Util (JavaLite - Java, light as a feather 2.7-j8-SNAPSHOT API)

java.lang.Object
- org.javalite.common.Util

```
public final class Util
extends Object
```
Author:

Igor Polevoy, Eric Nielsen

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`String[]`	`arr(String... params)` Convenience method to create literal String arrays.
`static boolean`	`blank(Object value)` Returns true if value is either null or it's String representation is blank.
`static byte[]`	`bytes(InputStream in)` Reads contents of the input stream fully and returns it as byte array.
`static void`	`closeQuietly(AutoCloseable... autoCloseable)` Close multiple resources.
`static void`	`closeQuietly(AutoCloseable autoCloseable)` Closes a resource and swallows exception if thrown during a close.
`static <T extends AutoCloseable> void`	`closeQuietly(List<T> autoCloseable)` Close multiple resources.
`static boolean`	`createTree(Path path)` Creates directories recursively.
`static boolean`	`empty(Collection<?> collection)` Returns true if collection is either null or empty.
`static boolean`	`empty(Object[] array)` Returns true if array is either null or empty.
`static byte[]`	`fromBase64(String input)` Will decode Base64-encoded string back into byte array.
`static String`	`getCauseMessage(Throwable throwable)` This is stolen...ehrr...
`static Field`	`getField(String fieldName, Class clazz)` Gets a field from a class.
`static List<String>`	`getResourceLines(String resourceName)` Returns lines of text of a resource as list.
`static String`	`getStackTraceString(Throwable throwable)` Converts stack trace to string.
`static String`	`join(Collection<?> collection, String delimiter)` Joins the items in collection with a delimiter.
`static String`	`join(String[] array, String delimiter)` Joins the items in array with a delimiter.
`static void`	`join(StringBuilder sb, Collection<?> collection, String delimiter)` Joins the items in collection with a delimiter, and appends the result to StringBuilder.
`static void`	`join(StringBuilder sb, Object[] array, String delimiter)` Joins the items in array with a delimiter, and appends the result to StringBuilder.
`static void`	`joinAndRepeat(StringBuilder sb, String str, String delimiter, int count)` Repeats string of characters a defined number of times with a delimiter, and appends result to StringBuilder.
`static byte[]`	`read(File file)` Reads file into a byte array.
`static String`	`read(InputStream in)` Reads contents of the input stream fully and returns it as String.
`static String`	`read(InputStream in, String charset)` Reads contents of the input stream fully and returns it as String.
`static String`	`readFile(String fileName)` Reads contents of file fully and returns as string.
`static String`	`readFile(String fileName, String charset)` Reads contents of file fully and returns as string.
`static Properties`	`readProperties(String fileOrResource)` Reads a property file from classpath or from a file system to a properties object.
`static String`	`readResource(String resourceName)` Reads contents of resource fully into a string.
`static String`	`readResource(String resourceName, String charset)` Reads contents of resource fully into a string.
`static byte[]`	`readResourceBytes(String resourceName)` Reads contents of resource fully into a byte array.
`static void`	`recursiveDelete(Path directory)` Deletes a directory recursively with all its contents.
`static void`	`repeat(StringBuilder sb, String str, int count)` Repeats string of characters a defined number of times, and appends result to StringBuilder.
`static void`	`saveTo(String path, byte[] content)` Saves content of byte array to file.
`static void`	`saveTo(String path, InputStream in)` Saves content read from input stream into a file.
`static String[]`	`split(String input, char delimiter)` Splits a string into an array using provided delimiter.
`static String[]`	`split(String input, String delimiters)` Splits a string into an array using provided delimiters.
`static String`	`toBase64(byte[] input)` Will encode byte array using Base64 encoding.

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

- Method Detail
  - readResourceBytes
```
public static byte[] readResourceBytes(String resourceName)
```
    Reads contents of resource fully into a byte array.
    
    Parameters:
    
    resourceName - resource name.
    
    Returns:
    
    entire contents of resource as byte array.
  - readResource
```
public static String readResource(String resourceName)
```
    Reads contents of resource fully into a string. Sets UTF-8 encoding internally.
    
    Parameters:
    
    resourceName - resource name.
    
    Returns:
    
    entire contents of resource as string.
  - readResource
```
public static String readResource(String resourceName,
                                  String charset)
```
    Reads contents of resource fully into a string.
    
    Parameters:
    
    resourceName - resource name.
    
    charset - name of supported charset
    
    Returns:
    
    entire contents of resource as string.
  - readFile
```
public static String readFile(String fileName)
```
    Reads contents of file fully and returns as string.
    
    Parameters:
    
    fileName - file name.
    
    Returns:
    
    contents of entire file.
  - readFile
```
public static String readFile(String fileName,
                              String charset)
```
    Reads contents of file fully and returns as string.
    
