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With inspiration from other libraries
// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
package com.ibm.icu.impl.locale;
import java.io.BufferedReader;
import java.io.File;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.ibm.icu.util.ICUException;
import com.ibm.icu.util.ICUUncheckedIOException;
/**
* Stub class to make migration easier until we get either Guava or a higher level of Java.
*/
public class XCldrStub {
public static class Multimap {
private final Map> map;
private final Class> setClass;
@SuppressWarnings("unchecked")
private Multimap(Map> map, Class setClass) {
this.map = map;
this.setClass = (Class>) (setClass != null
? setClass
: HashSet.class);
}
public Multimap putAll(K key, V... values) {
if (values.length != 0) {
createSetIfMissing(key).addAll(Arrays.asList(values));
}
return this;
}
public void putAll(K key, Collection values) {
if (!values.isEmpty()) {
createSetIfMissing(key).addAll(values);
}
}
public void putAll(Collection keys, V value) {
for (K key : keys) {
put(key, value);
}
}
public void putAll(Multimap source) {
for (Entry> entry : source.map.entrySet()) {
putAll(entry.getKey(), entry.getValue());
}
}
public void put(K key, V value) {
createSetIfMissing(key).add(value);
}
private Set createSetIfMissing(K key) {
Set old = map.get(key);
if (old == null) {
map.put(key, old = getInstance());
}
return old;
}
private Set getInstance() {
try {
return setClass.newInstance();
} catch (Exception e) {
throw new ICUException(e);
}
}
public Set get(K key) {
Set result = map.get(key);
return result; // == null ? Collections.emptySet() : result;
}
public Set keySet() {
return map.keySet();
}
public Map> asMap() {
return map;
}
public Set values() {
Collection> values = map.values();
if (values.size() == 0) {
return Collections.emptySet();
}
Set result = getInstance();
for ( Set valueSet : values) {
result.addAll(valueSet);
}
return result;
}
public int size() {
return map.size();
}
public Iterable> entries() {
return new MultimapIterator(map);
}
@Override
public boolean equals(Object obj) {
return this == obj ||
(obj != null
&& obj.getClass() == this.getClass()
&& map.equals(((Multimap) obj).map));
}
@Override
public int hashCode() {
return map.hashCode();
}
}
public static class Multimaps {
public static > R invertFrom(Multimap source, R target) {
for (Entry> entry : source.asMap().entrySet()) {
target.putAll(entry.getValue(), entry.getKey());
}
return target;
}
public static > R invertFrom(Map source, R target) {
for (Entry entry : source.entrySet()) {
target.put(entry.getValue(), entry.getKey());
}
return target;
}
/**
* Warning, not functionally the same as Guava; only for use in invertFrom.
*/
public static Map forMap(Map map) {
return map;
}
}
private static class MultimapIterator implements Iterator>, Iterable> {
private final Iterator>> it1;
private Iterator it2 = null;
private final ReusableEntry entry = new ReusableEntry();
private MultimapIterator(Map> map) {
it1 = map.entrySet().iterator();
}
@Override
public boolean hasNext() {
return it1.hasNext() || it2 != null && it2.hasNext();
}
@Override
public Entry next() {
if (it2 != null && it2.hasNext()) {
entry.value = it2.next();
} else {
Entry> e = it1.next();
entry.key = e.getKey();
it2 = e.getValue().iterator();
}
return entry;
}
@Override
public Iterator> iterator() {
return this;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
private static class ReusableEntry implements Entry {
K key;
V value;
@Override
public K getKey() {
return key;
}
@Override
public V getValue() {
return value;
}
@Override
public V setValue(V value) {
throw new UnsupportedOperationException();
}
}
public static class HashMultimap extends Multimap {
private HashMultimap() {
super(new HashMap>(), HashSet.class);
}
public static HashMultimap create() {
return new HashMultimap();
}
}
public static class TreeMultimap extends Multimap {
private TreeMultimap() {
super(new TreeMap>(), TreeSet.class);
}
public static TreeMultimap create() {
return new TreeMultimap();
}
}
public static class LinkedHashMultimap extends Multimap {
private LinkedHashMultimap() {
super(new LinkedHashMap>(), LinkedHashSet.class);
}
public static LinkedHashMultimap create() {
return new LinkedHashMultimap();
}
}
// public static class Counter implements Iterable{
// private Map data;
// @Override
// public Iterator iterator() {
// return data.keySet().iterator();
// }
// public long get(T s) {
// Long result = data.get(s);
// return result != null ? result : 0L;
// }
// public void add(T item, int count) {
// Long result = data.get(item);
// data.put(item, result == null ? count : result + count);
// }
// }
public static String join(T[] source, String separator) {
