Class Generator.GenerateVisitor

java.lang.Object

org.apache.jasper.compiler.Node.Visitor

org.apache.jasper.compiler.Generator.GenerateVisitor

Enclosing class:

Generator

class Generator.GenerateVisitor
extends Node.Visitor

A visitor that generates codes for the elements in the page.

Field Summary

Fields

Modifier and Type	Field	Description
private int	arrayCount
private static final String	DOUBLE_QUOTE
private Generator.FragmentHelperClass	fragmentHelperClass
private HashMap<String, HashMap<String, Generator.TagHandlerInfo>>	handlerInfos
private boolean	isFragment
private boolean	isSimpleTagHandler
private boolean	isSimpleTagParent
private boolean	isTagFile
private int	methodNesting
private ArrayList<Generator.GenBuffer>	methodsBuffered
private ServletWriter	out
private String	parent
private String	pushBodyCountVar
private String	simpleTagHandlerVar
private static final String	SINGLE_QUOTE
private HashMap<String,Integer>	tagVarNumbers
private HashMap<String,String>	textMap

Constructor Summary

Constructors

Constructor	Description
GenerateVisitor(boolean isTagFile, ServletWriter out, ArrayList<Generator.GenBuffer> methodsBuffered, Generator.FragmentHelperClass fragmentHelperClass)	Constructor.

Method Summary

Modifier and Type	Method	Description
private String	attributeValue(Node.JspAttribute attr, boolean encode, Class expectedType)	Returns an attribute value, optionally URL encoded.
private String	convertString(Class<?> c, String s, String attrName, Class<?> propEditorClass, boolean isNamedAttribute)
private String	createTagVarName(String fullName, String prefix, String shortName)
private void	declareScriptingVars(Node.CustomTag n, int scope)
private String	evaluateAttribute(Generator.TagHandlerInfo handlerInfo, Node.JspAttribute attr, Node.CustomTag n, String tagHandlerVar)
private Node.JspBody	findJspBody(Node parent)	Finds the invalid input: '<'jsp:body> subelement of the given parent node.
private String	generateAliasMap(Node.CustomTag n, String tagHandlerVar)	Generate code to create a map for the alias variables
private void	generateCustomDoTag(Node.CustomTag n, Generator.TagHandlerInfo handlerInfo, String tagHandlerVar)
private void	generateCustomEnd(Node.CustomTag n, String tagHandlerVar, String tagEvalVar, String tagPushBodyCountVar)
private void	generateCustomStart(Node.CustomTag n, Generator.TagHandlerInfo handlerInfo, String tagHandlerVar, String tagEvalVar, String tagPushBodyCountVar)
private void	generateJspFragment(Node n, String tagHandlerVar)	Generates anonymous JspFragment inner class which is passed as an argument to SimpleTag.setJspBody().
String	generateNamedAttributeJspFragment(Node.NamedAttribute n, String tagHandlerVar)	Similar to generateNamedAttributeValue, but create a JspFragment instead.
String	generateNamedAttributeValue(Node.NamedAttribute n)	Generate the code required to obtain the runtime value of the given named attribute.
private void	generateSetters(Node.CustomTag n, String tagHandlerVar, Generator.TagHandlerInfo handlerInfo, boolean simpleTag)
private void	generateTagPlugin(Node.CustomTag n)
private String	getScopeConstant(String scope)
private Generator.TagHandlerInfo	getTagHandlerInfo(Node.CustomTag n)
private String	makeAttr(String attr, String value)
private void	prepareParams(Node parent)	Scans through all child nodes of the given parent for subelements.
private void	printParams(Node n, String pageParam, boolean literal)	Prints the attribute value specified in the param action, in the form of name=value string.
private void	restoreScriptingVars(Node.CustomTag n, int scope)
private void	saveScriptingVars(Node.CustomTag n, int scope)
private void	syncScriptingVars(Node.CustomTag n, int scope)
void	visit(Node.AttributeGenerator n)
void	visit(Node.CustomTag n)
void	visit(Node.DoBodyAction n)
void	visit(Node.ELExpression n)
void	visit(Node.Expression n)
void	visit(Node.ForwardAction n)
void	visit(Node.GetProperty n)
void	visit(Node.IncludeAction n)
void	visit(Node.InvokeAction n)
void	visit(Node.JspBody n)
void	visit(Node.JspElement n)
void	visit(Node.NamedAttribute n)
void	visit(Node.PlugIn n)
void	visit(Node.Scriptlet n)
void	visit(Node.SetProperty n)
void	visit(Node.TemplateText n)
void	visit(Node.UninterpretedTag n)
void	visit(Node.UseBean n)

Methods inherited from class Node.Visitor

doVisit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visitBody

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

handlerInfos

private HashMap<String, HashMap<String, Generator.TagHandlerInfo>> handlerInfos

tagVarNumbers

private HashMap<String,Integer> tagVarNumbers

parent

private String parent

isSimpleTagParent

private boolean isSimpleTagParent

pushBodyCountVar

private String pushBodyCountVar

simpleTagHandlerVar

private String simpleTagHandlerVar

isSimpleTagHandler

private boolean isSimpleTagHandler

isFragment

private boolean isFragment

isTagFile

private boolean isTagFile

out

private ServletWriter out

methodsBuffered

private ArrayList<Generator.GenBuffer> methodsBuffered

fragmentHelperClass

private Generator.FragmentHelperClass fragmentHelperClass

methodNesting

private int methodNesting

arrayCount

private int arrayCount

textMap

private HashMap<String,String> textMap

SINGLE_QUOTE

private static final String SINGLE_QUOTE

See Also:

• Constant Field Values

DOUBLE_QUOTE

private static final String DOUBLE_QUOTE

See Also:

• Constant Field Values

Constructor Details

GenerateVisitor

public GenerateVisitor(boolean isTagFile,
 ServletWriter out,
 ArrayList<Generator.GenBuffer> methodsBuffered,
 Generator.FragmentHelperClass fragmentHelperClass)

Constructor.

