xyz.zpayh.hdimage.util

类 Preconditions

java.lang.Object

xyz.zpayh.hdimage.util.Preconditions

public final class Preconditions
extends java.lang.Object

方法概要

限定符和类型	方法和说明
static void	checkArgument(boolean expression) Ensures the truth of an expression involving one or more parameters to the calling method.
static void	checkArgument(boolean expression, java.lang.Object errorMessage) Ensures the truth of an expression involving one or more parameters to the calling method.
static void	checkArgument(boolean expression, java.lang.String errorMessageTemplate, java.lang.Object... errorMessageArgs) Ensures the truth of an expression involving one or more parameters to the calling method.
static int	checkElementIndex(int index, int size) Ensures that index specifies a valid element in an array, list or string of size size.
static int	checkElementIndex(int index, int size, java.lang.String desc) Ensures that index specifies a valid element in an array, list or string of size size.
static <T> T	checkNotNull(T reference) Ensures that an object reference passed as a parameter to the calling method is not null.
static <T> T	checkNotNull(T reference, java.lang.Object errorMessage) Ensures that an object reference passed as a parameter to the calling method is not null.
static <T> T	checkNotNull(T reference, java.lang.String errorMessageTemplate, java.lang.Object... errorMessageArgs) Ensures that an object reference passed as a parameter to the calling method is not null.
static int	checkPositionIndex(int index, int size) Ensures that index specifies a valid position in an array, list or string of size size.
static int	checkPositionIndex(int index, int size, java.lang.String desc) Ensures that index specifies a valid position in an array, list or string of size size.
static void	checkPositionIndexes(int start, int end, int size) Ensures that start and end specify a valid positions in an array, list or string of size size, and are in order.
static void	checkState(boolean expression) Ensures the truth of an expression involving the state of the calling instance, but not involving any parameters to the calling method.
static void	checkState(boolean expression, java.lang.Object errorMessage) Ensures the truth of an expression involving the state of the calling instance, but not involving any parameters to the calling method.
static void	checkState(boolean expression, java.lang.String errorMessageTemplate, java.lang.Object... errorMessageArgs) Ensures the truth of an expression involving the state of the calling instance, but not involving any parameters to the calling method.

从类继承的方法 java.lang.Object

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

方法详细资料

checkArgument

public static void checkArgument(boolean expression)

Ensures the truth of an expression involving one or more parameters to the calling method.

参数:

expression - a boolean expression

抛出:

java.lang.IllegalArgumentException - if expression is false

checkArgument

public static void checkArgument(boolean expression,
                                 @Nullable
                                 java.lang.Object errorMessage)

Ensures the truth of an expression involving one or more parameters to the calling method.

参数:

expression - a boolean expression

errorMessage - the exception message to use if the check fails; will be converted to a string using String.valueOf(Object)

抛出:

java.lang.IllegalArgumentException - if expression is false

checkArgument

public static void checkArgument(boolean expression,
                                 @Nullable
                                 java.lang.String errorMessageTemplate,
                                 @Nullable
                                 java.lang.Object... errorMessageArgs)

Ensures the truth of an expression involving one or more parameters to the calling method.

参数:

expression - a boolean expression

errorMessageTemplate - a template for the exception message should the check fail. The message is formed by replacing each %s placeholder in the template with an argument. These are matched by position - the first %s gets errorMessageArgs[0], etc. Unmatched arguments will be appended to the formatted message in square braces. Unmatched placeholders will be left as-is.

errorMessageArgs - the arguments to be substituted into the message template. Arguments are converted to strings using String.valueOf(Object).

抛出:

java.lang.IllegalArgumentException - if expression is false

java.lang.NullPointerException - if the check fails and either errorMessageTemplate or errorMessageArgs is null (don't let this happen)

checkState

public static void checkState(boolean expression)

Ensures the truth of an expression involving the state of the calling instance, but not involving any parameters to the calling method.

参数:

expression - a boolean expression

抛出:

java.lang.IllegalStateException - if expression is false

checkState

public static void checkState(boolean expression,
                              @Nullable
                              java.lang.Object errorMessage)

Ensures the truth of an expression involving the state of the calling instance, but not involving any parameters to the calling method.

参数:

expression - a boolean expression

errorMessage - the exception message to use if the check fails; will be converted to a string using String.valueOf(Object)

抛出:

java.lang.IllegalStateException - if expression is false

checkState

public static void checkState(boolean expression,
                              @Nullable
                              java.lang.String errorMessageTemplate,
                              @Nullable
                              java.lang.Object... errorMessageArgs)

Ensures the truth of an expression involving the state of the calling instance, but not involving any parameters to the calling method.

