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## org.apache.xpath
Class Arg

    java.lang.Object
      |
      +--org.apache.xpath.Arg

public class Arg
extends java.lang.Object

**For internal use only** This class holds an instance of an argument on the stack. The value of the argument can be either an XObject or a String containing an expression.

Constructor Summary
`Arg()` Construct a dummy parameter argument, with no QName and no value (either expression string or value XObject).
`Arg(QName qname, java.lang.String expression, boolean isFromWithParam)` Construct a parameter argument that contains an expression.
`Arg(QName qname, XObject val)` Construct a parameter argument which has an XObject value.
`Arg(QName qname, XObject val, boolean isFromWithParam)` Construct a parameter argument.

Method Summary
`void` | `detach()` Have the object release it's resources.
`boolean` | `equals(java.lang.Object obj)` Equality function specialized for the variable name.
`java.lang.String` | `getExpression()` Get the value expression for this argument.
`QName` | `getQName()` Get the qualified name for this argument.
`XObject` | `getVal()` Get the value for this argument.
`boolean` | `isFromWithParam()` Tell if this variable is a parameter passed with a with-param or as a top-level parameter.
`boolean` | `isVisible()` Tell if this variable is currently visible.
`void` | `setExpression(java.lang.String expr)` Set the value expression for this argument.
`void` | `setIsVisible(boolean b)` Update visibility status of this variable.
`void` | `setQName(QName name)` Set the qualified name for this argument.
`void` | `setVal(XObject val)` Set the value of this argument.

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

Constructor Detail

### Arg

    public Arg()

  Construct a dummy parameter argument, with no QName and no value (either expression string or value XObject). isVisible defaults to true.

### Arg

    public Arg(QName qname,
               java.lang.String expression,
               boolean isFromWithParam)

  Construct a parameter argument that contains an expression.
  Parameters:
    `qname` - Name of the argument, expressed as a QName object.
    `expression` - String to be stored as this argument's value expression.
    `isFromWithParam` - True if this is a parameter variable.

### Arg

    public Arg(QName qname,
               XObject val)

  Construct a parameter argument which has an XObject value. isVisible defaults to true.
  Parameters:
    `qname` - Name of the argument, expressed as a QName object.
    `val` - Value of the argument, expressed as an XObject

### Arg

    public Arg(QName qname,
               XObject val,
               boolean isFromWithParam)

  Construct a parameter argument.
  Parameters:
    `qname` - Name of the argument, expressed as a QName object.
    `val` - Value of the argument, expressed as an XObject
    `isFromWithParam` - True if this is a parameter variable.

Method Detail

### getQName

    public final QName getQName()

  Get the qualified name for this argument.
  Returns:
    QName object containing the qualified name

### setQName

    public final void setQName(QName name)

  Set the qualified name for this argument.
  Parameters:
    `name` - QName object representing the new Qualified Name.

### getVal

    public final XObject getVal()

  Get the value for this argument.
  Returns:
    the argument's stored XObject value.
  See Also:
    `setVal(XObject)`

### setVal

    public final void setVal(XObject val)

  Set the value of this argument.
  Parameters:
    `val` - an XObject representing the arguments's value.
  See Also:
    `getVal()`

### detach

    public void detach()

  Have the object release it's resources. Call only when the variable or argument is going out of scope.

### getExpression

    public java.lang.String getExpression()

  Get the value expression for this argument.
  Returns:
    String containing the expression previously stored into this argument
  See Also:
    `setExpression(java.lang.String)`

### setExpression

    public void setExpression(java.lang.String expr)

  Set the value expression for this argument.
  Parameters:
    `expr` - String containing the expression to be stored as this argument's value.
  See Also:
    `getExpression()`

### isFromWithParam

    public boolean isFromWithParam()

  Tell if this variable is a parameter passed with a with-param or as a top-level parameter.

### isVisible

    public boolean isVisible()

  Tell if this variable is currently visible.

### setIsVisible

    public void setIsVisible(boolean b)

  Update visibility status of this variable.

### equals

    public boolean equals(java.lang.Object obj)

  Equality function specialized for the variable name. If the argument is not a qname, it will deligate to the super class.
  Parameters:
    `obj` - the reference object with which to compare.
  Returns:
    `true` if this object is the same as the obj argument; `false` otherwise.
  Overrides:
    equals in class java.lang.Object

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Copyright © 2002 Apache XML Project. All Rights Reserved.