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Common and utility library for the Service Grid Server Software and java web services.
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/*
* This is a program for Language Grid Core Node. This combines multiple language resources and provides composite language services.
* Copyright (C) 2005-2011 NICT Language Grid Project.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 2.1 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see T[] array(T... elements){
return elements;
}
@SuppressWarnings("unchecked")
public static T[] array(Class elementClass, Object... elements){
Object ret = Array.newInstance(elementClass, elements.length);
System.arraycopy(
elements,
0,
ret,
0,
elements.length
);
return (T[])ret;
}
/**
*
*
*/
public static Character[] box(char[] elements){
Character[] ret = new Character[elements.length];
for(int i = 0; i < elements.length; i++){
ret[i] = elements[i];
}
return ret;
}
/**
*
*
*/
public static T first(T[] elements){
return elements[0];
}
/**
*
*
*/
public static T last(T[] elements){
return elements[elements.length - 1];
}
/**
*
*
*/
public static T getWithinBound(T[] elements, int index){
if(index < 0 || elements.length <= index){
return null;
} else{
return elements[index];
}
}
/**
*
*
*/
public static String toString(Object array){
Transformer transformer
= primitiveArrayTransformers.get(array.getClass());
if(transformer != null){
return transformer.transform(array);
} else if(Object[].class.isAssignableFrom(array.getClass())){
return Arrays.toString((Object[])array);
} else{
return array.toString();
}
}
/**
*
*
*/
public static boolean elementsEqual(T[] src, T[] dst){
if(src.length != dst.length) return false;
for(int i = 0; i < src.length; i++){
if(src[i] != null){
if(src[i].equals(dst[i])) continue;
else return false;
}
if(dst[i] != null){
return false;
}
}
return true;
}
/**
*
*
*/
public static T[] toArray(Iterable elements, T[] a){
List array = new ArrayList();
for(T e : elements){
array.add(e);
}
return array.toArray(a);
}
/**
*
*
*/
public static String[] emptyStrings(){
return emptyStrings_;
}
/**
*
*
*/
public static T[] clone(T[] elements){
if(elements != null){
return elements.clone();
} else{
return null;
}
}
/**
*
*
*/
public static T[] append(T[] elements, T element){
List list = new ArrayList(Arrays.asList(elements));
list.add(element);
return list.toArray(elements);
}
/**
*
*
*/
public static T[] append(T[] elements, T... elements2){
List list = new ArrayList(Arrays.asList(elements));
for(T e : elements2){
list.add(e);
}
return list.toArray(elements);
}
/**
*
*
*/
@SuppressWarnings("unchecked")
public static T[] subArray(T[] elements, int beginIndex, int endIndex){
return Arrays.asList(elements).subList(beginIndex, endIndex).toArray(
(T[])Array.newInstance(
elements.getClass().getComponentType()
, endIndex - beginIndex
)
);
}
/**
*
*
*/
public static T[] subArray(T[] elements, int beginIndex){
return subArray(elements, beginIndex, elements.length);
}
/**
*
*
*/
public static String join(String[] elements, String separator){
if(elements.length == 0) return "";
StringBuilder b = new StringBuilder();
for(String e : elements){
b.append(e);
b.append(separator);
}
b.delete(b.length() - separator.length(), b.length());
return b.toString();
}
/**
*
*
*/
public static String join(Object[] elements, String separator){
StringBuilder b = new StringBuilder();
for(Object e : elements){
b.append(e.toString());
b.append(separator);
}
b.delete(b.length() - separator.length(), b.length());
return b.toString();
}
/**
*
*
*/
@SuppressWarnings("unchecked")
public static U[] collect(
T[] elements, Class clazz, Transformer transformer)
throws TransformationException
{
U[] r = (U[])Array.newInstance(clazz, elements.length);
for(int i = 0; i < elements.length; i++){
r[i] = transformer.transform(elements[i]);
}
return r;
}
/**
*
*
*/
@SuppressWarnings("unchecked")
public static U[] collect(
T[] elements, Transformer transformer)
throws TransformationException
{
Class[] types = GenericsUtil.getTypeArgumentClasses(
transformer.getClass(), Transformer.class);
if(types == null || types[1] == null){
throw new IllegalArgumentException(
"failed to resolve target class"
);
}
U[] r = (U[])Array.newInstance(types[1], elements.length);
for(int i = 0; i < elements.length; i++){
r[i] = transformer.transform(elements[i]);
}
return r;
}
@SuppressWarnings("unchecked")
public static T[] filter(T[] elements, Predicate pred){
List ret = new ArrayList();
for(T e : elements){
if(pred.test(e)){
ret.add(e);
}
}
return ret.toArray((T[])Array.newInstance(elements.getClass().getComponentType(), 0));
}
/**
*
*
*/
public static byte[][] toBytesArray(String[] value, String encoding)
throws UnsupportedEncodingException
{
byte[][] ret = new byte[value.length][];
for(int i = 0; i < value.length; i++){
ret[i] = value[i].getBytes(encoding);
}
return ret;
}
/**
*
*
*/
public static String[] toStringArray(byte[][] value, String encoding)
throws UnsupportedEncodingException
{
String[] ret = new String[value.length];
for(int i = 0; i < value.length; i++){
ret[i] = new String(value[i], encoding);
}
return ret;
}
/**
*
*
*/
public static Object toPrimitiveArray(Collection collection, Class clazz)
throws IllegalArgumentException
{
Class p = ClassUtil.getPrimitiveClass(clazz);
if(p == null){
throw new IllegalArgumentException(clazz.getName() + " is not a wrapper class");
}
int len = collection.size();
Iterator it = collection.iterator();
Object ret = Array.newInstance(p, len);
for(int i = 0; i < len; i++){
Array.set(ret, i, it.next());
}
return ret;
}
public static Stream stream(T[] array){
return new Stream(new IteratorProvider(Arrays.asList(array).iterator()));
}
private static String[] emptyStrings_ = new String[]{};
private static Map, Transformer>
primitiveArrayTransformers = new HashMap, Transformer>();
static{
primitiveArrayTransformers.put(
boolean[].class
, new Transformer(){
public String transform(Object value)
throws TransformationException {
return Arrays.toString((boolean[])value);
}
});
primitiveArrayTransformers.put(
byte[].class
, new Transformer(){
public String transform(Object value)
throws TransformationException {
return Arrays.toString((byte[])value);
}
});
primitiveArrayTransformers.put(
char[].class
, new Transformer(){
public String transform(Object value)
throws TransformationException {
return Arrays.toString((char[])value);
}
});
primitiveArrayTransformers.put(
double[].class
, new Transformer(){
public String transform(Object value)
throws TransformationException {
return Arrays.toString((double[])value);
}
});
primitiveArrayTransformers.put(
float[].class
, new Transformer(){
public String transform(Object value)
throws TransformationException {
return Arrays.toString((float[])value);
}
});
primitiveArrayTransformers.put(
int[].class
, new Transformer(){
public String transform(Object value)
throws TransformationException {
return Arrays.toString((int[])value);
}
});
primitiveArrayTransformers.put(
long[].class
, new Transformer(){
public String transform(Object value)
throws TransformationException {
return Arrays.toString((long[])value);
}
});
primitiveArrayTransformers.put(
short[].class
, new Transformer(){
public String transform(Object value)
throws TransformationException {
return Arrays.toString((short[])value);
}
});
}
}
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