+++ /dev/null
-/*
- * Copyright 2004-2010 Brian S O'Neill
- *
- * 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 org.cojen.util;
-
-import java.util.Arrays;
-
-/**
- * KeyFactory generates keys which can be hashed or compared for any kind of
- * object including arrays, arrays of arrays, and null. All hashcode
- * computations, equality tests, and ordering comparsisons fully recurse into
- * arrays.
- *
- * @author Brian S O'Neill
- */
-@SuppressWarnings({ "rawtypes", "unused", "unchecked", "serial" })
-public class KeyFactory {
- static final Object NULL = new Comparable() {
- public int compareTo(Object obj) {
- return obj == this || obj == null ? 0 : 1;
- }
- };
-
- public static Object createKey(boolean[] obj) {
- return obj == null ? NULL : new BooleanArrayKey(obj);
- }
-
- public static Object createKey(byte[] obj) {
- return obj == null ? NULL : new ByteArrayKey(obj);
- }
-
- public static Object createKey(char[] obj) {
- return obj == null ? NULL : new CharArrayKey(obj);
- }
-
- public static Object createKey(double[] obj) {
- return obj == null ? NULL : new DoubleArrayKey(obj);
- }
-
- public static Object createKey(float[] obj) {
- return obj == null ? NULL : new FloatArrayKey(obj);
- }
-
- public static Object createKey(int[] obj) {
- return obj == null ? NULL : new IntArrayKey(obj);
- }
-
- public static Object createKey(long[] obj) {
- return obj == null ? NULL : new LongArrayKey(obj);
- }
-
- public static Object createKey(short[] obj) {
- return obj == null ? NULL : new ShortArrayKey(obj);
- }
-
- public static Object createKey(Object[] obj) {
- return obj == null ? NULL : new ObjectArrayKey(obj);
- }
-
- public static Object createKey(Object obj) {
- if (obj == null) {
- return NULL;
- }
- if (!obj.getClass().isArray()) {
- return obj;
- }
- if (obj instanceof Object[]) {
- return createKey((Object[])obj);
- } else if (obj instanceof int[]) {
- return createKey((int[])obj);
- } else if (obj instanceof float[]) {
- return createKey((float[])obj);
- } else if (obj instanceof long[]) {
- return createKey((long[])obj);
- } else if (obj instanceof double[]) {
- return createKey((double[])obj);
- } else if (obj instanceof byte[]) {
- return createKey((byte[])obj);
- } else if (obj instanceof char[]) {
- return createKey((char[])obj);
- } else if (obj instanceof boolean[]) {
- return createKey((boolean[])obj);
- } else if (obj instanceof short[]) {
- return createKey((short[])obj);
- } else {
- return obj;
- }
- }
-
- static int hashCode(boolean[] a) {
- int hash = 0;
- for (int i = a.length; --i >= 0; ) {
- hash = (hash << 1) + (a[i] ? 0 : 1);
- }
- return hash == 0 ? -1 : hash;
- }
-
- static int hashCode(byte[] a) {
- int hash = 0;
- for (int i = a.length; --i >= 0; ) {
- hash = (hash << 1) + a[i];
- }
- return hash == 0 ? -1 : hash;
- }
-
- static int hashCode(char[] a) {
- int hash = 0;
- for (int i = a.length; --i >= 0; ) {
- hash = (hash << 1) + a[i];
- }
- return hash == 0 ? -1 : hash;
- }
-
- static int hashCode(double[] a) {
- int hash = 0;
- for (int i = a.length; --i >= 0; ) {
- long v = Double.doubleToLongBits(a[i]);
- hash = hash * 31 + (int)(v ^ v >>> 32);
- }
- return hash == 0 ? -1 : hash;
- }
-
- static int hashCode(float[] a) {
- int hash = 0;
- for (int i = a.length; --i >= 0; ) {
- hash = hash * 31 + Float.floatToIntBits(a[i]);
- }
- return hash == 0 ? -1 : hash;
- }
-
- static int hashCode(int[] a) {
- int hash = 0;
- for (int i = a.length; --i >= 0; ) {
- hash = (hash << 1) + a[i];
- }
- return hash == 0 ? -1 : hash;
- }
-
- static int hashCode(long[] a) {
- int hash = 0;
- for (int i = a.length; --i >= 0; ) {
- long v = a[i];
- hash = hash * 31 + (int)(v ^ v >>> 32);
- }
- return hash == 0 ? -1 : hash;
- }
-
- static int hashCode(short[] a) {
- int hash = 0;
- for (int i = a.length; --i >= 0; ) {
- hash = (hash << 1) + a[i];
- }
- return hash == 0 ? -1 : hash;
- }
-
- static int hashCode(Object[] a) {
- int hash = 0;
- for (int i = a.length; --i >= 0; ) {
- hash = hash * 31 + hashCode(a[i]);
- }
- return hash == 0 ? -1 : hash;
- }
-
- // Compute object or array hashcode and recurses into arrays within.
