK11: 265 return RELEASE_11; 266 case JDK12: 267 return RELEASE_12; 268 default: 269 return null; 270 } 271 } 272 }