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185 lines
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185 lines
12 KiB
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<div class="header">
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compact3
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<div class="subTitle">
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javax.lang.model.util
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<h2 class="title" title="Class ElementScanner8">Class ElementScanner8<R,P></h2>
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</div><div class="contentContainer">
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<ul class="inheritance">
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<li><a href="../../../../java/lang/Object.html" title="class in java.lang">java.lang.Object</a></li>
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<li>
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<ul class="inheritance">
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<li><a href="../../../../javax/lang/model/util/AbstractElementVisitor6.html" title="class in javax.lang.model.util">javax.lang.model.util.AbstractElementVisitor6</a><R,P></li>
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<li>
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<ul class="inheritance">
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<li><a href="../../../../javax/lang/model/util/ElementScanner6.html" title="class in javax.lang.model.util">javax.lang.model.util.ElementScanner6</a><R,P></li>
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<li>
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<ul class="inheritance">
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<li><a href="../../../../javax/lang/model/util/ElementScanner7.html" title="class in javax.lang.model.util">javax.lang.model.util.ElementScanner7</a><R,P></li>
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<li>
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<ul class="inheritance">
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<li>javax.lang.model.util.ElementScanner8<R,P></li>
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</ul> </li>
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</ul> </li>
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</ul> </li>
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</ul>
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<div class="description">
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<dl>
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<dt>
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<span class="paramLabel">参数类型</span>
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</dt>
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<dd>
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<span><code>R</code> - 这个访问者的方法的返回类型。</span>
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<span>对不需要返回结果的访问者使用<a href="../../../../java/lang/Void.html" title="java.lang中的类"><code>Void</code></a> 。</span>
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</dd>
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<dd>
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<span><code>P</code> - 此访问者方法的附加参数类型。</span>
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<span>对不需要<code>Void</code>的访问者使用Void。</span>
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</dd>
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</dl>
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<dl>
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<dt>
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All Implemented Interfaces:
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</dt>
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<dd>
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<span><a href="../../../../javax/lang/model/element/ElementVisitor.html" title="javax.lang.model.element中的接口">ElementVisitor</a> <R，P></span>
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</dd>
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</dl>
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<hr/> <br/> <pre><a href="../../../../javax/annotation/processing/SupportedSourceVersion.html" title="annotation in javax.annotation.processing">@SupportedSourceVersion</a>(<a href="../../../../javax/annotation/processing/SupportedSourceVersion.html#value--">value</a>=<a href="../../../../javax/lang/model/SourceVersion.html#RELEASE_8">RELEASE_8</a>)
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public class <span class="typeNameLabel">ElementScanner8<R,P></span>
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extends <a href="../../../../javax/lang/model/util/ElementScanner7.html" title="class in javax.lang.model.util">ElementScanner7</a><R,P></pre>
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<div class="block">
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<span>具有适用于<a href="../../../../javax/lang/model/SourceVersion.html#RELEASE_8"><code>RELEASE_8</code></a>源版本的默认行为的程序元素的扫描访问者。</span>
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<span>所述<tt>visit<i>XYZ</i>种</tt>方法在这个类通过调用扫描其成分元素<code>scan</code>他们<a href="../../../../javax/lang/model/element/Element.html#getEnclosedElements--">enclosed elements</a> ， <a href="../../../../javax/lang/model/element/ExecutableElement.html#getParameters--">parameters</a> ，等等，如在单独的方法规范表示。</span>
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<span>一个子类可以通过覆盖<tt>visit<i>XYZ</i></tt>方法来控制访问的顺序元素。</span>
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<span>请注意，扫描程序的客户端可能会获得所需的行为，而不是在感兴趣的根对象上调用<code>v.scan(e, p)</code>而不是<code>v.visit(e, p)</code> 。</span>
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<p> <span>当一个子类覆盖<tt>visit<i>XYZ</i></tt>方法时，新方法可以通过调用<tt>super.visit<i>XYZ</i></tt>以默认方式扫描附带的元素。</span> <span>以这种方式，具体的访问者可以控制关于附加处理的遍历组件元素的顺序;</span> <span>例如，在覆盖方法的开始时始终调用<tt>super.visit<i>XYZ</i></tt>将产生预序遍历等。如果组件元素应以其他顺序<tt>遍历</tt> ，而不是调用<tt>super.visit<i>XYZ</i></tt> ，则覆盖访问方法应该调用<code>scan</code>中的元素期望的顺序。</span> </p>
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<p> <span>本课程中的方法可能会因其总体合同而被覆盖。</span> <span>需要注意的是注释方法，具体子类与<a href="../../../../java/lang/Override.html" title="java.lang中的注释"><code>@Override</code></a>将有助于确定那些打算重写的方法。</span> </p>
