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Oracle Fusion Middleware Java API Reference for Oracle TopLink 11g Release 1 (11.1.1) E28847-01 |
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java.lang.Object
org.eclipse.persistence.jpa.jpql.ExpressionTools
public final class ExpressionTools
A utility class containing various methods related to the Hermes parser.
Field Summary | |
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static java.lang.Object[] |
EMPTY_ARRAY The constant of an empty array. |
static java.lang.String |
EMPTY_STRING The constant for an empty string. |
static java.lang.String[] |
EMPTY_STRING_ARRAY The constant of an empty String array. |
Constructor Summary | |
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private |
ExpressionTools() ExpressionTools cannot be instantiated. |
Method Summary | |
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static java.lang.String |
escape(java.lang.CharSequence value, int[] position) Converts the escape characters contained in the given CharSequence to their literal representation. |
static boolean |
isParameter(char character) Determines whether the given character is the character used to identify an input parameter, either a named parameter or position parameter. |
static boolean |
isQuote(char character) Determines whether the given character is the single or double quote. |
static java.lang.String |
parseLiteral(WordParser wordParser) Retrieves the first word from the given text starting at the specified position. |
static int |
repositionCursor(java.lang.CharSequence query1, int position1, java.lang.CharSequence query2) Re-adjusts the given position, which is based on query1, by making sure it is pointing at the same position within query2. |
static boolean |
stringIsEmpty(java.lang.CharSequence text) Determines whether the specified string is null , empty, or contains only whitespace characters. |
static boolean |
stringIsNotEmpty(java.lang.CharSequence text) Determines whether the specified string is NOT null , NOT empty, or contains at least one non-whitespace character. |
static java.lang.String |
unescape(java.lang.CharSequence value, int[] position) Converts the string representation of the escape characters contained by the given CharSequence into the actual escape characters. |
static java.lang.String |
unquote(java.lang.String text) Returns the string literal without the single or double quotes. |
static boolean |
valuesAreDifferent(java.lang.Object value1, java.lang.Object value2) Determines whether the values are different, with the appropriate null checks. |
static boolean |
valuesAreEqual(java.lang.Object value1, java.lang.Object value2) Determines whether the values are equal or equivalent, with the appropriate null checks. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final java.lang.Object[] EMPTY_ARRAY
public static final java.lang.String EMPTY_STRING
public static final java.lang.String[] EMPTY_STRING_ARRAY
Constructor Detail |
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private ExpressionTools()
Method Detail |
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public static java.lang.String escape(java.lang.CharSequence value, int[] position)
CharSequence
to their literal representation. For example, '\b' is converted to '\\b'.value
- The sequence of characters to convert any escape characterposition
- This is a one element array that needs to be adjusted when an escape character is convertedpublic static boolean isParameter(char character)
character
- The character to check if it's a parametertrue
if the given character is either : or ?; false
otherwisepublic static boolean isQuote(char character)
character
- The character to check if it's a quotetrue
if the given character is either ' or "; false
otherwisepublic static java.lang.String parseLiteral(WordParser wordParser)
text
- The text from which the first word will be retrievedposition
- The position of the cursor where to start retrieving the wordpublic static int repositionCursor(java.lang.CharSequence query1, int position1, java.lang.CharSequence query2)
query1
- The query associated to the positionposition1
- The position within query1query2
- The query for which the position might need adjustmentpublic static boolean stringIsEmpty(java.lang.CharSequence text)
null
, empty, or contains only whitespace characters.text
- The sequence of character to test if it is null
or only contains whitespacetrue
if the given string is null
or only contains whitespace; false
otherwisepublic static boolean stringIsNotEmpty(java.lang.CharSequence text)
null
, NOT empty, or contains at least one non-whitespace character.text
- The sequence of character to test if it is NOT null
or does not only contain whitespacetrue
if the given string is NOT null
or has at least one non-whitespace character; false
otherwisepublic static java.lang.String unescape(java.lang.CharSequence value, int[] position)
CharSequence
into the actual escape characters. For example, the string '\\b' is converted into the character value '\b'.value
- The sequence of characters to convert to an escaped versionposition
- This is a one element array that needs to be adjusted when an escape character is convertedpublic static java.lang.String unquote(java.lang.String text)
text
- The original text to unquote if it has ' at the beginning and the endpublic static boolean valuesAreDifferent(java.lang.Object value1, java.lang.Object value2)
null
checks.value1
- The first value to check for equality and equivalencyvalue2
- The second value to check for equality and equivalencytrue
if both values are different; true
if they are both null
, equal or equivalentpublic static boolean valuesAreEqual(java.lang.Object value1, java.lang.Object value2)
null
checks.value1
- The first value to check for equality and equivalencyvalue2
- The second value to check for equality and equivalencytrue
if both values are null
, equal or equivalent; false
otherwise
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