CoreUtils (Azure SDK for Java Reference Documentation)

java.lang.Object
- com.azure.core.util.CoreUtils

```
public final class CoreUtils
extends Object
```
This class contains utility methods useful for building client libraries.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static <T> String`	`arrayToString(T[] array, Function<T,String> mapper)` Turns an array into a string mapping each element to a string and delimits them using a coma.
`static String`	`bomAwareToString(byte[] bytes, String contentType)` Attempts to convert a byte stream into the properly encoded String.
`static byte[]`	`clone(byte[] source)` Creates a copy of the source byte array.
`static int[]`	`clone(int[] source)` Creates a copy of the source int array.
`static <T> T[]`	`clone(T[] source)` Creates a copy of the source array.
`static <T> org.reactivestreams.Publisher<T>`	`extractAndFetch(PagedResponse<T> page, Context context, BiFunction<String,Context,org.reactivestreams.Publisher<T>> content)` Extracts and combines the generic items from all the pages linked together.
`static <T> T`	`findFirstOfType(Object[] args, Class<T> clazz)` Returns the first instance of the given class from an array of Objects.
`static String`	`getApplicationId(ClientOptions clientOptions, HttpLogOptions logOptions)` Retrieves the application ID from either a `ClientOptions` or `HttpLogOptions`.
`static Map<String,String>`	`getProperties(String propertiesFileName)` Helper method that returns an immutable `Map` of properties defined in `propertiesFileName`.
`static boolean`	`isNullOrEmpty(CharSequence charSequence)` Checks if the character sequence is null or empty.
`static boolean`	`isNullOrEmpty(Collection<?> collection)` Checks if the collection is null or empty.
`static boolean`	`isNullOrEmpty(Map<?,?> map)` Checks if the map is null or empty.
`static boolean`	`isNullOrEmpty(Object[] array)` Checks if the array is null or empty.

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

- Method Detail
  - clone
```
public static byte[] clone(byte[] source)
```
    Creates a copy of the source byte array.
    
    Parameters:
    
    source - Array to make copy of
    
    Returns:
    
    A copy of the array, or null if source was null.
  - clone
```
public static int[] clone(int[] source)
```
    Creates a copy of the source int array.
    
    Parameters:
    
    source - Array to make copy of
    
    Returns:
    
    A copy of the array, or null if source was null.
  - clone
```
public static <T> T[] clone(T[] source)
```
    Creates a copy of the source array.
    
    Type Parameters:
    
    T - Generic representing the type of the source array.
    
    Parameters:
    
    source - Array being copied.
    
    Returns:
    
    A copy of the array or null if source was null.
  - isNullOrEmpty
```
public static boolean isNullOrEmpty(Object[] array)
```
    Checks if the array is null or empty.
    
    Parameters:
    
    array - Array being checked for nullness or emptiness.
    
    Returns:
    
    True if the array is null or empty, false otherwise.
  - isNullOrEmpty
```
public static boolean isNullOrEmpty(Collection<?> collection)
```
    Checks if the collection is null or empty.
    
    Parameters:
    
    collection - Collection being checked for nullness or emptiness.
    
    Returns:
    
    True if the collection is null or empty, false otherwise.
  - isNullOrEmpty
```
public static boolean isNullOrEmpty(Map<?,?> map)
```
    Checks if the map is null or empty.
    
    Parameters:
    
    map - Map being checked for nullness or emptiness.
    
    Returns:
    
    True if the map is null or empty, false otherwise.
  - isNullOrEmpty
```
public static boolean isNullOrEmpty(CharSequence charSequence)
```
    Checks if the character sequence is null or empty.
    
    Parameters:
    
    charSequence - Character sequence being checked for nullness or emptiness.
    
    Returns:
    
    True if the character sequence is null or empty, false otherwise.
  - arrayToString
```
public static <T> String arrayToString(T[] array,
                                       Function<T,String> mapper)
```
    Turns an array into a string mapping each element to a string and delimits them using a coma.
    
    Type Parameters:
    
    T - Generic representing the type of the array.
    
    Parameters:
    
    array - Array being formatted to a string.
    
    mapper - Function that maps each element to a string.
    
    Returns:
    
    Array with each element mapped and delimited, otherwise null if the array is empty or null.
  - findFirstOfType
```
public static <T> T findFirstOfType(Object[] args,
                                    Class<T> clazz)
```
    Returns the first instance of the given class from an array of Objects.
    
    Type Parameters:
    
    T - Generic type
    
    Parameters:
    
    args - Array of objects to search through to find the first instance of the given `clazz` type.
    
    clazz - The type trying to be found.
    
    Returns:
    
    The first object of the desired type, otherwise null.
  - extractAndFetch
```
public static <T> org.reactivestreams.Publisher<T> extractAndFetch(PagedResponse<T> page,
                                                                   Context context,
                                                                   BiFunction<String,Context,org.reactivestreams.Publisher<T>> content)
```
    Extracts and combines the generic items from all the pages linked together.
    
    Type Parameters:
    
    T - The type of the item being returned in the paged response.
    
    Parameters:
    
    page - The paged response from server holding generic items.
    
    context - Metadata that is passed into the function that fetches the items from the next page.
    
    content - The function which fetches items from the next page.
    
    Returns:
    
    The publisher holding all the generic items combined.
  - getProperties
```
public static Map<String,String> getProperties(String propertiesFileName)
```
    Helper method that returns an immutable Map of properties defined in propertiesFileName.
    
    Parameters:
    
    propertiesFileName - The file name defining the properties.
    
    Returns:
    
    an immutable Map.
  - bomAwareToString
```
public static String bomAwareToString(byte[] bytes,
                                      String contentType)
```
    Attempts to convert a byte stream into the properly encoded String.
    This utility method will attempt to find the encoding for the String in this order.
    1. Find the byte order mark in the byte array.
    2. Find the charset in the Content-Type header.
    3. Default to UTF-8.
    Parameters:
    
    bytes - Byte array.
    
    contentType - Content-Type header value.
    
    Returns:
    
    A string representation of the byte array encoded to the found encoding.
  - getApplicationId
```
public static String getApplicationId(ClientOptions clientOptions,
                                      HttpLogOptions logOptions)
```
    Retrieves the application ID from either a ClientOptions or HttpLogOptions.
    This method first checks clientOptions for having an application ID then logOptions, finally returning null if neither are set.
    clientOptions is checked first as logOptions application ID is deprecated.
    
    Parameters:
    
    clientOptions - The ClientOptions.
    
    logOptions - The HttpLogOptions.
    
    Returns:
    
    The application ID from either clientOptions or logOptions, if neither are set null.

Class CoreUtils

Method Summary

Methods inherited from class java.lang.Object

Method Detail

clone

clone

clone

isNullOrEmpty

isNullOrEmpty

isNullOrEmpty

isNullOrEmpty

arrayToString

findFirstOfType

extractAndFetch

getProperties

bomAwareToString

getApplicationId