InMemoryExpressionFactory (OpenJPA Parent POM 2.0.0 API)

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org.apache.openjpa.kernel.exps
Class InMemoryExpressionFactory

java.lang.Object
  org.apache.openjpa.kernel.exps.InMemoryExpressionFactory

All Implemented Interfaces:: ExpressionFactory

public class InMemoryExpressionFactory
extends Object
implements ExpressionFactory
extends Object
implements ExpressionFactory

Expression factory implementation that can be used to execute queries in memory.

Author:: Abe White

Constructor Summary
`InMemoryExpressionFactory()`

Method Summary

Value abs(Value val)
Return a value representing the absolute value of the given one.

Value add(Value val1, Value val2)
Return a value representing the two values added together.

Value all(Value val)
Return an expression representing the given condition.

Expression and(Expression exp1, Expression exp2)
Return the two expressions AND'd together.

Value any(Value val)
Return an expression representing the given condition.

Expression asExpression(Value v)
Return the given value as an expression.

Value avg(Value val)
Return the average of the given value for all matches.

Expression bindKeyVariable(Value var, Value val)
Bind the given variable to the key set of the given map value.

Expression bindValueVariable(Value var, Value val)
Bind the given variable to the value set of the given map value.

Expression bindVariable(Value var, Value val)
Bind the given variable to the given collection value.

Value cast(Value val, Class cls)
Cast the value to the given class.

Value coalesceExpression(Value[] val)
Return a coalesce expression

Value concat(Value val1, Value val2)
Return a value representing the concatenation of the given target with the given args.

Expression contains(Value v1, Value v2)
Return an expression representing the given condition.

Expression containsKey(Value v1, Value v2)
Return an expression representing the given condition.

Expression containsValue(Value v1, Value v2)
Return an expression representing the given condition.

Value count(Value val)
Return the count of the given value for all matches.

List distinct(QueryExpressions exps, boolean fromExtent, List matches)
Filter the given list of matches, removing duplicate entries.

Value distinct(Value val)
Return distinct values of the given value.

Value divide(Value val1, Value val2)
Return a value representing the first value divided by the first one.

Expression emptyExpression()
Return a blank expression; this is used when the filter is empty.

Expression endsWith(Value v1, Value v2)
Return whether the first string ends with the second.

Expression equal(Value v1, Value v2)
Return an expression representing the given condition.

Value generalCaseExpression(Expression[] exp, Value val)
Return a general case expression





<T extends Date> 


Value

getCurrentDate(Class<T> dateType)
Return a value representing the current date.





<T extends Date> 


Value

getCurrentTime(Class<T> dateType)
Return a value representing the current time.





<T extends Date> 


Value

getCurrentTimestamp(Class<T> dateType)
Return a value representing the current timestamp.

Value getKey(Value val)
Path navigation thru map key

Value getMapValue(Value map, Value arg)
Return an expression representing the given condition.

Value getNull()
Return a value representing null.

Value getObjectId(Value val)
Return the object id of the given value.

Value getThis()
Return a value representing this.

Expression greaterThan(Value v1, Value v2)
Return an expression representing the given condition.

Expression greaterThanEqual(Value v1, Value v2)
Return an expression representing the given condition.

List group(QueryExpressions exps, List matches, StoreContext ctx, Object[] params)
Group the list of matches into a list of lists.

Value index(Value val)
Return an index/position of the given value within a collection/map.

Value indexOf(Value val1, Value val2)
Return a value representing the String.indexOf(int) function on the given target with the given args.

Expression isEmpty(Value v1)
Return an expression representing the given condition.

Expression isInstance(Value v1, Class c)
Return whether the first value is an instance of the given class.

Expression isNotEmpty(Value v1)
Return an expression representing the given condition.

Expression lessThan(Value v1, Value v2)
Return an expression representing the given condition.

Expression lessThanEqual(Value v1, Value v2)
Return an expression representing the given condition.

Value mapEntry(Value key, Value val)
Return the map entry of the given value.

Value mapKey(Value key, Value val)
Return the map key of the given value

boolean matches(QueryExpressions exps, ClassMetaData type, boolean subs, Object candidate, StoreContext ctx, Object[] params)
Tests whether the given candidate matches the given type and this expression.

boolean matches(QueryExpressions exps, Collection group, StoreContext ctx, Object[] params)
Return true if the given group matches the having expression.

Expression matches(Value v1, Value v2, String single, String multi, String esc)
Return whether the string matches the matching pattern.

Value max(Value val)
Return the max of the given value for all matches.

Value min(Value val)
Return the max of the given value for all matches.

