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## 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, Kin-man Chung

Nested Class Summary
`static class` | `JspUtil.ValidAttribute`

Field Summary
`static int` | `CHUNKSIZE`

Constructor Summary
`JspUtil()`

Method Summary
`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 Object` | `coerce(Class targetType, String value)`
`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` | `coerceToEnum(String s, String enumClass, 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` | `escapeQueryString(String unescString)`
`static char[]` | `escapeQuotes(char[] chars)`
`static String` | `escapeXml(String s)` Escape the 5 entities defined by XML.
`static String` | `getCanonicalName(Class c)` Compute the canonical name from a Class instance.
`static String` | `getExpr(String expression, boolean isXml)`
`static String` | `getExprInXml(String expression)` Takes a potential expression and converts it into XML form
`static InputStream` | `getInputStream(String fname, JarFile jarFile, JspCompilationContext ctxt, ErrorDispatcher err)`
`static String` | `getTagHandlerClassName(String path, 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, String expectedDeferredType, String expectedReturnType, String[] expectedParamTypes)` Produces a String representing a call to the EL interpreter.
`static boolean` | `isExpression(String token, boolean isXml)` Checks if the token is a runtime expression.
`static boolean` | `isJavaKeyword(String key)` Test whether the argument is a Java keyword
`static String` | `makeJavaIdentifier(String identifier)` Converts the given identifier to a legal Java identifier
`static String` | `makeJavaPackage(String path)` Converts the given path to a Java package or fully-qualified class name
`static String` | `makeXmlJavaIdentifier(String name)` Converts the given Xml name to a legal Java identifier.
`static String` | `mangleChar(char ch)` Mangle the specified character to create a legal Java class name.
`static String` | `nextTemporaryVariableName()` Generates a new temporary variable name.
`static char[]` | `removeQuotes(char[] chars)`
`static String` | `replace(String name, char replace, String with)` Replaces any occurrences of the character `replace` with the string `with`.
`static void` | `resetTemporaryVariableName()` Resets the temporary variable 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 "[[[", where et, the element type can be one of ZBCDFIJS or L; It is converted into forms that can be understood by javac.
`static void` | `validateExpressions(org.apache.jasper.compiler.Mark where, String expressions, FunctionMapper functionMapper, ErrorDispatcher err)` Validates the syntax of all EL expressions within the given string.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### CHUNKSIZE

    public static final int CHUNKSIZE

See Also:
  Constant Field Values

Constructor Detail

### JspUtil

    public JspUtil()

Method Detail

### removeQuotes

    public static char[] removeQuotes(char[] chars)

### escapeQuotes

    public static char[] escapeQuotes(char[] chars)

### isExpression

    public static boolean isExpression(String token,
                                       boolean isXml)

  Checks if the token is a runtime expression. In standard JSP syntax, a runtime expression starts with '<%' and ends with '%>'. When the JSP document is in XML syntax, a runtime expression starts with '%=' and ends with '%'.

  Parameters:
    `token` - The token to be checked return whether the token is a runtime expression or not.

### getExpr

    public static String getExpr(String expression,
                                 boolean isXml)

  Returns:
    the "expression" part of a runtime expression, taking the delimiters out.

### getExprInXml

    public static String getExprInXml(String expression)

  Takes a potential expression and converts it into XML form

### 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.

  Throws:
    `JasperException`

### escapeQueryString

    public static String escapeQueryString(String unescString)

### escapeXml

    public static String escapeXml(String s)

  Escape the 5 entities defined by XML.

### replace

    public static String replace(String name,
                                 char replace,
                                 String with)

  Replaces any occurrences of the character `replace` with the string `with`.

### booleanValue

    public static boolean booleanValue(String s)

  Convert a String value to 'boolean'. Besides the standard conversions done by Boolean.valueOf(s).booleanValue(), 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").

  Throws:
    `ClassNotFoundException`

### interpreterCall

    public static String interpreterCall(boolean isTagFile,
                                         String expression,
                                         Class expectedType,
                                         String fnmapvar,
                                         String expectedDeferredType,
                                         String expectedReturnType,
                                         String[] expectedParamTypes)

  Produces a String representing a call to the EL interpreter.

  Parameters:
    `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.

### validateExpressions

    public static void validateExpressions(org.apache.jasper.compiler.Mark where,
                                           String expressions,
                                           FunctionMapper functionMapper,
                                           ErrorDispatcher err)
                                    throws JasperException

  Validates the syntax of all EL expressions within the given string.

  Parameters:
    `where` - the approximate location of the expressions in the JSP page
    `expressions` - a string containing an EL expressions
    `err` - an error dispatcher to use
  Throws:
    `JasperException`

### coerce

    public static Object coerce(Class targetType,
                                String value)
                         throws ELException

  Throws:
    `ELException`

### resetTemporaryVariableName

    public static void resetTemporaryVariableName()

  Resets the temporary variable name. (not thread-safe)

### nextTemporaryVariableName

    public static String nextTemporaryVariableName()

  Generates a new temporary variable name. (not thread-safe)

### 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)

### coerceToEnum

    public static String coerceToEnum(String s,
                                      String enumClass,
                                      boolean isNamedAttribute)

### getInputStream

    public static InputStream getInputStream(String fname,
                                             JarFile jarFile,
                                             JspCompilationContext ctxt,
                                             ErrorDispatcher err)
                                      throws JasperException,
                                             IOException

  Throws:
    `JasperException`
    `IOException`

### getTagHandlerClassName

    public static String getTagHandlerClassName(String path,
                                                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
    `err` - Error dispatcher
  Returns:
    Fully-qualified class name of the tag handler corresponding to the given tag file path
  Throws:
    `JasperException`

### 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

### mangleChar

    public static final String mangleChar(char ch)

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

### isJavaKeyword

    public static boolean isJavaKeyword(String key)

  Test whether the argument is a Java keyword

### makeXmlJavaIdentifier

    public static final String makeXmlJavaIdentifier(String name)

  Converts the given Xml name to a legal Java identifier. This is slightly more efficient than makeJavaIdentifier in that we only need to worry about '.', '-', and ':' in the string. We also assume that the resultant string is further concatenated with some prefix string so that we don't have to worry about it being a Java key word.

  Parameters:
    `name` - Identifier to convert
  Returns:
    Legal Java identifier corresponding to the given identifier

### toJavaSourceType

    public static String toJavaSourceType(String type)

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

### getCanonicalName

    public static String getCanonicalName(Class c)

  Compute the canonical name from a Class instance. Note that a simple replacment of '$' with '.' of a binary name would not work, as '$' is a legal Java Identifier character.

  Parameters:
    `c` - A instance of java.lang.Class
  Returns:
    The canonical name of c.

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