DocFinder.java revision 3692:87b48a8fb3cf
1/* 2 * Copyright (c) 2003, 2016, 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.javadoc.internal.doclets.toolkit.util; 27 28import java.util.*; 29 30import javax.lang.model.element.Element; 31import javax.lang.model.element.ExecutableElement; 32import javax.lang.model.element.TypeElement; 33import javax.lang.model.type.TypeMirror; 34 35import com.sun.source.doctree.DocTree; 36import jdk.javadoc.internal.doclets.toolkit.Configuration; 37import jdk.javadoc.internal.doclets.toolkit.taglets.InheritableTaglet; 38 39/** 40 * Search for the requested documentation. Inherit documentation if necessary. 41 * 42 * <p><b>This is NOT part of any supported API. 43 * If you write code that depends on this, you do so at your own risk. 44 * This code and its internal interfaces are subject to change or 45 * deletion without notice.</b> 46 * 47 * @author Jamie Ho 48 */ 49public class DocFinder { 50 51 public static final class DocTreeInfo { 52 public final DocTree docTree; 53 public final Element element; 54 55 public DocTreeInfo() { 56 this.docTree = null; 57 this.element = null; 58 } 59 60 public DocTreeInfo(DocTree docTree, Element baseElement) { 61 this.docTree = docTree; 62 this.element = baseElement; 63 } 64 65 @Override 66 public String toString() { 67 return "DocTreeInfo{" + "docTree=" + docTree + ", element=" + element + '}'; 68 } 69 } 70 71 /** 72 * The class that encapsulates the input. 73 */ 74 public static class Input { 75 /** 76 * The element to search documentation from. 77 */ 78 public Element element; 79 /** 80 * The taglet to search for documentation on behalf of. Null if we want 81 * to search for overall documentation. 82 */ 83 public InheritableTaglet taglet = null; 84 85 /** 86 * The id of the tag to retrieve documentation for. 87 */ 88 public String tagId = null; 89 90 /** 91 * The tag to retrieve documentation for. This is only used for the 92 * inheritDoc tag. 93 */ 94 public final DocTreeInfo docTreeInfo; 95 96 /** 97 * True if we only want to search for the first sentence. 98 */ 99 public boolean isFirstSentence = false; 100 101 /** 102 * True if we are looking for documentation to replace the inheritDocTag. 103 */ 104 public boolean isInheritDocTag = false; 105 106 /** 107 * Used to distinguish between type variable param tags and regular 108 * param tags. 109 */ 110 public boolean isTypeVariableParamTag = false; 111 112 public final Utils utils; 113 114 public Input(Utils utils, Element element, InheritableTaglet taglet, DocTreeInfo dtInfo, 115 boolean isFirstSentence, boolean isInheritDocTag) { 116 this.utils = utils; 117 this.element = element; 118 this.taglet = taglet; 119 this.isFirstSentence = isFirstSentence; 120 this.isInheritDocTag = isInheritDocTag; 121 this.docTreeInfo = dtInfo; 122 } 123 124 public Input(Utils utils, Element element, InheritableTaglet taglet, String tagId) { 125 this(utils, element); 126 this.taglet = taglet; 127 this.tagId = tagId; 128 } 129 130 public Input(Utils utils, Element element, InheritableTaglet taglet, String tagId, 131 boolean isTypeVariableParamTag) { 132 this(utils, element); 133 this.taglet = taglet; 134 this.tagId = tagId; 135 this.isTypeVariableParamTag = isTypeVariableParamTag; 136 } 137 138 public Input(Utils utils, Element element, InheritableTaglet taglet) { 139 this(utils, element); 140 this.taglet = taglet; 141 } 142 143 public Input(Utils utils, Element element) { 144 if (element == null) 145 throw new NullPointerException(); 146 this.element = element; 147 this.utils = utils; 148 this.docTreeInfo = new DocTreeInfo(); 149 } 150 151 public Input(Utils utils, Element element, boolean isFirstSentence) { 152 this(utils, element); 153 this.isFirstSentence = isFirstSentence; 154 } 155 156 public Input copy(Utils utils) { 157 if (this.element == null) { 158 throw new NullPointerException(); 159 } 160 Input clone = new Input(utils, this.element, this.taglet, this.docTreeInfo, 161 this.isFirstSentence, this.isInheritDocTag); 162 clone.tagId = this.tagId; 163 clone.isTypeVariableParamTag = this.isTypeVariableParamTag; 164 return clone; 165 } 166 167 /** 168 * For debugging purposes 169 * @return string representation 170 */ 171 @Override 172 public String toString() { 173 String encl = element == null ? "" : element.getEnclosingElement().toString() + "::"; 174 return "Input{" + "element=" + encl + element 175 + ", taglet=" + taglet 176 + ", tagId=" + tagId + ", tag=" + docTreeInfo 177 + ", isFirstSentence=" + isFirstSentence 178 + ", isInheritDocTag=" + isInheritDocTag 179 + ", isTypeVariableParamTag=" + isTypeVariableParamTag 180 + ", utils=" + utils + '}'; 181 } 182 } 183 184 /** 185 * The class that encapsulates the output. 