68 lines
2.4 KiB
Java
68 lines
2.4 KiB
Java
package it.tdlight.tdlib;
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public class ObjectsUtils {
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/**
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* Returns the first argument if it is non-{@code null} and
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* otherwise returns the non-{@code null} second argument.
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*
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* @param obj an object
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* @param defaultObj a non-{@code null} object to return if the first argument
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* is {@code null}
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* @param <T> the type of the reference
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* @return the first argument if it is non-{@code null} and
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* otherwise the second argument if it is non-{@code null}
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* @throws NullPointerException if both {@code obj} is null and
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* {@code defaultObj} is {@code null}
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* @since 9
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*/
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public static <T> T requireNonNullElse(T obj, T defaultObj) {
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return (obj != null) ? obj : requireNonNull(defaultObj, "defaultObj");
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}
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/**
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* Checks that the specified object reference is not {@code null}. This
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* method is designed primarily for doing parameter validation in methods
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* and constructors, as demonstrated below:
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* <blockquote><pre>
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* public Foo(Bar bar) {
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* this.bar = Objects.requireNonNull(bar);
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* }
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* </pre></blockquote>
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*
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* @param obj the object reference to check for nullity
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* @param <T> the type of the reference
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* @return {@code obj} if not {@code null}
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* @throws NullPointerException if {@code obj} is {@code null}
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*/
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public static <T> T requireNonNull(T obj) {
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if (obj == null)
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throw new NullPointerException();
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return obj;
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}
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/**
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* Checks that the specified object reference is not {@code null} and
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* throws a customized {@link NullPointerException} if it is. This method
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* is designed primarily for doing parameter validation in methods and
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* constructors with multiple parameters, as demonstrated below:
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* <blockquote><pre>
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* public Foo(Bar bar, Baz baz) {
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* this.bar = Objects.requireNonNull(bar, "bar must not be null");
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* this.baz = Objects.requireNonNull(baz, "baz must not be null");
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* }
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* </pre></blockquote>
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*
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* @param obj the object reference to check for nullity
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* @param message detail message to be used in the event that a {@code
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* NullPointerException} is thrown
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* @param <T> the type of the reference
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* @return {@code obj} if not {@code null}
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* @throws NullPointerException if {@code obj} is {@code null}
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*/
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public static <T> T requireNonNull(T obj, String message) {
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if (obj == null)
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throw new NullPointerException(message);
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return obj;
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}
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}
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