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<p> <span><b>警告：</b> <code>ElementVisitor</code>实现的ElementVisitor接口可能会在将来添加到其中的方法，以适应未来版本的Java编程语言中添加的新的，当前未知的语言结构。</span> <span>因此，名字以<code>"visit"</code>开头的<code>"visit"</code>可能会在将来添加到这个类中;</span> <span>为了避免不兼容，扩展此类的类不应声明任何以<code>"visit"</code>实例方法。</span> </p>
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<p> <span>当添加这种新的访问方法时，此类中的默认实现将是调用<a href="../../../../javax/lang/model/util/AbstractElementVisitor6.html#visitUnknown-javax.lang.model.element.Element-P-"><code>visitUnknown</code></a>方法。</span> <span>还将引入新的元素扫描器访问者类来对应于新的语言级别;</span> <span>该访问者对于访问方法将具有不同的默认行为。</span> <span>当新访客被介绍时，全部或部分访问者可能会被弃用。</span> </p>
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</div>
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<dl>
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<dt>
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<span class="simpleTagLabel">从以下版本开始：</span>
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</dt>
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<dd>
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1.8
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</dd>
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<dt>
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<span class="seeLabel">另请参见：</span>
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</dt>
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<dd>
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<span><a href="../../../../javax/lang/model/util/ElementScanner6.html" title="javax.lang.model.util中的类"><code>ElementScanner6</code></a> ， <a href="../../../../javax/lang/model/util/ElementScanner7.html" title="javax.lang.model.util中的类"><code>ElementScanner7</code></a></span>
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</dd>
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</dl> </li>
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</ul>
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</div>
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<div class="summary">
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<li class="blockList">
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<!-- =========== FIELD SUMMARY =========== -->
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<ul class="blockList">
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<li class="blockList"><a name="field.summary">
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<!-- --> </a> <h3>Field Summary</h3>
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<ul class="blockList">
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<li class="blockList"><a name="fields.inherited.from.class.javax.lang.model.util.ElementScanner6">
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<!-- --> </a> <h3>Fields inherited from class javax.lang.model.util.<a href="../../../../javax/lang/model/util/ElementScanner6.html" title="class in javax.lang.model.util">ElementScanner6</a></h3> <code><a href="../../../../javax/lang/model/util/ElementScanner6.html#DEFAULT_VALUE">DEFAULT_VALUE</a></code></li>
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</ul> </li>
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</ul>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<ul class="blockList">
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<li class="blockList"><a name="constructor.summary">
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<!-- --> </a> <h3>构造方法摘要</h3>
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<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Constructor Summary table, listing constructors, and an explanation">
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<caption>
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<span>构造方法</span>
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<span class="tabEnd"> </span>
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</caption>
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<tbody>
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<tr>
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<th class="colFirst" scope="col">Modifier</th>
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<th class="colLast" scope="col">Constructor and Description</th>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>protected </code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/lang/model/util/ElementScanner8.html#ElementScanner8--">ElementScanner8</a></span>()</code>
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<div class="block">
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<span>具体子类的构造方法</span>
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<span>使用<code>null</code>作为默认值。</span>
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</div> </td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>protected </code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/lang/model/util/ElementScanner8.html#ElementScanner8-R-">ElementScanner8</a></span>(<a href="../../../../javax/lang/model/util/ElementScanner8.html" title="type parameter in ElementScanner8">R</a> defaultValue)</code>
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<div class="block">
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<span>具体子类的构造方法</span>
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<span>使用参数作为默认值。</span>
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</div> </td>
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</tr>
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</tbody>
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</table> </li>
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</ul>
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<!-- ========== METHOD SUMMARY =========== -->
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<li class="blockList"><a name="method.summary">
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<!-- --> </a> <h3>方法摘要</h3>
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<li class="blockList"><a name="methods.inherited.from.class.javax.lang.model.util.ElementScanner7">
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<!-- --> </a> <h3>Methods inherited from class javax.lang.model.util.<a href="../../../../javax/lang/model/util/ElementScanner7.html" title="class in javax.lang.model.util">ElementScanner7</a></h3> <code><a href="../../../../javax/lang/model/util/ElementScanner7.html#visitVariable-javax.lang.model.element.VariableElement-P-">visitVariable</a></code></li>
