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/*
* Copyright © 2012 The Feign Authors (feign@commonhaus.dev)
*
* 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 feign;
import static java.lang.String.format;
import static java.util.Objects.nonNull;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.TreeMap;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.stream.Stream;
/** Utilities, typically copied in from guava, so as to avoid dependency conflicts. */
public class Util {
/** The HTTP Content-Length header field name. */
public static final String CONTENT_LENGTH = "Content-Length";
/** The HTTP Content-Encoding header field name. */
public static final String CONTENT_ENCODING = "Content-Encoding";
/** The HTTP Accept-Encodin
8000
g header field name. */
public static final String ACCEPT_ENCODING = "Accept-Encoding";
/** The HTTP Retry-After header field name. */
public static final String RETRY_AFTER = "Retry-After";
/** Value for the Content-Encoding header that indicates that GZIP encoding is in use. */
public static final String ENCODING_GZIP = "gzip";
/** Value for the Content-Encoding header that indicates that DEFLATE encoding is in use. */
public static final String ENCODING_DEFLATE = "deflate";
/** UTF-8: eight-bit UCS Transformation Format. */
public static final Charset UTF_8 = Charset.forName("UTF-8");
// com.google.common.base.Charsets
/** ISO-8859-1: ISO Latin Alphabet Number 1 (ISO-LATIN-1). */
public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
private static final int BUF_SIZE = 0x800; // 2K chars (4K bytes)
/** Type literal for {@code Map<String, ?>}. */
public static final Type MAP_STRING_WILDCARD =
new Types.ParameterizedTypeImpl(
null,
Map.class,
String.class,
new Types.WildcardTypeImpl(new Type[] {Object.class}, new Type[0]));
private Util() { // no instances
}
/** Copy of {@code com.google.common.base.Preconditions#checkArgument}. */
public static void checkArgument(
boolean expression, String errorMessageTemplate, Object... errorMessageArgs) {
if (!expression) {
throw new IllegalArgumentException(format(errorMessageTemplate, errorMessageArgs));
}
}
/** Copy of {@code com.google.common.base.Preconditions#checkNotNull}. */
public static <T> T checkNotNull(
T reference, String errorMessageTemplate, Object... errorMessageArgs) {
if (reference == null) {
// If either of these parameters is null, the right thing happens anyway
throw new NullPointerException(format(errorMessageTemplate, errorMessageArgs));
}
return reference;
}
/** Copy of {@code com.google.common.base.Preconditions#checkState}. */
public static void checkState(
boolean expression, String errorMessageTemplate, Object... errorMessageArgs) {
if (!expression) {
throw new IllegalStateException(format(errorMessageTemplate, errorMessageArgs));
}
}
/** Identifies a method as a default instance method. */
public static boolean isDefault(Method method) {
// Default methods are public non-abstract, non-synthetic, and non-static instance methods
// declared in an interface.
// method.isDefault() is not sufficient for our usage as it does not check
// for synthetic methods. As a result, it picks up overridden methods as well as actual default
// methods.
final int SYNTHETIC = 0x00001000;
return ((method.getModifiers()
& (Modifier.ABSTRACT | Modifier.PUBLIC | Modifier.STATIC | SYNTHETIC))
== Modifier.PUBLIC)
&& method.getDeclaringClass().isInterface();
}
/** Adapted from {@code com.google.common.base.Strings#emptyToNull}. */
public static String emptyToNull(String string) {
return string == null || string.isEmpty() ? null : string;
}
/**
* Removes values from the array that meet the criteria for removal via the supplied {@link
* Predicate} value
*/
@SuppressWarnings("unchecked")
public static <T> T[] removeValues(T[] values, Predicate<T> shouldRemove, Class<T> type) {
Collection<T> collection = new ArrayList<>(values.length);
for (T value : values) {
if (shouldRemove.negate().test(value)) {
collection.add(value);
}
}
T[] array = (T[]) Array.newInstance(type, collection.size());
return collection.toArray(array);
}
/** Adapted from {@code com.google.common.base.Strings#emptyToNull}. */
@SuppressWarnings("unchecked")
public static <T> T[] toArray(Iterable<? extends T> iterable, Class<T> type) {
Collection<T> collection;
if (iterable instanceof Collection) {
collection = (Collection<T>) iterable;
} else {
collection = new ArrayList<>();
for (T element : iterable) {
collection.add(element);
}
}
T[] array = (T[]) Array.newInstance(type, collection.size());
return collection.toArray(array);
}
/** Returns an unmodifiable collection which may be empty, but is never null. */
public static <T> Collection<T> valuesOrEmpty(Map<String, Collection<T>> map, String key) {
Collection<T> values = map.get(key);
return values != null ? values : Collections.emptyList();
}
public static void ensureClosed(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (IOException ignored) { // NOPMD
}
}
}
/** Moved to {@code feign.Types.resolveLastTypeParameter} */
@Deprecated
public static Type resolveLastTypeParameter(Type genericContext, Class<?> supertype)
throws IllegalStateException {
return Types.resolveLastTypeParameter(genericContext, supertype);
}
/**
* This returns well known empty values for well-known java types. This returns null for types not
* in the following list.
