Package com.github.mhewedy.expressions

Class Expressions

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<String,Object>

com.github.mhewedy.expressions.Expressions

All Implemented Interfaces:

Serializable, Cloneable, Map<String,Object>

public class Expressions
extends HashMap<String,Object>

Represents Group of expression using mongodb query api.

Example:

 {
     "status": "A",
     "$or": [{ "qty": { "$lt": 30 } }, { "item": { "$in": ["A", "D"] } }]
 }
 

Support a list of Operators defined in Operator.

See Also:

ExpressionsRepository.findAll(Expressions), ExpressionsRepository.findAll(Expressions, Sort), ExpressionsRepository.findAll(Expressions, Pageable), Mongo Query Documents, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
Expressions()

Method Summary

Modifier and Type	Method	Description
Expressions	and(Expression expression)	Add the parameter expression to the list of expression in the expressions object.
Expressions	or(Expression expression)	Create a new $or expression on the root, then adds to it the current expressions attached at the root and the expression passes as parameter.

Methods inherited from class java.util.HashMap

clear, clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, get, getOrDefault, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Detail

Expressions

public Expressions()

Method Detail

or

public Expressions or(Expression expression)

Create a new $or expression on the root, then adds to it the current expressions attached at the root and the expression passes as parameter.

Example: Suppose we have the following expression as json:

 {"firstName": "ali"} 

Then we added the following:

  expressions.or(Expression.and(
          Expression.of("lastName", Operator.$eq, "ibrahim"),
          Expression.of("age", Operator.$gte, 10)
  ));
 

Then the output could be represented as:

 {
     "$or": [
          {"firstName": "ali"},
          {
              "$and": [
                  {"lastName": "ibrahim"},
                  {"age": {"$gte": 10}},
              ]
          }
     ]
 }
 

Or in sql as:

  where firstName = "ali" or lastName = "ibrahim" and age >= 10
 

and

public Expressions and(Expression expression)

Add the parameter expression to the list of expression in the expressions object.

Example: Suppose we have the following expression as json:

 {"firstName": "ali"} 

Then we added the following:

  expressions.and(Expression.of("birthDate", Operator.$gt, "1980-10-10"));
  expressions.and(Expression.or(
      Expression.of("lastName", Operator.$eq, "ibrahim"),
      Expression.of("age", Operator.$in, 10, 30)
  ));

 

Then the output could be represented as:

 {
     "firstName": "ali",
     "birthDate": {"$gt": "1980-10-10"},
     "$or": [
          {"lastName": "ibrahim"},
          {"age": {"$in": [10, 30]}}
     ]
 }
 

Or in sql as:

 where firstName = "ali" and birthDate > "1980-10-10"
     and (lastName = "ibrahim" or age in (10, 30) )