Class 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
    • 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,
                                               javax.el.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 javax.el.ELException
        Throws:
        javax.el.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)
      • 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.
      • expandClassPath

        public static List<String> expandClassPath​(List<String> files)
        Given a list of jar files, their manifest attribute Class-path are scanned, and jars specified there are added to the list. This is carried out recursively. Note: This is needed to work around the JDK bug 6725230.