Value mod(Value val1, Value val2)
Return a value representing the first value mod'd by the second one.

Value multiply(Value val1, Value val2)
Return a value representing the two values multiplied together.

Value newAggregate(AggregateListener listener, Value arg)
Return the value of the given function.

Arguments newArgumentList(Value... values)
Return a function argument list consisting of the given values, any of which may itself be an argument list.

Arguments newArgumentList(Value val1, Value val2)
Return a function argument list consisting of the given values, either of which may itself be an argument list.

Value newBoundVariable(String name, Class type)
This method will be called only once per variable bound in a contains clause, and the returned value will be reused for any further instances of the variable in subexpression of the filter string.

Parameter newCollectionValuedParameter(Object name, Class type)
Return a value representing a collection-valued parameter.

Value newExtension(FilterListener listener, Value target, Value arg)
Return the value of the given extension.

Value newFunction(String functionName, Class<?> resultType, Value... args)
Return a value representing the given datastore function with the given arguments.

Literal newLiteral(Object val, int parseType)
Return a value representing the given constant, which will be a Number, String, or Boolean instance.

Parameter newParameter(Object name, Class type)
Return a value representing a parameter for the given value.

Path newPath()
Return a value representing a path which will consist of a chain of 1 or more field names starting in the namespace of the candidate class.
Example: parent.address.city

Path newPath(Value val)
Return a value representing a path which will consist of a chain of 1 or more field names starting in the namespace of the given value.
Example: var.address.city

Subquery newSubquery(ClassMetaData candidate, boolean subs, String alias)
Return a subquery.

Literal newTypeLiteral(Object val, int parseType)
Return a value representing the given constant, which will be a Number, String, or Boolean instance.

Value newUnboundVariable(String name, Class type)
Return an unbound variable.

Expression not(Expression exp)
Return the inverse of this expression.

Expression notEqual(Value v1, Value v2)
Return an expression representing the given condition.

Expression notMatches(Value v1, Value v2, String single, String multi, String esc)
Return whether the string does not match the given pattern.

Value nullIfExpression(Value val1, Value val2)
Return a nullif expression

Expression or(Expression exp1, Expression exp2)
Return the two expressions OR'd together.

List order(QueryExpressions exps, List matches, StoreContext ctx, Object[] params)
Order the given list of matches on the given value.

List project(QueryExpressions exps, List matches, StoreContext ctx, Object[] params)
Create the projections for the given results.

Value simpleCaseExpression(Value caseOperand, Expression[] exp, Value val)
Return a simple case expression

Value size(Value val)
Return an expression representing the given condition.

Value sqrt(Value val)
Return the square root of the given value.

Expression startsWith(Value v1, Value v2)
Return whether the first string starts with the second.

Value stringLength(Value str)
Returns the number of characters in the String value.

Value substring(Value val1, Value val2)
Return a value representing the String.substring(int) function on the given target with the given args.

Value subtract(Value val1, Value val2)
Return a value representing the second value subtracted from the first.

Value sum(Value val)
Return the max of the given value for all matches.

Value toLowerCase(Value val)
Return the upper case of the given value.

Value toUpperCase(Value val)
Return the upper case of the given value.

Value trim(Value str, Value trimChar, Boolean where)
Trims the specified specified trimChar from the specified value.

Value type(Value val)
Return the type/class of the given value.

Expression whenCondition(Expression exp, Value val)
Return a when condidional clause

Expression whenScalar(Value val1, Value val2)
Return a when scalar_expression clause

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

InMemoryExpressionFactory

public InMemoryExpressionFactory()

Method Detail

matches

public boolean matches(QueryExpressions exps,
                       ClassMetaData type,
                       boolean subs,
                       Object candidate,
                       StoreContext ctx,
                       Object[] params)

Tests whether the given candidate matches the given type and this expression.

group

public List group(QueryExpressions exps,
                  List matches,
                  StoreContext ctx,
                  Object[] params)

Group the list of matches into a list of lists.

matches

public boolean matches(QueryExpressions exps,
                       Collection group,
                       StoreContext ctx,
                       Object[] params)

Return true if the given group matches the having expression.

project

public List project(QueryExpressions exps,
                    List matches,
                    StoreContext ctx,
                    Object[] params)

Create the projections for the given results.

order

public List order(QueryExpressions exps,
                  List matches,
                  StoreContext ctx,
                  Object[] params)

Order the given list of matches on the given value.

distinct

public List distinct(QueryExpressions exps,
                     boolean fromExtent,
                     List matches)

Filter the given list of matches, removing duplicate entries.