Package org.apache.jasper.compiler

Class JspUtil

java.lang.Object

org.apache.jasper.compiler.JspUtil

public class JspUtil
extends Object

This class has all the utility method(s). Ideally should move all the bean containers here.

Author:

Mandar Raje., Rajiv Mordani., Danno Ferrin, Pierre Delisle, Shawn Bayern, Mark Roth

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	JspUtil.ValidAttribute

Field Summary

Fields

Modifier and Type	Field	Description
static final int	CHUNKSIZE

Constructor Summary

Constructors

Constructor	Description
JspUtil()

Method Summary

Modifier and Type	Method	Description
static boolean	booleanValue(String s)	Convert a String value to 'boolean'.
static void	checkAttributes(String typeOfTag, org.apache.jasper.compiler.Node n, JspUtil.ValidAttribute[] validAttributes, ErrorDispatcher err)	Checks if all mandatory attributes are present and if all attributes present have valid names.
static void	checkScope(String scope, org.apache.jasper.compiler.Node n, ErrorDispatcher err)	Checks to see if the given scope is valid.
static String	coerceToBoolean(String s, boolean isNamedAttribute)
static String	coerceToByte(String s, boolean isNamedAttribute)
static String	coerceToChar(String s, boolean isNamedAttribute)
static String	coerceToCharacter(String s, boolean isNamedAttribute)
static String	coerceToDouble(String s, boolean isNamedAttribute)
static String	coerceToFloat(String s, boolean isNamedAttribute)
static String	coerceToInt(String s, boolean isNamedAttribute)
static String	coerceToInteger(String s, boolean isNamedAttribute)
static String	coerceToLong(String s, boolean isNamedAttribute)
static String	coerceToPrimitiveBoolean(String s, boolean isNamedAttribute)
static String	coerceToPrimitiveByte(String s, boolean isNamedAttribute)
static String	coerceToPrimitiveDouble(String s, boolean isNamedAttribute)
static String	coerceToPrimitiveFloat(String s, boolean isNamedAttribute)
static String	coerceToPrimitiveLong(String s, boolean isNamedAttribute)
static String	coerceToPrimitiveShort(String s, boolean isNamedAttribute)
static String	coerceToShort(String s, boolean isNamedAttribute)
static String	getExprInXml(String expression)	Takes a potential expression and converts it into XML form.
static InputSource	getInputSource(String fname, Jar jar, JspCompilationContext ctxt)
static BufferedInputStream	getInputStream(String fname, Jar jar, JspCompilationContext ctxt)
static String	getTagHandlerClassName(String path, String packageName, String urn, ErrorDispatcher err)	Gets the fully-qualified class name of the tag handler corresponding to the given tag file path.
static String	interpreterCall(boolean isTagFile, String expression, Class<?> expectedType, String fnmapvar)	Produces a String representing a call to the EL interpreter.
static boolean	isJavaKeyword(String key)	Test whether the argument is a Java keyword.
static final String	makeJavaIdentifier(String identifier)	Converts the given identifier to a legal Java identifier
static final String	makeJavaIdentifierForAttribute(String identifier)	Converts the given identifier to a legal Java identifier to be used for JSP Tag file attribute names.
static final String	makeJavaPackage(String path)	Converts the given path to a Java package or fully-qualified class name
static final String	mangleChar(char ch)	Mangle the specified character to create a legal Java class name.
static Class<?>	toClass(String type, ClassLoader loader)	Returns the Class object associated with the class or interface with the given string name.
static String	toJavaSourceType(String type)	Class.getName() return arrays in the form "[[[<et>", where et, the element type can be one of ZBCDFIJS or L<classname>;.
static String	toJavaSourceTypeFromTld(String type)	Handles taking input from TLDs 'java.lang.Object' -> 'java.lang.Object.class' 'int' -> 'int.class' 'void' -> 'Void.TYPE' 'int[]' -> 'int[].class'

Methods inherited from class java.lang.Object

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

Field Details

CHUNKSIZE

public static final int CHUNKSIZE

See Also:

• Constant Field Values

Constructor Details

JspUtil

public JspUtil()

Method Details

getExprInXml

public static String getExprInXml(String expression)

Takes a potential expression and converts it into XML form.

Parameters:

expression - The expression to convert

Returns:

XML view

checkScope

public static void checkScope(String scope,
 org.apache.jasper.compiler.Node n,
 ErrorDispatcher err)
                       throws JasperException

Checks to see if the given scope is valid.

Parameters:

scope - The scope to be checked

n - The Node containing the 'scope' attribute whose value is to be checked

err - error dispatcher

Throws:

JasperException - if scope is not null and different from "page", "request", "session", and "application"

checkAttributes

public static void checkAttributes(String typeOfTag,
 org.apache.jasper.compiler.Node n,
 JspUtil.ValidAttribute[] validAttributes,
 ErrorDispatcher err)
                            throws JasperException

Checks if all mandatory attributes are present and if all attributes present have valid names. Checks attributes specified as XML-style attributes as well as attributes specified using the jsp:attribute standard action.

Parameters:

typeOfTag - The tag type

n - The corresponding node

validAttributes - The array with the valid attributes

err - Dispatcher for errors

Throws:

JasperException - An error occurred

booleanValue

public static boolean booleanValue(String s)

Convert a String value to 'boolean'. Besides the standard conversions done by Boolean.parseBoolean(s), the value "yes" (ignore case) is also converted to 'true'. If 's' is null, then 'false' is returned.

