Source.java revision 2571:10fc81ac75b4 
1/*
2 * Copyright (c) 2002, 2014, 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
26package com.sun.tools.javac.code;
27
28import java.util.*;
29
30import javax.lang.model.SourceVersion;
31import static javax.lang.model.SourceVersion.*;
32
33import com.sun.tools.javac.jvm.Target;
34import com.sun.tools.javac.util.*;
35import static com.sun.tools.javac.main.Option.*;
36
37/** The source language version accepted.
38 *
39 *  <p><b>This is NOT part of any supported API.
40 *  If you write code that depends on this, you do so at your own risk.
41 *  This code and its internal interfaces are subject to change or
42 *  deletion without notice.</b>
43 */
44public enum Source {
45    /** 1.0 had no inner classes, and so could not pass the JCK. */
46    // public static final Source JDK1_0 =              new Source("1.0");
47
48    /** 1.1 did not have strictfp, and so could not pass the JCK. */
49    // public static final Source JDK1_1 =              new Source("1.1");
50
51    /** 1.2 introduced strictfp. */
52    JDK1_2("1.2"),
53
54    /** 1.3 is the same language as 1.2. */
55    JDK1_3("1.3"),
56
57    /** 1.4 introduced assert. */
58    JDK1_4("1.4"),
59
60    /** 1.5 introduced generics, attributes, foreach, boxing, static import,
61     *  covariant return, enums, varargs, et al. */
62    JDK1_5("1.5"),
63
64    /** 1.6 reports encoding problems as errors instead of warnings. */
65    JDK1_6("1.6"),
66
67    /** 1.7 introduced try-with-resources, multi-catch, string switch, etc. */
68    JDK1_7("1.7"),
69
70    /** 1.8 lambda expressions and default methods. */
71    JDK1_8("1.8"),
72
73    /** 1.9 covers the to be determined language features that will be added in JDK 9. */
74    JDK1_9("1.9");
75
76    private static final Context.Key<Source> sourceKey = new Context.Key<>();
77
78    public static Source instance(Context context) {
79        Source instance = context.get(sourceKey);
80        if (instance == null) {
81            Options options = Options.instance(context);
82            String sourceString = options.get(SOURCE);
83            if (sourceString != null) instance = lookup(sourceString);
84            if (instance == null) instance = DEFAULT;
85            context.put(sourceKey, instance);
86        }
87        return instance;
88    }
89
90    public final String name;
91
92    private static final Map<String,Source> tab = new HashMap<>();
93    static {
94        for (Source s : values()) {
95            tab.put(s.name, s);
96        }
97        tab.put("5", JDK1_5); // Make 5 an alias for 1.5
98        tab.put("6", JDK1_6); // Make 6 an alias for 1.6
99        tab.put("7", JDK1_7); // Make 7 an alias for 1.7
100        tab.put("8", JDK1_8); // Make 8 an alias for 1.8
101        tab.put("9", JDK1_9); // Make 9 an alias for 1.9
102    }
103
104    private Source(String name) {
105        this.name = name;
106    }
107
108    public static final Source MIN = Source.JDK1_6;
109
110    private static final Source MAX = values()[values().length - 1];
111
112    public static final Source DEFAULT = MAX;
113
114    public static Source lookup(String name) {
115        return tab.get(name);
116    }
117
118    public Target requiredTarget() {
119        if (this.compareTo(JDK1_9) >= 0) return Target.JDK1_9;
120        if (this.compareTo(JDK1_8) >= 0) return Target.JDK1_8;
121        if (this.compareTo(JDK1_7) >= 0) return Target.JDK1_7;
122        if (this.compareTo(JDK1_6) >= 0) return Target.JDK1_6;
123        if (this.compareTo(JDK1_5) >= 0) return Target.JDK1_5;
124        if (this.compareTo(JDK1_4) >= 0) return Target.JDK1_4;
125        return Target.JDK1_1;
126    }
127
128    public boolean allowDiamond() {
129        return compareTo(JDK1_7) >= 0;
130    }
131    public boolean allowMulticatch() {
132        return compareTo(JDK1_7) >= 0;
133    }
134    public boolean allowImprovedRethrowAnalysis() {
135        return compareTo(JDK1_7) >= 0;
136    }
137    public boolean allowImprovedCatchAnalysis() {
138        return compareTo(JDK1_7) >= 0;
139    }
140    public boolean allowTryWithResources() {
141        return compareTo(JDK1_7) >= 0;
142    }
143    public boolean allowBinaryLiterals() {
144        return compareTo(JDK1_7) >= 0;
145    }
146    public boolean allowUnderscoresInLiterals() {
147        return compareTo(JDK1_7) >= 0;
148    }
149    public boolean allowStringsInSwitch() {
150        return compareTo(JDK1_7) >= 0;
151    }
152    public boolean allowSimplifiedVarargs() {
153        return compareTo(JDK1_7) >= 0;
154    }
155    public boolean allowObjectToPrimitiveCast() {
156        return compareTo(JDK1_7) >= 0;
157    }
158    public boolean enforceThisDotInit() {
159        return compareTo(JDK1_7) >= 0;
160    }
161    public boolean allowPoly() {
162        return compareTo(JDK1_8) >= 0;
163    }
164    public boolean allowLambda() {
165        return compareTo(JDK1_8) >= 0;
166    }
167    public boolean allowMethodReferences() {
168        return compareTo(JDK1_8) >= 0;
169    }
170    public boolean allowDefaultMethods() {
171        return compareTo(JDK1_8) >= 0;
172    }
173    public boolean allowStaticInterfaceMethods() {
174        return compareTo(JDK1_8) >= 0;
175    }
176    public boolean allowStrictMethodClashCheck() {
177        return compareTo(JDK1_8) >= 0;
178    }
179    public boolean allowEffectivelyFinalInInnerClasses() {
180        return compareTo(JDK1_8) >= 0;
181    }
182    public boolean allowTypeAnnotations() {
183        return compareTo(JDK1_8) >= 0;
184    }
185    public boolean allowAnnotationsAfterTypeParams() {
186        return compareTo(JDK1_8) >= 0;
187    }
188    public boolean allowRepeatedAnnotations() {
189        return compareTo(JDK1_8) >= 0;
190    }
191    public boolean allowIntersectionTypesInCast() {
192        return compareTo(JDK1_8) >= 0;
193    }
194    public boolean allowGraphInference() {
195        return compareTo(JDK1_8) >= 0;
196    }
197    public boolean allowFunctionalInterfaceMostSpecific() {
198        return compareTo(JDK1_8) >= 0;
199    }
200    public boolean allowPostApplicabilityVarargsAccessCheck() {
201        return compareTo(JDK1_8) >= 0;
202    }
203    public boolean allowPrivateSafeVarargs() {
204        return compareTo(JDK1_9) >= 0;
205    }
206    public static SourceVersion toSourceVersion(Source source) {
207        switch(source) {
208        case JDK1_2:
209            return RELEASE_2;
210        case JDK1_3:
211            return RELEASE_3;
212        case JDK1_4:
213            return RELEASE_4;
214        case JDK1_5:
215            return RELEASE_5;
216        case JDK1_6:
217            return RELEASE_6;
218        case JDK1_7:
219            return RELEASE_7;
220        case JDK1_8:
221            return RELEASE_8;
222        case JDK1_9:
223            return RELEASE_9;
224        default:
225            return null;
226        }
227    }
228}
229