Method Details

attributeValue

private String attributeValue(Node.JspAttribute attr,
 boolean encode,
 Class expectedType)

Returns an attribute value, optionally URL encoded. If the value is a runtime expression, the result is the expression itself, as a string. If the result is an EL expression, we insert a call to the interpreter. If the result is a Named Attribute we insert the generated variable name. Otherwise the result is a string literal, quoted and escaped.

Parameters:

attr - An JspAttribute object

encode - true if to be URL encoded

expectedType - the expected type for an EL evaluation (ignored for attributes that aren't EL expressions)

printParams

private void printParams(Node n,
 String pageParam,
 boolean literal)
                  throws JasperException

Prints the attribute value specified in the param action, in the form of name=value string.

Parameters:

n - the parent node for the param action nodes.

Throws:

JasperException

visit

public void visit(Node.Expression n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.Scriptlet n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.ELExpression n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.IncludeAction n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

prepareParams

private void prepareParams(Node parent)
                    throws JasperException

Scans through all child nodes of the given parent for subelements. For each element, if its value is specified via a Named Attribute (invalid input: '<'jsp:attribute>), generate the code to evaluate those bodies first.

If parent is null, simply returns.

Throws:

JasperException

findJspBody

private Node.JspBody findJspBody(Node parent)
                          throws JasperException

Finds the invalid input: '<'jsp:body> subelement of the given parent node. If not found, null is returned.

Throws:

JasperException

visit

public void visit(Node.ForwardAction n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.GetProperty n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.SetProperty n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.UseBean n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

makeAttr

private String makeAttr(String attr,
 String value)

Returns:

a string for the form 'attr = "value"'

visit

public void visit(Node.PlugIn n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.NamedAttribute n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.CustomTag n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.UninterpretedTag n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.JspElement n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.TemplateText n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.JspBody n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.InvokeAction n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.DoBodyAction n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

visit

public void visit(Node.AttributeGenerator n)
           throws JasperException

Overrides:

visit in class Node.Visitor

Throws:

JasperException

getTagHandlerInfo

private Generator.TagHandlerInfo getTagHandlerInfo(Node.CustomTag n)
                                            throws JasperException

Throws:

JasperException

generateTagPlugin

private void generateTagPlugin(Node.CustomTag n)
                        throws JasperException

Throws:

JasperException

generateCustomStart

private void generateCustomStart(Node.CustomTag n,
 Generator.TagHandlerInfo handlerInfo,
 String tagHandlerVar,
 String tagEvalVar,
 String tagPushBodyCountVar)
                          throws JasperException

Throws:

JasperException

generateCustomEnd

private void generateCustomEnd(Node.CustomTag n,
 String tagHandlerVar,
 String tagEvalVar,
 String tagPushBodyCountVar)

generateCustomDoTag

private void generateCustomDoTag(Node.CustomTag n,
 Generator.TagHandlerInfo handlerInfo,
 String tagHandlerVar)
                          throws JasperException

Throws:

JasperException

declareScriptingVars

private void declareScriptingVars(Node.CustomTag n,
 int scope)

saveScriptingVars

private void saveScriptingVars(Node.CustomTag n,
 int scope)

restoreScriptingVars

private void restoreScriptingVars(Node.CustomTag n,
 int scope)

syncScriptingVars

private void syncScriptingVars(Node.CustomTag n,
 int scope)

createTagVarName

private String createTagVarName(String fullName,
 String prefix,
 String shortName)

evaluateAttribute

private String evaluateAttribute(Generator.TagHandlerInfo handlerInfo,
 Node.JspAttribute attr,
 Node.CustomTag n,
 String tagHandlerVar)
                          throws JasperException

Throws:

JasperException

generateAliasMap

private String generateAliasMap(Node.CustomTag n,
 String tagHandlerVar)
                         throws JasperException

Generate code to create a map for the alias variables

Returns:

the name of the map

Throws:

JasperException

generateSetters

private void generateSetters(Node.CustomTag n,
 String tagHandlerVar,
 Generator.TagHandlerInfo handlerInfo,
 boolean simpleTag)
                      throws JasperException

Throws:

JasperException

convertString

private String convertString(Class<?> c,
 String s,
 String attrName,
 Class<?> propEditorClass,
 boolean isNamedAttribute)
                      throws JasperException

Throws:

JasperException

getScopeConstant

private String getScopeConstant(String scope)

generateJspFragment

private void generateJspFragment(Node n,
 String tagHandlerVar)
                          throws JasperException

Generates anonymous JspFragment inner class which is passed as an argument to SimpleTag.setJspBody().

Throws:

JasperException

generateNamedAttributeValue

public String generateNamedAttributeValue(Node.NamedAttribute n)
                                   throws JasperException

Generate the code required to obtain the runtime value of the given named attribute.

Returns:

The name of the temporary variable the result is stored in.

Throws:

JasperException

generateNamedAttributeJspFragment

public String generateNamedAttributeJspFragment(Node.NamedAttribute n,
 String tagHandlerVar)
                                         throws JasperException

Similar to generateNamedAttributeValue, but create a JspFragment instead.

Parameters:

n - The parent node of the named attribute

tagHandlerVar - The variable the tag handler is stored in, so the fragment knows its parent tag.

Returns:

The name of the temporary variable the fragment is stored in.

Throws:

JasperException