    Parameters:
    
    fileName - file name.
    
    charset - name of supported charset.
    
    Returns:
    
    contents of entire file.
  - closeQuietly
```
public static void closeQuietly(AutoCloseable autoCloseable)
```
    Closes a resource and swallows exception if thrown during a close.
    
    Parameters:
    
    autoCloseable - resource to close
  - closeQuietly
```
public static void closeQuietly(AutoCloseable... autoCloseable)
```
    Close multiple resources. Calls closeQuietly(AutoCloseable) under the hood.
    
    Parameters:
    
    autoCloseable - array of instances of java.lang.AutoCloseable.
  - closeQuietly
```
public static <T extends AutoCloseable> void closeQuietly(List<T> autoCloseable)
```
    Close multiple resources. Calls closeQuietly(AutoCloseable) under the hood.
    
    Parameters:
    
    autoCloseable - array of instances of java.lang.AutoCloseable.
  - read
```
public static String read(InputStream in)
                   throws IOException
```
    Reads contents of the input stream fully and returns it as String. Sets UTF-8 encoding internally.
    
    Parameters:
    
    in - InputStream to read from.
    
    Returns:
    
    contents of the input stream fully as String.
    
    Throws:
    
    IOException - in case of IO error
  - read
```
public static String read(InputStream in,
                          String charset)
                   throws IOException
```
    Reads contents of the input stream fully and returns it as String.
    
    Parameters:
    
    in - InputStream to read from.
    
    charset - name of supported charset to use
    
    Returns:
    
    contents of the input stream fully as String.
    
    Throws:
    
    IOException - in case of IO error
  - bytes
```
public static byte[] bytes(InputStream in)
                    throws IOException
```
    Reads contents of the input stream fully and returns it as byte array.
    
    Parameters:
    
    in - InputStream to read from.
    
    Returns:
    
    contents of the input stream fully as byte array
    
    Throws:
    
    IOException - in case of IO error
  - read
```
public static byte[] read(File file)
                   throws IOException
```
    Reads file into a byte array.
    
    Parameters:
    
    file - file to read.
    
    Returns:
    
    content of file.
    
    Throws:
    
    IOException
  - getResourceLines
```
public static List<String> getResourceLines(String resourceName)
                                     throws IOException
```
    Returns lines of text of a resource as list.
    
    Parameters:
    
    resourceName - name of resource
    
    Returns:
    
    list of text lines
    
    Throws:
    
    IOException - in case of IO error
  - blank
```
public static boolean blank(Object value)
```
    Returns true if value is either null or it's String representation is blank.
    
    Parameters:
    
    value - object to check.
    
    Returns:
    
    true if value is either null or it's String representation is blank, otherwise returns false.
  - empty
```
public static boolean empty(Object[] array)
```
    Returns true if array is either null or empty.
    
    Parameters:
    
    array - array to check
    
    Returns:
    
    true if array is either null or empty, false otherwise
  - empty
```
public static boolean empty(Collection<?> collection)
```
    Returns true if collection is either null or empty.
    
    Parameters:
    
    collection - collection to check
    
    Returns:
    
    true if collection is either null or empty, false otherwise
  - join
```
public static String join(String[] array,
                          String delimiter)
```
    Joins the items in array with a delimiter.
    
    Parameters:
    
    array - array of items to join.
    
    delimiter - delimiter to insert between elements of array.
    
    Returns:
    
    string with array elements separated by delimiter. There is no trailing delimiter in the string.
  - split
```
public static String[] split(String input,
                             String delimiters)
```
    Splits a string into an array using provided delimiters. Empty (but not blank) split chunks are omitted. The split chunks are trimmed.
    
    Parameters:
    
    input - string to split.
    
    delimiters - delimiters
    
    Returns:
    
    a string split into an array using provided delimiters
  - split
```
public static String[] split(String input,
                             char delimiter)
```
    Splits a string into an array using provided delimiter. Empty (but not blank) split chunks are omitted. The split chunks are trimmed.
    
    Parameters:
    
    input - string to split.
    
    delimiter - delimiter
    
    Returns:
    
    a string split into an array using a provided delimiter
  - join
```
public static String join(Collection<?> collection,
                          String delimiter)
```
    Joins the items in collection with a delimiter.
    
    Parameters:
    
    collection - collection of items to join.
    
    delimiter - delimiter to insert between elements of collection.
    
    Returns:
    
    string with collection elements separated by delimiter. There is no trailing delimiter in the string.
  - join
```
public static void join(StringBuilder sb,
                        Collection<?> collection,
                        String delimiter)
```
    Joins the items in collection with a delimiter, and appends the result to StringBuilder.
    
