import com.google.common.base.MoreObjects.ToStringHelper;
import com.google.common.base.VerifyException;
+import com.google.common.collect.ImmutableList;
import java.util.Arrays;
import java.util.List;
+import java.util.Objects;
import java.util.regex.Pattern;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
return value;
}
+ /**
+ * A shortcut for {@code Objects.requireNonNull(value, "Supplied value may not be null")}.
+ *
+ * @param value Value itself
+ * @throws NullPointerException if value is null
+ */
+ public static void requireValue(@Nullable final Object value) {
+ requireNonNull(value, "Supplied value may not be null");
+ }
+
/**
* Append a named value to a ToStringHelper. If the value is null, this method does nothing.
*
* @param value Value to append
* @throws NullPointerException if the name or helper is null
*/
- public static void appendValue(final @NonNull ToStringHelper helper, final @NonNull String name,
+ public static void appendValue(final ToStringHelper helper, final @NonNull String name,
final @Nullable Object value) {
if (value != null) {
helper.add(name, value);
* @throws NullPointerException if the list or any of its elements is null
* @throws VerifyException if the list has fewer than two elements
*/
- public static @NonNull Pattern[] compilePatterns(final @NonNull List<String> patterns) {
+ public static Pattern @NonNull[] compilePatterns(final @NonNull List<String> patterns) {
final int size = patterns.size();
verify(size > 1, "Patterns has to have at least 2 elements");
- final @NonNull Pattern[] result = new Pattern[size];
+ final Pattern[] result = new Pattern[size];
for (int i = 0; i < size; ++i) {
result[i] = Pattern.compile(patterns.get(i));
}
throw new IllegalArgumentException("Invalid range: " + actual + ", expected: " + expected + ".");
}
+ /**
+ * Throw an IllegalArgument exception describing a range violation.
+ *
+ * @param expected String describing expected ranges
+ * @param actual Actual observed value
+ * @throws IllegalArgumentException always
+ */
+ public static void throwInvalidRange(final String expected, final int actual) {
+ // Not a code duplication: provides faster string concat via StringBuilder.append(int)
+ throw new IllegalArgumentException("Invalid range: " + actual + ", expected: " + expected + ".");
+ }
+
+ /**
+ * Throw an IllegalArgument exception describing a range violation.
+ *
+ * @param expected String describing expected ranges
+ * @param actual Actual observed value
+ * @throws IllegalArgumentException always
+ */
+ public static void throwInvalidRange(final String expected, final long actual) {
+ // Not a code duplication: provides faster string concat via StringBuilder.append(long)
+ throw new IllegalArgumentException("Invalid range: " + actual + ", expected: " + expected + ".");
+ }
+
/**
* Throw an IllegalArgument exception describing a range violation.
*
public static void throwInvalidRange(final Object[] expected, final Object actual) {
throwInvalidRange(Arrays.toString(expected), actual);
}
+
+ /**
+ * Throw an IllegalArgument exception describing a range violation of an Uint64 type.
+ *
+ * @param expected String describing expected ranges
+ * @param actual Actual observed value
+ * @throws IllegalArgumentException always
+ */
+ public static void throwInvalidRangeUnsigned(final String expected, final long actual) {
+ throw new IllegalArgumentException("Invalid range: " + Long.toUnsignedString(actual) + ", expected: " + expected
+ + ".");
+ }
+
+ /**
+ * Check whether specified List is null and if so return an immutable list instead. This method supports
+ * non-null default getter methods.
+ *
+ * @param input input list, may be null
+ * @return Input list or an empty list.
+ */
+ public static <T> @NonNull List<T> nonnull(final @Nullable List<T> input) {
+ return input != null ? input : ImmutableList.of();
+ }
+
+ /**
+ * 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}
+ * for both non-present and present-with-null objects.
+ *
+ * @param obj Internal object to hash
+ * @return Wrapper object hash code
+ */
+ public static int wrapperHashCode(final @Nullable Object obj) {
+ return wrapHashCode(Objects.hashCode(obj));
+ }
+
+ /**
+ * 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 Arrays#hashCode()} is not really useful we would end up with {@code 0}
+ * for both non-present and present-with-null objects.
+ *
+ * @param obj Internal object to hash
+ * @return Wrapper object hash code
+ */
+ public static int wrapperHashCode(final byte @Nullable[] obj) {
+ return wrapHashCode(Arrays.hashCode(obj));
+ }
+
+ /**
+ * The constant '31' is the result of folding this code:
+ * <pre>
+ * final int prime = 31;
+ * int result = 1;
+ * result = result * prime + Objects.hashCode(obj);
+ * return result;
+ * </pre>
+ * when hashCode is returned as 0, such as due to obj being null or its hashCode being 0.
+ *
+ * @param hash Wrapped object hash
+ * @return Wrapper object hash
+ */
+ private static int wrapHashCode(final int hash) {
+ return hash == 0 ? 31 : hash;
+ }
}
Code Review / mdsal.git / blobdiff