oracle.javatools.util

Class ModelUtil

java.lang.Object

oracle.javatools.util.ModelUtil

Direct Known Subclasses:

ModelUtil

public class ModelUtil
extends java.lang.Object

Common utility methods.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ModelUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	areDifferent(java.lang.Object o1, java.lang.Object o2) This is a utility method that compares two objects when one or both of the objects might be null.
static boolean	areEqual(java.lang.Object o1, java.lang.Object o2) This is a utility method that compares two objects when one or both of the objects might be null The result of this method is determined as follows: If o1 and o2 are the same object according to the == operator, return true.
static <T> T	as(java.lang.Object o, java.lang.Class<T> clazz) Casts the object to the given class, if it is an instance, or returns null otherwise.
static java.lang.String	concat(java.lang.String[] strs) Returns a single string that is the concatenation of all the strings in the specified string array.
static java.lang.String	concat(java.lang.String[] strs, java.lang.String delim) Returns a single string that is the concatenation of all the strings in the specified string array.
static void	deepCopy(java.util.List src, java.util.List dst) Copies list contents from src to dst.
static void	deepCopy(java.util.List src, java.util.List dst, boolean eliminateDuplicates) Copies list contents from src to dst.
static void	deepCopy(java.util.Map src, java.util.Map dst) Copies key-value mappings from src to dst.
static int	hashCodeFor(java.lang.Object o) Returns the hash code for the specified object, or 0 if it is null.
static boolean	hasLength(java.lang.CharSequence cs) Returns true if the specified String is not null and has a length greater than zero.
static boolean	hasLength(java.lang.String s)
static boolean	hasNonNullElement(java.lang.Object[] array) Returns true if the specified array is not null and contains a non-null element.
static java.lang.String	nullifyIfEmpty(java.lang.String s) Returns null if the specified string is empty or null.

Methods inherited from class java.lang.Object

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

Constructor Detail

ModelUtil

protected ModelUtil()

Method Detail

areEqual

public static final boolean areEqual(java.lang.Object o1,
               java.lang.Object o2)

This is a utility method that compares two objects when one or both of the objects might be null The result of this method is determined as follows:

1. If o1 and o2 are the same object according to the == operator, return true.
2. Otherwise, if either o1 or o2 is null, return false.
3. Otherwise, return o1.equals(o2).

This method produces the exact logically inverted result as the areDifferent(Object, Object) method.

For array types, one of the equals methods in Arrays should be used instead of this method. Note that arrays with more than one dimension will require some custom code in order to implement equals properly.

areDifferent

public static final boolean areDifferent(java.lang.Object o1,
                   java.lang.Object o2)

This is a utility method that compares two objects when one or both of the objects might be null. The result returned by this method is determined as follows:

1. If o1 and o2 are the same object according to the == operator, return false.
2. Otherwise, if either o1 or o2 is null, return true.
3. Otherwise, return !o1.equals(o2).

This method produces the exact logically inverted result as the areEqual(Object, Object) method.

For array types, one of the equals methods in Arrays should be used instead of this method. Note that arrays with more than one dimension will require some custom code in order to implement equals properly.

hasNonNullElement

public static final boolean hasNonNullElement(java.lang.Object[] array)

Returns true if the specified array is not null and contains a non-null element. Returns false if the array is null or if all the array elements are null.

concat

public static final java.lang.String concat(java.lang.String[] strs)

Returns a single string that is the concatenation of all the strings in the specified string array. A single space is put between each string array element. Null array elements are skipped. If the array itself is null, the empty string is returned. This method is guaranteed to return a non-null value, if no expections are thrown.

concat

public static final java.lang.String concat(java.lang.String[] strs,
                      java.lang.String delim)

Returns a single string that is the concatenation of all the strings in the specified string array. The strings are separated by the specified delimiter. Null array elements are skipped. If the array itself is null, the empty string is returned. This method is guaranteed to return a non-null value, if no expections are thrown.

hasLength

public static final boolean hasLength(java.lang.String s)

See Also:

hasLength(CharSequence)

hashCodeFor

public static int hashCodeFor(java.lang.Object o)

Returns the hash code for the specified object, or 0 if it is null.

Parameters:

o - an object, which may be null.

Returns:

the object's hashCode() or 0.

hasLength

public static final boolean hasLength(java.lang.CharSequence cs)

Returns true if the specified String is not null and has a length greater than zero. This is a very frequently occurring check.

nullifyIfEmpty

public static final java.lang.String nullifyIfEmpty(java.lang.String s)

Returns null if the specified string is empty or null. Otherwise the string itself is returned.

deepCopy

public static final void deepCopy(java.util.Map src,
            java.util.Map dst)

Copies key-value mappings from src to dst. Any pre-existing mappings in dst are not deleted. However, any mappings in src that also exist in dst will result in the dst mappings being overwritten, if and only if the value objects have exactly the same type; otherwise, a new value object is created and the old value object is discarded. The key objects are not copied, so the keys that end up in dst will be references to the exact same objects as the keys in src. Values, however, are copied if the value objects implement Copyable. Value objects that do not implement Copyable are put directly into the dst Map.

deepCopy

public static final void deepCopy(java.util.List src,
            java.util.List dst,
            boolean eliminateDuplicates)

Copies list contents from src to dst. If the dst list is not empty it will add the elements from src. If eliminateDuplicates is true, src elements that already exist in dst are not copied.

deepCopy

public static final void deepCopy(java.util.List src,
            java.util.List dst)

Copies list contents from src to dst. If the dst list is not empty it will add the elements from src. If a src element already exists in dst, it isn't copied.

as

public static <T> T as(java.lang.Object o,
       java.lang.Class<T> clazz)

Casts the object to the given class, if it is an instance, or returns null otherwise.