JDK8/Java8源码在线阅读
/*
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.util;
import java.util.concurrent.RecursiveAction;
import java.util.concurrent.CountedCompleter;
/**
* Helper utilities for the parallel sort methods in Arrays.parallelSort.
*
* For each primitive type, plus Object, we define a static class to
* contain the Sorter and Merger implementations for that type:
*
* Sorter classes based mainly on CilkSort
* <A href="http://supertech.lcs.mit.edu/cilk/"> Cilk</A>:
* Basic algorithm:
* if array size is small, just use a sequential quicksort (via Arrays.sort)
* Otherwise:
* 1. Break array in half.
* 2. For each half,
* a. break the half in half (i.e., quarters),
* b. sort the quarters
* c. merge them together
* 3. merge together the two halves.
*
* One reason for splitting in quarters is that this guarantees that
* the final sort is in the main array, not the workspace array.
* (workspace and main swap roles on each subsort step.) Leaf-level
* sorts use the associated sequential sort.
*
* Merger classes perform merging for Sorter. They are structured
* such that if the underlying sort is stable (as is true for
* TimSort), then so is the full sort. If big enough, they split the
* largest of the two partitions in half, find the greatest point in
* smaller partition less than the beginning of the second half of
* larger via binary search; and then merge in parallel the two
* partitions. In part to ensure tasks are triggered in
* stability-preserving order, the current CountedCompleter design
* requires some little tasks to serve as place holders for triggering
* completion tasks. These classes (EmptyCompleter and Relay) don't
* need to keep track of the arrays, and are never themselves forked,
* so don't hold any task state.
*
* The primitive class versions (FJByte... FJDouble) are
* identical to each other except for type declarations.
*
* The base sequential sorts rely on non-public versions of TimSort,
* ComparableTimSort, and DualPivotQuicksort sort methods that accept
* temp workspace array slices that we will have already allocated, so
* avoids redundant allocation. (Except for DualPivotQuicksort byte[]
* sort, that does not ever use a workspace array.)
*/
/*package*/ class ArraysParallelSortHelpers {
/*
* Style note: The task classes have a lot of parameters, that are
* stored as task fields and copied to local variables and used in
* compute() methods, We pack these into as few lines as possible,
* and hoist consistency checks among them before main loops, to
* reduce distraction.
*/
/**
* A placeholder task for Sorters, used for the lowest
* quartile task, that does not need to maintain array state.
*/
static final class EmptyCompleter extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
EmptyCompleter(CountedCompleter<?> p) { super(p); }
public final void compute() { }
}
/**
* A trigger for secondary merge of two merges
*/
static final class Relay extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final CountedCompleter<?> task;
Relay(CountedCompleter<?> task) {
super(null, 1);
this.task = task;
}
public final void compute() { }
public final void onCompletion(CountedCompleter<?> t) {
task.compute();
}
}
/** Object + Comparator support class */
static final class FJObject {
