org.apache.xpath.functions
Class FunctionOneArg

java.lang.Object
  extended by org.apache.xpath.Expression
      extended by org.apache.xpath.functions.Function
          extended by org.apache.xpath.functions.FunctionOneArg
All Implemented Interfaces:
java.io.Serializable, javax.xml.transform.SourceLocator, ExpressionNode, ExpressionOwner, XPathVisitable
Direct Known Subclasses:
FuncBoolean, FuncCeiling, FuncCount, FuncExtElementAvailable, FuncExtFunctionAvailable, FuncFloor, FuncId, FuncLang, FuncNot, FuncRound, FuncSum, FuncSystemProperty, Function2Args, FunctionDef1Arg, FuncUnparsedEntityURI

public class FunctionOneArg
extends Function
implements ExpressionOwner

Base class for functions that accept one argument.

See Also:
Serialized Form

Field Summary
(package private)  Expression m_arg0
          The first argument passed to the function (at index 0).
(package private) static long serialVersionUID
           
 
Constructor Summary
FunctionOneArg()
           
 
Method Summary
 void callArgVisitors(XPathVisitor visitor)
          Call the visitors for the function arguments.
 boolean canTraverseOutsideSubtree()
          Tell if this expression or it's subexpressions can traverse outside the current subtree.
 void checkNumberArgs(int argNum)
          Check that the number of arguments passed to this function is correct.
 boolean deepEquals(Expression expr)
          Compare this object with another object and see if they are equal, include the sub heararchy.
 void fixupVariables(java.util.Vector vars, int globalsSize)
          This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time.
 Expression getArg0()
          Return the first argument passed to the function (at index 0).
 Expression getExpression()
          Get the raw Expression object that this class wraps.
protected  void reportWrongNumberArgs()
          Constructs and throws a WrongNumberArgException with the appropriate message for this function object.
 void setArg(Expression arg, int argNum)
          Set an argument expression for a function.
 void setExpression(Expression exp)
          Set the raw expression object for this object.
 
Methods inherited from class org.apache.xpath.functions.Function
callVisitors, execute, postCompileStep
 
Methods inherited from class org.apache.xpath.Expression
asIterator, asIteratorRaw, asNode, assertion, bool, error, execute, execute, execute, executeCharsToContentHandler, exprAddChild, exprGetChild, exprGetNumChildren, exprGetParent, exprSetParent, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isNodesetExpr, isSameClass, isStableNumber, num, warn, xstr
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

serialVersionUID

static final long serialVersionUID
See Also:
Constant Field Values

m_arg0

Expression m_arg0
The first argument passed to the function (at index 0).

Constructor Detail

FunctionOneArg

public FunctionOneArg()
Method Detail

getArg0

public Expression getArg0()
Return the first argument passed to the function (at index 0).

Returns:
An expression that represents the first argument passed to the function.

setArg

public void setArg(Expression arg,
                   int argNum)
            throws WrongNumberArgsException
Set an argument expression for a function. This method is called by the XPath compiler.

Overrides:
setArg in class Function
Parameters:
arg - non-null expression that represents the argument.
argNum - The argument number index.
Throws:
WrongNumberArgsException - If the argNum parameter is greater than 0.

checkNumberArgs

public void checkNumberArgs(int argNum)
                     throws WrongNumberArgsException
Check that the number of arguments passed to this function is correct.

Overrides:
checkNumberArgs in class Function
Parameters:
argNum - The number of arguments that is being passed to the function.
Throws:
WrongNumberArgsException

reportWrongNumberArgs

protected void reportWrongNumberArgs()
                              throws WrongNumberArgsException
Constructs and throws a WrongNumberArgException with the appropriate message for this function object.

Overrides:
reportWrongNumberArgs in class Function
Throws:
WrongNumberArgsException

canTraverseOutsideSubtree

public boolean canTraverseOutsideSubtree()
Tell if this expression or it's subexpressions can traverse outside the current subtree.

Overrides:
canTraverseOutsideSubtree in class Expression
Returns:
true if traversal outside the context node's subtree can occur.

fixupVariables

public void fixupVariables(java.util.Vector vars,
                           int globalsSize)
This function is used to fixup variables from QNames to stack frame indexes at stylesheet build time.

Specified by:
fixupVariables in class Expression
Parameters:
vars - List of QNames that correspond to variables. This list should be searched backwards for the first qualified name that corresponds to the variable reference qname. The position of the QName in the vector from the start of the vector will be its position in the stack frame (but variables above the globalsTop value will need to be offset to the current stack frame).

callArgVisitors

public void callArgVisitors(XPathVisitor visitor)
Description copied from class: Function
Call the visitors for the function arguments.

Overrides:
callArgVisitors in class Function
See Also:
XPathVisitable.callVisitors(ExpressionOwner, XPathVisitor)

getExpression

public Expression getExpression()
Description copied from interface: ExpressionOwner
Get the raw Expression object that this class wraps.

Specified by:
getExpression in interface ExpressionOwner
Returns:
the raw Expression object, which should not normally be null.
See Also:
ExpressionOwner.getExpression()

setExpression

public void setExpression(Expression exp)
Description copied from interface: ExpressionOwner
Set the raw expression object for this object.

Specified by:
setExpression in interface ExpressionOwner
Parameters:
exp - the raw Expression object, which should not normally be null.
See Also:
ExpressionOwner.setExpression(Expression)

deepEquals

public boolean deepEquals(Expression expr)
Description copied from class: Expression
Compare this object with another object and see if they are equal, include the sub heararchy.

Overrides:
deepEquals in class Function
Parameters:
expr - Another expression object.
Returns:
true if this objects class and the expr object's class are the same, and the data contained within both objects are considered equal.
See Also:
Expression.deepEquals(Expression)