Field Detail

• OR_PRECEDENCE

  protected static final int OR_PRECEDENCE

  or precedence

  See Also:

  Constant Field Values

• AND_PRECEDENCE

  protected static final int AND_PRECEDENCE

  and precedence

  See Also:

  Constant Field Values

• COMPARE_PRECEDENCE

  protected static final int COMPARE_PRECEDENCE

  compare precedence

  See Also:

  Constant Field Values

• RELATIONAL_EXPR_PRECEDENCE

  protected static final int RELATIONAL_EXPR_PRECEDENCE

  relational expression precedence

  See Also:

  Constant Field Values

• ADD_PRECEDENCE

  protected static final int ADD_PRECEDENCE

  add/subtract precedence

  See Also:

  Constant Field Values

• MULTIPLY_PRECEDENCE

  protected static final int MULTIPLY_PRECEDENCE

  multiply/divide/mod precedence

  See Also:

  Constant Field Values

• NEGATE_PRECEDENCE

  protected static final int NEGATE_PRECEDENCE

  negate precedence

  See Also:

  Constant Field Values

• UNION_PRECEDENCE

  protected static final int UNION_PRECEDENCE

  union precedence

  See Also:

  Constant Field Values

Constructor Detail

• CoreOperation

  public CoreOperation(Expression[] args)

  Create a new CoreOperation.

  Parameters:

  args - Expression[]

Method Detail

• compute

  public Object compute(EvalContext context)

  Description copied from class: Expression
  Evaluates the expression. If the result is a node set, returns the first element of the node set.

  Specified by:

  compute in class Expression

  Parameters:

  context - evaluation context

  Returns:

  Object

• computeValue

  public abstract Object computeValue(EvalContext context)

  Description copied from class: Expression
  Evaluates the expression. If the result is a node set, returns the first element of the node set.

  Specified by:

  computeValue in class Expression

  Parameters:

  context - evaluation context

  Returns:

  Object

• getSymbol

  public abstract String getSymbol()

  Returns the XPath symbol for this operation, e.g. "+", "div", etc.

  Returns:

  String symbol

• isSymmetric

  protected abstract boolean isSymmetric()

  Returns true if the operation is not sensitive to the order of arguments, e.g. "=", "and" etc, and false if it is, e.g. "<=", "div".

  Returns:

  boolean

• getPrecedence

  protected abstract int getPrecedence()

  Computes the precedence of the operation.

  Returns:

  int precedence

• toString

  public String toString()

  Overrides:

  toString in class Object