static final class Sorter<T> extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final T[] a, w;
final int base, size, wbase, gran;
Comparator<? super T> comparator;
Sorter(CountedCompleter<?> par, T[] a, T[] w, int base, int size,
int wbase, int gran,
Comparator<? super T> comparator) {
super(par);
this.a = a; this.w = w; this.base = base; this.size = size;
this.wbase = wbase; this.gran = gran;
this.comparator = comparator;
}
public final void compute() {
CountedCompleter<?> s = this;
Comparator<? super T> c = this.comparator;
T[] a = this.a, w = this.w; // localize all params
int b = this.base, n = this.size, wb = this.wbase, g = this.gran;
while (n > g) {
int h = n >>> 1, q = h >>> 1, u = h + q; // quartiles
Relay fc = new Relay(new Merger<T>(s, w, a, wb, h,
wb+h, n-h, b, g, c));
Relay rc = new Relay(new Merger<T>(fc, a, w, b+h, q,
b+u, n-u, wb+h, g, c));
new Sorter<T>(rc, a, w, b+u, n-u, wb+u, g, c).fork();
new Sorter<T>(rc, a, w, b+h, q, wb+h, g, c).fork();;
Relay bc = new Relay(new Merger<T>(fc, a, w, b, q,
b+q, h-q, wb, g, c));
new Sorter<T>(bc, a, w, b+q, h-q, wb+q, g, c).fork();
s = new EmptyCompleter(bc);
n = q;
}
TimSort.sort(a, b, b + n, c, w, wb, n);
s.tryComplete();
}
}
static final class Merger<T> extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final T[] a, w; // main and workspace arrays
final int lbase, lsize, rbase, rsize, wbase, gran;
Comparator<? super T> comparator;
Merger(CountedCompleter<?> par, T[] a, T[] w,
int lbase, int lsize, int rbase,
int rsize, int wbase, int gran,
Comparator<? super T> comparator) {
super(par);
this.a = a; this.w = w;
this.lbase = lbase; this.lsize = lsize;
this.rbase = rbase; this.rsize = rsize;
this.wbase = wbase; this.gran = gran;
this.comparator = comparator;
}
public final void compute() {
Comparator<? super T> c = this.comparator;
T[] a = this.a, w = this.w; // localize all params
int lb = this.lbase, ln = this.lsize, rb = this.rbase,
rn = this.rsize, k = this.wbase, g = this.gran;
if (a == null || w == null || lb < 0 || rb < 0 || k < 0 ||
c == null)
throw new IllegalStateException(); // hoist checks
for (int lh, rh;;) { // split larger, find point in smaller
if (ln >= rn) {
if (ln <= g)
break;
rh = rn;
T split = a[(lh = ln >>> 1) + lb];
for (int lo = 0; lo < rh; ) {
int rm = (lo + rh) >>> 1;
if (c.compare(split, a[rm + rb]) <= 0)
rh = rm;
else
lo = rm + 1;
}
}
else {
if (rn <= g)
break;
lh = ln;
T split = a[(rh = rn >>> 1) + rb];
for (int lo = 0; lo < lh; ) {
int lm = (lo + lh) >>> 1;
if (c.compare(split, a[lm + lb]) <= 0)
lh = lm;
else
lo = lm + 1;
}
}
Merger<T> m = new Merger<T>(this, a, w, lb + lh, ln - lh,
rb + rh, rn - rh,
k + lh + rh, g, c);
rn = rh;
ln = lh;
addToPendingCount(1);
m.fork();
}
int lf = lb + ln, rf = rb + rn; // index bounds
while (lb < lf && rb < rf) {
T t, al, ar;
if (c.compare((al = a[lb]), (ar = a[rb])) <= 0) {
lb++; t = al;
}
else {
rb++; t = ar;
}
w[k++] = t;
}
if (rb < rf)
System.arraycopy(a, rb, w, k, rf - rb);
else if (lb < lf)
System.arraycopy(a, lb, w, k, lf - lb);
tryComplete();
}
}
} // FJObject
/** byte support class */
static final class FJByte {
static final class Sorter extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final byte[] a, w;
final int base, size, wbase, gran;
Sorter(CountedCompleter<?> par, byte[] a, byte[] w, int base,
int size, int wbase, int gran) {
