author | jjg |
Tue, 19 Mar 2013 15:13:44 -0700 | |
changeset 16559 | e927a4e65b0c |
parent 16303 | b5dca0b42963 |
child 20612 | 4761f3ff7afb |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.source.util; |
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|
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import com.sun.source.doctree.*; |
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|
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/** |
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* A TreeVisitor that visits all the child tree nodes. |
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* To visit nodes of a particular type, just override the |
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* corresponding visitXYZ method. |
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* Inside your method, call super.visitXYZ to visit descendant |
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* nodes. |
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* |
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* <p>The default implementation of the visitXYZ methods will determine |
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* a result as follows: |
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* <ul> |
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* <li>If the node being visited has no children, the result will be null. |
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* <li>If the node being visited has one child, the result will be the |
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* result of calling {@code scan} on that child. The child may be a simple node |
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* or itself a list of nodes. |
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* <li> If the node being visited has more than one child, the result will |
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* be determined by calling {@code scan} each child in turn, and then combining the |
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* result of each scan after the first with the cumulative result |
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* so far, as determined by the {@link #reduce} method. Each child may be either |
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* a simple node of a list of nodes. The default behavior of the {@code reduce} |
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* method is such that the result of the visitXYZ method will be the result of |
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* the last child scanned. |
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* </ul> |
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* |
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* <p>Here is an example to count the number of erroneous nodes in a tree: |
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* <pre> |
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* class CountErrors extends DocTreeScanner<Integer,Void> { |
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* {@literal @}Override |
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* public Integer visitErroneous(ErroneousTree node, Void p) { |
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* return 1; |
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* } |
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* {@literal @}Override |
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* public Integer reduce(Integer r1, Integer r2) { |
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* return (r1 == null ? 0 : r1) + (r2 == null ? 0 : r2); |
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* } |
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* } |
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* </pre> |
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* |
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* @since 1.8 |
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*/ |
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@jdk.Supported |
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public class DocTreeScanner<R,P> implements DocTreeVisitor<R,P> { |
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/** |
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* Scan a single node. |
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*/ |
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public R scan(DocTree node, P p) { |
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return (node == null) ? null : node.accept(this, p); |
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} |
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private R scanAndReduce(DocTree node, P p, R r) { |
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return reduce(scan(node, p), r); |
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} |
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/** |
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* Scan a list of nodes. |
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*/ |
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public R scan(Iterable<? extends DocTree> nodes, P p) { |
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R r = null; |
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if (nodes != null) { |
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boolean first = true; |
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for (DocTree node : nodes) { |
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r = (first ? scan(node, p) : scanAndReduce(node, p, r)); |
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first = false; |
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} |
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} |
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return r; |
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} |
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private R scanAndReduce(Iterable<? extends DocTree> nodes, P p, R r) { |
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return reduce(scan(nodes, p), r); |
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} |
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/** |
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* Reduces two results into a combined result. |
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* The default implementation is to return the first parameter. |
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* The general contract of the method is that it may take any action whatsoever. |
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*/ |
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public R reduce(R r1, R r2) { |
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return r1; |
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} |
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/* *************************************************************************** |
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* Visitor methods |
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****************************************************************************/ |
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@Override |
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public R visitAttribute(AttributeTree node, P p) { |
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return null; |
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} |
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@Override |
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public R visitAuthor(AuthorTree node, P p) { |
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return scan(node.getName(), p); |
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} |
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@Override |
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public R visitComment(CommentTree node, P p) { |
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return null; |
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} |
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@Override |
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public R visitDeprecated(DeprecatedTree node, P p) { |
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return scan(node.getBody(), p); |
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} |
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|
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137 |
@Override |
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138 |
public R visitDocComment(DocCommentTree node, P p) { |
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R r = scan(node.getFirstSentence(), p); |
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r = scanAndReduce(node.getBody(), p, r); |
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r = scanAndReduce(node.getBlockTags(), p, r); |
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return r; |
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} |
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144 |
|
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145 |
@Override |
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146 |
public R visitDocRoot(DocRootTree node, P p) { |
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return null; |
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} |
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149 |
|
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150 |
@Override |
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151 |
public R visitEndElement(EndElementTree node, P p) { |
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return null; |
