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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.SOURCE;
/**
* Denotes that the annotated method returns a result that it typically is
* an error to ignore. This is usually used for methods that have no side effect,
* so calling it without actually looking at the result usually means the developer
* has misunderstood what the method does.
* <p>
* Example:
* <pre>{@code
* public @CheckResult String trim(String s) { return s.trim(); }
* ...
* s.trim(); // this is probably an error
* s = s.trim(); // ok
* }</pre>
*
* @hide
*/
@Retention(SOURCE)
@Target({METHOD})
public @interface CheckResult {
/** Defines the name of the suggested method to use instead, if applicable (using
* the same signature format as javadoc.) If there is more than one possibility,
* list them all separated by commas.
* <p>
* For example, ProcessBuilder has a method named {@code redirectErrorStream()}
* which sounds like it might redirect the error stream. It does not. It's just
* a getter which returns whether the process builder will redirect the error stream,
* and to actually set it, you must call {@code redirectErrorStream(boolean)}.
* In that case, the method should be defined like this:
* <pre>
* @CheckResult(suggest="#redirectErrorStream(boolean)")
* public boolean redirectErrorStream() { ... }
* </pre>
*/
String suggest() default "";
}
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