Source code

001/**
002 *
003 * Copyright 2019-2020 Florian Schmaus.
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smack.util;
018
019public final class EqualsUtil {
020
021    private EqualsUtil() {
022    }
023
024    public static <T> boolean equals(T thisObject, Object other, EqualsComperator<T> equalsComperator) {
025        if (other == null) {
026            return false;
027        }
028        if (thisObject == other) {
029            return true;
030        }
031        @SuppressWarnings("unchecked")
032        Class<T> thisObjectClass = (Class<T>) thisObject.getClass();
033        if (thisObjectClass != other.getClass()) {
034            return false;
035        }
036
037        int thisHashCode = thisObject.hashCode();
038        int otherHashCode = other.hashCode();
039        if (thisHashCode != otherHashCode) {
040            return false;
041        }
042
043        EqualsUtil.Builder equalsBuilder = new EqualsUtil.Builder();
044
045        equalsComperator.compare(equalsBuilder, thisObjectClass.cast(other));
046
047        return equalsBuilder.isEquals;
048    }
049
050    @FunctionalInterface
051    public interface EqualsComperator<T> {
052        void compare(EqualsUtil.Builder equalsBuilder, T other);
053    }
054
055    public static final class Builder {
056        private boolean isEquals = true;
057
058        private Builder() {
059        }
060
061        private void nullSafeCompare(Object left, Object right, Runnable runnable) {
062            if (!isEquals) {
063                return;
064            }
065
066            if (left == right) {
067                return;
068            }
069
070            if (left == null || right == null) {
071                isEquals = false;
072                return;
073            }
074
075            runnable.run();
076        }
077
078        public <O> Builder append(O left, O right) {
079            if (!isEquals) {
080                return this;
081            }
082
083            if (left == right) {
084                return this;
085            }
086
087            if (left == null || right == null) {
088                isEquals = false;
089                return this;
090            }
091
092            isEquals = left.equals(right);
093            return this;
094        }
095
096        public Builder append(boolean left, boolean right) {
097            if (!isEquals) {
098                return this;
099            }
100
101            isEquals = left == right;
102            return this;
103        }
104
105        public Builder append(boolean[] left, boolean[] right) {
106            nullSafeCompare(left, right, () -> {
107                if (left.length != right.length) {
108                    isEquals = false;
109                    return;
110                }
111                for (int i = 0; i < left.length && isEquals; i++) {
112                    append(left[i], right[i]);
113                }
114            });
115            return this;
116        }
117
118        public Builder append(byte left, byte right) {
119            if (!isEquals) {
120                return this;
121            }
122
123            isEquals = left == right;
124            return this;
125        }
126
127        public Builder append(byte[] left, byte[] right) {
128            nullSafeCompare(left, right, () -> {
129                if (left.length != right.length) {
130                    isEquals = false;
131                    return;
132                }
133                for (int i = 0; i < left.length && isEquals; i++) {
134                    append(left[i], right[i]);
135                }
136            });
137            return this;
138        }
139
140        public Builder append(char left, char right) {
141            if (!isEquals) {
142                return this;
143            }
144
145            isEquals = left == right;
146            return this;
147        }
148
149        public Builder append(char[] left, char[] right) {
150            nullSafeCompare(left, right, () -> {
151                if (left.length != right.length) {
152                    isEquals = false;
153                    return;
154                }
155                for (int i = 0; i < left.length && isEquals; i++) {
156                    append(left[i], right[i]);
157                }
158            });
159            return this;
160        }
161
162        public Builder append(double left, double right) {
163            if (!isEquals) {
164                return this;
165            }
166
167            return append(Double.doubleToLongBits(left), Double.doubleToLongBits(right));
168        }
169
170        public Builder append(double[] left, double[] right) {
171            nullSafeCompare(left, right, () -> {
172                if (left.length != right.length) {
173                    isEquals = false;
174                    return;
175                }
176                for (int i = 0; i < left.length && isEquals; i++) {
177                    append(left[i], right[i]);
178                }
179            });
180            return this;
181        }
182
183        public Builder append(float left, float right) {
184            if (!isEquals) {
185                return this;
186            }
187
188            return append(Float.floatToIntBits(left), Float.floatToIntBits(right));
189        }
190
191        public Builder append(float[] left, float[] right) {
192            nullSafeCompare(left, right, () -> {
193                if (left.length != right.length) {
194                    isEquals = false;
195                    return;
196                }
197                for (int i = 0; i < left.length && isEquals; i++) {
198                    append(left[i], right[i]);
199                }
200            });
201            return this;
202        }
203
204        public Builder append(int left, int right) {
205            if (!isEquals) {
206                return this;
207            }
208
209            isEquals = left == right;
210            return this;
211        }
212
213        public Builder append(int[] left, int[] right) {
214            nullSafeCompare(left, right, () -> {
215                if (left.length != right.length) {
216                    isEquals = false;
217                    return;
218                }
219                for (int i = 0; i < left.length && isEquals; i++) {
220                    append(left[i], right[i]);
221                }
222            });
223            return this;
224        }
225
226        public Builder append(long left, long right) {
227            if (!isEquals) {
228                return this;
229            }
230
231            isEquals = left == right;
232            return this;
233        }
234
235        public Builder append(long[] left, long[] right) {
236            nullSafeCompare(left, right, () -> {
237                if (left.length != right.length) {
238                    isEquals = false;
239                    return;
240                }
241                for (int i = 0; i < left.length && isEquals; i++) {
242                    append(left[i], right[i]);
243                }
244            });
245            return this;
246        }
247    }
248
249}