*
* <ul>
* <li>{@code [Bb]oolean}
* <li>{@code byte[]}
* <li>{@code Collection}
* <li>{@code Iterator}
* <li>{@code List}
* <li>{@code Map}
* <li>{@code Set}
* </ul>
*
* <p>When {@link Feign.Builder#dismiss404() decoding HTTP 404 status}, you'll need to teach
* decoders a default empty value for a type. This method cheaply supports typical types by only
* looking at the raw type (vs type hierarchy). Decorate for sophistication.
*/
public static Object emptyValueOf(Type type) {
return EMPTIES.getOrDefault(Types.getRawType(type), () -> null).get();
}
private static final Map<Class<?>, Supplier<Object>> EMPTIES;
static {
final Map<Class<?>, Supplier<Object>> empties = new LinkedHashMap<>();
empties.put(boolean.class, () -> false);
empties.put(Boolean.class, () -> false);
empties.put(byte[].class, () -> new byte[0]);
empties.put(Collection.class, Collections::emptyList);
empties.put(Iterator.class, Collections::emptyIterator);
empties.put(List.class, Collections::emptyList);
empties.put(Map.class, Collections::emptyMap);
empties.put(Set.class, Collections::emptySet);
empties.put(Optional.class, Optional::empty);
empties.put(Stream.class, Stream::empty);
EMPTIES = Collections.unmodifiableMap(empties);
}
/** Adapted from {@code com.google.common.io.CharStreams.toString()}. */
public static String toString(Reader reader) throws IOException {
if (reader == null) {
return null;
}
try {
StringBuilder to = new StringBuilder();
CharBuffer charBuf = CharBuffer.allocate(BUF_SIZE);
// must cast to super class Buffer otherwise break when running with java 11
Buffer buf = charBuf;
while (reader.read(charBuf) != -1) {
buf.flip();
to.append(charBuf);
buf.clear();
}
return to.toString();
} finally {
ensureClosed(reader);
}
}
/** Adapted from {@code com.google.common.io.ByteStreams.toByteArray()}. */
public static byte[] toByteArray(InputStream in) throws IOException {
checkNotNull(in, "in");
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
copy(in, out);
return out.toByteArray();
} finally {
ensureClosed(in);
}
}
/** Adapted from {@code com.google.common.io.ByteStreams.copy()}. */
private static long copy(InputStream from, OutputStream to) throws IOException {
checkNotNull(from, "from");
checkNotNull(to, "to");
byte[] buf = new byte[BUF_SIZE];
long total = 0;
while (true) {
int r = from.read(buf);
if (r == -1) {
break;
}
to.write(buf, 0, r);
total += r;
}
return total;
}
public static String decodeOrDefault(byte[] data, Charset charset, String defaultValue) {
if (data == null) {
return defaultValue;
}
checkNotNull(charset, "charset");
try {
return charset.newDecoder().decode(ByteBuffer.wrap(data)).toString();
} catch (CharacterCodingException ex) {
return defaultValue;
}
}
/**
* If the provided String is not null or empty.
*
* @param value to evaluate.
* @return true of the value is not null and not empty.
*/
public static boolean isNotBlank(String value) {
return value != null && !value.isEmpty();
}
/**
* If the provided String is null or empty.
*
* @param value to evaluate.
* @return true if the value is null or empty.
*/
public static boolean isBlank(String value) {
return value == null || value.isEmpty();
}
/**
* Copy entire map of string collection.
*
* <p>The copy is unmodifiable map of unmodifiable collections.
*
* @param map string collection map
* @return copy of the map or an empty map if the map is null.
*/
public static Map<String, Collection<String>> caseInsensitiveCopyOf(
Map<String, Collection<String>> map) {
if (map == null) {
return Collections.emptyMap();
}
Map<String, Collection<String>> result = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
for (Map.Entry<String, Collection<String>> entry : map.entrySet()) {
String key = entry.getKey();
if (!result.containsKey(key)) {
result.put(key.toLowerCase(Locale.ROOT), new LinkedList<>());
}
result.get(key).addAll(entry.getValue());
}
result.replaceAll((key, value) -> Collections.unmodifiableCollection(value));
return Collections.unmodifiableMap(result);
}
public static <T extends Enum<?>> T enumForName(Class<T> enumClass, Object object) {
String name = (nonNull(object)) ? object.toString() : null;
for (T enumItem : enumClass.getEnumConstants()) {
if (enumItem.name().equalsIgnoreCase(name) || enumItem.toString().equalsIgnoreCase(name)) {
return enumItem;
}
}
return null;
}
public static List<Field> allFields(Class<?> clazz) {
if (Objects.equals(clazz, Object.class)) {
return Collections.emptyList();
}
List<Field> fields = new ArrayList<>();
fields.addAll(Arrays.asList(clazz.getDeclaredFields()));
fields.addAll(allFields(clazz.getSuperclass()));
return fields;
}
public static String getThreadIdentifier() {
Thread currentThread = Thread.currentThread();
return currentThread.getThreadGroup()
+ "_"
+ currentThread.getName()
+ "_"
+ currentThread.getId();
}
}