1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.textclassifier.common.logging; 18 19 import com.google.common.base.Preconditions; 20 import java.util.Locale; 21 import java.util.Objects; 22 import java.util.UUID; 23 24 /** This class represents the id of a text classification session. */ 25 public final class TextClassificationSessionId { 26 private final String value; 27 28 /** Creates a new instance. */ TextClassificationSessionId()29 public TextClassificationSessionId() { 30 this(UUID.randomUUID().toString()); 31 } 32 TextClassificationSessionId(String value)33 private TextClassificationSessionId(String value) { 34 this.value = Preconditions.checkNotNull(value); 35 } 36 37 @Override toString()38 public String toString() { 39 return String.format(Locale.US, "TextClassificationSessionId {%s}", value); 40 } 41 42 @Override hashCode()43 public int hashCode() { 44 return value.hashCode(); 45 } 46 47 @Override equals(Object o)48 public boolean equals(Object o) { 49 if (this == o) { 50 return true; 51 } 52 if (o == null || getClass() != o.getClass()) { 53 return false; 54 } 55 TextClassificationSessionId that = (TextClassificationSessionId) o; 56 return Objects.equals(value, that.value); 57 } 58 59 /** 60 * Flattens this id to a string. 61 * 62 * @return The flattened id. 63 */ getValue()64 public String getValue() { 65 return value; 66 } 67 68 /** 69 * Recovers a TextClassificationSessionId from a string of the form returned by {@link 70 * #getValue()}. 71 */ unflattenFromString(String value)72 public static TextClassificationSessionId unflattenFromString(String value) { 73 return new TextClassificationSessionId(value); 74 } 75 } 76