Dmitry Jemerov
51 lines
2.2 KiB
Java
51 lines
2.2 KiB
Java
/*******************************************************************************
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* Copyright (c) 2011, 2013 Stephan Herrmann and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* Stephan Herrmann - initial API and implementation
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* IBM Corporation - bug fixes
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*******************************************************************************/
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package org.eclipse.jdt.annotation;
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import static java.lang.annotation.ElementType.FIELD;
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import static java.lang.annotation.ElementType.LOCAL_VARIABLE;
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import static java.lang.annotation.ElementType.METHOD;
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import static java.lang.annotation.ElementType.PARAMETER;
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import java.lang.annotation.Documented;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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/**
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* Qualifier for a type in a method signature or a local variable declaration:
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* The entity (return value, parameter, field, local variable) whose type has this
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* annotation can never have the value <code>null</code> at runtime.
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* <p>
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* This has two consequences:
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* <ol>
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* <li>Dereferencing the entity is safe, i.e., no <code>NullPointerException</code> can occur at runtime.</li>
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* <li>An attempt to bind a <code>null</code> value to the entity is a compile time error.</li>
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* </ol>
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* For the second case, diagnostics issued by the compiler should distinguish three situations:
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* <ol>
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* <li>Nullness of the value can be statically determined, the entity is definitely bound from either of:
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* <ul><li>the value <code>null</code>, or</li>
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* <li>an entity with a {@link Nullable @Nullable} type.</li></ul></li>
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* <li>Nullness cannot definitely be determined, because different code branches yield different results.</li>
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* <li>Nullness cannot be determined, because other program elements are involved for which
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* null annotations are lacking.</li>
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* </ol>
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* </p>
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* @since 1.0
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*/
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@Documented
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@Retention(RetentionPolicy.CLASS)
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@Target({ FIELD, METHOD, PARAMETER, LOCAL_VARIABLE })
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public @interface NonNull {
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// marker annotation with no members
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} |