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</ul>
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<li class="blockList"><a name="methods.inherited.from.class.javax.lang.model.util.ElementScanner6">
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<!-- --> </a> <h3>Methods inherited from class javax.lang.model.util.<a href="../../../../javax/lang/model/util/ElementScanner6.html" title="class in javax.lang.model.util">ElementScanner6</a></h3> <code><a href="../../../../javax/lang/model/util/ElementScanner6.html#scan-javax.lang.model.element.Element-">scan</a>, <a href="../../../../javax/lang/model/util/ElementScanner6.html#scan-javax.lang.model.element.Element-P-">scan</a>, <a href="../../../../javax/lang/model/util/ElementScanner6.html#scan-java.lang.Iterable-P-">scan</a>, <a href="../../../../javax/lang/model/util/ElementScanner6.html#visitExecutable-javax.lang.model.element.ExecutableElement-P-">visitExecutable</a>, <a href="../../../../javax/lang/model/util/ElementScanner6.html#visitPackage-javax.lang.model.element.PackageElement-P-">visitPackage</a>, <a href="../../../../javax/lang/model/util/ElementScanner6.html#visitType-javax.lang.model.element.TypeElement-P-">visitType</a>, <a href="../../../../javax/lang/model/util/ElementScanner6.html#visitTypeParameter-javax.lang.model.element.TypeParameterElement-P-">visitTypeParameter</a></code></li>
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</ul>
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<ul class="blockList">
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<li class="blockList"><a name="methods.inherited.from.class.javax.lang.model.util.AbstractElementVisitor6">
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<!-- --> </a> <h3>Methods inherited from class javax.lang.model.util.<a href="../../../../javax/lang/model/util/AbstractElementVisitor6.html" title="class in javax.lang.model.util">AbstractElementVisitor6</a></h3> <code><a href="../../../../javax/lang/model/util/AbstractElementVisitor6.html#visit-javax.lang.model.element.Element-">visit</a>, <a href="../../../../javax/lang/model/util/AbstractElementVisitor6.html#visit-javax.lang.model.element.Element-P-">visit</a>, <a href="../../../../javax/lang/model/util/AbstractElementVisitor6.html#visitUnknown-javax.lang.model.element.Element-P-">visitUnknown</a></code></li>
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</ul>
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<ul class="blockList">
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<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
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<!-- --> </a> <h3>Methods inherited from class java.lang.<a href="../../../../java/lang/Object.html" title="class in java.lang">Object</a></h3> <code><a href="../../../../java/lang/Object.html#clone--">clone</a>, <a href="../../../../java/lang/Object.html#equals-java.lang.Object-">equals</a>, <a href="../../../../java/lang/Object.html#finalize--">finalize</a>, <a href="../../../../java/lang/Object.html#getClass--">getClass</a>, <a href="../../../../java/lang/Object.html#hashCode--">hashCode</a>, <a href="../../../../java/lang/Object.html#notify--">notify</a>, <a href="../../../../java/lang/Object.html#notifyAll--">notifyAll</a>, <a href="../../../../java/lang/Object.html#toString--">toString</a>, <a href="../../../../java/lang/Object.html#wait--">wait</a>, <a href="../../../../java/lang/Object.html#wait-long-">wait</a>, <a href="../../../../java/lang/Object.html#wait-long-int-">wait</a></code></li>
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</ul> </li>
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</ul> </li>
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</ul>
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</div>
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<div class="details">
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<ul class="blockList">
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<li class="blockList">
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<ul class="blockList">
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<li class="blockList"><a name="constructor.detail">
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<!-- --> </a> <h3>构造方法详细信息</h3> <a name="ElementScanner8--">
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<!-- --> </a>
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<ul class="blockList">
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<li class="blockList"> <h4>ElementScanner8</h4> <pre>protected ElementScanner8()</pre>
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<div class="block">
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<span>具体子类的构造方法</span>
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<span>使用<code>null</code>作为默认值。</span>
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</div> </li>
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</ul> <a name="ElementScanner8-java.lang.Object-">
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<!-- --> </a><a name="ElementScanner8-R-">
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<!-- --> </a>
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<ul class="blockListLast">
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<li class="blockList"> <h4>ElementScanner8</h4> <pre>protected ElementScanner8(<a href="../../../../javax/lang/model/util/ElementScanner8.html" title="type parameter in ElementScanner8">R</a> defaultValue)</pre>
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<div class="block">
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<span>具体子类的构造方法</span>
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<span>使用参数作为默认值。</span>
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>defaultValue</code> - 默认值
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</dd>
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</dl> </li>
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</ul> </li>
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</ul> </li>
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</ul>
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</div>
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