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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.persistence.query;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
/**
* Interface for construction of query definitions
*/
public interface QueryDefinition extends Subquery {
/**
* Add a query root corresponding to the given entity, forming a cartesian
* product with any existing roots. The domain object that is returned is
* bound as a component of the given query. The argument must be an entity
* class.
*
* @param cls -
* an entity class
* @return DomainObject corresponding to the specified entity class.
*/
DomainObject addRoot(Class cls);
/**
* Add a root derived from a domain object of the containing query
* definition to a query definition used as a subquery. Provides support for
* correlated subqueries. Joins against the resulting domain object do not
* affect the query domain of the containing query. The path expression must
* correspond to an entity class. The path expression must not be a domain
* object of the containing query.
*
* @param path -
* path expression corresponding to the domain object used to
* derive the subquery root.
* @return the subquery DomainObject
*/
DomainObject addSubqueryRoot(PathExpression path);
/**
* Specify the objects / values to be returned. Replaces the previous select
* list, if any. If no select items are specified and there is only one
* query root, the root entity is assumed to be the result.
*
* @param selectItems -
* one or more SelectItem instances
* @return the modified query definition instance
*/
QueryDefinition select(SelectItem... selectItems);
/**
* Specify the objects / values to be returned. Replaces the previous select
* list, if any. If no select items are specified and there is only one
* query root, the root entity is assumed to be the result.
*
* @param selectItemList -
* a list containing one or more SelectItem instances
* @return the modified query definition instance
*/
QueryDefinition select(List selectItemList);
/**
* Specify the objects / values to be returned. Duplicate results will be
* eliminated. Replaces the previous select list, if any. If no select items
* are specified and there is only one query root, the root entity is
* assumed to be the result.
*
* @param selectItems -
* one or more SelectItem instances
* @return the modified query definition instance
*/
QueryDefinition selectDistinct(SelectItem... selectItems);
/**
* Specify the objects / values to be returned. Duplicate results will be
* eliminated. Replaces the previous select list, if any. If no select items
* are specified, and there is only one query root, the root entity is
* assumed to be the result. is assumed to be the result.
*
* @param selectItemList -
* a list containing one or more SelectItem instances
* @return the modified query definition instance
*/
QueryDefinition selectDistinct(List selectItemList);
/**
* Modifies the query definition to restrict the result of the query
* according to the specified predicate. Replaces the previously added
* restriction(s), if any.
*
* @param predicate -
* a simple or compound conditional predicate
* @return the modified QueryDefinition instance
*/
QueryDefinition where(Predicate predicate);
/**
* Specify the items of the select list that are used in ordering the query
* results. Replaces the previous order-by list, if any.
*
* @param orderByItems -
* one or more OrderByItem instances
* @return the modified QueryDefinition instance
*/
QueryDefinition orderBy(OrderByItem... orderByItems);
/**
* Specify the items of the select list that are used in ordering the query
* results. Replaces the previous order-by list, if any.
*
* @param orderByItemList -
* a list containing one or more OrderByItem
* instances
* @return the modified QueryDefinition instance
*/
QueryDefinition orderBy(List orderByItemList);
/**
* Specify the items that are used to form groups over the query results.
* Replaces the previous group-by list, if any.
*
* @param pathExprs
* @return the modified QueryDefinition instance
*/
QueryDefinition groupBy(PathExpression... pathExprs);
/**
* Specify the items that are used to form groups over the query results.
* Replaces the previous group-by list, if any.
*
* @param pathExprList
* @return the modified QueryDefinition instance
*/
QueryDefinition groupBy(List pathExprList);
/**
* Specify the restrictions over the groups of a query. Replaces the
* previous having restriction(s), if any.
*
* @param predicate
* @return the modified QueryDefinition Instance
*/
QueryDefinition having(Predicate predicate);
/**
* Specify that a constructor for the given class is to be applied to the
* corresponding query results after the query is executed. The class must
* have a constructor that accepts the Java argument types corresponding to
* the given select items.
*
* @param cls -
* a class with the correponding constructor
* @param args -
* select items that correspond to result types that are valid
* as arguments to the constructor
* @result SelectItem instance representing the constructor
*/
SelectItem newInstance(Class cls, SelectItem... args);
/**
* Use the query definition instance as a subquery in an exists predicate.
*
* @return the resulting predicate
*/
Predicate exists();
/**
* Use the query definition object in a subquery in an all expression.
*
* @return the resulting Subquery
*/
Subquery all();
/**
* Use the query definition object in a subquery in an any expression.
