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Category.java
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Category.java
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/***
Copyright (c) 2017 CommonsWare, LLC
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.
Covered in detail in the book _Android's Architecture Components_
https://commonsware.com/AndroidArch
*/
package com.commonsware.android.room.dao;
import android.arch.persistence.room.Entity;
import android.arch.persistence.room.ForeignKey;
import android.arch.persistence.room.Ignore;
import android.arch.persistence.room.Index;
import android.arch.persistence.room.PrimaryKey;
import android.support.annotation.NonNull;
import java.util.UUID;
import static android.arch.persistence.room.ForeignKey.CASCADE;
@Entity(
tableName="categories",
foreignKeys=@ForeignKey(
entity=Category.class,
parentColumns="id",
childColumns="parentId",
onDelete=CASCADE),
indices=@Index(value="parentId"))
class Category {
@PrimaryKey
@NonNull
public final String id;
public final String title;
public final String parentId;
@Ignore
Category(String title) {
this(title, null);
}
@Ignore
public Category(String title, String parentId) {
this(UUID.randomUUID().toString(), title, parentId);
}
public Category(@NonNull String id, String title, String parentId) {
this.id=id;
this.title=title;
this.parentId=parentId;
}
}