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} |
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154 |
|
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155 |
@Override |
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156 |
public R visitEntity(EntityTree node, P p) { |
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157 |
return null; |
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158 |
} |
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159 |
|
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160 |
@Override |
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161 |
public R visitErroneous(ErroneousTree node, P p) { |
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162 |
return null; |
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163 |
} |
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164 |
|
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165 |
@Override |
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166 |
public R visitIdentifier(IdentifierTree node, P p) { |
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167 |
return null; |
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168 |
} |
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169 |
|
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170 |
@Override |
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171 |
public R visitInheritDoc(InheritDocTree node, P p) { |
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172 |
return null; |
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173 |
} |
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174 |
|
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175 |
@Override |
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176 |
public R visitLink(LinkTree node, P p) { |
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R r = scan(node.getReference(), p); |
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r = scanAndReduce(node.getLabel(), p, r); |
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return r; |
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} |
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|
181 |
|
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182 |
@Override |
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183 |
public R visitLiteral(LiteralTree node, P p) { |
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184 |
return null; |
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|
185 |
} |
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|
186 |
|
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187 |
@Override |
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188 |
public R visitParam(ParamTree node, P p) { |
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|
189 |
R r = scan(node.getName(), p); |
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|
190 |
r = scanAndReduce(node.getDescription(), p, r); |
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|
191 |
return r; |
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|
192 |
} |
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|
193 |
|
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|
194 |
@Override |
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195 |
public R visitReference(ReferenceTree node, P p) { |
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|
196 |
return null; |
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|
197 |
} |
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|
198 |
|
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|
199 |
@Override |
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|
200 |
public R visitReturn(ReturnTree node, P p) { |
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|
201 |
return scan(node.getDescription(), p); |
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|
202 |
} |
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|
203 |
|
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|
204 |
@Override |
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|
205 |
public R visitSee(SeeTree node, P p) { |
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|
206 |
return scan(node.getReference(), p); |
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|
207 |
} |
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|
208 |
|
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|
209 |
@Override |
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|
210 |
public R visitSerial(SerialTree node, P p) { |
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|
211 |
return scan(node.getDescription(), p); |
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|
212 |
} |
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|
213 |
|
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|
214 |
@Override |
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|
215 |
public R visitSerialData(SerialDataTree node, P p) { |
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|
216 |
return scan(node.getDescription(), p); |
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|
217 |
} |
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|
218 |
|
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|
219 |
@Override |
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220 |
public R visitSerialField(SerialFieldTree node, P p) { |
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|
221 |
R r = scan(node.getName(), p); |
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|
222 |
r = scanAndReduce(node.getType(), p, r); |
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|
223 |
r = scanAndReduce(node.getDescription(), p, r); |
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|
224 |
return r; |
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|
225 |
} |
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|
226 |
|
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|
227 |
@Override |
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|
228 |
public R visitSince(SinceTree node, P p) { |
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|
229 |
return scan(node.getBody(), p); |
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|
230 |
} |
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|
231 |
|
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|
232 |
@Override |
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|
233 |
public R visitStartElement(StartElementTree node, P p) { |
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|
234 |
return scan(node.getAttributes(), p); |
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|
235 |
} |
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|
236 |
|
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|
237 |
@Override |
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|
238 |
public R visitText(TextTree node, P p) { |
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|
239 |
return null; |
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|
240 |
} |
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|
241 |
|
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|
242 |
@Override |
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|
243 |
public R visitThrows(ThrowsTree node, P p) { |
36f9d11fc9aa
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|
244 |
R r = scan(node.getExceptionName(), p); |
36f9d11fc9aa
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|
245 |
r = scanAndReduce(node.getDescription(), p, r); |
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|
246 |
return r; |
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changeset
|
247 |
} |
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|
248 |
|
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|
249 |
@Override |
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|
250 |
public R visitUnknownBlockTag(UnknownBlockTagTree node, P p) { |
36f9d11fc9aa
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|
251 |
return scan(node.getContent(), p); |
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|
252 |
} |
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|
253 |
|
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|
254 |
@Override |
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|
255 |
public R visitUnknownInlineTag(UnknownInlineTagTree node, P p) { |
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|
256 |
return scan(node.getContent(), p); |
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|
257 |
} |
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|
258 |
|
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|
259 |
@Override |
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|
260 |
public R visitValue(ValueTree node, P p) { |
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|
261 |
return scan(node.getReference(), p); |
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|
262 |
} |
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|
263 |
|
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|
264 |
@Override |
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|
265 |
public R visitVersion(VersionTree node, P p) { |
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|
266 |
return scan(node.getBody(), p); |
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|
267 |
} |
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|
268 |
|
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@Override |
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public R visitOther(DocTree node, P p) { |
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return null; |
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} |
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} |