mirror of
https://github.com/Eaglercraft-Archive/Eaglercraftx-1.8.8-src.git
synced 2025-06-28 02:48:14 -05:00
Update #0 - First Release
This commit is contained in:
LAX1DUDE
252
sources/main/java/com/google/common/collect/ObjectArrays.java
Normal file
252
sources/main/java/com/google/common/collect/ObjectArrays.java
Normal file
@ -0,0 +1,252 @@
|
||||
/*
|
||||
* Copyright (C) 2007 The Guava Authors
|
||||
*
|
||||
* 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 com.google.common.collect;
|
||||
|
||||
import static com.google.common.base.Preconditions.checkPositionIndexes;
|
||||
|
||||
import java.lang.reflect.Array;
|
||||
import java.util.Collection;
|
||||
|
||||
import javax.annotation.Nullable;
|
||||
|
||||
import com.google.common.annotations.GwtCompatible;
|
||||
import com.google.common.annotations.GwtIncompatible;
|
||||
|
||||
/**
|
||||
* Static utility methods pertaining to object arrays.
|
||||
*
|
||||
* @author Kevin Bourrillion
|
||||
* @since 2.0 (imported from Google Collections Library)
|
||||
*/
|
||||
@GwtCompatible(emulated = true)
|
||||
public final class ObjectArrays {
|
||||
static final Object[] EMPTY_ARRAY = new Object[0];
|
||||
|
||||
private ObjectArrays() {
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a new array of the given length with the specified component type.
|
||||
*
|
||||
* @param type the component type
|
||||
* @param length the length of the new array
|
||||
*/
|
||||
@GwtIncompatible("Array.newInstance(Class, int)")
|
||||
@SuppressWarnings("unchecked")
|
||||
public static <T> T[] newArray(Class<T> type, int length) {
|
||||
return (T[]) Array.newInstance(type, length);
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a new array of the given length with the same type as a reference
|
||||
* array.
|
||||
*
|
||||
* @param reference any array of the desired type
|
||||
* @param length the length of the new array
|
||||
*/
|
||||
public static <T> T[] newArray(T[] reference, int length) {
|
||||
return Platform.newArray(reference, length);
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a new array that contains the concatenated contents of two arrays.
|
||||
*
|
||||
* @param first the first array of elements to concatenate
|
||||
* @param second the second array of elements to concatenate
|
||||
* @param type the component type of the returned array
|
||||
*/
|
||||
@GwtIncompatible("Array.newInstance(Class, int)")
|
||||
public static <T> T[] concat(T[] first, T[] second, Class<T> type) {
|
||||
T[] result = newArray(type, first.length + second.length);
|
||||
System.arraycopy(first, 0, result, 0, first.length);
|
||||
System.arraycopy(second, 0, result, first.length, second.length);
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a new array that prepends {@code element} to {@code array}.
|
||||
*
|
||||
* @param element the element to prepend to the front of {@code array}
|
||||
* @param array the array of elements to append
|
||||
* @return an array whose size is one larger than {@code array}, with
|
||||
* {@code element} occupying the first position, and the elements of
|
||||
* {@code array} occupying the remaining elements.
|
||||
*/
|
||||
public static <T> T[] concat(@Nullable T element, T[] array) {
|
||||
T[] result = newArray(array, array.length + 1);
|
||||
result[0] = element;
|
||||
System.arraycopy(array, 0, result, 1, array.length);
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a new array that appends {@code element} to {@code array}.
|
||||
*
|
||||
* @param array the array of elements to prepend
|
||||
* @param element the element to append to the end
|
||||
* @return an array whose size is one larger than {@code array}, with the same
|
||||
* contents as {@code array}, plus {@code element} occupying the last
|
||||
* position.
|
||||
*/
|
||||
public static <T> T[] concat(T[] array, @Nullable T element) {
|
||||
T[] result = arraysCopyOf(array, array.length + 1);
|
||||
result[array.length] = element;
|
||||
return result;
|
||||
}
|
||||
|
||||
/** GWT safe version of Arrays.copyOf. */
|
||||
static <T> T[] arraysCopyOf(T[] original, int newLength) {
|
||||
T[] copy = newArray(original, newLength);
|
||||
System.arraycopy(original, 0, copy, 0, Math.min(original.length, newLength));
|
||||
return copy;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns an array containing all of the elements in the specified collection;
|
||||
* the runtime type of the returned array is that of the specified array. If the
|
||||
* collection fits in the specified array, it is returned therein. Otherwise, a
|
||||
* new array is allocated with the runtime type of the specified array and the
|
||||
* size of the specified collection.
|
||||
*
|
||||
* <p>
|
||||
* If the collection fits in the specified array with room to spare (i.e., the
|
||||
* array has more elements than the collection), the element in the array
|
||||
* immediately following the end of the collection is set to {@code null}. This
|
||||
* is useful in determining the length of the collection <i>only</i> if the
|
||||
* caller knows that the collection does not contain any null elements.