参数:

expression - a boolean expression

errorMessageTemplate - a template for the exception message should the check fail. The message is formed by replacing each %s placeholder in the template with an argument. These are matched by position - the first %s gets errorMessageArgs[0], etc. Unmatched arguments will be appended to the formatted message in square braces. Unmatched placeholders will be left as-is.

errorMessageArgs - the arguments to be substituted into the message template. Arguments are converted to strings using String.valueOf(Object).

抛出:

java.lang.IllegalStateException - if expression is false

java.lang.NullPointerException - if the check fails and either errorMessageTemplate or errorMessageArgs is null (don't let this happen)

checkNotNull

public static <T> T checkNotNull(T reference)

Ensures that an object reference passed as a parameter to the calling method is not null.

参数:

reference - an object reference

返回:

the non-null reference that was validated

抛出:

java.lang.NullPointerException - if reference is null

checkNotNull

public static <T> T checkNotNull(T reference,
                                 @Nullable
                                 java.lang.Object errorMessage)

Ensures that an object reference passed as a parameter to the calling method is not null.

参数:

reference - an object reference

errorMessage - the exception message to use if the check fails; will be converted to a string using String.valueOf(Object)

返回:

the non-null reference that was validated

抛出:

java.lang.NullPointerException - if reference is null

checkNotNull

public static <T> T checkNotNull(T reference,
                                 @Nullable
                                 java.lang.String errorMessageTemplate,
                                 @Nullable
                                 java.lang.Object... errorMessageArgs)

Ensures that an object reference passed as a parameter to the calling method is not null.

参数:

reference - an object reference

errorMessageTemplate - a template for the exception message should the check fail. The message is formed by replacing each %s placeholder in the template with an argument. These are matched by position - the first %s gets errorMessageArgs[0], etc. Unmatched arguments will be appended to the formatted message in square braces. Unmatched placeholders will be left as-is.

errorMessageArgs - the arguments to be substituted into the message template. Arguments are converted to strings using String.valueOf(Object).

返回:

the non-null reference that was validated

抛出:

java.lang.NullPointerException - if reference is null

checkElementIndex

public static int checkElementIndex(int index,
                                    int size)

Ensures that index specifies a valid element in an array, list or string of size size. An element index may range from zero, inclusive, to size, exclusive.

参数:

index - a user-supplied index identifying an element of an array, list or string

size - the size of that array, list or string

返回:

the value of index

抛出:

java.lang.IndexOutOfBoundsException - if index is negative or is not less than size

java.lang.IllegalArgumentException - if size is negative

checkElementIndex

public static int checkElementIndex(int index,
                                    int size,
                                    @Nullable
                                    java.lang.String desc)

Ensures that index specifies a valid element in an array, list or string of size size. An element index may range from zero, inclusive, to size, exclusive.

参数:

index - a user-supplied index identifying an element of an array, list or string

size - the size of that array, list or string

desc - the text to use to describe this index in an error message

返回:

the value of index

抛出:

java.lang.IndexOutOfBoundsException - if index is negative or is not less than size

java.lang.IllegalArgumentException - if size is negative

checkPositionIndex

public static int checkPositionIndex(int index,
                                     int size)

Ensures that index specifies a valid position in an array, list or string of size size. A position index may range from zero to size, inclusive.

参数:

index - a user-supplied index identifying a position in an array, list or string

size - the size of that array, list or string

返回:

the value of index

抛出:

java.lang.IndexOutOfBoundsException - if index is negative or is greater than size

java.lang.IllegalArgumentException - if size is negative

checkPositionIndex

public static int checkPositionIndex(int index,
                                     int size,
                                     @Nullable
                                     java.lang.String desc)

Ensures that index specifies a valid position in an array, list or string of size size. A position index may range from zero to size, inclusive.

参数:

index - a user-supplied index identifying a position in an array, list or string

size - the size of that array, list or string

desc - the text to use to describe this index in an error message

返回:

the value of index

抛出:

java.lang.IndexOutOfBoundsException - if index is negative or is greater than size

java.lang.IllegalArgumentException - if size is negative

checkPositionIndexes

public static void checkPositionIndexes(int start,
                                        int end,
                                        int size)

Ensures that start and end specify a valid positions in an array, list or string of size size, and are in order. A position index may range from zero to size, inclusive.

参数:

start - a user-supplied index identifying a starting position in an array, list or string

end - a user-supplied index identifying a ending position in an array, list or string

size - the size of that array, list or string

抛出:

java.lang.IndexOutOfBoundsException - if either index is negative or is greater than size, or if end is less than start

java.lang.IllegalArgumentException - if size is negative