192 lines
4.2 KiB
Java
192 lines
4.2 KiB
Java
package org.thoughtcrime.securesms.database;
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import android.database.Cursor;
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import android.database.MatrixCursor;
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import android.support.annotation.NonNull;
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import java.io.Closeable;
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import java.util.Collection;
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import java.util.Iterator;
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import java.util.List;
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import java.util.ListIterator;
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/**
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* A list backed by a {@link Cursor} that retrieves models using a provided {@link ModelBuilder}.
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* Allows you to abstract away the use of a {@link Cursor} while still getting the benefits of a
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* {@link Cursor} (e.g. windowing).
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*
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* The one special consideration that must be made is that because this contains a cursor, you must
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* call {@link #close()} when you are finished with it.
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*
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* Given that this is cursor-backed, it is effectively immutable.
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*/
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public class CursorList<T> implements List<T>, Closeable {
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private static final Cursor EMPTY_CURSOR = new MatrixCursor(new String[] { "a" }, 0);
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private final Cursor cursor;
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private final ModelBuilder<T> modelBuilder;
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public CursorList(@NonNull Cursor cursor, @NonNull ModelBuilder<T> modelBuilder) {
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this.cursor = cursor;
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this.modelBuilder = modelBuilder;
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this.cursor.moveToFirst();
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}
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public static <T> CursorList<T> emptyList() {
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//noinspection ConstantConditions,unchecked
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return (CursorList<T>) new CursorList(EMPTY_CURSOR, null);
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}
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@Override
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public int size() {
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return cursor.getCount();
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}
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@Override
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public boolean isEmpty() {
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return size() == 0;
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}
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@Override
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public boolean contains(Object o) {
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throw new UnsupportedOperationException();
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}
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@NonNull
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@Override
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public Iterator<T> iterator() {
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return new Iterator<T>() {
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@Override
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public boolean hasNext() {
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return cursor.getCount() > 0 && !cursor.isLast();
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}
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@Override
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public T next() {
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T model = modelBuilder.build(cursor);
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cursor.moveToNext();
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return model;
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}
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};
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}
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@NonNull
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@Override
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public Object[] toArray() {
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Object[] out = new Object[size()];
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for (int i = 0; i < cursor.getCount(); i++) {
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cursor.moveToPosition(i);
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out[i] = modelBuilder.build(cursor);
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}
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return out;
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}
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@Override
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public boolean add(T o) {
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean remove(Object o) {
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean addAll(@NonNull Collection collection) {
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean addAll(int i, @NonNull Collection collection) {
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throw new UnsupportedOperationException();
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}
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@Override
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public void clear() {
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throw new UnsupportedOperationException();
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}
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@Override
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public T get(int i) {
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cursor.moveToPosition(i);
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return modelBuilder.build(cursor);
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}
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@Override
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public T set(int i, T o) {
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throw new UnsupportedOperationException();
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}
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@Override
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public void add(int i, T o) {
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throw new UnsupportedOperationException();
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}
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@Override
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public T remove(int i) {
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throw new UnsupportedOperationException();
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}
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@Override
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public int indexOf(Object o) {
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throw new UnsupportedOperationException();
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}
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@Override
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public int lastIndexOf(Object o) {
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throw new UnsupportedOperationException();
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}
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@Override
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public ListIterator<T> listIterator() {
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throw new UnsupportedOperationException();
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}
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@NonNull
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@Override
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public ListIterator<T> listIterator(int i) {
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throw new UnsupportedOperationException();
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}
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@NonNull
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@Override
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public List<T> subList(int i, int i1) {
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean retainAll(@NonNull Collection collection) {
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean removeAll(@NonNull Collection collection) {
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean containsAll(@NonNull Collection collection) {
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throw new UnsupportedOperationException();
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}
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@NonNull
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@Override
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public T[] toArray(@NonNull Object[] objects) {
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throw new UnsupportedOperationException();
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}
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@Override
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public void close() {
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if (cursor != null) {
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cursor.close();
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}
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}
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public interface ModelBuilder<T> {
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T build(@NonNull Cursor cursor);
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}
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}
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