org.apache.openjpa.kernel
Class Filters

java.lang.Object
  org.apache.openjpa.kernel.Filters

public class Filters
extends Object

Helper methods for dealing with query filters.

Author:

Abe White

Constructor Summary

Filters()

Method Summary

static Object	add(Object o1, Class<?> c1, Object o2, Class<?> c2) Add the given values.
static List<ClassMetaData>	addAccessPathMetaDatas(List<ClassMetaData> metas, ClassMetaData[] path) Add the given access path metadatas to the full path list, making sure to maintain only base metadatas in the list.
static boolean	canConvert(Class<?> c1, Class<?> c2, boolean strict) Return whether an instance of the first class can be converted to an instance of the second.
static String	clip(String s, String first, String last, boolean fail) Removes the first and last string if they are the terminal sequence in the given string.
static Object	convert(Object o, Class<?> type)
static Object	convert(Object o, Class<?> type, boolean strictNumericConversion) Convert the given value to the given type.
static Object	convertToMatchMethodArgument(Object o, Method method) Convert the given value to match the given (presumably a setter) method argument type.
static Object	divide(Object o1, Class<?> c1, Object o2, Class<?> c2) Divide the given values.
static Object	getDefaultForNull(Class<?> nType)
static AggregateListener	hintToAggregateListener(Object hint, ClassLoader loader) Convert the user-given hint value to an aggregate listener.
static AggregateListener[]	hintToAggregateListeners(Object hint, ClassLoader loader) Convert the user-given hint value to an array of aggregate listeners.
static FilterListener	hintToFilterListener(Object hint, ClassLoader loader) Convert the user-given hint value to a filter listener.
static FilterListener[]	hintToFilterListeners(Object hint, ClassLoader loader) Convert the user-given hint value to an array of filter listeners.
static Object	hintToGetter(Object target, String hintKey) Return the value of the property named by the hint key.
static void	hintToSetter(Object target, String hintKey, Object value) Set the value of the property named by the hint key.
static boolean	isJDBCTemporalSyntax(String s) Affirms if the given String is enclosed in {}.
static boolean	isTemporalType(Class<?> c) Affirms if the given class is Data, Time or Timestamp.
static Object	mod(Object o1, Class<?> c1, Object o2, Class<?> c2) Mod the given values.
static Object	multiply(Object o1, Class<?> c1, Object o2, Class<?> c2) Multiply the given values.
static List<String>	parseDeclaration(String dec, char split, String decType) Parses the given declarations into a list of type, name, type, name...
static Object	parseJDBCTemporalSyntax(String s) Parses the given string assuming it is a JDBC key expression.
static Class<?>	promote(Class<?> c1, Class<?> c2) Given two types, return type they should both be converted to before performing any operations between them.
static List<String>	splitExpressions(String str, char split, int expected) Split the given expression list into distinct expressions.
static Object	subtract(Object o1, Class<?> c1, Object o2, Class<?> c2) Subtract the given values.
static Class<?>	unwrap(Class<?> c) Return the correct primitive type for the given class, if it is a wrapper.
static Class<?>	wrap(Class<?> c) Return the correct wrapper type for the given class.

Methods inherited from class java.lang.Object

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

Constructor Detail

Filters

public Filters()

Method Detail

wrap

public static Class<?> wrap(Class<?> c)

Return the correct wrapper type for the given class.

unwrap

public static Class<?> unwrap(Class<?> c)

Return the correct primitive type for the given class, if it is a wrapper.

promote

public static Class<?> promote(Class<?> c1,
                               Class<?> c2)

Given two types, return type they should both be converted to before performing any operations between them.

canConvert

public static boolean canConvert(Class<?> c1,
                                 Class<?> c2,
                                 boolean strict)

Return whether an instance of the first class can be converted to an instance of the second.

convertToMatchMethodArgument

public static Object convertToMatchMethodArgument(Object o,
                                                  Method method)

Convert the given value to match the given (presumably a setter) method argument type.

