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* <td valign="top" align="center" bgcolor="#ffffff">AT_BEGIN, NESTED
* </td> * <td valign="top" align="center" bgcolor="#ffffff">
* </td> * <td valign="top" align="center" bgcolor="#ffffff">
* </td> * <td valign="top" align="center" bgcolor="#ffffff">AT_BEGIN, AT_END
* </td> * <td valign="top" align="center" bgcolor="#ffffff">
* </td> * </tr> * <tr> * <td valign="top" bgcolor="#c0c0c0">IterationTag
* </b> * <td valign="top" align="center" bgcolor="#ffffff">AT_BEGIN, NESTED
* </td> * <td valign="top" align="center" bgcolor="#ffffff">
* </td> * <td valign="top" align="center" bgcolor="#ffffff">AT_BEGIN, NESTED
* </td> * <td valign="top" align="center" bgcolor="#ffffff">AT_BEGIN, AT_END
* </td> * <td valign="top" align="center" bgcolor="#ffffff">
* </td> * </tr> * <tr> * <td valign="top" bgcolor="#c0c0c0">BodyTag
* </b> * <td valign="top" align="center" bgcolor="#ffffff">AT_BEGIN, NESTED1
* </td> * <td valign="top" align="center" bgcolor="#ffffff">AT_BEGIN, NESTED1
* </td> * <td valign="top" align="center" bgcolor="#ffffff">AT_BEGIN, NESTED
* </td> * <td valign="top" align="center" bgcolor="#ffffff">AT_BEGIN, AT_END
* </td> * <td valign="top" align="center" bgcolor="#ffffff">
* </td> * </tr> * <tr> * <td valign="top" bgcolor="#c0c0c0">SimpleTag
* </b> * <td valign="top" align="center" bgcolor="#ffffff">
* </td> * <td valign="top" align="center" bgcolor="#ffffff">
* </td> * <td valign="top" align="center" bgcolor="#ffffff">
* </td> * <td valign="top" align="center" bgcolor="#ffffff">
* </td> * <td valign="top" align="center" bgcolor="#ffffff">AT_BEGIN, AT_END
* </td> * </tr> * </tbody> * </table> * <sup>1 Called after doStartTag() if * <code>EVAL_BODY_INCLUDE is returned, or after * <code>doInitBody() otherwise. * </blockquote> * * <p>Variable Information in the TLD * <p> * Scripting variable information can also be encoded directly for most cases * into the Tag Library Descriptor using the <variable> subelement of the * <tag> element. See the JSP specification. */ public class VariableInfo { /** * Scope information that scripting variable is visible only within the * start/end tags. */ public static final int NESTED = 0; /** * Scope information that scripting variable is visible after start tag. */ public static final int AT_BEGIN = 1; /** * Scope information that scripting variable is visible after end tag. */ public static final int AT_END = 2; /** * Constructor * These objects can be created (at translation time) by the TagExtraInfo * instances. * * @param varName The name of the scripting variable * @param className The type of this variable * @param declare If true, it is a new variable (in some languages this will * require a declaration) * @param scope Indication on the lexical scope of the variable */ public VariableInfo(String varName, String className, boolean declare, int scope) { this.varName = varName; this.className = className; this.declare = declare; this.scope = scope; } // Accessor methods /** * Returns the name of the scripting variable. * * @return the name of the scripting variable */ public String getVarName() { return varName; } /** * Returns the type of this variable. * * @return the type of this variable */ public String getClassName() { return className; } /** * Returns whether this is a new variable. * If so, in some languages this will require a declaration. * * @return whether this is a new variable. */ public boolean getDeclare() { return declare; } /** * Returns the lexical scope of the variable. * * @return the lexical scope of the variable, either AT_BEGIN, AT_END, * or NESTED. * @see #AT_BEGIN * @see #AT_END * @see #NESTED */ public int getScope() { return scope; } // == private data private String varName; private String className; private boolean declare; private int scope; }

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat VariableInfo.java source code file:

Tomcat example source code file (VariableInfo.java)

This example Tomcat source code file (VariableInfo.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

at_begin, at_begin, at_end, at_end, nested, string, string, variableinfo, variableinfo

The Tomcat VariableInfo.java source code

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

 
package javax.servlet.jsp.tagext;