- static int hashCode(Object a) {
- if (a == null) {
- return -1;
- }
- if (!a.getClass().isArray()) {
- return a.hashCode();
- }
- if (a instanceof Object[]) {
- return hashCode((Object[])a);
- } else if (a instanceof int[]) {
- return hashCode((int[])a);
- } else if (a instanceof float[]) {
- return hashCode((float[])a);
- } else if (a instanceof long[]) {
- return hashCode((long[])a);
- } else if (a instanceof double[]) {
- return hashCode((double[])a);
- } else if (a instanceof byte[]) {
- return hashCode((byte[])a);
- } else if (a instanceof char[]) {
- return hashCode((char[])a);
- } else if (a instanceof boolean[]) {
- return hashCode((boolean[])a);
- } else if (a instanceof short[]) {
- return hashCode((short[])a);
- } else {
- int hash = a.getClass().hashCode();
- return hash == 0 ? -1 : hash;
- }
- }
-
- // Compares object arrays and recurses into arrays within.
- static boolean equals(Object[] a, Object[] b) {
- if (a == b) {
- return true;
- }
- if (a == null || b == null) {
- return false;
- }
- int i;
- if ((i = a.length) != b.length) {
- return false;
- }
- while (--i >= 0) {
- if (!equals(a[i], b[i])) {
- return false;
- }
- }
- return true;
- }
-
- // Compares objects or arrays and recurses into arrays within.
- static boolean equals(Object a, Object b) {
- if (a == b) {
- return true;
- }
- if (a == null || b == null) {
- return false;
- }
- Class ac = a.getClass();
- if (!(ac.isArray())) {
- return a.equals(b);
- }
- if (ac != b.getClass()) {
- return false;
- }
- if (a instanceof Object[]) {
- return equals((Object[])a, (Object[])b);
- } else if (a instanceof int[]) {
- return Arrays.equals((int[])a, (int[])b);
- } else if (a instanceof float[]) {
- return Arrays.equals((float[])a, (float[])b);
- } else if (a instanceof long[]) {
- return Arrays.equals((long[])a, (long[])b);
- } else if (a instanceof double[]) {
- return Arrays.equals((double[])a, (double[])b);
- } else if (a instanceof byte[]) {
- return Arrays.equals((byte[])a, (byte[])b);
- } else if (a instanceof char[]) {
- return Arrays.equals((char[])a, (char[])b);
- } else if (a instanceof boolean[]) {
- return Arrays.equals((boolean[])a, (boolean[])b);
- } else if (a instanceof short[]) {
- return Arrays.equals((short[])a, (short[])b);
- } else {
- return a.equals(b);
- }
- }
-
- static int compare(boolean[] a, boolean[] b) {
- if (a == b) {
- return 0;
- }
- if (a == null) {
- return 1;
- }
- if (b == null) {
- return -1;
- }
- int length = Math.min(a.length, b.length);
- for (int i=0; i<length; i++) {
- int av = a[i] ? 0 : 1;
- int bv = b[i] ? 0 : 1;
- return av < bv ? -1 : (av > bv ? 1 : 0);
- }
- return a.length < b.length ? -1 : (a.length > b.length ? 1 : 0);
- }
-
- static int compare(byte[] a, byte[] b) {
- if (a == b) {
- return 0;
- }
- if (a == null) {
- return 1;
- }
- if (b == null) {
- return -1;
- }
- int length = Math.min(a.length, b.length);
- for (int i=0; i<length; i++) {
