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Track.java
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/
Track.java
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/*
* Copyright 2023 Google 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.
*/
package com.google.cloud.spanner.sample.entities;
import org.springframework.data.annotation.PersistenceCreator;
import org.springframework.data.relational.core.mapping.Column;
import org.springframework.data.relational.core.mapping.Table;
/**
* The "tracks" table is interleaved in "albums". That means that the first part of the primary key
* (the "id" column) references the Album that this Track belongs to. That again means that we do
* not auto-generate the id for this entity. We can achieve this by adding an extra property,
* albumId, that is mapped to the "id" column. We can then manually set an albumId value before
* inserting the record in the database.
*/
@Table("tracks")
public class Track extends AbstractEntity {
/**
* We need to map this to the "id" column to be able to explicitly set it, instead of letting
* Spring Data generate it. This is necessary, because Track is interleaved in Album. That again
* means that we must use the ID value of the Album for a Track.
*/
@Column("id")
private Long albumId;
/** This is the second part of the primary key of a Track. */
private int trackNumber;
private String title;
private Double sampleRate;
@PersistenceCreator
public Track() {}
public Track(Album album, int trackNumber, String title) {
setAlbumId(album.getId());
this.trackNumber = trackNumber;
this.title = title;
}
public Long getAlbumId() {
return albumId;
}
private void setAlbumId(Long albumId) {
this.albumId = albumId;
}
public int getTrackNumber() {
return trackNumber;
}
public void setTrackNumber(int trackNumber) {
this.trackNumber = trackNumber;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Double getSampleRate() {
return sampleRate;
}
public void setSampleRate(Double sampleRate) {
this.sampleRate = sampleRate;
}
}