src/share/classes/javax/lang/model/util/Elements.java

Tue, 28 Dec 2010 15:54:52 -0800

author
ohair
date
Tue, 28 Dec 2010 15:54:52 -0800
changeset 798
4868a36f6fd8
parent 554
9d9f26857129
child 972
694ff82ca68e
permissions
-rw-r--r--

6962318: Update copyright year
Reviewed-by: xdono

duke@1 1 /*
ohair@554 2 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
duke@1 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@1 4 *
duke@1 5 * This code is free software; you can redistribute it and/or modify it
duke@1 6 * under the terms of the GNU General Public License version 2 only, as
ohair@554 7 * published by the Free Software Foundation. Oracle designates this
duke@1 8 * particular file as subject to the "Classpath" exception as provided
ohair@554 9 * by Oracle in the LICENSE file that accompanied this code.
duke@1 10 *
duke@1 11 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@1 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@1 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@1 14 * version 2 for more details (a copy is included in the LICENSE file that
duke@1 15 * accompanied this code).
duke@1 16 *
duke@1 17 * You should have received a copy of the GNU General Public License version
duke@1 18 * 2 along with this work; if not, write to the Free Software Foundation,
duke@1 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@1 20 *
ohair@554 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@554 22 * or visit www.oracle.com if you need additional information or have any
ohair@554 23 * questions.
duke@1 24 */
duke@1 25
duke@1 26 package javax.lang.model.util;
duke@1 27
duke@1 28
duke@1 29 import java.util.List;
duke@1 30 import java.util.Map;
duke@1 31
duke@1 32 import javax.lang.model.element.*;
duke@1 33 import javax.lang.model.type.*;
duke@1 34
duke@1 35
duke@1 36 /**
duke@1 37 * Utility methods for operating on program elements.
duke@1 38 *
duke@1 39 * <p><b>Compatibility Note:</b> Methods may be added to this interface
duke@1 40 * in future releases of the platform.
duke@1 41 *
duke@1 42 * @author Joseph D. Darcy
duke@1 43 * @author Scott Seligman
duke@1 44 * @author Peter von der Ah&eacute;
duke@1 45 * @see javax.annotation.processing.ProcessingEnvironment#getElementUtils
duke@1 46 * @since 1.6
duke@1 47 */
duke@1 48 public interface Elements {
duke@1 49
duke@1 50 /**
duke@1 51 * Returns a package given its fully qualified name.
duke@1 52 *
duke@1 53 * @param name fully qualified package name, or "" for an unnamed package
duke@1 54 * @return the named package, or {@code null} if it cannot be found
duke@1 55 */
duke@1 56 PackageElement getPackageElement(CharSequence name);
duke@1 57
duke@1 58 /**
duke@1 59 * Returns a type element given its canonical name.
duke@1 60 *
duke@1 61 * @param name the canonical name
duke@1 62 * @return the named type element, or {@code null} if it cannot be found
duke@1 63 */
duke@1 64 TypeElement getTypeElement(CharSequence name);
duke@1 65
duke@1 66 /**
duke@1 67 * Returns the values of an annotation's elements, including defaults.
duke@1 68 *
duke@1 69 * @see AnnotationMirror#getElementValues()
duke@1 70 * @param a annotation to examine
duke@1 71 * @return the values of the annotation's elements, including defaults
duke@1 72 */
duke@1 73 Map<? extends ExecutableElement, ? extends AnnotationValue>
duke@1 74 getElementValuesWithDefaults(AnnotationMirror a);
duke@1 75
duke@1 76 /**
duke@1 77 * Returns the text of the documentation (&quot;Javadoc&quot;)
duke@1 78 * comment of an element.
duke@1 79 *
darcy@425 80 * <p> A documentation comment of an element is a comment that
darcy@425 81 * begins with "{@code /**}" , ends with a separate
darcy@425 82 * "<code>*&#47</code>", and immediately precedes the element,
