X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=binding%2Fyang-binding%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fyangtools%2Fyang%2Fbinding%2FCodeHelpers.java;h=aba378e49ca11f9d737ea36715585828ee385894;hb=0e6a64805fc5dfcba9858917c08ed552ccf2b303;hp=6a2486962effdbe5b629f944161db61e52a12038;hpb=1382c1d88b753e152ff26eae1091cd42e5aba76b;p=mdsal.git diff --git a/binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/CodeHelpers.java b/binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/CodeHelpers.java index 6a2486962e..aba378e49c 100644 --- a/binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/CodeHelpers.java +++ b/binding/yang-binding/src/main/java/org/opendaylight/yangtools/yang/binding/CodeHelpers.java @@ -14,9 +14,15 @@ import static java.util.Objects.requireNonNull; import com.google.common.base.MoreObjects.ToStringHelper; import com.google.common.base.VerifyException; import com.google.common.collect.ImmutableList; +import com.google.common.collect.ImmutableMap; +import edu.umd.cs.findbugs.annotations.SuppressFBWarnings; import java.util.Arrays; +import java.util.Collection; import java.util.List; +import java.util.Map; +import java.util.NoSuchElementException; import java.util.Objects; +import java.util.Set; import java.util.regex.Pattern; import org.eclipse.jdt.annotation.NonNull; import org.eclipse.jdt.annotation.Nullable; @@ -46,24 +52,33 @@ public final class CodeHelpers { } /** - * Require an argument being received. This is similar to {@link java.util.Objects#requireNonNull(Object)}, but - * throws an IllegalArgumentException. + * Return value and check whether specified value is null and if so throws exception. This method supports + * require default getter methods. * - *

- * Implementation note: we expect argName to be a string literal or a constant, so that it's non-nullness can be - * quickly discovered for a call site (where we are going to be inlined). + * @param value Value itself + * @param name Name of the value + * @return Non-null value + * @throws NoSuchElementException if value is null + */ + public static @NonNull T require(final @Nullable T value, final @NonNull String name) { + if (value == null) { + throw new NoSuchElementException("Value of " + name + " is not present"); + } + return value; + } + + /** + * A shortcut for {@code Preconditions.checkNotNull(value, "Key component \"%s\" must not be null", name)}. * * @param value Value itself - * @param name Symbolic name - * @return non-null value - * @throws IllegalArgumentException if value is null - * @throws NullPointerException if name is null + * @param name Name of the value + * @return Non-null value + * @throws NullPointerException if value is null */ - // FIXME: another advantage is that it is JDT-annotated, but we could live without that. At some point we should - // schedule a big ISE-to-NPE conversion and just use Objects.requireNonNull() instead. - public static @NonNull T nonNullValue(@Nullable final T value, final @NonNull String name) { - requireNonNull(name); - checkArgument(value != null, "%s must not be null", name); + public static @NonNull T requireKeyProp(final @Nullable T value, final @NonNull String name) { + if (value == null) { + throw new NullPointerException("Key component \"" + name + "\" may not be null"); + } return value; } @@ -73,7 +88,7 @@ public final class CodeHelpers { * @param value Value itself * @throws NullPointerException if value is null */ - public static void requireValue(@Nullable final Object value) { + public static void requireValue(final @Nullable Object value) { requireNonNull(value, "Supplied value may not be null"); } @@ -102,10 +117,28 @@ public final class CodeHelpers { */ public static void appendValue(final ToStringHelper helper, final String name, final byte[] value) { if (value != null) { + // FIXME: MDSAL-692: use hex-encoding instead helper.add(name, Arrays.toString(value)); } } + /** + * Append augmentation map of an Augmentable to a ToStringHelper. If augmentations are null or empt, this method + * does nothing. + * + * @param helper Helper to append to + * @param name Name of the augmentation value + * @param augmentable Augmentable object to + * @throws NullPointerException if any argument is null + */ + public static void appendAugmentations(final ToStringHelper helper, final String name, + final Augmentable augmentable) { + final var augments = augmentable.augmentations(); + if (!augments.isEmpty()) { + helper.add(name, augments.values()); + } + } + /** * Compile a list of pattern regular expressions and return them as an array. The list must hold at least two * expressions. @@ -181,6 +214,7 @@ public final class CodeHelpers { * @throws IllegalArgumentException always */ public static void throwInvalidLength(final String expected, final byte[] actual) { + // FIXME: MDSAL-692: use hex-encoding instead throwInvalidLength(expected, Arrays.toString(actual)); } @@ -246,6 +280,7 @@ public final class CodeHelpers { * Check whether specified List is null and if so return an immutable list instead. This method supports * non-null default getter methods. * + * @param list element type * @param input input list, may be null * @return Input list or an empty list. */ @@ -253,6 +288,44 @@ public final class CodeHelpers { return input != null ? input : ImmutableList.of(); } + /** + * Check whether specified Map is null and if so return an immutable map instead. This method supports + * non-null default getter methods. + * + * @param key type + * @param value type + * @param input input map, may be null + * @return Input map or an empty map. + */ + public static @NonNull Map nonnull(final @Nullable Map input) { + return input != null ? input : ImmutableMap.of(); + } + + /** + * Check whether specified List is empty and if so return null, otherwise return input list. This method supports + * Builder/implementation list handover. + * + * @param list element type + * @param input input list, may be null + * @return Input list or null. + */ + public static @Nullable List emptyToNull(final @Nullable List input) { + return input != null && input.isEmpty() ? null : input; + } + + /** + * Check whether specified Map is empty and if so return null, otherwise return input map. This method supports + * Builder/implementation list handover. + * + * @param key type + * @param value type + * @param input input map, may be null + * @return Input map or null. + */ + public static @Nullable Map emptyToNull(final @Nullable Map input) { + return input != null && input.isEmpty() ? null : input; + } + /** * Return hash code of a single-property wrapper class. Since the wrapper is not null, we really want to discern * this object being present, hence {@link Objects#hashCode()} is not really useful we would end up with {@code 0} @@ -277,13 +350,96 @@ public final class CodeHelpers { return wrapHashCode(Arrays.hashCode(obj)); } + /** + * Utility method for checking whether a target object is a compatible DataObject. + * + * @param requiredClass Required DataObject class + * @param obj Object to check, may be null + * @return Object cast to required class, if its implemented class matches requirement, null otherwise + * @throws NullPointerException if {@code requiredClass} is null + */ + public static @Nullable T checkCast(final @NonNull Class requiredClass, + final @Nullable Object obj) { + return obj instanceof DataObject && requiredClass.equals(((DataObject) obj).implementedInterface()) + ? requiredClass.cast(obj) : null; + } + + /** + * Utility method for checking whether a target object is compatible. + * + * @param requiredClass Required class + * @param fieldName name of the field being filled + * @param obj Object to check, may be null + * @return Object cast to required class, if its class matches requirement, or null + * @throws IllegalArgumentException if {@code obj} is not an instance of {@code requiredClass} + * @throws NullPointerException if {@code requiredClass} or {@code fieldName} is null + */ + public static @Nullable T checkFieldCast(final @NonNull Class requiredClass, final @NonNull String fieldName, + final @Nullable Object obj) { + try { + return requiredClass.cast(obj); + } catch (ClassCastException e) { + throw new IllegalArgumentException("Invalid input value for property \"" + fieldName + "\"", e); + } + } + + /** + * Utility method for checking whether the items of target list is compatible. + * + * @param requiredClass Required item class + * @param fieldName name of the field being filled + * @param list List, which items should be checked + * @return Type-checked List + * @throws IllegalArgumentException if a list item is not instance of {@code requiredClass} + * @throws NullPointerException if {@code requiredClass} or {@code fieldName} is null + */ + @SuppressWarnings("unchecked") + public static @Nullable List checkListFieldCast(final @NonNull Class requiredClass, + final @NonNull String fieldName, final @Nullable List list) { + checkCollectionField(requiredClass, fieldName, list); + return (List) list; + } + + /** + * Utility method for checking whether the items of target list is compatible. + * + * @param requiredClass Required item class + * @param fieldName name of the field being filled + * @param set Set, which items should be checked + * @return Type-checked Set + * @throws IllegalArgumentException if a set item is not instance of {@code requiredItemClass} + * @throws NullPointerException if {@code requiredClass} or {@code fieldName} is null + */ + @SuppressWarnings("unchecked") + public static @Nullable Set checkSetFieldCast(final @NonNull Class requiredClass, + final @NonNull String fieldName, final @Nullable Set set) { + checkCollectionField(requiredClass, fieldName, set); + return (Set) set; + } + + @SuppressFBWarnings(value = "DCN_NULLPOINTER_EXCEPTION", + justification = "Internal NPE->IAE conversion") + private static void checkCollectionField(final @NonNull Class requiredClass, + final @NonNull String fieldName, final @Nullable Collection collection) { + if (collection != null) { + try { + collection.forEach(item -> requiredClass.cast(requireNonNull(item))); + } catch (ClassCastException | NullPointerException e) { + throw new IllegalArgumentException("Invalid input item for property \"" + requireNonNull(fieldName) + + "\"", e); + } + } + } + /** * The constant '31' is the result of folding this code: * 

+     *   
      *     final int prime = 31;
      *     int result = 1;
      *     result = result * prime + Objects.hashCode(obj);
      *     return result;
+     *   
      *
* when hashCode is returned as 0, such as due to obj being null or its hashCode being 0. *