/**
 * Information on the scripting variables that are created/modified by
 * a tag (at run-time). This information is provided by TagExtraInfo
 * classes and it is used by the translation phase of JSP.
 *
 * <p>
 * Scripting variables generated by a custom action have an associated 
 * scope of either AT_BEGIN, NESTED, or AT_END.
 *
 * <p>
 * The class name (VariableInfo.getClassName) in the returned objects
 * is used to determine the types of the scripting variables.
 * Note that because scripting variables are assigned their values
 * from scoped attributes which cannot be of primitive types,
 * "boxed" types such as <code>java.lang.Integer must 
 * be used instead of primitives.
 *
 * <p>
 * The class name may be a Fully Qualified Class Name, or a short
 * class name.
 *
 * <p>
 * If a Fully Qualified Class Name is provided, it should refer to a
 * class that should be in the CLASSPATH for the Web Application (see
 * Servlet 2.4 specification - essentially it is WEB-INF/lib and
 * WEB-INF/classes). Failure to be so will lead to a translation-time
 * error.
 *
 * <p>
 * If a short class name is given in the VariableInfo objects, then
 * the class name must be that of a public class in the context of the
 * import directives of the page where the custom action appears. 
 * The class must also be in the CLASSPATH for the Web Application 
 * (see Servlet 2.4 specification - essentially it is WEB-INF/lib and
 * WEB-INF/classes). Failure to be so will lead to a translation-time
 * error.
 *
 * <p>Usage Comments
 * <p>
 * Frequently a fully qualified class name will refer to a class that
 * is known to the tag library and thus, delivered in the same JAR
 * file as the tag handlers. In most other remaining cases it will
 * refer to a class that is in the platform on which the JSP processor
 * is built (like J2EE). Using fully qualified class names in this
 * manner makes the usage relatively resistant to configuration
 * errors.
 *
 * <p>
 * A short name is usually generated by the tag library based on some
 * attributes passed through from the custom action user (the author),
 * and it is thus less robust: for instance a missing import directive
 * in the referring JSP page will lead to an invalid short name class
 * and a translation error.
 *
 * <p>Synchronization Protocol
 *
 * <p>
 * The result of the invocation on getVariableInfo is an array of
 * VariableInfo objects.  Each such object describes a scripting
 * variable by providing its name, its type, whether the variable is
 * new or not, and what its scope is.  Scope is best described through
 * a picture:
 *
 * <p>
 * <IMG src="doc-files/VariableInfo-1.gif"
 *      alt="NESTED, AT_BEGIN and AT_END Variable Scopes"/>
 *
 *<p>
 * The JSP 2.0 specification defines the interpretation of 3 values:
 * 
 * <ul>
 * <li> NESTED, if the scripting variable is available between
 * the start tag and the end tag of the action that defines it.
 * <li>
 * AT_BEGIN, if the scripting variable is available from the start tag
 * of the action that defines it until the end of the scope.
 * <li> AT_END, if the scripting variable is available after the end tag
 * of the action that defines it until the end of the scope.
 * </ul>
 *
 * The scope value for a variable implies what methods may affect its
 * value and thus where synchronization is needed as illustrated by
 * the table below.  <b>Note: the synchronization of the variable(s)
 * will occur <em>after the respective method has been called.
 *
 * <blockquote>
 * <table cellpadding="2" cellspacing="2" border="0" width="55%"
 *        bgcolor="#999999" summary="Variable Synchronization Points">
 * <tbody>
 *   <tr align="center">
 *     <td valign="top" colspan="6" bgcolor="#999999">Variable Synchronization
 *     Points</b>
* </td> * </tr> * <tr> * <th valign="top" bgcolor="#c0c0c0">  * <th valign="top" bgcolor="#c0c0c0" align="center">doStartTag() * <th valign="top" bgcolor="#c0c0c0" align="center">doInitBody() * <th valign="top" bgcolor="#c0c0c0" align="center">doAfterBody() * <th valign="top" bgcolor="#c0c0c0" align="center">doEndTag() * <th valign="top" bgcolor="#c0c0c0" align="center">doTag() * </tr> * <tr> * <td valign="top" bgcolor="#c0c0c0">Tag
* </b>
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