Parameters:

o - given value

method - a presumably setter method

Returns:

the same value if the method does not have one and only one input argument.

convert

public static Object convert(Object o,
                             Class<?> type)

convert

public static Object convert(Object o,
                             Class<?> type,
                             boolean strictNumericConversion)

Convert the given value to the given type.

add

public static Object add(Object o1,
                         Class<?> c1,
                         Object o2,
                         Class<?> c2)

Add the given values.

subtract

public static Object subtract(Object o1,
                              Class<?> c1,
                              Object o2,
                              Class<?> c2)

Subtract the given values.

multiply

public static Object multiply(Object o1,
                              Class<?> c1,
                              Object o2,
                              Class<?> c2)

Multiply the given values.

divide

public static Object divide(Object o1,
                            Class<?> c1,
                            Object o2,
                            Class<?> c2)

Divide the given values.

mod

public static Object mod(Object o1,
                         Class<?> c1,
                         Object o2,
                         Class<?> c2)

Mod the given values.

parseDeclaration

public static List<String> parseDeclaration(String dec,
                                            char split,
                                            String decType)

Parses the given declarations into a list of type, name, type, name... Returns null if no declarations. Assumes declaration is not an empty string and is already trimmed (valid assumptions given the checks made in our setters).

Parameters:

decType - the type of declaration being parsed, for use in error messages

splitExpressions

public static List<String> splitExpressions(String str,
                                            char split,
                                            int expected)

Split the given expression list into distinct expressions. Assumes the given string is not null or of zero length and is already trimmed (valid assumptions given the checks in our setters and before this method call).

addAccessPathMetaDatas

public static List<ClassMetaData> addAccessPathMetaDatas(List<ClassMetaData> metas,
                                                         ClassMetaData[] path)

Add the given access path metadatas to the full path list, making sure to maintain only base metadatas in the list. The given list may be null.

hintToAggregateListener

public static AggregateListener hintToAggregateListener(Object hint,
                                                        ClassLoader loader)

Convert the user-given hint value to an aggregate listener. The hint can be an aggregate listener instance or class name.

hintToAggregateListeners

public static AggregateListener[] hintToAggregateListeners(Object hint,
                                                           ClassLoader loader)

Convert the user-given hint value to an array of aggregate listeners. The hint can be an aggregate listener, aggregate listener array, collection, or comma-separated class names.

hintToFilterListener

public static FilterListener hintToFilterListener(Object hint,
                                                  ClassLoader loader)

Convert the user-given hint value to a filter listener. The hint can be a filter listener instance or class name.

hintToFilterListeners

public static FilterListener[] hintToFilterListeners(Object hint,
                                                     ClassLoader loader)

Convert the user-given hint value to an array of filter listeners. The hint can be a filter listener, filter listener array, collection, or comma-separated class names.

hintToGetter

public static Object hintToGetter(Object target,
                                  String hintKey)

Return the value of the property named by the hint key.

hintToSetter

public static void hintToSetter(Object target,
                                String hintKey,
                                Object value)

Set the value of the property named by the hint key.

parseJDBCTemporalSyntax

public static Object parseJDBCTemporalSyntax(String s)

Parses the given string assuming it is a JDBC key expression. Extracts the data portion and based on the key, calls static java.sql.Date/Time/Timestamp.valueOf(String) method to convert to a java.sql.Date/Time/Timestamp instance.

isJDBCTemporalSyntax

public static boolean isJDBCTemporalSyntax(String s)

Affirms if the given String is enclosed in {}.

clip

public static String clip(String s,
                          String first,
                          String last,
                          boolean fail)

Removes the first and last string if they are the terminal sequence in the given string.

Parameters:

s - a string to be examined

first - the characters in the beginning of the given string

last - the characters in the end of the given string

fail - if true throws exception if the given string does not have the given terminal sequences.

Returns:

the string with terminal sequences removed.

isTemporalType

public static boolean isTemporalType(Class<?> c)

Affirms if the given class is Data, Time or Timestamp.

getDefaultForNull

public static Object getDefaultForNull(Class<?> nType)