*
* @return the resulting Subquery
*/
Subquery any();
/**
* Use the query definition object in a subquery in a some expression.
*
* @return the resulting Subquery
*/
Subquery some();
/**
* Create an empty general case expression. A general case expression is of
* the form:
*
* generalCase() .when(conditional-predicate).then(scalar-expression)
* .when(conditional-predicate).then(scalar-expression) ...
* .elseCase(scalar-expression)
*
* @return empty general case expression
*/
CaseExpression generalCase();
/**
* Create a simple case expression with the given case operand. A simple
* case expression is of the form:
*
* simpleCase(case-operand) .when(scalar-expression).then(scalar-expression)
* .when(scalar-expression).then(scalar-expression) ...
* .elseCase(scalar-expression)
*
* @param caseOperand -
* expression used for testing against the when scalar
* expressions
* @return case expression with the given case operand
*/
CaseExpression simpleCase(Expression caseOperand);
/**
* Create a simple case expression with the given case operand. A simple
* case expression is of the form:
*
* simpleCase(case-operand) .when(scalar-expression).then(scalar-expression)
* .when(scalar-expression).then(scalar-expression) ...
* .elseCase(scalar-expression)
*
* @param caseOperand -
* numeric value used for testing against the when scalar
* expressions
* @return case expression with the given case operand
*/
CaseExpression simpleCase(Number caseOperand);
/**
* Create a simple case expression with the given case operand. A simple
* case expression is of the form:
*
* simpleCase(case-operand) .when(scalar-expression).then(scalar-expression)
* .when(scalar-expression).then(scalar-expression) ...
* .elseCase(scalar-expression)
*
* @param caseOperand -
* value used for testing against the when scalar
* expressions
* @return case expression with the given case operand
*/
CaseExpression simpleCase(String caseOperand);
/**
* Create a simple case expression with the given case operand. A simple
* case expression is of the form:
*
* simpleCase(case-operand) .when(scalar-expression).then(scalar-expression)
* .when(scalar-expression).then(scalar-expression) ...
* .elseCase(scalar-expression)
*
* @param caseOperand -
* value used for testing against the when scalar
* expressions
* @return case expression with the given case operand
*/
CaseExpression simpleCase(Date caseOperand);
/**
* Create a simple case expression with the given case operand. A simple
* case expression is of the form:
*
* simpleCase(case-operand) .when(scalar-expression).then(scalar-expression)
* .when(scalar-expression).then(scalar-expression) ...
* .elseCase(scalar-expression)
*
* @param caseOperand -
* value used for testing against the when scalar
* expressions
* @return case expression with the given case operand
*/
CaseExpression simpleCase(Calendar caseOperand);
/**
* Create a simple case expression with the given case operand. A simple
* case expression is of the form:
*
* simpleCase(case-operand) .when(scalar-expression).then(scalar-expression)
* .when(scalar-expression).then(scalar-expression) ...
* .elseCase(scalar-expression)
*
* @param caseOperand -
* value used for testing against the when scalar
* expressions
* @return case expression with the given case operand
*/
CaseExpression simpleCase(Class caseOperand);
/**
* Create a simple case expression with the given case operand. A simple
* case expression is of the form:
*
* simpleCase(case-operand) .when(scalar-expression).then(scalar-expression)
* .when(scalar-expression).then(scalar-expression) ...
* .elseCase(scalar-expression)
*
* @param caseOperand -
* value used for testing against the when scalar
* expressions
* @return case expression with the given case operand
*/
CaseExpression simpleCase(Enum caseOperand);
/**
* coalesce This is equivalent to a case expression that returns null if all
* its arguments evaluate to null, and the value of its first non-null
* argument otherwise.
*
* @param exp -
* expressions to be used for testing against null
* @return Expression corresponding to the given coalesce expression
*/
Expression coalesce(Expression... exp);
/**
* coalesce This is equivalent to a case expression that returns null if all
* its arguments evaluate to null, and the value of its first non-null
* argument otherwise.
*
* @param exp -
* expressions to be used for testing against null
* @return Expression corresponding to the given coalesce expression
*/
Expression coalesce(String... exp);
/**
* coalesce This is equivalent to a case expression that returns null if all
* its arguments evaluate to null, and the value of its first non-null
* argument otherwise.
*
* @param exp -
* expressions to be used for testing against null
* @return Expression corresponding to the given coalesce expression
*/
Expression coalesce(Date... exp);
/**
* coalesce This is equivalent to a case expression that returns null if all
* its arguments evaluate to null, and the value of its first non-null
* argument otherwise.
