com.redhat.lightblue.query

Class QueryExpression

java.lang.Object

com.redhat.lightblue.util.JsonObject

com.redhat.lightblue.query.QueryExpression

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

ComparisonExpression, LogicalExpression, UpdateQueryExpression

public abstract class QueryExpression
extends JsonObject

Base class for all query expressions

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
QueryExpression()

Method Summary

Methods

Modifier and Type	Method and Description
QueryExpression	bind(List<FieldBinding> bindingResult, Set<Path> bindRequest)
QueryExpression	bind(Path ctx, List<FieldBinding> bindingResult, Set<Path> bindRequest) Binds all the bindable fields in the bindRequest, populates the bindingResult with binding information, and return a new QueryExpression with bound values.
static QueryExpression	fromJson(com.fasterxml.jackson.databind.JsonNode node) Parses a query expression from the given json node
List<QueryInContext>	getBindableClauses() Returns the query expressions that can be bound to a value These clauses are bindable: FieldComparisonExpression NaryFieldRelationalExpression
void	getBindableClauses(List<QueryInContext> list, Path ctx) Adds the query expressions that can be bound to a value to the given list
List<FieldInfo>	getQueryFields() Returns field information about the query
void	getQueryFields(List<FieldInfo> fields) Returns field information about the query
void	getQueryFields(List<FieldInfo> fields, Path ctx) The implementation should populate the list with the field information
boolean	isRequired(Path field) Returns if the field is required to evaluate this query
boolean	isRequired(Path field, Path ctx) Returns if the field is required to evaluate this query

Methods inherited from class com.redhat.lightblue.util.JsonObject

getFactory, getSourceNode, toJson, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

QueryExpression

public QueryExpression()

Method Detail

getQueryFields

public List<FieldInfo> getQueryFields()

Returns field information about the query

getQueryFields

public void getQueryFields(List<FieldInfo> fields)

Returns field information about the query

Parameters:

fields - The call adds the field information to this list

getQueryFields

public void getQueryFields(List<FieldInfo> fields,
                  Path ctx)

The implementation should populate the list with the field information

getBindableClauses

public List<QueryInContext> getBindableClauses()

Returns the query expressions that can be bound to a value These clauses are bindable:

• FieldComparisonExpression
• NaryFieldRelationalExpression

getBindableClauses

public void getBindableClauses(List<QueryInContext> list,
                      Path ctx)

Adds the query expressions that can be bound to a value to the given list

bind

public QueryExpression bind(List<FieldBinding> bindingResult,
                   Set<Path> bindRequest)

bind

public QueryExpression bind(Path ctx,
                   List<FieldBinding> bindingResult,
                   Set<Path> bindRequest)

Binds all the bindable fields in the bindRequest, populates the bindingResult with binding information, and return a new QueryExpression with bound values.

Parameters:

ctx - Context

bindingResult - The results of the bindings will be added to this list

bindRequest - Full paths to the fields to be bound. If there are array elements, '*' must be used

Returns:

A new instance of the query object with boun values. If there are no bindable values, the same query object will be returned.

fromJson

public static QueryExpression fromJson(com.fasterxml.jackson.databind.JsonNode node)

Parses a query expression from the given json node

isRequired

public boolean isRequired(Path field)

Returns if the field is required to evaluate this query

Parameters:

field - The field

isRequired

public boolean isRequired(Path field,
                 Path ctx)

Returns if the field is required to evaluate this query

Parameters:

field - The field

ctx - The nested context