super(par);
this.a = a; this.w = w; this.base = base; this.size = size;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
CountedCompleter<?> s = this;
byte[] a = this.a, w = this.w; // localize all params
int b = this.base, n = this.size, wb = this.wbase, g = this.gran;
while (n > g) {
int h = n >>> 1, q = h >>> 1, u = h + q; // quartiles
Relay fc = new Relay(new Merger(s, w, a, wb, h,
wb+h, n-h, b, g));
Relay rc = new Relay(new Merger(fc, a, w, b+h, q,
b+u, n-u, wb+h, g));
new Sorter(rc, a, w, b+u, n-u, wb+u, g).fork();
new Sorter(rc, a, w, b+h, q, wb+h, g).fork();;
Relay bc = new Relay(new Merger(fc, a, w, b, q,
b+q, h-q, wb, g));
new Sorter(bc, a, w, b+q, h-q, wb+q, g).fork();
s = new EmptyCompleter(bc);
n = q;
}
DualPivotQuicksort.sort(a, b, b + n - 1);
s.tryComplete();
}
}
static final class Merger extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final byte[] a, w; // main and workspace arrays
final int lbase, lsize, rbase, rsize, wbase, gran;
Merger(CountedCompleter<?> par, byte[] a, byte[] w,
int lbase, int lsize, int rbase,
int rsize, int wbase, int gran) {
super(par);
this.a = a; this.w = w;
this.lbase = lbase; this.lsize = lsize;
this.rbase = rbase; this.rsize = rsize;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
byte[] a = this.a, w = this.w; // localize all params
int lb = this.lbase, ln = this.lsize, rb = this.rbase,
rn = this.rsize, k = this.wbase, g = this.gran;
if (a == null || w == null || lb < 0 || rb < 0 || k < 0)
throw new IllegalStateException(); // hoist checks
for (int lh, rh;;) { // split larger, find point in smaller
if (ln >= rn) {
if (ln <= g)
break;
rh = rn;
byte split = a[(lh = ln >>> 1) + lb];
for (int lo = 0; lo < rh; ) {
int rm = (lo + rh) >>> 1;
if (split <= a[rm + rb])
rh = rm;
else
lo = rm + 1;
}
}
else {
if (rn <= g)
break;
lh = ln;
byte split = a[(rh = rn >>> 1) + rb];
for (int lo = 0; lo < lh; ) {
int lm = (lo + lh) >>> 1;
if (split <= a[lm + lb])
lh = lm;
else
lo = lm + 1;
}
}
Merger m = new Merger(this, a, w, lb + lh, ln - lh,
rb + rh, rn - rh,
k + lh + rh, g);
rn = rh;
ln = lh;
addToPendingCount(1);
m.fork();
}
int lf = lb + ln, rf = rb + rn; // index bounds
while (lb < lf && rb < rf) {
byte t, al, ar;
if ((al = a[lb]) <= (ar = a[rb])) {
lb++; t = al;
}
else {
rb++; t = ar;
}
w[k++] = t;
}
if (rb < rf)
System.arraycopy(a, rb, w, k, rf - rb);
else if (lb < lf)
System.arraycopy(a, lb, w, k, lf - lb);
tryComplete();
}
}
} // FJByte
/** char support class */
static final class FJChar {
static final class Sorter extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final char[] a, w;
final int base, size, wbase, gran;
Sorter(CountedCompleter<?> par, char[] a, char[] w, int base,
int size, int wbase, int gran) {
super(par);
this.a = a; this.w = w; this.base = base; this.size = size;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
CountedCompleter<?> s = this;
char[] a = this.a, w = this.w; // localize all params
int b = this.base, n = this.size, wb = this.wbase, g = this.gran;
while (n > g) {
int h = n >>> 1, q = h >>> 1, u = h + q; // quartiles
Relay fc = new Relay(new Merger(s, w, a, wb, h,
wb+h, n-h, b, g));
Relay rc = new Relay(new Merger(fc, a, w, b+h, q,
b+u, n-u, wb+h, g));
new Sorter(rc, a, w, b+u, n-u, wb+u, g).fork();
new Sorter(rc, a, w, b+h, q, wb+h, g).fork();;