*
* @param exp -
* expressions to be used for testing against null
* @return Expression corresponding to the given coalesce expression
*/
Expression coalesce(Calendar... exp);
/**
* nullif This is equivalent to a case expression that tests whether its
* arguments are equal, returning null if they are and the value of the
* first expression if they are not.
*
* @param exp1
* @param exp2
* @return Expression corresponding to the given nullif expression
*/
Expression nullif(Expression exp1, Expression exp2);
/**
* nullif This is equivalent to a case expression that tests whether its
* arguments are equal, returning null if they are and the value of the
* first expression if they are not.
*
* @param arg1
* @param arg2
* @return Expression corresponding to the given nullif expression
*/
Expression nullif(Number arg1, Number arg2);
/**
* nullif This is equivalent to a case expression that tests whether its
* arguments are equal, returning null if they are and the value of the
* first expression if they are not.
*
* @param arg1
* @param arg2 Criteria API Java Persistence 2.0, Public Review Draft
* Criteria API Interfaces 10/31/08 158 JSR-317 Public Review
* Draft Sun Microsystems, Inc.
* @return Expression corresponding to the given nullif expression
*/
Expression nullif(String arg1, String arg2);
/**
* nullif This is equivalent to a case expression that tests whether its
* arguments are equal, returning null if they are and the value of the
* first expression if they are not.
*
* @param arg1
* @param arg2
* @return Expression corresponding to the given nullif expression
*/
Expression nullif(Date arg1, Date arg2);
/**
* nullif This is equivalent to a case expression that tests whether its
* arguments are equal, returning null if they are and the value of the
* first expression if they are not.
*
* @param arg1
* @param arg2
* @return Expression corresponding to the given nullif expression
*/
Expression nullif(Calendar arg1, Calendar arg2);
/**
* nullif This is equivalent to a case expression that tests whether its
* arguments are equal, returning null if they are and the value of the
* first expression if they are not.
*
* @param arg1
* @param arg2
* @return Expression corresponding to the given nullif expression
*/
Expression nullif(Class arg1, Class arg2);
/**
* nullif This is equivalent to a case expression that tests whether its
* arguments are equal, returning null if they are and the value of the
* first expression if they are not.
*
* @param arg1
* @param arg2
* @return Expression corresponding to the given nullif expression
*/
Expression nullif(Enum arg1, Enum arg2);
/**
* Create a predicate value from the given boolean.
*
* @param b boolean value
* @return a true or false predicate
*/
Predicate predicate(boolean b);
/**
* Create an Expression corresponding to the current time on the database
* server at the time of query execution.
*
* @return the corresponding Expression
*/
Expression currentTime();
/**
* Create an Expression corresponding to the current date on the database
* server at the time of query execution.
*
* @return the corresponding Expression
*/
Expression currentDate();
/**
* Create an Expression corresponding to the current timestamp on the
* database server at the time of query execution.
*
* @return the corresponding Expression
*/
Expression currentTimestamp();
/**
* Create an Expression corresponding to a String value.
*
* @param s -
* string value
* @return the corresponding Expression literal
*/
Expression literal(String s);
/**
* Create an Expression corresponding to a numeric value.
*
* @param n -
* numeric value
* @return the corresponding Expression literal
*/
Expression literal(Number n);
/**
* Create an Expression corresponding to a boolean value.
*
* @param b -
* boolean value
* @return the corresponding Expression literal
*/
Expression literal(boolean b);
/**
* Create an Expression corresponding to a Calendar value.
*
* @param c -
* Calendar value
* @return the corresponding Expression literal
*/
Expression literal(Calendar c);
/**
* Create an Expression corresponding to a Date value.
*
* @param d -
* Date value
* @return the corresponding Expression literal
*/
Expression literal(Date d);
/**
* Create an Expression corresponding to a character value.
*
* @param character value
* @return the corresponding Expression literal
*/
Expression literal(char c);
/**
* Create an Expression corresponding to an entity class.
*
* @param cls -
* entity class
* @return the corresponding Expression literal
*/
Expression literal(Class cls);
/**
* Create an Expression corresponding to an enum.
*
* @param e -
* enum
* @return the corresponding Expression literal
*/
Expression literal(Enum e);
/**
* Create an Expression corresponding to a null value.
*
* @return the corresponding Expression literal
*/
Expression nullLiteral();
/**
* Specify use of a parameter of the given name.
*
* @param parameter name
* @return an Expression corresponding to a named parameter
*/
Expression param(String name);
}