Parameters:

s - the string to be converted

Returns:

the boolean value associated with the string s

toClass

public static Class<?> toClass(String type,
 ClassLoader loader)
                        throws ClassNotFoundException

Returns the Class object associated with the class or interface with the given string name.

The Class object is determined by passing the given string name to the Class.forName() method, unless the given string name represents a primitive type, in which case it is converted to a Class object by appending ".class" to it (e.g., "int.class").

Parameters:

type - The class name, array or primitive type

loader - The class loader

Returns:

the loaded class

Throws:

ClassNotFoundException - Loading class failed

interpreterCall

public static String interpreterCall(boolean isTagFile,
 String expression,
 Class<?> expectedType,
 String fnmapvar)

Produces a String representing a call to the EL interpreter.

Parameters:

isTagFile - true if the file is a tag file rather than a JSP

expression - a String containing zero or more "${}" expressions

expectedType - the expected type of the interpreted result

fnmapvar - Variable pointing to a function map.

Returns:

a String representing a call to the EL interpreter.

coerceToPrimitiveBoolean

public static String coerceToPrimitiveBoolean(String s,
 boolean isNamedAttribute)

coerceToBoolean

public static String coerceToBoolean(String s,
 boolean isNamedAttribute)

coerceToPrimitiveByte

public static String coerceToPrimitiveByte(String s,
 boolean isNamedAttribute)

coerceToByte

public static String coerceToByte(String s,
 boolean isNamedAttribute)

coerceToChar

public static String coerceToChar(String s,
 boolean isNamedAttribute)

coerceToCharacter

public static String coerceToCharacter(String s,
 boolean isNamedAttribute)

coerceToPrimitiveDouble

public static String coerceToPrimitiveDouble(String s,
 boolean isNamedAttribute)

coerceToDouble

public static String coerceToDouble(String s,
 boolean isNamedAttribute)

coerceToPrimitiveFloat

public static String coerceToPrimitiveFloat(String s,
 boolean isNamedAttribute)

coerceToFloat

public static String coerceToFloat(String s,
 boolean isNamedAttribute)

coerceToInt

public static String coerceToInt(String s,
 boolean isNamedAttribute)

coerceToInteger

public static String coerceToInteger(String s,
 boolean isNamedAttribute)

coerceToPrimitiveShort

public static String coerceToPrimitiveShort(String s,
 boolean isNamedAttribute)

coerceToShort

public static String coerceToShort(String s,
 boolean isNamedAttribute)

coerceToPrimitiveLong

public static String coerceToPrimitiveLong(String s,
 boolean isNamedAttribute)

coerceToLong

public static String coerceToLong(String s,
 boolean isNamedAttribute)

getInputStream

public static BufferedInputStream getInputStream(String fname,
 Jar jar,
 JspCompilationContext ctxt)
                                          throws IOException

Throws:

IOException

getInputSource

public static InputSource getInputSource(String fname,
 Jar jar,
 JspCompilationContext ctxt)
                                  throws IOException

Throws:

IOException

getTagHandlerClassName

public static String getTagHandlerClassName(String path,
 String packageName,
 String urn,
 ErrorDispatcher err)
                                     throws JasperException

Gets the fully-qualified class name of the tag handler corresponding to the given tag file path.

Parameters:

path - Tag file path

packageName - The package name

urn - The tag identifier

err - Error dispatcher

Returns:

Fully-qualified class name of the tag handler corresponding to the given tag file path

Throws:

JasperException - Failed to generate a class name for the tag

makeJavaPackage

public static final String makeJavaPackage(String path)

Converts the given path to a Java package or fully-qualified class name

Parameters:

path - Path to convert

Returns:

Java package corresponding to the given path

makeJavaIdentifier

public static final String makeJavaIdentifier(String identifier)

Converts the given identifier to a legal Java identifier

Parameters:

identifier - Identifier to convert

Returns:

Legal Java identifier corresponding to the given identifier

makeJavaIdentifierForAttribute

public static final String makeJavaIdentifierForAttribute(String identifier)

Converts the given identifier to a legal Java identifier to be used for JSP Tag file attribute names.

Parameters:

identifier - Identifier to convert

Returns:

Legal Java identifier corresponding to the given identifier

mangleChar

public static final String mangleChar(char ch)

Mangle the specified character to create a legal Java class name.

Parameters:

ch - The character

Returns:

the replacement character as a string

isJavaKeyword

public static boolean isJavaKeyword(String key)

Test whether the argument is a Java keyword.

Parameters:

key - The name

Returns:

true if the name is a java identifier

toJavaSourceTypeFromTld

public static String toJavaSourceTypeFromTld(String type)

Handles taking input from TLDs 'java.lang.Object' -> 'java.lang.Object.class' 'int' -> 'int.class' 'void' -> 'Void.TYPE' 'int[]' -> 'int[].class'

Parameters:

type - The type from the TLD

Returns:

the Java type

toJavaSourceType

public static String toJavaSourceType(String type)

Class.getName() return arrays in the form "[[[<et>", where et, the element type can be one of ZBCDFIJS or L<classname>;. It is converted into forms that can be understood by javac.

Parameters:

type - the type to convert

Returns:

the equivalent type in Java sources