Relay bc = new Relay(new Merger(fc, a, w, b, q,
b+q, h-q, wb, g));
new Sorter(bc, a, w, b+q, h-q, wb+q, g).fork();
s = new EmptyCompleter(bc);
n = q;
}
DualPivotQuicksort.sort(a, b, b + n - 1, w, wb, n);
s.tryComplete();
}
}
static final class Merger extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final char[] a, w; // main and workspace arrays
final int lbase, lsize, rbase, rsize, wbase, gran;
Merger(CountedCompleter<?> par, char[] a, char[] w,
int lbase, int lsize, int rbase,
int rsize, int wbase, int gran) {
super(par);
this.a = a; this.w = w;
this.lbase = lbase; this.lsize = lsize;
this.rbase = rbase; this.rsize = rsize;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
char[] a = this.a, w = this.w; // localize all params
int lb = this.lbase, ln = this.lsize, rb = this.rbase,
rn = this.rsize, k = this.wbase, g = this.gran;
if (a == null || w == null || lb < 0 || rb < 0 || k < 0)
throw new IllegalStateException(); // hoist checks
for (int lh, rh;;) { // split larger, find point in smaller
if (ln >= rn) {
if (ln <= g)
break;
rh = rn;
char split = a[(lh = ln >>> 1) + lb];
for (int lo = 0; lo < rh; ) {
int rm = (lo + rh) >>> 1;
if (split <= a[rm + rb])
rh = rm;
else
lo = rm + 1;
}
}
else {
if (rn <= g)
break;
lh = ln;
char split = a[(rh = rn >>> 1) + rb];
for (int lo = 0; lo < lh; ) {
int lm = (lo + lh) >>> 1;
if (split <= a[lm + lb])
lh = lm;
else
lo = lm + 1;
}
}
Merger m = new Merger(this, a, w, lb + lh, ln - lh,
rb + rh, rn - rh,
k + lh + rh, g);
rn = rh;
ln = lh;
addToPendingCount(1);
m.fork();
}
int lf = lb + ln, rf = rb + rn; // index bounds
while (lb < lf && rb < rf) {
char t, al, ar;
if ((al = a[lb]) <= (ar = a[rb])) {
lb++; t = al;
}
else {
rb++; t = ar;
}
w[k++] = t;
}
if (rb < rf)
System.arraycopy(a, rb, w, k, rf - rb);
else if (lb < lf)
System.arraycopy(a, lb, w, k, lf - lb);
tryComplete();
}
}
} // FJChar
/** short support class */
static final class FJShort {
static final class Sorter extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final short[] a, w;
final int base, size, wbase, gran;
Sorter(CountedCompleter<?> par, short[] a, short[] w, int base,
int size, int wbase, int gran) {
super(par);
this.a = a; this.w = w; this.base = base; this.size = size;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
CountedCompleter<?> s = this;
short[] a = this.a, w = this.w; // localize all params
int b = this.base, n = this.size, wb = this.wbase, g = this.gran;
while (n > g) {
int h = n >>> 1, q = h >>> 1, u = h + q; // quartiles
Relay fc = new Relay(new Merger(s, w, a, wb, h,
wb+h, n-h, b, g));
Relay rc = new Relay(new Merger(fc, a, w, b+h, q,
b+u, n-u, wb+h, g));
new Sorter(rc, a, w, b+u, n-u, wb+u, g).fork();
new Sorter(rc, a, w, b+h, q, wb+h, g).fork();;
Relay bc = new Relay(new Merger(fc, a, w, b, q,
b+q, h-q, wb, g));
new Sorter(bc, a, w, b+q, h-q, wb+q, g).fork();
s = new EmptyCompleter(bc);
n = q;
}
DualPivotQuicksort.sort(a, b, b + n - 1, w, wb, n);
s.tryComplete();
}
}
static final class Merger extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final short[] a, w; // main and workspace arrays
final int lbase, lsize, rbase, rsize, wbase, gran;
Merger(CountedCompleter<?> par, short[] a, short[] w,
int lbase, int lsize, int rbase,
int rsize, int wbase, int gran) {
super(par);
this.a = a; this.w = w;
