Thu, 18 Apr 2013 20:00:14 -0700
8012656: cache frequently used name strings for DocImpl classes
Reviewed-by: darcy
1 /*
2 * Copyright (c) 1997, 2013, 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 */
26 package com.sun.tools.javadoc;
28 import java.lang.reflect.Modifier;
30 import com.sun.javadoc.*;
31 import com.sun.source.util.TreePath;
32 import com.sun.tools.javac.code.*;
33 import com.sun.tools.javac.code.Symbol.*;
34 import com.sun.tools.javac.code.Type;
35 import static com.sun.tools.javac.code.TypeTag.CLASS;
37 /**
38 * Represents a method of a java class.
39 *
40 * <p><b>This is NOT part of any supported API.
41 * If you write code that depends on this, you do so at your own risk.
42 * This code and its internal interfaces are subject to change or
43 * deletion without notice.</b>
44 *
45 * @since 1.2
46 * @author Robert Field
47 * @author Neal Gafter (rewrite)
48 */
50 public class MethodDocImpl
51 extends ExecutableMemberDocImpl implements MethodDoc {
53 /**
54 * constructor.
55 */
56 public MethodDocImpl(DocEnv env, MethodSymbol sym) {
57 super(env, sym);
58 }
60 /**
61 * constructor.
62 */
63 public MethodDocImpl(DocEnv env, MethodSymbol sym, TreePath treePath) {
64 super(env, sym, treePath);
65 }
67 /**
68 * Return true if it is a method, which it is.
69 * Note: constructors are not methods.
70 * This method is overridden by AnnotationTypeElementDocImpl.
71 *
72 * @return true
73 */
74 public boolean isMethod() {
75 return true;
76 }
78 /**
79 * Return true if this method is default
80 */
81 public boolean isDefault() {
82 return (sym.flags() & Flags.DEFAULT) != 0;
83 }
85 /**
86 * Return true if this method is abstract
87 */
88 public boolean isAbstract() {
89 return (Modifier.isAbstract(getModifiers()) && !isDefault());
90 }
92 /**
93 * Get return type.
94 *
95 * @return the return type of this method, null if it
96 * is a constructor.
97 */
98 public com.sun.javadoc.Type returnType() {
99 return TypeMaker.getType(env, sym.type.getReturnType(), false);
100 }
102 /**
103 * Return the class that originally defined the method that
104 * is overridden by the current definition, or null if no
105 * such class exists.
106 *
107 * @return a ClassDocImpl representing the superclass that
108 * originally defined this method, null if this method does
109 * not override a definition in a superclass.
110 */
111 public ClassDoc overriddenClass() {
112 com.sun.javadoc.Type t = overriddenType();
113 return (t != null) ? t.asClassDoc() : null;
114 }
116 /**
117 * Return the type containing the method that this method overrides.
118 * It may be a <code>ClassDoc</code> or a <code>ParameterizedType</code>.
119 */
120 public com.sun.javadoc.Type overriddenType() {
122 if ((sym.flags() & Flags.STATIC) != 0) {
123 return null;
124 }
126 ClassSymbol origin = (ClassSymbol)sym.owner;
127 for (Type t = env.types.supertype(origin.type);
128 t.hasTag(CLASS);
129 t = env.types.supertype(t)) {
130 ClassSymbol c = (ClassSymbol)t.tsym;
131 for (Scope.Entry e = c.members().lookup(sym.name); e.scope != null; e = e.next()) {
132 if (sym.overrides(e.sym, origin, env.types, true)) {
133 return TypeMaker.getType(env, t);
134 }
135 }
136 }
137 return null;
138 }
140 /**
141 * Return the method that this method overrides.
142 *
143 * @return a MethodDoc representing a method definition
144 * in a superclass this method overrides, null if
145 * this method does not override.
146 */
147 public MethodDoc overriddenMethod() {
149 // Real overriding only. Static members are simply hidden.
150 // Likewise for constructors, but the MethodSymbol.overrides
151 // method takes this into account.
152 if ((sym.flags() & Flags.STATIC) != 0) {
153 return null;
154 }
156 // Derived from com.sun.tools.javac.comp.Check.checkOverride .
158 ClassSymbol origin = (ClassSymbol)sym.owner;
159 for (Type t = env.types.supertype(origin.type);
160 t.hasTag(CLASS);
161 t = env.types.supertype(t)) {
162 ClassSymbol c = (ClassSymbol)t.tsym;
163 for (Scope.Entry e = c.members().lookup(sym.name); e.scope != null; e = e.next()) {
164 if (sym.overrides(e.sym, origin, env.types, true)) {
165 return env.getMethodDoc((MethodSymbol)e.sym);
166 }
167 }
168 }
169 return null;
170 }
172 /**
173 * Tests whether this method overrides another.
174 * The overridden method may be one declared in a superclass or
175 * a superinterface (unlike {@link #overriddenMethod()}).
176 *
177 * <p> When a non-abstract method overrides an abstract one, it is
178 * also said to <i>implement</i> the other.
179 *
180 * @param meth the other method to examine
181 * @return <tt>true</tt> if this method overrides the other
182 */
183 public boolean overrides(MethodDoc meth) {
184 MethodSymbol overridee = ((MethodDocImpl) meth).sym;
185 ClassSymbol origin = (ClassSymbol) sym.owner;
187 return sym.name == overridee.name &&
189 // not reflexive as per JLS
190 sym != overridee &&
192 // we don't care if overridee is static, though that wouldn't
193 // compile
194 !sym.isStatic() &&
196 // sym, whose declaring type is the origin, must be
197 // in a subtype of overridee's type
198 env.types.asSuper(origin.type, overridee.owner) != null &&
200 // check access and signatures; don't check return types
201 sym.overrides(overridee, origin, env.types, false);
202 }
205 public String name() {
206 if (name == null) {
207 name = sym.name.toString();
208 }
209 return name;
210 }
212 private String name;
214 public String qualifiedName() {
215 if (qualifiedName == null) {
216 qualifiedName = sym.enclClass().getQualifiedName() + "." + sym.name;
217 }
218 return qualifiedName;
219 }
221 private String qualifiedName;
223 /**
224 * Returns a string representation of this method. Includes the
225 * qualified signature, the qualified method name, and any type
226 * parameters. Type parameters follow the class name, as they do
227 * in the syntax for invoking methods with explicit type parameters.
228 */
229 public String toString() {
230 return sym.enclClass().getQualifiedName() +
231 "." + typeParametersString() + name() + signature();
232 }
233 }