- byte av = a[i];
- byte bv = b[i];
- return av < bv ? -1 : (av > bv ? 1 : 0);
- }
- return a.length < b.length ? -1 : (a.length > b.length ? 1 : 0);
- }
-
- static int compare(char[] a, char[] b) {
- if (a == b) {
- return 0;
- }
- if (a == null) {
- return 1;
- }
- if (b == null) {
- return -1;
- }
- int length = Math.min(a.length, b.length);
- for (int i=0; i<length; i++) {
- char av = a[i];
- char bv = b[i];
- return av < bv ? -1 : (av > bv ? 1 : 0);
- }
- return a.length < b.length ? -1 : (a.length > b.length ? 1 : 0);
- }
-
- static int compare(double[] a, double[] b) {
- if (a == b) {
- return 0;
- }
- if (a == null) {
- return 1;
- }
- if (b == null) {
- return -1;
- }
- int length = Math.min(a.length, b.length);
- for (int i=0; i<length; i++) {
- int v = Double.compare(a[i], b[i]);
- if (v != 0) {
- return v;
- }
- }
- return a.length < b.length ? -1 : (a.length > b.length ? 1 : 0);
- }
-
- static int compare(float[] a, float[] b) {
- if (a == b) {
- return 0;
- }
- if (a == null) {
- return 1;
- }
- if (b == null) {
- return -1;
- }
- int length = Math.min(a.length, b.length);
- for (int i=0; i<length; i++) {
- int v = Float.compare(a[i], b[i]);
- if (v != 0) {
- return v;
- }
- }
- return a.length < b.length ? -1 : (a.length > b.length ? 1 : 0);
- }
-
- static int compare(int[] a, int[] b) {
- if (a == b) {
- return 0;
- }
- if (a == null) {
- return 1;
- }
- if (b == null) {
- return -1;
- }
- int length = Math.min(a.length, b.length);
- for (int i=0; i<length; i++) {
- int av = a[i];
- int bv = b[i];
- return av < bv ? -1 : (av > bv ? 1 : 0);
- }
- return a.length < b.length ? -1 : (a.length > b.length ? 1 : 0);
- }
-
- static int compare(long[] a, long[] b) {
- if (a == b) {
- return 0;
- }
- if (a == null) {
- return 1;
- }
- if (b == null) {
- return -1;
- }
- int length = Math.min(a.length, b.length);
- for (int i=0; i<length; i++) {
- long av = a[i];
- long bv = b[i];
- return av < bv ? -1 : (av > bv ? 1 : 0);
- }
- return a.length < b.length ? -1 : (a.length > b.length ? 1 : 0);
- }
-
- static int compare(short[] a, short[] b) {
- if (a == b) {
- return 0;
- }
- if (a == null) {
- return 1;
- }
- if (b == null) {
- return -1;
- }
- int length = Math.min(a.length, b.length);
- for (int i=0; i<length; i++) {
- short av = a[i];
- short bv = b[i];
- return av < bv ? -1 : (av > bv ? 1 : 0);
- }
- return a.length < b.length ? -1 : (a.length > b.length ? 1 : 0);
- }
-
- // Compares object arrays and recurses into arrays within.
- static int compare(Object[] a, Object[] b) {
- if (a == b) {
- return 0;
- }
- if (a == null) {
- return 1;
- }
- if (b == null) {
- return -1;
- }
- int length = Math.min(a.length, b.length);
- for (int i=0; i<length; i++) {
- int v = compare(a[i], b[i]);
- if (v != 0) {
- return v;
- }
- }
- return a.length < b.length ? -1 : (a.length > b.length ? 1 : 0);
- }
-
- // Compares objects or arrays and recurses into arrays within.