this.lbase = lbase; this.lsize = lsize;
this.rbase = rbase; this.rsize = rsize;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
short[] a = this.a, w = this.w; // localize all params
int lb = this.lbase, ln = this.lsize, rb = this.rbase,
rn = this.rsize, k = this.wbase, g = this.gran;
if (a == null || w == null || lb < 0 || rb < 0 || k < 0)
throw new IllegalStateException(); // hoist checks
for (int lh, rh;;) { // split larger, find point in smaller
if (ln >= rn) {
if (ln <= g)
break;
rh = rn;
short split = a[(lh = ln >>> 1) + lb];
for (int lo = 0; lo < rh; ) {
int rm = (lo + rh) >>> 1;
if (split <= a[rm + rb])
rh = rm;
else
lo = rm + 1;
}
}
else {
if (rn <= g)
break;
lh = ln;
short split = a[(rh = rn >>> 1) + rb];
for (int lo = 0; lo < lh; ) {
int lm = (lo + lh) >>> 1;
if (split <= a[lm + lb])
lh = lm;
else
lo = lm + 1;
}
}
Merger m = new Merger(this, a, w, lb + lh, ln - lh,
rb + rh, rn - rh,
k + lh + rh, g);
rn = rh;
ln = lh;
addToPendingCount(1);
m.fork();
}
int lf = lb + ln, rf = rb + rn; // index bounds
while (lb < lf && rb < rf) {
short t, al, ar;
if ((al = a[lb]) <= (ar = a[rb])) {
lb++; t = al;
}
else {
rb++; t = ar;
}
w[k++] = t;
}
if (rb < rf)
System.arraycopy(a, rb, w, k, rf - rb);
else if (lb < lf)
System.arraycopy(a, lb, w, k, lf - lb);
tryComplete();
}
}
} // FJShort
/** int support class */
static final class FJInt {
static final class Sorter extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final int[] a, w;
final int base, size, wbase, gran;
Sorter(CountedCompleter<?> par, int[] a, int[] w, int base,
int size, int wbase, int gran) {
super(par);
this.a = a; this.w = w; this.base = base; this.size = size;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
CountedCompleter<?> s = this;
int[] a = this.a, w = this.w; // localize all params
int b = this.base, n = this.size, wb = this.wbase, g = this.gran;
while (n > g) {
int h = n >>> 1, q = h >>> 1, u = h + q; // quartiles
Relay fc = new Relay(new Merger(s, w, a, wb, h,
wb+h, n-h, b, g));
Relay rc = new Relay(new Merger(fc, a, w, b+h, q,
b+u, n-u, wb+h, g));
new Sorter(rc, a, w, b+u, n-u, wb+u, g).fork();
new Sorter(rc, a, w, b+h, q, wb+h, g).fork();;
Relay bc = new Relay(new Merger(fc, a, w, b, q,
b+q, h-q, wb, g));
new Sorter(bc, a, w, b+q, h-q, wb+q, g).fork();
s = new EmptyCompleter(bc);
n = q;
}
DualPivotQuicksort.sort(a, b, b + n - 1, w, wb, n);
s.tryComplete();
}
}
static final class Merger extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final int[] a, w; // main and workspace arrays
final int lbase, lsize, rbase, rsize, wbase, gran;
Merger(CountedCompleter<?> par, int[] a, int[] w,
int lbase, int lsize, int rbase,
int rsize, int wbase, int gran) {
super(par);
this.a = a; this.w = w;
this.lbase = lbase; this.lsize = lsize;
this.rbase = rbase; this.rsize = rsize;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
int[] a = this.a, w = this.w; // localize all params
int lb = this.lbase, ln = this.lsize, rb = this.rbase,
rn = this.rsize, k = this.wbase, g = this.gran;
if (a == null || w == null || lb < 0 || rb < 0 || k < 0)
throw new IllegalStateException(); // hoist checks
for (int lh, rh;;) { // split larger, find point in smaller
if (ln >= rn) {
if (ln <= g)
break;
rh = rn;
int split = a[(lh = ln >>> 1) + lb];
for (int lo = 0; lo < rh; ) {
