90 lines
2.5 KiB
Java
90 lines
2.5 KiB
Java
package org.thoughtcrime.securesms.search;
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import android.arch.lifecycle.LiveData;
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import android.arch.lifecycle.MutableLiveData;
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import android.arch.lifecycle.ViewModel;
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import android.arch.lifecycle.ViewModelProvider;
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import android.support.annotation.NonNull;
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import org.thoughtcrime.securesms.search.model.SearchResult;
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import org.thoughtcrime.securesms.util.Debouncer;
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/**
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* A {@link ViewModel} for handling all the business logic and interactions that take place inside
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* of the {@link SearchFragment}.
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*
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* This class should be view- and Android-agnostic, and therefore should contain no references to
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* things like {@link android.content.Context}, {@link android.view.View},
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* {@link android.support.v4.app.Fragment}, etc.
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*/
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class SearchViewModel extends ViewModel {
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private final ClosingLiveData searchResult;
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private final SearchRepository searchRepository;
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private final Debouncer debouncer;
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private String lastQuery;
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SearchViewModel(@NonNull SearchRepository searchRepository) {
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this.searchResult = new ClosingLiveData();
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this.searchRepository = searchRepository;
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this.debouncer = new Debouncer(500);
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}
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LiveData<SearchResult> getSearchResult() {
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return searchResult;
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}
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void updateQuery(String query) {
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lastQuery = query;
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debouncer.publish(() -> searchRepository.query(query, searchResult::postValue));
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}
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@NonNull
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String getLastQuery() {
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return lastQuery == null ? "" : lastQuery;
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}
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@Override
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protected void onCleared() {
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searchResult.close();
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}
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/**
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* Ensures that the previous {@link SearchResult} is always closed whenever we set a new one.
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*/
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private static class ClosingLiveData extends MutableLiveData<SearchResult> {
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@Override
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public void setValue(SearchResult value) {
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SearchResult previous = getValue();
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if (previous != null) {
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previous.close();
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}
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super.setValue(value);
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}
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public void close() {
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SearchResult value = getValue();
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if (value != null) {
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value.close();
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}
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}
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}
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public static class Factory extends ViewModelProvider.NewInstanceFactory {
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private final SearchRepository searchRepository;
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public Factory(@NonNull SearchRepository searchRepository) {
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this.searchRepository = searchRepository;
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}
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@NonNull
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@Override
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public <T extends ViewModel> T create(@NonNull Class<T> modelClass) {
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return modelClass.cast(new SearchViewModel(searchRepository));
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}
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}
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}
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