- static int compare(Object a, Object b) {
- if (a == b) {
- return 0;
- }
- if (a == null) {
- return 1;
- }
- if (b == null) {
- return -1;
- }
- Class ac = a.getClass();
- if (!(ac.isArray())) {
- return ((Comparable)a).compareTo(b);
- }
- if (ac != b.getClass()) {
- throw new ClassCastException();
- }
- if (a instanceof Object[]) {
- return compare((Object[])a, (Object[])b);
- } else if (a instanceof int[]) {
- return compare((int[])a, (int[])b);
- } else if (a instanceof float[]) {
- return compare((float[])a, (float[])b);
- } else if (a instanceof long[]) {
- return compare((long[])a, (long[])b);
- } else if (a instanceof double[]) {
- return compare((double[])a, (double[])b);
- } else if (a instanceof byte[]) {
- return compare((byte[])a, (byte[])b);
- } else if (a instanceof char[]) {
- return compare((char[])a, (char[])b);
- } else if (a instanceof boolean[]) {
- return compare((boolean[])a, (boolean[])b);
- } else if (a instanceof short[]) {
- return compare((short[])a, (short[])b);
- } else {
- throw new ClassCastException();
- }
- }
-
- protected KeyFactory() {
- }
-
- private static interface ArrayKey extends Comparable, java.io.Serializable {
- int hashCode();
-
- boolean equals(Object obj);
-
- int compareTo(Object obj);
- }
-
- private static class BooleanArrayKey implements ArrayKey {
- protected final boolean[] mArray;
- private transient int mHash;
-
- BooleanArrayKey(boolean[] array) {
- mArray = array;
- }
-
- public int hashCode() {
- int hash = mHash;
- return hash == 0 ? mHash = KeyFactory.hashCode(mArray) : hash;
- }
-
- public boolean equals(Object obj) {
- return this == obj ? true :
- (obj instanceof BooleanArrayKey ?
- Arrays.equals(mArray, ((BooleanArrayKey) obj).mArray) : false);
- }
-
- public int compareTo(Object obj) {
- return compare(mArray, ((BooleanArrayKey) obj).mArray);
- }
- }
-
- private static class ByteArrayKey implements ArrayKey {
- protected final byte[] mArray;
- private transient int mHash;
-
- ByteArrayKey(byte[] array) {
- mArray = array;
- }
-
- public int hashCode() {
- int hash = mHash;
- return hash == 0 ? mHash = KeyFactory.hashCode(mArray) : hash;
- }
-
- public boolean equals(Object obj) {
- return this == obj ? true :
- (obj instanceof ByteArrayKey ?
- Arrays.equals(mArray, ((ByteArrayKey) obj).mArray) : false);
- }
-
- public int compareTo(Object obj) {
- return compare(mArray, ((ByteArrayKey) obj).mArray);
- }
- }
-
- private static class CharArrayKey implements ArrayKey {
- protected final char[] mArray;
- private transient int mHash;
-
- CharArrayKey(char[] array) {
- mArray = array;
- }
-
- public int hashCode() {
- int hash = mHash;
- return hash == 0 ? mHash = KeyFactory.hashCode(mArray) : hash;
- }
-
- public boolean equals(Object obj) {
- return this == obj ? true :
- (obj instanceof CharArrayKey ?
- Arrays.equals(mArray, ((CharArrayKey) obj).mArray) : false);
- }
-
- public int compareTo(Object obj) {
- return compare(mArray, ((CharArrayKey) obj).mArray);
- }
- }
-
- private static class DoubleArrayKey implements ArrayKey {
- protected final double[] mArray;
- private transient int mHash;
-
- DoubleArrayKey(double[] array) {
- mArray = array;
- }
-
- public int hashCode() {
- int hash = mHash;
- return hash == 0 ? mHash = KeyFactory.hashCode(mArray) : hash;
- }
-
- public boolean equals(Object obj) {
- return this == obj ? true :
- (obj instanceof DoubleArrayKey ?
