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## org.apache.xpath.functions
Class FunctionDef1Arg

    java.lang.Object
      |
      +--org.apache.xpath.Expression
            |
            +--org.apache.xpath.functions.Function
                  |
                  +--org.apache.xpath.functions.FunctionOneArg
                        |
                        +--org.apache.xpath.functions.FunctionDef1Arg

Direct Known Subclasses:
  FuncDoclocation, FuncGenerateId, FuncLocalPart, FuncNamespace, FuncNormalizeSpace, FuncNumber, FuncQname, FuncString, FuncStringLength

public class FunctionDef1Arg
extends FunctionOneArg

**For advanced use only** Base class for functions that accept one argument that can be defaulted if not specified.

See Also:
  Serialized Form

Constructor Summary
`FunctionDef1Arg()`

Method Summary
`boolean` | `Arg0IsNodesetExpr()` Tell if the expression is a nodeset expression.
`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.

Methods inherited from class org.apache.xpath.functions.FunctionOneArg
`callArgVisitors, deepEquals, fixupVariables, getArg0, getExpression, setArg, setExpression`

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, isStableNumber, num, warn, xstr`

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

Constructor Detail

### FunctionDef1Arg

    public FunctionDef1Arg()

Method Detail

### Arg0IsNodesetExpr

    public boolean Arg0IsNodesetExpr()

  Tell if the expression is a nodeset expression.
  Returns:
    true if the expression can be represented as a nodeset.

### checkNumberArgs

    public void checkNumberArgs(int argNum)
                         throws WrongNumberArgsException

  Check that the number of arguments passed to this function is correct.
  Parameters:
    `argNum` - The number of arguments that is being passed to the function.
  Throws:
    WrongNumberArgsException - if the number of arguments is not 0 or 1.
  Overrides:
    checkNumberArgs in class FunctionOneArg

### canTraverseOutsideSubtree

    public boolean canTraverseOutsideSubtree()

  Tell if this expression or it's subexpressions can traverse outside the current subtree.
  Returns:
    true if traversal outside the context node's subtree can occur.
  Overrides:
    canTraverseOutsideSubtree in class FunctionOneArg

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Copyright © 2002 Apache XML Project. All Rights Reserved.