darcy@425 83 * ignoring white space. Therefore, a documentation comment
darcy@425 84 * contains at least three"{@code *}" characters. The text
darcy@425 85 * returned for the documentation comment is a processed form of
darcy@425 86 * the comment as it appears in source code. The leading "{@code
darcy@425 87 * /**}" and trailing "<code>*&#47</code>" are removed. For lines
darcy@425 88 * of the comment starting after the initial "{@code /**}",
darcy@425 89 * leading white space characters are discarded as are any
darcy@425 90 * consecutive "{@code *}" characters appearing after the white
darcy@425 91 * space or starting the line. The processed lines are then
darcy@425 92 * concatenated together (including line terminators) and
darcy@425 93 * returned.
darcy@425 94 *
duke@1 95 * @param e the element being examined
duke@1 96 * @return the documentation comment of the element, or {@code null}
duke@1 97 * if there is none
darcy@425 98 * @jls3 3.6 White Space
duke@1 99 */
duke@1 100 String getDocComment(Element e);
duke@1 101
duke@1 102 /**
duke@1 103 * Returns {@code true} if the element is deprecated, {@code false} otherwise.
duke@1 104 *
duke@1 105 * @param e the element being examined
duke@1 106 * @return {@code true} if the element is deprecated, {@code false} otherwise
duke@1 107 */
duke@1 108 boolean isDeprecated(Element e);
duke@1 109
duke@1 110 /**
duke@1 111 * Returns the <i>binary name</i> of a type element.
duke@1 112 *
duke@1 113 * @param type the type element being examined
duke@1 114 * @return the binary name
duke@1 115 *
duke@1 116 * @see TypeElement#getQualifiedName
duke@1 117 * @jls3 13.1 The Form of a Binary
duke@1 118 */
duke@1 119 Name getBinaryName(TypeElement type);
duke@1 120
duke@1 121
duke@1 122 /**
duke@1 123 * Returns the package of an element. The package of a package is
duke@1 124 * itself.
duke@1 125 *
duke@1 126 * @param type the element being examined
duke@1 127 * @return the package of an element
duke@1 128 */
duke@1 129 PackageElement getPackageOf(Element type);
duke@1 130
duke@1 131 /**
duke@1 132 * Returns all members of a type element, whether inherited or
duke@1 133 * declared directly. For a class the result also includes its
duke@1 134 * constructors, but not local or anonymous classes.
duke@1 135 *
duke@1 136 * <p>Note that elements of certain kinds can be isolated using
duke@1 137 * methods in {@link ElementFilter}.
duke@1 138 *
duke@1 139 * @param type the type being examined
duke@1 140 * @return all members of the type
duke@1 141 * @see Element#getEnclosedElements
duke@1 142 */
duke@1 143 List<? extends Element> getAllMembers(TypeElement type);
duke@1 144
duke@1 145 /**
duke@1 146 * Returns all annotations of an element, whether
duke@1 147 * inherited or directly present.
duke@1 148 *
duke@1 149 * @param e the element being examined
duke@1 150 * @return all annotations of the element
duke@1 151 * @see Element#getAnnotationMirrors
duke@1 152 */
duke@1 153 List<? extends AnnotationMirror> getAllAnnotationMirrors(Element e);
duke@1 154
duke@1 155 /**
duke@1 156 * Tests whether one type, method, or field hides another.
duke@1 157 *
duke@1 158 * @param hider the first element
duke@1 159 * @param hidden the second element
duke@1 160 * @return {@code true} if and only if the first element hides
duke@1 161 * the second
duke@1 162 */
duke@1 163 boolean hides(Element hider, Element hidden);
duke@1 164
duke@1 165 /**
duke@1 166 * Tests whether one method, as a member of a given type,
duke@1 167 * overrides another method.
duke@1 168 * When a non-abstract method overrides an abstract one, the
duke@1 169 * former is also said to <i>implement</i> the latter.
duke@1 170 *
