Class CoreOperation

Known Direct Subclasses:: CoreOperationAdd, CoreOperationAnd, CoreOperationCompare, CoreOperationDivide, CoreOperationGreaterThan, CoreOperationGreaterThanOrEqual, CoreOperationLessThan, CoreOperationLessThanOrEqual, CoreOperationMod, CoreOperationMultiply, CoreOperationNegate, CoreOperationOr, CoreOperationSubtract, CoreOperationUnion

public abstract class CoreOperation

extends Operation

The common subclass for tree elements representing core operations like "+", "- ", "*" etc.

$Revision: 1.14 $ $Date: 2004/02/29 14:17:39 $

Nested classes/interfaces inherited from class org.apache.commons.jxpath.ri.compiler.Expression
`Expression.PointerIterator`, `Expression.ValueIterator`

Fields inherited from class org.apache.commons.jxpath.ri.compiler.Operation
`args`

Fields inherited from class org.apache.commons.jxpath.ri.compiler.Expression
`NOT_A_NUMBER`, `ONE`, `ZERO`

Constructor Summary
`CoreOperation(args[] )`

Method Summary
`Object`	`compute(EvalContext context)`
`abstract Object`	`computeValue(EvalContext context)`
`protected abstract int`	`getPrecedence()` Computes the precedence of the operation.
`abstract String`	`getSymbol()` Returns the XPath symbol for this operation, e.g.
`protected abstract boolean`	`isSymmetric()` Returns true if the operation is not sensitive to the order of arguments, e.g.
`String`	`toString()`

Methods inherited from class org.apache.commons.jxpath.ri.compiler.Operation
`computeContextDependent`, `getArguments`

Methods inherited from class org.apache.commons.jxpath.ri.compiler.Expression
`compute`, `computeContextDependent`, `computeValue`, `isContextDependent`, `iterate`, `iteratePointers`

public CoreOperation(args[] )

public Object compute(EvalContext context)

Overrides:
compute in interface Expression

public abstract Object computeValue(EvalContext context)

Overrides:
computeValue in interface Expression

protected abstract int getPrecedence()

Computes the precedence of the operation.

public abstract String getSymbol()

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

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".

public String toString()

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