TypePrinter.java revision 3062:15bdc18525ff 
1/*
2 * Copyright (c) 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
26package jdk.jshell;
27
28import static com.sun.tools.javac.code.Flags.COMPOUND;
29import static com.sun.tools.javac.code.Kinds.Kind.PCK;
30import com.sun.tools.javac.code.Printer;
31import com.sun.tools.javac.code.Symbol;
32import com.sun.tools.javac.code.Symbol.ClassSymbol;
33import com.sun.tools.javac.code.Symbol.PackageSymbol;
34import com.sun.tools.javac.code.Type;
35import com.sun.tools.javac.code.Type.ClassType;
36import com.sun.tools.javac.util.JavacMessages;
37import java.util.Locale;
38import java.util.function.BinaryOperator;
39
40/**
41 * Print types in source form.
42 */
43class TypePrinter extends Printer {
44
45    private final JavacMessages messages;
46    private final BinaryOperator<String> fullClassNameAndPackageToClass;
47    private final Type typeToPrint;
48
49    TypePrinter(JavacMessages messages, BinaryOperator<String> fullClassNameAndPackageToClass, Type typeToPrint) {
50        this.messages = messages;
51        this.fullClassNameAndPackageToClass = fullClassNameAndPackageToClass;
52        this.typeToPrint = typeToPrint;
53    }
54
55    @Override
56    protected String localize(Locale locale, String key, Object... args) {
57        return messages.getLocalizedString(locale, key, args);
58    }
59
60    @Override
61    protected String capturedVarId(Type.CapturedType t, Locale locale) {
62        throw new InternalError("should never call this");
63    }
64
65    @Override
66    public String visitCapturedType(Type.CapturedType t, Locale locale) {
67        if (t == typeToPrint) {
68            return visit(t.getUpperBound(), locale);
69        } else {
70            return visit(t.wildcard, locale);
71        }
72    }
73
74    @Override
75    public String visitType(Type t, Locale locale) {
76        String s = (t.tsym == null || t.tsym.name == null)
77                ? "Object" // none
78                : t.tsym.name.toString();
79        return s;
80    }
81
82    /**
83     * Converts a class name into a (possibly localized) string. Anonymous
84     * inner classes get converted into a localized string.
85     *
86     * @param t the type of the class whose name is to be rendered
87     * @param longform if set, the class' fullname is displayed - if unset the
88     * short name is chosen (w/o package)
89     * @param locale the locale in which the string is to be rendered
90     * @return localized string representation
91     */
92    @Override
93    protected String className(ClassType t, boolean longform, Locale locale) {
94        Symbol sym = t.tsym;
95        if (sym.name.length() == 0 && (sym.flags() & COMPOUND) != 0) {
96            /***
97            StringBuilder s = new StringBuilder(visit(t.supertype_field, locale));
98            for (List<Type> is = t.interfaces_field; is.nonEmpty(); is = is.tail) {
99                s.append('&');
100                s.append(visit(is.head, locale));
101            }
102            return s.toString();
103            ***/
104            return "Object";
105        } else if (sym.name.length() == 0) {
106            // Anonymous
107            String s;
108            ClassType norm = (ClassType) t.tsym.type;
109            if (norm == null) {
110                s = "object";
111            } else if (norm.interfaces_field != null && norm.interfaces_field.nonEmpty()) {
112                s = visit(norm.interfaces_field.head, locale);
113            } else {
114                s = visit(norm.supertype_field, locale);
115            }
116            return s;
117        } else if (longform) {
118            String pkg = "";
119            for (Symbol psym = sym; psym != null; psym = psym.owner) {
120                if (psym.kind == PCK) {
121                    pkg = psym.getQualifiedName().toString();
122                    break;
123                }
124            }
125            return fullClassNameAndPackageToClass.apply(
126                    sym.getQualifiedName().toString(),
127                    pkg
128            );
129        } else {
130            return sym.name.toString();
131        }
132    }
133
134    @Override
135    public String visitClassSymbol(ClassSymbol sym, Locale locale) {
136        return sym.name.isEmpty()
137                ? sym.flatname.toString() // Anonymous
138                : sym.fullname.toString();
139    }
140
141    @Override
142    public String visitPackageSymbol(PackageSymbol s, Locale locale) {
143        return s.isUnnamed()
144                ? ""   // Unnamed package
145                : s.fullname.toString();
146    }
147
148}
149