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xcesco
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149 changes: 75 additions & 74 deletions
149
...ndroid-core/src/main/java/com/abubusoft/kripton/androidx/livedata/KriptonXDataSource.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,90 +1,91 @@ | ||
| package com.abubusoft.kripton.androidx.livedata; | ||
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| import java.util.Collections; | ||
| import java.util.List; | ||
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| import androidx.annotation.NonNull; | ||
| import androidx.lifecycle.Observer; | ||
| import androidx.paging.DataSource; | ||
| import androidx.paging.PositionalDataSource; | ||
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| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
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| /** | ||
| * A {@link PositionalDataSource} that loads entities based on an ObjectBox | ||
| * {@link Query} using offset and limit to implement paging support. The data | ||
| * source is invalidated if the query results change. | ||
| */ | ||
| public class KriptonXDataSource<T> extends PositionalDataSource<T> { | ||
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| private final PagedLiveData<T> query; | ||
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| private final Observer<T> observer; | ||
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| public static class Factory<Item> extends DataSource.Factory<Integer, Item> { | ||
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| private final PagedLiveData<Item> query; | ||
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| public Factory(PagedLiveData<Item> query) { | ||
| this.query = query; | ||
| } | ||
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| @Override | ||
| public KriptonXDataSource<Item> create() { | ||
| return new KriptonXDataSource<>(query); | ||
| } | ||
| } | ||
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| public KriptonXDataSource(PagedLiveData<T> query) { | ||
| this.query = query; | ||
| observer = new Observer<T>() { | ||
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| @Override | ||
| public void onChanged(T t) { | ||
| invalidate(); | ||
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| } | ||
| }; | ||
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| query.observeForever(observer); | ||
| // observer will be automatically removed once GC'ed | ||
| // query. subscribe().onlyChanges().weak().observer(observer); | ||
| } | ||
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| @Override | ||
| public void loadInitial(@NonNull LoadInitialParams params, @NonNull LoadInitialCallback<T> callback) { | ||
| // note: limiting to int should be fine for Android apps | ||
| // TODO ripristinare query.count(); | ||
| int totalCount = query.getTotalElements(); | ||
| if (totalCount == 0) { | ||
| callback.onResult(Collections.<T>emptyList(), 0, 0); | ||
| return; | ||
| } | ||
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| int position = computeInitialLoadPosition(params, totalCount); | ||
| int loadSize = computeInitialLoadSize(params, position, totalCount); | ||
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| List<T> list = loadRange(position, loadSize); | ||
| if (list.size() == loadSize) { | ||
| callback.onResult(list, position, totalCount); | ||
| } else { | ||
| invalidate(); // size doesn't match request - DB modified between | ||
| // count and load | ||
| } | ||
| } | ||
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| @Override | ||
| public void loadRange(@NonNull LoadRangeParams params, @NonNull LoadRangeCallback<T> callback) { | ||
| callback.onResult(loadRange(params.startPosition, params.loadSize)); | ||
| } | ||
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| private List<T> loadRange(int startPosition, int loadCount) { | ||
| /* private void loadRange(int startPosition, int loadCount) { */ | ||
| // note: find interprets loadCount 0 as no limit | ||
| //query.moveTo(startPosition, loadCount); | ||
| query.createPageRequestBuilder().offset(startPosition).pageSize(loadCount).apply(); | ||
| return null; | ||
| } | ||
| private final PagedLiveData<T> query; | ||
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| private final Observer<T> observer; | ||
|
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| public static class Factory<Item> extends DataSource.Factory<Integer, Item> { | ||
|
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| private final PagedLiveData<Item> query; | ||
|
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| public Factory(PagedLiveData<Item> query) { | ||
| this.query = query; | ||
| } | ||
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| @Override | ||
| public KriptonXDataSource<Item> create() { | ||
| return new KriptonXDataSource<>(query); | ||
| } | ||
| } | ||
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| public KriptonXDataSource(PagedLiveData<T> query) { | ||
| this.query = query; | ||
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| observer = new Observer<T>() { | ||
|
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| @Override | ||
| public void onChanged(T t) { | ||
| invalidate(); | ||
|
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| } | ||
| }; | ||
|
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| query.observeForever(observer); | ||
| // observer will be automatically removed once GC'ed | ||
| // query. subscribe().onlyChanges().weak().observer(observer); | ||
| } | ||
|
|
||
| @Override | ||
| public void loadInitial(@NonNull LoadInitialParams params, @NonNull LoadInitialCallback<T> callback) { | ||
| // note: limiting to int should be fine for Android apps | ||
| // TODO ripristinare query.count(); | ||
| int totalCount = query.getTotalElements(); | ||
| if (totalCount == 0) { | ||
| callback.onResult(Collections.<T>emptyList(), 0, 0); | ||
| return; | ||
| } | ||
|
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| int position = computeInitialLoadPosition(params, totalCount); | ||
| int loadSize = computeInitialLoadSize(params, position, totalCount); | ||
|
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| List<T> list = loadRange(position, loadSize); | ||
| if (list != null && list.size() == loadSize) { | ||
| callback.onResult(list, position, totalCount); | ||
| } else { | ||
| invalidate(); // size doesn't match request - DB modified between | ||
| // count and load | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void loadRange(@NonNull LoadRangeParams params, @NonNull LoadRangeCallback<T> callback) { | ||
| callback.onResult(loadRange(params.startPosition, params.loadSize)); | ||
| } | ||
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| private List<T> loadRange(int startPosition, int loadCount) { | ||
| /* private void loadRange(int startPosition, int loadCount) { */ | ||
| // note: find interprets loadCount 0 as no limit | ||
| //query.moveTo(startPosition, loadCount); | ||
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| query.createPageRequestBuilder().offset(startPosition).pageSize(loadCount).apply(); | ||
|
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| return new ArrayList<>(); | ||
| } | ||
|
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| } |
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