com.sap.cloud.sdk.service.prov.api.filter

Class ExpressionAPIUtility

java.lang.Object

com.sap.cloud.sdk.service.prov.api.filter.ExpressionAPIUtility

public class ExpressionAPIUtility
extends Object

Provides methods for working with expression trees.

Constructor Summary

Constructors

Constructor and Description
ExpressionAPIUtility()

Method Summary

Modifier and Type	Method and Description
List<ExpressionNode>	getChildren(ExpressionNode filterTreeNode) Gets all the children of a filter expression tree.
List<ExpressionNode>	getLeafUnits(Expression filterTreeNode) Gets all the leaf units of the expression tree.
List<ExpressionNode>	getNodes(Expression filterTreeNode) Gets all the nodes from a filter expression tree.
boolean	hasFunction(ExpressionNode currentNode, ExpressionOperatorTypes.FUNCTION function) Checks whether a function is used in a filter expression.
boolean	hasOperator(ExpressionNode currentNode, ExpressionOperatorTypes.OPERATOR operator) Checks whether an operator is used in a filter expression.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExpressionAPIUtility

public ExpressionAPIUtility()

Method Detail

getLeafUnits

public List<ExpressionNode> getLeafUnits(Expression filterTreeNode)

Gets all the leaf units of the expression tree. A leaf unit is a node with at least one leaf node as its child. For example, Name eq 'John' is a leaf unit within a bigger filter expression tree.

Parameters:

filterTreeNode - Represents the filter expression tree

Returns:

A list of leaf units from the filter expression tree

getNodes

public List<ExpressionNode> getNodes(Expression filterTreeNode)

Gets all the nodes from a filter expression tree.

Parameters:

filterTree - An ExpressionNode object which is the root node of a filter expression tree

Returns:

A list of ExpressionNode objects containing all nodes of a given filter expression tree

getChildren

public List<ExpressionNode> getChildren(ExpressionNode filterTreeNode)

Gets all the children of a filter expression tree. Each child could be a node or an entire filter expression tree.

Parameters:

filterTreeNode - A filter expression tree

Returns:

A list of ExpressionNode objects containing the children of the filter expression

hasOperator

public boolean hasOperator(ExpressionNode currentNode,
                           ExpressionOperatorTypes.OPERATOR operator)

Checks whether an operator is used in a filter expression.

Parameters:

currentNode - ExpressionNode containing the filter expression

operator - Operator being searched in the filter expression

Returns:

A boolean indicating whether the operator is present in the filter expression

hasFunction

public boolean hasFunction(ExpressionNode currentNode,
                           ExpressionOperatorTypes.FUNCTION function)

Checks whether a function is used in a filter expression. Examples of functions include Concat, Contains, and so on.

Parameters:

currentNode - ExpressionNode containing the filter expression

function - Function being searched in the filter expression

Returns:

A boolean indicating whether the function is present in the filter expression