    Parameters:
    
    sb - StringBuilder to append result to
    
    collection - collection of items to join.
    
    delimiter - delimiter to insert between elements of collection.
  - join
```
public static void join(StringBuilder sb,
                        Object[] array,
                        String delimiter)
```
    Joins the items in array with a delimiter, and appends the result to StringBuilder.
    
    Parameters:
    
    sb - StringBuilder to append result to
    
    array - array of items to join.
    
    delimiter - delimiter to insert between elements of array.
  - repeat
```
public static void repeat(StringBuilder sb,
                          String str,
                          int count)
```
    Repeats string of characters a defined number of times, and appends result to StringBuilder.
    
    Parameters:
    
    sb - StringBuilder to append result to
    
    str - string of characters to be repeated.
    
    count - number of times to repeat, zero or a negative number produces no result
  - joinAndRepeat
```
public static void joinAndRepeat(StringBuilder sb,
                                 String str,
                                 String delimiter,
                                 int count)
```
    Repeats string of characters a defined number of times with a delimiter, and appends result to StringBuilder.
    For example, joinAndRepeat(sb, "?", ",", 3) will append "?,?,?" to sb.
    
    Parameters:
    
    sb - StringBuilder to append result to
    
    str - string of characters to be repeated.
    
    delimiter - delimiter to insert between repeated items.
    
    count - number of times to repeat, zero or a negative number produces no result
  - saveTo
```
public static void saveTo(String path,
                          InputStream in)
```
    Saves content read from input stream into a file.
    
    Parameters:
    
    path - path to file.
    
    in - input stream to read content from.
  - getCauseMessage
```
public static String getCauseMessage(Throwable throwable)
```
    This is stolen...ehrr... borrowed from Apache ExceptionUtils
    
    Parameters:
    
    throwable -
    
    Returns:
  - getStackTraceString
```
public static String getStackTraceString(Throwable throwable)
```
    Converts stack trace to string.
    
    Parameters:
    
    throwable - - throwable to convert.
    
    Returns:
    
    message and stack trace converted to string.
  - saveTo
```
public static void saveTo(String path,
                          byte[] content)
```
    Saves content of byte array to file.
    
    Parameters:
    
    path - path to file - can be absolute or relative to current.
    
    content - bytes to save.
  - toBase64
```
public static String toBase64(byte[] input)
```
    Will encode byte array using Base64 encoding.
    
    Parameters:
    
    input - bytes to encode
    
    Returns:
    
    encoded string
  - fromBase64
```
public static byte[] fromBase64(String input)
```
    Will decode Base64-encoded string back into byte array.
    
    Parameters:
    
    input - Base64-encoded string.
    
    Returns:
    
    byte array decoded from string.
  - arr
```
public String[] arr(String... params)
```
    Convenience method to create literal String arrays. Helps to replace code like this:
    String[] t = new String[]{"one", "two"}
    with:
    String[] t = arr("one", "two");
    
    Parameters:
    
    params - strings to create array
    
    Returns:
    
    array of strings
  - readProperties
```
public static Properties readProperties(String fileOrResource)
                                 throws IOException
```
    Reads a property file from classpath or from a file system to a properties object. The path can look like: /opt/database.properties. If this is found on classpath, it is loaded first. If not found on classpath, it will look for the file on te file system using the same path.
    
    Parameters:
    
    fileOrResource - full path to a property file on classpath or a path to a file on file system. Classpath is searched first.
    
    Returns:
    
    java.util.Properties object initialized from the file.
    
    Throws:
    
    IOException
  - createTree
```
public static boolean createTree(Path path)
```
    Creates directories recursively. If a directory already exists, it will be silently ignored.
    
    Returns:
    
    true if created all dirs, false if did not.
  - recursiveDelete
```
public static void recursiveDelete(Path directory)
                            throws IOException
```
    Deletes a directory recursively with all its contents. Will ignore files and directories if they disappear during the operation.
    
    Parameters:
    
    directory - directory to delete.
    
    Throws:
    
    IOException
  - getField
```
public static Field getField(String fieldName,
                             Class clazz)
```
    Gets a field from a class. Will traverse to super classes for it.
    
    Parameters:
    
    fieldName - name of a field to search
    
    clazz - - class to interrogate
    
    Returns:
    
    fild if found, null if not.

Class Util

Method Summary

Methods inherited from class java.lang.Object

Method Detail

readResourceBytes

readResource

readResource

readFile

readFile

closeQuietly

closeQuietly

closeQuietly

read

read

bytes

read

getResourceLines

blank

empty

empty

join

split

split

join

join

join

repeat

joinAndRepeat

saveTo

getCauseMessage

getStackTraceString

saveTo

toBase64

fromBase64

arr

readProperties

createTree

recursiveDelete

getField