int rm = (lo + rh) >>> 1;
if (split <= a[rm + rb])
rh = rm;
else
lo = rm + 1;
}
}
else {
if (rn <= g)
break;
lh = ln;
int split = a[(rh = rn >>> 1) + rb];
for (int lo = 0; lo < lh; ) {
int lm = (lo + lh) >>> 1;
if (split <= a[lm + lb])
lh = lm;
else
lo = lm + 1;
}
}
Merger m = new Merger(this, a, w, lb + lh, ln - lh,
rb + rh, rn - rh,
k + lh + rh, g);
rn = rh;
ln = lh;
addToPendingCount(1);
m.fork();
}
int lf = lb + ln, rf = rb + rn; // index bounds
while (lb < lf && rb < rf) {
int t, al, ar;
if ((al = a[lb]) <= (ar = a[rb])) {
lb++; t = al;
}
else {
rb++; t = ar;
}
w[k++] = t;
}
if (rb < rf)
System.arraycopy(a, rb, w, k, rf - rb);
else if (lb < lf)
System.arraycopy(a, lb, w, k, lf - lb);
tryComplete();
}
}
} // FJInt
/** long support class */
static final class FJLong {
static final class Sorter extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final long[] a, w;
final int base, size, wbase, gran;
Sorter(CountedCompleter<?> par, long[] a, long[] w, int base,
int size, int wbase, int gran) {
super(par);
this.a = a; this.w = w; this.base = base; this.size = size;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
CountedCompleter<?> s = this;
long[] a = this.a, w = this.w; // localize all params
int b = this.base, n = this.size, wb = this.wbase, g = this.gran;
while (n > g) {
int h = n >>> 1, q = h >>> 1, u = h + q; // quartiles
Relay fc = new Relay(new Merger(s, w, a, wb, h,
wb+h, n-h, b, g));
Relay rc = new Relay(new Merger(fc, a, w, b+h, q,
b+u, n-u, wb+h, g));
new Sorter(rc, a, w, b+u, n-u, wb+u, g).fork();
new Sorter(rc, a, w, b+h, q, wb+h, g).fork();;
Relay bc = new Relay(new Merger(fc, a, w, b, q,
b+q, h-q, wb, g));
new Sorter(bc, a, w, b+q, h-q, wb+q, g).fork();
s = new EmptyCompleter(bc);
n = q;
}
DualPivotQuicksort.sort(a, b, b + n - 1, w, wb, n);
s.tryComplete();
}
}
static final class Merger extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final long[] a, w; // main and workspace arrays
final int lbase, lsize, rbase, rsize, wbase, gran;
Merger(CountedCompleter<?> par, long[] a, long[] w,
int lbase, int lsize, int rbase,
int rsize, int wbase, int gran) {
super(par);
this.a = a; this.w = w;
this.lbase = lbase; this.lsize = lsize;
this.rbase = rbase; this.rsize = rsize;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
long[] a = this.a, w = this.w; // localize all params
int lb = this.lbase, ln = this.lsize, rb = this.rbase,
rn = this.rsize, k = this.wbase, g = this.gran;
if (a == null || w == null || lb < 0 || rb < 0 || k < 0)
throw new IllegalStateException(); // hoist checks
for (int lh, rh;;) { // split larger, find point in smaller
if (ln >= rn) {
if (ln <= g)
break;
rh = rn;
long split = a[(lh = ln >>> 1) + lb];
for (int lo = 0; lo < rh; ) {
int rm = (lo + rh) >>> 1;
if (split <= a[rm + rb])
rh = rm;
else
lo = rm + 1;
}
}
else {
if (rn <= g)
break;
lh = ln;
long split = a[(rh = rn >>> 1) + rb];
for (int lo = 0; lo < lh; ) {
int lm = (lo + lh) >>> 1;
if (split <= a[lm + lb])
lh = lm;
else
lo = lm + 1;
}
}
Merger m = new Merger(this, a, w, lb + lh, ln - lh,
rb + rh, rn - rh,
k + lh + rh, g);
rn = rh;
ln = lh;
addToPendingCount(1);
m.fork();
}
int lf = lb + ln, rf = rb + rn; // index bounds
while (lb < lf && rb < rf) {
long t, al, ar;
if ((al = a[lb]) <= (ar = a[rb])) {
lb++; t = al;
}
else {
rb++; t = ar;
}
w[k++] = t;
