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248 lines
9.4 KiB
248 lines
9.4 KiB
// kelondroNaturalOrder.java
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// -----------------------
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// part of The Kelondro Database
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2005
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// created 29.12.2005
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//
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// $LastChangedDate: 2005-09-22 22:01:26 +0200 (Thu, 22 Sep 2005) $
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// $LastChangedRevision: 774 $
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// $LastChangedBy: orbiter $
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.kelondro.order;
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import java.util.Comparator;
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public final class NaturalOrder extends AbstractOrder<byte[]> implements ByteOrder, Comparator<byte[]>, Cloneable {
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public static final ByteOrder naturalOrder = new NaturalOrder(true);
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public static final Comparator<String> naturalComparator = new ByteOrder.StringOrder(naturalOrder);
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public NaturalOrder(final boolean ascending) {
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this.asc = ascending;
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this.zero = null;
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}
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public boolean wellformed(final byte[] a) {
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return true;
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}
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public boolean wellformed(final byte[] a, final int astart, final int alength) {
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return true;
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}
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public final Order<byte[]> clone() {
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final NaturalOrder o = new NaturalOrder(this.asc);
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o.rotate(this.zero);
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return o;
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}
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public static ByteOrder orderBySignature(final String signature) {
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ByteOrder oo = null;
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if (oo == null) oo = NaturalOrder.bySignature(signature);
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if (oo == null) oo = Base64Order.bySignature(signature);
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if (oo == null) oo = new NaturalOrder(true);
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return oo;
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}
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public final static ByteOrder bySignature(final String signature) {
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if (signature.equals("nd")) return new NaturalOrder(false);
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if (signature.equals("nu")) return new NaturalOrder(true);
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return null;
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}
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public final String signature() {
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if (!asc) return "nd";
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if ( asc) return "nu";
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return null;
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}
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/*
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private final static long cardinalI(final byte[] key) {
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// returns a cardinal number in the range of 0 .. Long.MAX_VALUE
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long c = 0;
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int p = 0;
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while ((p < 8) && (p < key.length)) c = (c << 8) | ((long) key[p++] & 0xFF);
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while (p++ < 8) c = (c << 8);
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c = c >>> 1;
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return c;
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}
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*/
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private final static long cardinalI(final byte[] key, int off, int len) {
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// returns a cardinal number in the range of 0 .. Long.MAX_VALUE
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long c = 0;
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int lim = off + Math.min(8, len);
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int lim8 = off + 8;
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while (off < lim) c = (c << 8) | ((long) key[off++] & 0xFF);
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while (off++ < lim8) c = (c << 8);
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c = c >>> 1;
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return c;
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}
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public final long cardinal(final byte[] key) {
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if (this.zero == null) return cardinalI(key, 0, key.length);
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final long zeroCardinal = cardinalI(this.zero, 0, this.zero.length);
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final long keyCardinal = cardinalI(key, 0, key.length);
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if (keyCardinal > zeroCardinal) return keyCardinal - zeroCardinal;
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return Long.MAX_VALUE - keyCardinal + zeroCardinal;
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}
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public long cardinal(final byte[] key, int off, int len) {
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if (this.zero == null) return cardinalI(key, off, len);
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final long zeroCardinal = cardinalI(this.zero, 0, this.zero.length);
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final long keyCardinal = cardinalI(key, off, len);
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if (keyCardinal > zeroCardinal) return keyCardinal - zeroCardinal;
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return Long.MAX_VALUE - keyCardinal + zeroCardinal;
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}
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public final static byte[] encodeLong(long c, int length) {
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final byte[] b = new byte[length];
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while (length > 0) {
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b[--length] = (byte) (c & 0xFF);
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c >>= 8;
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}
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return b;
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}
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public final static void encodeLong(long c, final byte[] b, final int offset, int length) {
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assert offset + length <= b.length;
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while (length > 0) {
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b[--length + offset] = (byte) (c & 0xFF);
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c >>= 8;
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}
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}
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public final static long decodeLong(final byte[] s) {
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if (s == null) return 0;
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long c = 0;
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int p = 0;
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while (p < s.length) c = (c << 8) | ((long) s[p++] & 0xFF);
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return c;
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}
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public final static long decodeLong(final byte[] s, int offset, final int length) {
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if (s == null) return 0;
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long c = 0;
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final int m = Math.min(s.length, offset + length);
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while (offset < m) c = (c << 8) | ((long) s[offset++] & 0xFF);
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return c;
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}
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private static final int sig(final int x) {
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return (x > 0) ? 1 : (x < 0) ? -1 : 0;
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}
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// Compares its two arguments for order.