|
||||
*
|
||||
* <p>
|
||||
* This method returns the elements in the order they are returned by the
|
||||
* collection's iterator.
|
||||
*
|
||||
* <p>
|
||||
* TODO(kevinb): support concurrently modified collections?
|
||||
*
|
||||
* @param c the collection for which to return an array of elements
|
||||
* @param array the array in which to place the collection elements
|
||||
* @throws ArrayStoreException if the runtime type of the specified array is not
|
||||
* a supertype of the runtime type of every element
|
||||
* in the specified collection
|
||||
*/
|
||||
static <T> T[] toArrayImpl(Collection<?> c, T[] array) {
|
||||
int size = c.size();
|
||||
if (array.length < size) {
|
||||
array = newArray(array, size);
|
||||
}
|
||||
fillArray(c, array);
|
||||
if (array.length > size) {
|
||||
array[size] = null;
|
||||
}
|
||||
return array;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of {@link Collection#toArray(Object[])} for collections backed
|
||||
* by an object array. the runtime type of the returned array is that of the
|
||||
* specified array. If the collection fits in the specified array, it is
|
||||
* returned therein. Otherwise, a new array is allocated with the runtime type
|
||||
* of the specified array and the size of the specified collection.
|
||||
*
|
||||
* <p>
|
||||
* If the collection fits in the specified array with room to spare (i.e., the
|
||||
* array has more elements than the collection), the element in the array
|
||||
* immediately following the end of the collection is set to {@code null}. This
|
||||
* is useful in determining the length of the collection <i>only</i> if the
|
||||
* caller knows that the collection does not contain any null elements.
|
||||
*/
|
||||
static <T> T[] toArrayImpl(Object[] src, int offset, int len, T[] dst) {
|
||||
checkPositionIndexes(offset, offset + len, src.length);
|
||||
if (dst.length < len) {
|
||||
dst = newArray(dst, len);
|
||||
} else if (dst.length > len) {
|
||||
dst[len] = null;
|
||||
}
|
||||
System.arraycopy(src, offset, dst, 0, len);
|
||||
return dst;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns an array containing all of the elements in the specified collection.
|
||||
* This method returns the elements in the order they are returned by the
|
||||
* collection's iterator. The returned array is "safe" in that no references to
|
||||
* it are maintained by the collection. The caller is thus free to modify the
|
||||
* returned array.
|
||||
*
|
||||
* <p>
|
||||
* This method assumes that the collection size doesn't change while the method
|
||||
* is running.
|
||||
*
|
||||
* <p>
|
||||
* TODO(kevinb): support concurrently modified collections?
|
||||
*
|
||||
* @param c the collection for which to return an array of elements
|
||||
*/
|
||||
static Object[] toArrayImpl(Collection<?> c) {
|
||||
return fillArray(c, new Object[c.size()]);
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a copy of the specified subrange of the specified array that is
|
||||
* literally an Object[], and not e.g. a {@code String[]}.
|
||||
*/
|
||||
static Object[] copyAsObjectArray(Object[] elements, int offset, int length) {
|
||||
checkPositionIndexes(offset, offset + length, elements.length);
|
||||
if (length == 0) {
|
||||
return EMPTY_ARRAY;
|
||||
}
|
||||
Object[] result = new Object[length];
|
||||
System.arraycopy(elements, offset, result, 0, length);
|
||||
return result;
|
||||
}
|
||||
|
||||
private static Object[] fillArray(Iterable<?> elements, Object[] array) {
|
||||
int i = 0;
|
||||
for (Object element : elements) {
|
||||
array[i++] = element;
|
||||
}
|
||||
return array;
|
||||
}
|
||||
|
||||
/**
|
||||
* Swaps {@code array[i]} with {@code array[j]}.
|
||||
*/
|
||||
static void swap(Object[] array, int i, int j) {
|
||||
Object temp = array[i];
|
||||
array[i] = array[j];
|
||||
array[j] = temp;
|
||||
}
|
||||
|
||||
static Object[] checkElementsNotNull(Object... array) {
|
||||
return checkElementsNotNull(array, array.length);
|
||||
}
|
||||
|
||||
static Object[] checkElementsNotNull(Object[] array, int length) {
|
||||
for (int i = 0; i < length; i++) {
|
||||
checkElementNotNull(array[i], i);
|
||||
}
|
||||
return array;
|
||||
}
|
||||
|
||||
// We do this instead of Preconditions.checkNotNull to save boxing and array
|
||||
// creation cost.
|
||||
static Object checkElementNotNull(Object element, int index) {
|
||||
if (element == null) {
|
||||
throw new NullPointerException("at index " + index);
|
||||
}
|
||||
return element;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user