StringBuilder result = new StringBuilder();
for (int i = 0; i < source.length; ++i) {
if (i != 0) result.append(separator);
result.append(source[i]);
}
return result.toString();
}
public static String join(Iterable source, String separator) {
StringBuilder result = new StringBuilder();
boolean first = true;
for (T item : source) {
if (!first) result.append(separator);
else first = false;
result.append(item.toString());
}
return result.toString();
}
public static class CollectionUtilities {
public static > String join(U source, String separator) {
return XCldrStub.join(source, separator);
}
}
public static class Joiner {
private final String separator;
private Joiner(String separator) {
this.separator = separator;
}
public static final Joiner on(String separator) {
return new Joiner(separator);
}
public String join(T[] source) {
return XCldrStub.join(source, separator);
}
public String join(Iterable source) {
return XCldrStub.join(source, separator);
}
}
public static class Splitter {
Pattern pattern;
boolean trimResults = false;
public Splitter(char c) {
this(Pattern.compile("\\Q" + c + "\\E"));
}
public Splitter(Pattern p) {
pattern = p;
}
public static Splitter on(char c) {
return new Splitter(c);
}
public static Splitter on(Pattern p) {
return new Splitter(p);
}
public List splitToList(String input) {
String[] items = pattern.split(input);
if (trimResults) {
for (int i = 0; i < items.length; ++i) {
items[i] = items[i].trim();
}
}
return Arrays.asList(items);
}
public Splitter trimResults() {
trimResults = true;
return this;
}
public Iterable split(String input) {
return splitToList(input);
}
}
public static class ImmutableSet {
public static Set copyOf(Set values) {
return Collections.unmodifiableSet(new LinkedHashSet(values)); // copy set for safety, preserve order
}
}
public static class ImmutableMap {
public static Map copyOf(Map values) {
return Collections.unmodifiableMap(new LinkedHashMap(values)); // copy set for safety, preserve order
}
}
public static class ImmutableMultimap {
public static Multimap copyOf(Multimap values) {
LinkedHashMap> temp = new LinkedHashMap>(); // semi-deep copy, preserve order
for (Entry> entry : values.asMap().entrySet()) {
Set value = entry.getValue();
temp.put(entry.getKey(), value.size() == 1
? Collections.singleton(value.iterator().next())
: Collections.unmodifiableSet(new LinkedHashSet(value)));
}
return new Multimap(Collections.unmodifiableMap(temp), null);
}
}
public static class FileUtilities {
public static final Charset UTF8 = Charset.forName("utf-8");
public static BufferedReader openFile(Class class1, String file) {
return openFile(class1, file, UTF8);
}
public static BufferedReader openFile(Class class1, String file, Charset charset) {
// URL path = null;
// String externalForm = null;
try {
final InputStream resourceAsStream = class1.getResourceAsStream(file);
if (charset == null) {
charset = UTF8;
}
InputStreamReader reader = new InputStreamReader(resourceAsStream, charset);
BufferedReader bufferedReader = new BufferedReader(reader, 1024 * 64);
return bufferedReader;
} catch (Exception e) {
String className = class1 == null ? null : class1.getCanonicalName();
String canonicalName = null;
try {
String relativeFileName = getRelativeFileName(class1, "../util/");
canonicalName = new File(relativeFileName).getCanonicalPath();
} catch (Exception e1) {
throw new ICUUncheckedIOException("Couldn't open file: " + file + "; relative to class: "
+ className, e);
}
throw new ICUUncheckedIOException("Couldn't open file " + file + "; in path " + canonicalName + "; relative to class: "
+ className, e);
}
}
public static String getRelativeFileName(Class class1, String filename) {
URL resource = class1 == null ?
FileUtilities.class.getResource(filename) : class1.getResource(filename);
String resourceString = resource.toString();
if (resourceString.startsWith("file:")) {
return resourceString.substring(5);
} else if (resourceString.startsWith("jar:file:")) {
return resourceString.substring(9);
} else {
throw new ICUUncheckedIOException("File not found: " + resourceString);
}
}
}
static public class RegexUtilities {
public static int findMismatch(Matcher m, CharSequence s) {
int i;
for (i = 1; i < s.length(); ++i) {
boolean matches = m.reset(s.subSequence(0, i)).matches();
if (!matches && !m.hitEnd()) {
break;
}
}
return i - 1;
}
public static String showMismatch(Matcher m, CharSequence s) {
int failPoint = findMismatch(m, s);
String show = s.subSequence(0, failPoint) + "☹" + s.subSequence(failPoint, s.length());
return show;
}
}
public interface Predicate {
/**
* Evaluates this predicate on the given argument.
*
* @param t the input argument
* @return {@code true} if the input argument matches the predicate,
* otherwise {@code false}
*/
boolean test(T t);
}
}