mirror of
https://github.com/vanitasvitae/Smack.git
synced 2024-09-27 18:19:33 +02:00
212 lines
5.4 KiB
Java
212 lines
5.4 KiB
Java
/**
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*
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* Copyright 2019 Florian Schmaus.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.util;
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public class HashCode {
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private static final int MULTIPLIER_VALUE = 37;
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public static class Cache {
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private boolean calculated;
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private int hashcode;
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public int getHashCode(Calculator hashCodeCalculator) {
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if (calculated) {
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return hashcode;
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}
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HashCode.Builder hashCodeBuilder = new HashCode.Builder();
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hashCodeCalculator.calculateHash(hashCodeBuilder);
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calculated = true;
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hashcode = hashCodeBuilder.hashcode;
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return hashcode;
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}
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}
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@FunctionalInterface
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public interface Calculator {
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void calculateHash(HashCode.Builder hashCodeBuilder);
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}
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public static Builder builder() {
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return new Builder();
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}
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public static class Builder {
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private int hashcode = 17;
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private void applyHash() {
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applyHash(0);
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}
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private void applyHash(int hash) {
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hashcode = MULTIPLIER_VALUE * hashcode + hash;
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}
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public Builder append(Object object) {
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if (object == null) {
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applyHash();
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return this;
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}
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if (object.getClass().isArray()) {
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if (object instanceof int[]) {
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append((int[]) object);
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} else if (object instanceof long[]) {
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append((long[]) object);
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} else if (object instanceof boolean[]) {
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append((boolean[]) object);
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} else if (object instanceof double[]) {
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append((double[]) object);
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} else if (object instanceof float[]) {
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append((float[]) object);
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} else if (object instanceof short[]) {
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append((short[]) object);
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} else if (object instanceof char[]) {
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append((char[]) object);
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} else if (object instanceof byte[]) {
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append((byte[]) object);
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} else {
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append((Object[]) object);
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}
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}
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applyHash(object.hashCode());
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return this;
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}
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public Builder append(boolean value) {
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applyHash(value ? 0 : 1);
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return this;
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}
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public Builder append(boolean[] array) {
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if (array == null) {
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applyHash();
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return this;
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}
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for (boolean bool : array) {
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append(bool);
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}
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return this;
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}
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public Builder append(byte value) {
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applyHash(value);
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return this;
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}
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public Builder append(byte[] array) {
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if (array == null) {
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applyHash();
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return this;
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}
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for (byte b : array) {
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append(b);
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}
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return this;
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}
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public Builder append(char value) {
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applyHash(value);
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return this;
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}
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public Builder append(char[] array) {
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if (array == null) {
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applyHash();
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return this;
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}
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for (char c : array) {
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append(c);
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}
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return this;
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}
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public Builder append(double value) {
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return append(Double.doubleToLongBits(value));
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}
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public Builder append(double[] array) {
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if (array == null) {
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applyHash();
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return this;
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}
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for (double d : array) {
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append(d);
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}
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return this;
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}
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public Builder append(float value) {
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return append(Float.floatToIntBits(value));
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}
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public Builder append(float[] array) {
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if (array == null) {
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applyHash();
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return this;
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}
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for (float f : array) {
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append(f);
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}
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return this;
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}
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public Builder append(long value) {
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applyHash((int) (value ^ (value >>> 32)));
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return this;
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}
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public Builder append(long[] array) {
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if (array == null) {
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applyHash();
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return this;
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}
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for (long l : array) {
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append(l);
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}
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return this;
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}
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public Builder append(Object[] array) {
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if (array == null) {
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applyHash();
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return this;
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}
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for (Object element : array) {
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append(element);
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}
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return this;
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}
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public int build() {
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return hashcode;
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}
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}
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}
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