Class Util

java.lang.Object
org.apache.cayenne.util.Util

public class Util
extends Object
Contains various unorganized static utility methods used across Cayenne.
  • Constructor Details

    • Util

      public Util()
  • Method Details

    • toFile

      public static File toFile​(URL url) throws IllegalArgumentException
      Converts URL to file. Throws IllegalArgumentException if the URL is not a "file://" URL.
      Throws:
      IllegalArgumentException
    • stringFromFile

      public static String stringFromFile​(File file) throws IOException
      Reads file contents, returning it as a String, using System default line separator.
      Throws:
      IOException
    • stringFromFile

      public static String stringFromFile​(File file, String joinWith) throws IOException
      Reads file contents, returning it as a String, joining lines with provided separator.
      Throws:
      IOException
    • join

      public static String join​(Iterable<?> objects, String separator)
      Parameters:
      objects - An Iterable of objects that will be converted to Strings and joined together.
      separator - The separator between the strings.
      Returns:
      A single string of all the input strings separated by the separator.
    • substBackslashes

      public static String substBackslashes​(String string)
      Replaces all backslashes "\" with forward slashes "/". Convenience method to convert path Strings to URI format.
    • unwindException

      public static Throwable unwindException​(Throwable th)
      Looks up and returns the root cause of an exception. If none is found, returns supplied Throwable object unchanged. If root is found, recursively "unwraps" it, and returns the result to the user.
    • nullSafeEquals

      public static boolean nullSafeEquals​(Object o1, Object o2)
      Compares two objects similar to "Object.equals(Object)". Unlike Object.equals(..), this method doesn't throw an exception if any of the two objects is null.
    • nullSafeCompare

      public static <T> int nullSafeCompare​(boolean nullsFirst, Comparable<T> o1, T o2)
      Compares two objects similar to "Comparable.compareTo(Object)". Unlike Comparable.compareTo(..), this method doesn't throw an exception if any of the two objects is null.
      Since:
      1.1
    • isEmptyString

      public static boolean isEmptyString​(CharSequence string)
      Returns true, if the String is null or an empty string.
    • isBlank

      public static boolean isBlank​(CharSequence cs)
      Returns true, if string not empty and contains non-whitespace characters.
      Since:
      4.1
    • isNumeric

      public static boolean isNumeric​(CharSequence cs)
      Since:
      4.1
    • countMatches

      public static int countMatches​(String str, String sub)
      Returns how many times the sub appears in the str.
      Since:
      4.1
    • capitalized

      public static String capitalized​(String name)
      Capitalizes the first letter of the property name.
      Since:
      4.1
    • uncapitalized

      public static String uncapitalized​(String aString)
      Returns string with lowercased first letter
      Since:
      4.2
    • cloneViaSerialization

      public static <T extends Serializable> T cloneViaSerialization​(T object) throws Exception
      Creates Serializable object copy using serialization/deserialization.
      Throws:
      Exception
    • createXmlReader

      public static XMLReader createXmlReader() throws SAXException, ParserConfigurationException
      Creates an XMLReader with default feature set. Note that all Cayenne internal XML parsers should probably use XMLReader obtained via this method for consistency sake, and can customize feature sets as needed.
      Throws:
      SAXException
      ParserConfigurationException
    • readDocument

      public static Document readDocument​(URL url)
      Parameters:
      url - to read
      Returns:
      org.w3c.dom.Document from the given URL
      Since:
      4.1
    • getPackagePath

      public static String getPackagePath​(String className)
      Returns package name for the Java class as a path separated with forward slash ("/"). Method is used to lookup resources that are located in package subdirectories. For example, a String "a/b/c" will be returned for class name "a.b.c.ClassName".
    • stripPackageName

      public static String stripPackageName​(String className)
      Returns an unqualified class name for the fully qualified name.
      Since:
      3.0
    • toMap

      public static <K,​ V> Map<K,​V> toMap​(K[] keys, V[] values)
      Creates a mutable map out of two arrays with keys and values.
      Since:
      1.2
    • extractFileExtension

      public static String extractFileExtension​(String fileName)
      Extracts extension from the file name. Dot is not included in the returned string.
    • stripFileExtension

      public static String stripFileExtension​(String fileName)
      Strips extension from the file name.
    • stripLineBreaks

      public static String stripLineBreaks​(String string, char replaceWith)
      Strips "\n", "\r\n", "\r" from the argument string, replacing them with a provided character.
      Since:
      3.1
    • encodeXmlAttribute

      public static String encodeXmlAttribute​(String string)
      Encodes a string so that it can be used as an attribute value in an XML document. Will do conversion of the greater/less signs, quotes and ampersands.
    • prettyTrim

      public static String prettyTrim​(String str, int maxLength)
      Trims long strings substituting middle part with "...".
      Parameters:
      str - String to trim.
      maxLength - maximum allowable length. Must be at least 5, or an IllegalArgumentException is thrown.
      Returns:
      String
    • sortedIterator

      public static <T> Iterator<T> sortedIterator​(Iterator<T> it, Comparator<T> comparator)
      Returns a sorted iterator from an unsorted one. Use this method as a last resort, since it is much less efficient then just sorting a collection that backs the original iterator.
    • hashCode

      public static int hashCode​(Collection<?> c)
      Builds a hashCode of Collection.
    • sqlPatternToPattern

      public static Pattern sqlPatternToPattern​(String pattern, boolean ignoreCase)
      Since:
      1.2
    • isAccessible

      public static boolean isAccessible​(Member member)
      Returns true if a Member is accessible via reflection under normal Java access controls.
      Since:
      1.2
    • getJavaClass

      @Deprecated public static Class<?> getJavaClass​(String className) throws ClassNotFoundException
      Deprecated.
      since 4.0 this method based on statically defined class loading algorithm is not going to work in environments like OSGi. AdhocObjectFactory should be used as it can provide the environment-specific class loading policy.
      Creates a Java class, handling regular class names as well as single-dimensional arrays and primitive types.
      Throws:
      ClassNotFoundException
      Since:
      1.2
    • underscoredToJava

      public static String underscoredToJava​(String name, boolean capitalize)
      Converts names like "ABCD_EFG_123" to Java-style names like "abcdEfg123". If capitalize is true, returned name is capitalized (for instance if this is a class name).
      Since:
      4.0
    • specialCharsToJava

      public static String specialCharsToJava​(String string)
      Replaces special chars with human-readable and Java-id-compatible symbols.
      Since:
      4.0