186 */ 187 public static class Output { 188 /** 189 * The tag that holds the documentation. Null if documentation 190 * is not held by a tag. 191 */ 192 public DocTree holderTag; 193 194 /** 195 * The Doc object that holds the documentation. 196 */ 197 public Element holder; 198 199 /** 200 * The inherited documentation. 201 */ 202 public List<? extends DocTree> inlineTags = Collections.emptyList(); 203 204 /** 205 * False if documentation could not be inherited. 206 */ 207 public boolean isValidInheritDocTag = true; 208 209 /** 210 * When automatically inheriting throws tags, you sometime must inherit 211 * more than one tag. For example if the element declares that it throws 212 * IOException and the overridden element has throws tags for IOException and 213 * ZipException, both tags would be inherited because ZipException is a 214 * subclass of IOException. This subclass of DocFinder.Output allows 215 * multiple tag inheritence. 216 */ 217 public List<DocTree> tagList = new ArrayList<>(); 218 219 /** 220 * Returns a string representation for debugging purposes 221 * @return string 222 */ 223 @Override 224 public String toString() { 225 String encl = holder == null ? "" : holder.getEnclosingElement().toString() + "::"; 226 return "Output{" + "holderTag=" + holderTag 227 + ", holder=" + encl + holder 228 + ", inlineTags=" + inlineTags 229 + ", isValidInheritDocTag=" + isValidInheritDocTag 230 + ", tagList=" + tagList + '}'; 231 } 232 } 233 234 /** 235 * Search for the requested comments in the given element. If it does not 236 * have comments, return documentation from the overridden element if possible. 237 * If the overridden element does not exist or does not have documentation to 238 * inherit, search for documentation to inherit from implemented methods. 239 * 240 * @param input the input object used to perform the search. 241 * 242 * @return an Output object representing the documentation that was found. 243 */ 244 public static Output search(Configuration configuration, Input input) { 245 Output output = new Output(); 246 Utils utils = configuration.utils; 247 if (input.isInheritDocTag) { 248 //Do nothing because "element" does not have any documentation. 249 //All it has is {@inheritDoc}. 250 } else if (input.taglet == null) { 251 //We want overall documentation. 252 output.inlineTags = input.isFirstSentence 253 ? utils.getFirstSentenceTrees(input.element) 254 : utils.getFullBody(input.element); 255 output.holder = input.element; 256 } else { 257 input.taglet.inherit(input, output); 258 } 259 260 if (output.inlineTags != null && !output.inlineTags.isEmpty()) { 261 return output; 262 } 263 output.isValidInheritDocTag = false; 264 Input inheritedSearchInput = input.copy(configuration.utils); 265 inheritedSearchInput.isInheritDocTag = false; 266 if (utils.isMethod(input.element)) { 267 ExecutableElement overriddenMethod = utils.overriddenMethod((ExecutableElement) input.element); 268 if (overriddenMethod != null) { 269 inheritedSearchInput.element = overriddenMethod; 270 output = search(configuration, inheritedSearchInput); 271 output.isValidInheritDocTag = true; 272 if (!output.inlineTags.isEmpty()) { 273 return output; 274 } 275 } 276 //NOTE: When we fix the bug where ClassDoc.interfaceTypes() does 277 // not pass all implemented interfaces, we will use the 278 // appropriate element here. 279 ImplementedMethods implMethods 280 = new ImplementedMethods((ExecutableElement) input.element, configuration); 281 List<ExecutableElement> implementedMethods = implMethods.build(); 282 for (ExecutableElement implementedMethod : implementedMethods) { 283 inheritedSearchInput.element = implementedMethod; 284 output = search(configuration, inheritedSearchInput); 285 output.isValidInheritDocTag = true; 286 if (!output.inlineTags.isEmpty()) { 287 return output; 288 } 289 } 290 } else if (utils.isTypeElement(input.element)) { 291 TypeMirror t = ((TypeElement) input.element).getSuperclass(); 292 Element superclass = utils.asTypeElement(t); 293 if (superclass != null) { 294 inheritedSearchInput.element = superclass; 295 output = search(configuration, inheritedSearchInput); 296 output.isValidInheritDocTag = true; 297 if (!output.inlineTags.isEmpty()) { 298 return output; 299 } 300 } 301 } 302 return output; 303 } 304} 305