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// Returns -1, 0, or 1 as the first argument
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// is less than, equal to, or greater than the second.
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// two arrays are also equal if one array is a subset of the other's array
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// with filled-up char(0)-values
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public final int compare(final byte[] a, final byte[] b) {
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return (asc) ? compare0(a, 0, a.length, b, 0, b.length) : compare0(b, 0, b.length, a, 0, a.length);
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}
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public final int compare(final byte[] a, final int aoffset, final int alength, final byte[] b, final int boffset, final int blength) {
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return (asc) ? compare0(a, aoffset, alength, b, boffset, blength) : compare0(b, boffset, blength, a, aoffset, alength);
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}
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public final int compare0(final byte[] a, final int aoffset, final int alength, final byte[] b, final int boffset, final int blength) {
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if (zero == null) return compares(a, aoffset, alength, b, boffset, blength);
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// we have an artificial start point. check all combinations
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final int az = compares(a, aoffset, alength, zero, 0, zero.length); // -1 if a < z; 0 if a == z; 1 if a > z
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final int bz = compares(b, boffset, blength, zero, 0, zero.length); // -1 if b < z; 0 if b == z; 1 if b > z
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if (az == bz) return compares(a, aoffset, alength, b, boffset, blength);
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return sig(az - bz);
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}
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public final boolean equal(final byte[] a, final byte[] b) {
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if ((a == null) && (b == null)) return true;
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if ((a == null) || (b == null)) return false;
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if (a.length != b.length) return false;
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int astart = 0;
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int bstart = 0;
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int length = a.length;
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while (length-- != 0) {
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if (a[astart++] != b[bstart++]) return false;
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}
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return true;
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}
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public final boolean equal(final byte[] a, int astart, final byte[] b, int bstart, int length) {
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if ((a == null) && (b == null)) return true;
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if ((a == null) || (b == null)) return false;
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while (length-- != 0) {
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if (a[astart++] != b[bstart++]) return false;
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}
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return true;
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}
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public static final int compares(final byte[] a, final int aoffset, final int alength, final byte[] b, final int boffset, final int blength) {
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int i = 0;
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final int al = Math.min(alength, a.length - aoffset);
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final int bl = Math.min(blength, b.length - boffset);
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int aa, bb;
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while ((i < al) && (i < bl)) {
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aa = 0xff & a[i + aoffset];
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bb = 0xff & b[i + boffset];
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if (aa > bb) return 1;
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if (aa < bb) return -1;
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// else the bytes are equal and it may go on yet undecided
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i++;
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}
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// compare length
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if (al > bl) return 1;
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if (al < bl) return -1;
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// they are equal
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return 0;
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}
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public static final String arrayList(final byte[] b, final int start, int length) {
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if (b == null) return "NULL";
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if (b.length == 0) return "[]";
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length = Math.min(length, b.length - start);
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final StringBuilder sb = new StringBuilder(b.length * 4);
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sb.append('[').append(Integer.toString(b[start])).append(',');
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for (int i = 1; i < length; i++) sb.append(' ').append(Integer.toString(b[start + i])).append(',');
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sb.append(']');
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return sb.toString();
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}
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public static final String table(final byte[] b, final int linewidth, final int marker) {
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if (b == null) return "NULL";
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if (b.length == 0) return "[]";
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final StringBuilder sb = new StringBuilder(b.length * 4);
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for (int i = 0; i < b.length; i++) {
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if (i % linewidth == 0)
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sb.append('\n').append("# ").append(Integer.toHexString(i)).append(": ");
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else
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sb.append(',');
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sb.append(' ').append(Integer.toString(0xff & b[i]));
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if (i >= 65535) break;
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}
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sb.append('\n');
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return sb.toString();
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}
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public static void main(final String[] args) {
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final byte[] t = new byte[12];
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for (int i = 0; i < 12; i++) t[i] = (byte) 255;
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t[0] = (byte) 127;
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final Order<byte[]> o = new NaturalOrder(true);
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System.out.println(o.partition(t, 16));
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}
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}
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