}
if (rb < rf)
System.arraycopy(a, rb, w, k, rf - rb);
else if (lb < lf)
System.arraycopy(a, lb, w, k, lf - lb);
tryComplete();
}
}
} // FJLong
/** float support class */
static final class FJFloat {
static final class Sorter extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final float[] a, w;
final int base, size, wbase, gran;
Sorter(CountedCompleter<?> par, float[] a, float[] w, int base,
int size, int wbase, int gran) {
super(par);
this.a = a; this.w = w; this.base = base; this.size = size;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
CountedCompleter<?> s = this;
float[] a = this.a, w = this.w; // localize all params
int b = this.base, n = this.size, wb = this.wbase, g = this.gran;
while (n > g) {
int h = n >>> 1, q = h >>> 1, u = h + q; // quartiles
Relay fc = new Relay(new Merger(s, w, a, wb, h,
wb+h, n-h, b, g));
Relay rc = new Relay(new Merger(fc, a, w, b+h, q,
b+u, n-u, wb+h, g));
new Sorter(rc, a, w, b+u, n-u, wb+u, g).fork();
new Sorter(rc, a, w, b+h, q, wb+h, g).fork();;
Relay bc = new Relay(new Merger(fc, a, w, b, q,
b+q, h-q, wb, g));
new Sorter(bc, a, w, b+q, h-q, wb+q, g).fork();
s = new EmptyCompleter(bc);
n = q;
}
DualPivotQuicksort.sort(a, b, b + n - 1, w, wb, n);
s.tryComplete();
}
}
static final class Merger extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final float[] a, w; // main and workspace arrays
final int lbase, lsize, rbase, rsize, wbase, gran;
Merger(CountedCompleter<?> par, float[] a, float[] w,
int lbase, int lsize, int rbase,
int rsize, int wbase, int gran) {
super(par);
this.a = a; this.w = w;
this.lbase = lbase; this.lsize = lsize;
this.rbase = rbase; this.rsize = rsize;
this.wbase = wbase; this.gran = gran;
}
public final void compute() {
float[] a = this.a, w = this.w; // localize all params
int lb = this.lbase, ln = this.lsize, rb = this.rbase,
rn = this.rsize, k = this.wbase, g = this.gran;
if (a == null || w == null || lb < 0 || rb < 0 || k < 0)
throw new IllegalStateException(); // hoist checks
for (int lh, rh;;) { // split larger, find point in smaller
if (ln >= rn) {
if (ln <= g)
break;
rh = rn;
float split = a[(lh = ln >>> 1) + lb];
for (int lo = 0; lo < rh; ) {
int rm = (lo + rh) >>> 1;
if (split <= a[rm + rb])
rh = rm;
else
lo = rm + 1;
}
}
else {
if (rn <= g)
break;
lh = ln;
float split = a[(rh = rn >>> 1) + rb];
for (int lo = 0; lo < lh; ) {
int lm = (lo + lh) >>> 1;
if (split <= a[lm + lb])
lh = lm;
else
lo = lm + 1;
}
}
Merger m = new Merger(this, a, w, lb + lh, ln - lh,
rb + rh, rn - rh,
k + lh + rh, g);
rn = rh;
ln = lh;
addToPendingCount(1);
m.fork();
}
int lf = lb + ln, rf = rb + rn; // index bounds
while (lb < lf && rb < rf) {
float t, al, ar;
if ((al = a[lb]) <= (ar = a[rb])) {
lb++; t = al;
}
else {
rb++; t = ar;
}
w[k++] = t;
}
if (rb < rf)
System.arraycopy(a, rb, w, k, rf - rb);
else if (lb < lf)
System.arraycopy(a, lb, w, k, lf - lb);
tryComplete();
}
}
} // FJFloat
/** double support class */
static final class FJDouble {
static final class Sorter extends CountedCompleter<Void> {
static final long serialVersionUID = 2446542900576103244L;
final double[] a, w;
final int base, size, wbase, gran;
Sorter(CountedCompleter<?> par, double[] a, double[] w, int base,
int size, int wbase, int gran) {
super(par);
/**代码未完, 请加载全部代码(NowJava.com).**/
关注时代Java
关注时代Java