- Arrays.equals(mArray, ((DoubleArrayKey) obj).mArray) : false);
- }
-
- public int compareTo(Object obj) {
- return compare(mArray, ((DoubleArrayKey) obj).mArray);
- }
- }
-
- private static class FloatArrayKey implements ArrayKey {
- protected final float[] mArray;
- private transient int mHash;
-
- FloatArrayKey(float[] array) {
- mArray = array;
- }
-
- public int hashCode() {
- int hash = mHash;
- return hash == 0 ? mHash = KeyFactory.hashCode(mArray) : hash;
- }
-
- public boolean equals(Object obj) {
- return this == obj ? true :
- (obj instanceof FloatArrayKey ?
- Arrays.equals(mArray, ((FloatArrayKey) obj).mArray) : false);
- }
-
- public int compareTo(Object obj) {
- return compare(mArray, ((FloatArrayKey) obj).mArray);
- }
- }
-
- private static class IntArrayKey implements ArrayKey {
- protected final int[] mArray;
- private transient int mHash;
-
- IntArrayKey(int[] array) {
- mArray = array;
- }
-
- public int hashCode() {
- int hash = mHash;
- return hash == 0 ? mHash = KeyFactory.hashCode(mArray) : hash;
- }
-
- public boolean equals(Object obj) {
- return this == obj ? true :
- (obj instanceof IntArrayKey ?
- Arrays.equals(mArray, ((IntArrayKey) obj).mArray) : false);
- }
-
- public int compareTo(Object obj) {
- return compare(mArray, ((IntArrayKey) obj).mArray);
- }
- }
-
- private static class LongArrayKey implements ArrayKey {
- protected final long[] mArray;
- private transient int mHash;
-
- LongArrayKey(long[] array) {
- mArray = array;
- }
-
- public int hashCode() {
- int hash = mHash;
- return hash == 0 ? mHash = KeyFactory.hashCode(mArray) : hash;
- }
-
- public boolean equals(Object obj) {
- return this == obj ? true :
- (obj instanceof LongArrayKey ?
- Arrays.equals(mArray, ((LongArrayKey) obj).mArray) : false);
- }
-
- public int compareTo(Object obj) {
- return compare(mArray, ((LongArrayKey) obj).mArray);
- }
- }
-
- private static class ShortArrayKey implements ArrayKey {
- protected final short[] mArray;
- private transient int mHash;
-
- ShortArrayKey(short[] array) {
- mArray = array;
- }
-
- public int hashCode() {
- int hash = mHash;
- return hash == 0 ? mHash = KeyFactory.hashCode(mArray) : hash;
- }
-
- public boolean equals(Object obj) {
- return this == obj ? true :
- (obj instanceof ShortArrayKey ?
- Arrays.equals(mArray, ((ShortArrayKey) obj).mArray) : false);
- }
-
- public int compareTo(Object obj) {
- return compare(mArray, ((ShortArrayKey) obj).mArray);
- }
- }
-
- private static class ObjectArrayKey implements ArrayKey {
- protected final Object[] mArray;
- private transient int mHash;
-
- ObjectArrayKey(Object[] array) {
- mArray = array;
- }
-
- public int hashCode() {
- int hash = mHash;
- return hash == 0 ? mHash = KeyFactory.hashCode(mArray) : hash;
- }
-
- public boolean equals(Object obj) {
- return this == obj ? true :
- (obj instanceof ObjectArrayKey ?
- KeyFactory.equals(mArray, ((ObjectArrayKey) obj).mArray) : false);
- }
-
- public int compareTo(Object obj) {
- return compare(mArray, ((ObjectArrayKey) obj).mArray);
- }
- }
-}
Code Review / simantics / platform.git / blobdiff