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ObjectUtils: contracts

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This commit is contained in:
Tagir Valeev
2018-01-23 17:59:37 +07:00
parent 38950341f7
commit f55b92e920
1 changed files with 6 additions and 4 deletions
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platform/util/src/com/intellij/util/ObjectUtils.java
+6 -4
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@@ -45,17 +45,17 @@ public class ObjectUtils {
}
}
@Contract("null, null -> null")
@Contract(value = "!null, _ -> !null; _, !null -> !null; _, _ -> null", pure = true)
public static <T> T chooseNotNull(@Nullable T t1, @Nullable T t2) {
return t1 == null? t2 : t1;
}
@Contract("null,null->null")
@Contract(value = "!null, _ -> !null; _, !null -> !null; _, _ -> null", pure = true)
public static <T> T coalesce(@Nullable T t1, @Nullable T t2) {
return chooseNotNull(t1, t2);
}
@Contract("null,null,null->null")
@Contract(value = "!null, _, _ -> !null; _, !null, _ -> !null; _, _, !null -> !null; _,_,_ -> null", pure = true)
public static <T> T coalesce(@Nullable T t1, @Nullable T t2, @Nullable T t3) {
return t1 != null ? t1 : t2 != null ? t2 : t3;
}
@@ -76,6 +76,7 @@ public class ObjectUtils {
}
@NotNull
@Contract(pure = true)
public static <T> T notNull(@Nullable T value, @NotNull T defaultValue) {
return value == null ? defaultValue : value;
}
@@ -85,7 +86,7 @@ public class ObjectUtils {
return value == null ? defaultValue.create() : value;
}
@Contract("null, _ -> null")
@Contract(value = "null, _ -> null", pure = true)
@Nullable
public static <T> T tryCast(@Nullable Object obj, @NotNull Class<T> clazz) {
if (clazz.isInstance(obj)) {
@@ -109,6 +110,7 @@ public class ObjectUtils {
}
@Nullable
@Contract("null, _ -> null")
public static <T> T nullizeByCondition(@Nullable final T obj, @NotNull final Condition<T> condition) {
if (condition.value(obj)) {
return null;