new class for observing a list

notifies observers when items are added/removed/set

can't intercept direct item modifications

diff --git a/app/src/main/java/net/ktnx/mobileledger/utils/ObservableList.java b/app/src/main/java/net/ktnx/mobileledger/utils/ObservableList.java
new file mode 100644 (file)
index 0000000..9893c5d
--- /dev/null
+++ b/app/src/main/java/net/ktnx/mobileledger/utils/ObservableList.java
@@ -0,0 +1,177 @@
+/*
+ * Copyright © 2019 Damyan Ivanov.
+ * This file is part of Mobile-Ledger.
+ * Mobile-Ledger is free software: you can distribute it and/or modify it
+ * under the term of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your opinion), any later version.
+ *
+ * Mobile-Ledger is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License terms for details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.ktnx.mobileledger.utils;
+
+import android.os.Build;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.annotation.RequiresApi;
+
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.Iterator;
+import java.util.List;
+import java.util.ListIterator;
+import java.util.Observable;
+import java.util.Spliterator;
+import java.util.function.Consumer;
+import java.util.function.Predicate;
+import java.util.function.UnaryOperator;
+import java.util.stream.Stream;
+
+public class ObservableList<T> extends Observable {
+    private List<T> list;
+    public ObservableList(List<T> list) {
+        this.list = list;
+    }
+    private void forceNotify() {
+        setChanged();
+        notifyObservers();
+    }
+    private void forceNotify(Object arg) {
+        setChanged();
+        notifyObservers(arg);
+    }
+    public int size() {
+        return list.size();
+    }
+    public boolean isEmpty() {
+        return list.isEmpty();
+    }
+    public boolean contains(@Nullable Object o) {
+        return list.contains(o);
+    }
+    public Iterator<T> iterator() {
+        return list.iterator();
+    }
+    public Object[] toArray() {
+        return list.toArray();
+    }
+    public <T1> T1[] toArray(@Nullable T1[] a) {
+        return list.toArray(a);
+    }
+    public boolean add(T t) {
+        boolean result = list.add(t);
+        if (result) forceNotify();
+        return result;
+    }
+    public boolean remove(@Nullable Object o) {
+        boolean result = list.remove(o);
+        if (result) forceNotify();
+        return result;
+    }
+    public boolean containsAll(@NonNull Collection<?> c) {
+        return list.containsAll(c);
+    }
+    public boolean addAll(@NonNull Collection<? extends T> c) {
+        boolean result = list.addAll(c);
+        if (result) forceNotify();
+        return result;
+    }
+    public boolean addAll(int index, @NonNull Collection<? extends T> c) {
+        boolean result = list.addAll(index, c);
+        if (result) forceNotify();
+        return result;
+    }
+    public boolean removeAll(@NonNull Collection<?> c) {
+        boolean result = list.removeAll(c);
+        if (result) forceNotify();
+        return result;
+    }
+    public boolean retainAll(@NonNull Collection<?> c) {
+        boolean result = list.retainAll(c);
+        if (result) forceNotify();
+        return result;
+    }
+    @RequiresApi(api = Build.VERSION_CODES.N)
+    public void replaceAll(@NonNull UnaryOperator<T> operator) {
+        list.replaceAll(operator);
+        forceNotify();
+    }
+    @RequiresApi(api = Build.VERSION_CODES.N)
+    public void sort(@Nullable Comparator<? super T> c) {
+        list.sort(c);
+        forceNotify();
+    }
+    public void clear() {
+        boolean wasEmpty = list.isEmpty();
+        list.clear();
+        if (!wasEmpty) forceNotify();
+    }
+    public T get(int index) {
+        return list.get(index);
+    }
+    public T set(int index, T element) {
+        T result = list.set(index, element);
+        forceNotify();
+        return result;
+    }
+    public void add(int index, T element) {
+        list.add(index, element);
+        forceNotify();
+    }
+    public T remove(int index) {
+        T result = list.remove(index);
+        forceNotify();
+        return result;
+    }
+    public int indexOf(@Nullable Object o) {
+        return list.indexOf(o);
+    }
+    public int lastIndexOf(@Nullable Object o) {
+        return list.lastIndexOf(o);
+    }
+    public ListIterator<T> listIterator() {
+        return list.listIterator();
+    }
+    public ListIterator<T> listIterator(int index) {
+        return list.listIterator(index);
+    }
+    public List<T> subList(int fromIndex, int toIndex) {
+        return list.subList(fromIndex, toIndex);
+    }
+    @RequiresApi(api = Build.VERSION_CODES.N)
+    public Spliterator<T> spliterator() {
+        return list.spliterator();
+    }
+    @RequiresApi(api = Build.VERSION_CODES.N)
+    public boolean removeIf(Predicate<? super T> filter) {
+        boolean result = list.removeIf(filter);
+        if (result) forceNotify();
+        return result;
+    }
+    @RequiresApi(api = Build.VERSION_CODES.N)
+    public Stream<T> stream() {
+        return list.stream();
+    }
+    @RequiresApi(api = Build.VERSION_CODES.N)
+    public Stream<T> parallelStream() {
+        return list.parallelStream();
+    }
+    @RequiresApi(api = Build.VERSION_CODES.N)
+    public void forEach(Consumer<? super T> action) {
+        list.forEach(action);
+    }
+    public void setList(List<T> aList) {
+        list = aList;
+        forceNotify();
+    }
+    public Iterable<? extends T> getList() {
+        return list;
+    }
+}
\ No newline at end of file