duke@1 171 * <p> In the simplest and most typical usage, the value of the
duke@1 172 * {@code type} parameter will simply be the class or interface
duke@1 173 * directly enclosing {@code overrider} (the possibly-overriding
duke@1 174 * method). For example, suppose {@code m1} represents the method
duke@1 175 * {@code String.hashCode} and {@code m2} represents {@code
duke@1 176 * Object.hashCode}. We can then ask whether {@code m1} overrides
duke@1 177 * {@code m2} within the class {@code String} (it does):
duke@1 178 *
duke@1 179 * <blockquote>
duke@1 180 * {@code assert elements.overrides(m1, m2,
duke@1 181 * elements.getTypeElement("java.lang.String")); }
duke@1 182 * </blockquote>
duke@1 183 *
duke@1 184 * A more interesting case can be illustrated by the following example
duke@1 185 * in which a method in type {@code A} does not override a
duke@1 186 * like-named method in type {@code B}:
duke@1 187 *
duke@1 188 * <blockquote>
duke@1 189 * {@code class A { public void m() {} } }<br>
duke@1 190 * {@code interface B { void m(); } }<br>
duke@1 191 * ...<br>
duke@1 192 * {@code m1 = ...; // A.m }<br>
duke@1 193 * {@code m2 = ...; // B.m }<br>
duke@1 194 * {@code assert ! elements.overrides(m1, m2,
duke@1 195 * elements.getTypeElement("A")); }
duke@1 196 * </blockquote>
duke@1 197 *
duke@1 198 * When viewed as a member of a third type {@code C}, however,
duke@1 199 * the method in {@code A} does override the one in {@code B}:
duke@1 200 *
duke@1 201 * <blockquote>
duke@1 202 * {@code class C extends A implements B {} }<br>
duke@1 203 * ...<br>
duke@1 204 * {@code assert elements.overrides(m1, m2,
duke@1 205 * elements.getTypeElement("C")); }
duke@1 206 * </blockquote>
duke@1 207 *
duke@1 208 * @param overrider the first method, possible overrider
duke@1 209 * @param overridden the second method, possibly being overridden
duke@1 210 * @param type the type of which the first method is a member
duke@1 211 * @return {@code true} if and only if the first method overrides
duke@1 212 * the second
duke@1 213 * @jls3 8.4.8 Inheritance, Overriding, and Hiding
duke@1 214 * @jls3 9.4.1 Inheritance and Overriding
duke@1 215 */
duke@1 216 boolean overrides(ExecutableElement overrider, ExecutableElement overridden,
duke@1 217 TypeElement type);
duke@1 218
duke@1 219 /**
duke@1 220 * Returns the text of a <i>constant expression</i> representing a
duke@1 221 * primitive value or a string.
duke@1 222 * The text returned is in a form suitable for representing the value
duke@1 223 * in source code.
duke@1 224 *
duke@1 225 * @param value a primitive value or string
duke@1 226 * @return the text of a constant expression
duke@1 227 * @throws IllegalArgumentException if the argument is not a primitive
duke@1 228 * value or string
duke@1 229 *
duke@1 230 * @see VariableElement#getConstantValue()
duke@1 231 */
duke@1 232 String getConstantExpression(Object value);
duke@1 233
duke@1 234 /**
duke@1 235 * Prints a representation of the elements to the given writer in
duke@1 236 * the specified order. The main purpose of this method is for
duke@1 237 * diagnostics. The exact format of the output is <em>not</em>
duke@1 238 * specified and is subject to change.
duke@1 239 *
duke@1 240 * @param w the writer to print the output to
duke@1 241 * @param elements the elements to print
duke@1 242 */
duke@1 243 void printElements(java.io.Writer w, Element... elements);
duke@1 244
duke@1 245 /**
duke@1 246 * Return a name with the same sequence of characters as the
duke@1 247 * argument.
duke@1 248 *
duke@1 249 * @param cs the character sequence to return as a name
duke@1 250 */
duke@1 251 Name getName(CharSequence cs);
duke@1 252 }

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