Add whole directory

9 files changed, 482 insertions, 0 deletions

diff --git a/src/androidTest/java/it/alessandroiezzi/commons/page/ExampleInstrumentedTest.java b/src/androidTest/java/it/alessandroiezzi/commons/page/ExampleInstrumentedTest.java
new file mode 100644
index 0000000..b88b024
--- /dev/null
+++ b/src/androidTest/java/it/alessandroiezzi/commons/page/ExampleInstrumentedTest.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2021-2022  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
+ *
+ * This file is part of TOP-TAB Android.
+ *
+ * TOP-TAB Android is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * TOP-TAB Android 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with TOP-TAB Android.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package it.alessandroiezzi.commons.page;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("it.alessandroiezzi.commons.page.test", appContext.getPackageName());
+    }
+}
\ No newline at end of file
diff --git a/src/main/AndroidManifest.xml b/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..6e32572
--- /dev/null
+++ b/src/main/AndroidManifest.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2021-2022  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
+  ~
+  ~ This file is part of TOP-TAB Android.
+  ~
+  ~ TOP-TAB Android is free software: you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation, either version 3 of the License, or
+  ~ (at your option) any later version.
+  ~
+  ~ TOP-TAB Android 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 for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with TOP-TAB Android.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>
\ No newline at end of file
diff --git a/src/main/java/it/alessandroiezzi/commons/page/Page.java b/src/main/java/it/alessandroiezzi/commons/page/Page.java
new file mode 100644
index 0000000..333dd4f
--- /dev/null
+++ b/src/main/java/it/alessandroiezzi/commons/page/Page.java
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2022  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
+ *
+ * This file is part of commons-page.
+ *
+ * commons-page is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * commons-page 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with commons-page.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package it.alessandroiezzi.commons.page;
+
+import java.util.*;
+
+public interface Page<T> {
+    List<T> getContent();
+    int getSize();
+    int getNumberOfElements();
+}
diff --git a/src/main/java/it/alessandroiezzi/commons/page/PageAdapter.java b/src/main/java/it/alessandroiezzi/commons/page/PageAdapter.java
new file mode 100644
index 0000000..8774677
--- /dev/null
+++ b/src/main/java/it/alessandroiezzi/commons/page/PageAdapter.java
@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2022  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
+ *
+ * This file is part of commons-page.
+ *
+ * commons-page is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * commons-page 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with commons-page.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package it.alessandroiezzi.commons.page;
+
+import java.util.*;
+import java.util.function.*;
+
+public class PageAdapter<T> implements Pages<T> {
+    private final List<T> elements;
+    private final int pageSize;
+    private int pageNumber;
+    private PageChangeListener<T> pageChangeListener;
+    boolean pageChanged = false;
+    private Page<T> currentPage;
+
+    public PageAdapter(List<T> elements) {
+        this(elements, 15);
+    }
+
+    public PageAdapter(List<T> elements, int pageSize) {
+        this.elements = elements;
+        this.pageSize = pageSize;
+        this.pageNumber = 0;
+    }
+
+    @Override
+    public Page<T> firstPage() {
+        return toPage(0);
+    }
+
+    @Override
+    public Page<T> previousPage() {
+        return toPage(pageNumber - 1);
+    }
+
+    @Override
+    public Page<T> nextPage() {
+        return toPage(pageNumber + 1);
+    }
+
+    @Override
+    public Page<T> lastPage() {
+        return toPage(getTotalPages() - 1);
+    }
+
+    @Override
+    public Page<T> toPage(int page) {
+        if (page < 0) {
+            page = 0;
+        } else if (page >= getTotalPages()) {
+            page = getTotalPages() - 1;
+        }
+
+        int totalElements = getNumberOfElements();
+        int startIndex = page * pageSize;
+        if (startIndex > totalElements) {
+            startIndex = totalElements;
+        }
+
+        int count = startIndex + pageSize;
+        if (count > totalElements) {
+            count = totalElements;
+        }
+
+        pageChanged = page != pageNumber;
+        pageNumber = page;
+        List<T> subElements = elements.subList(startIndex, count);
+        currentPage = new PageImpl<>(subElements, pageSize);
+
+        if (pageChangeListener != null && pageChanged) {
+            pageChangeListener.pageChanged(new ArrayList<>(subElements), pageSize);
+        }
+
+        return currentPage;
+    }
+
+    @Override
+    public Page<T> getCurrentPage() {
+        return currentPage;
+    }
+
+    @Override
+    public int getCurrentPageNumber() {
+        return pageNumber;
+    }
+
+    @Override
+    public List<T> getContent() {
+        return getCurrentPage().getContent();
+    }
+
+    @Override
+    public int getSize() {
+        return pageSize;
+    }
+
+    @Override
+    public int getNumberOfElements() {
+        return elements.size();
+    }
+
+    @Override
+    public void addElement(T element) {
+        elements.add(element);
+    }
+
+    @Override
+    public void removeElement(T element) {
+        elements.remove(element);
+    }
+
+    @Override
+    public void removeElementIf(Predicate<T> predicate) {
+        elements.removeIf(predicate);
+    }
+
+    @Override
+    public int getTotalPages() {
+        double pages = (double) getNumberOfElements() / (double) getSize();
+        int pagesInt = (int) pages;
+
+        if (pages > pagesInt)
+            pagesInt++;
+
+        return pagesInt;
+    }
+
+    @Override
+    public void addPageChangeListener(PageChangeListener<T> pageChangeListener) {
+        this.pageChangeListener = pageChangeListener;
+    }
+
+    @Override
+    public List<T> getAllElements() {
+        return elements;
+    }
+
+    @Override
+    public boolean isPageChanged() {
+        return pageChanged;
+    }
+
+    @Override
+    public int from() {
+        return (pageNumber * pageSize) + 1;
+    }
+
+    @Override
+    public int to() {
+        int currentSize = getContent().size();
+        return currentSize < pageSize ? getNumberOfElements() : (pageNumber + 1) * currentSize;
+    }
+}
diff --git a/src/main/java/it/alessandroiezzi/commons/page/PageChangeListener.java b/src/main/java/it/alessandroiezzi/commons/page/PageChangeListener.java
new file mode 100644
index 0000000..a489ddc
--- /dev/null
+++ b/src/main/java/it/alessandroiezzi/commons/page/PageChangeListener.java
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2022  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
+ *
+ * This file is part of commons-page.
+ *
+ * commons-page is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * commons-page 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with commons-page.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package it.alessandroiezzi.commons.page;
+
+import java.util.*;
+
+public interface PageChangeListener<T> {
+    void pageChanged(List<T> elements, int pageSize);
+}
diff --git a/src/main/java/it/alessandroiezzi/commons/page/PageImpl.java b/src/main/java/it/alessandroiezzi/commons/page/PageImpl.java
new file mode 100644
index 0000000..1db709f
--- /dev/null
+++ b/src/main/java/it/alessandroiezzi/commons/page/PageImpl.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2022  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
+ *
+ * This file is part of commons-page.
+ *
+ * commons-page is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * commons-page 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with commons-page.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package it.alessandroiezzi.commons.page;
+
+import java.util.*;
+
+public class PageImpl<T> implements Page<T> {
+    private final List<T> content = new ArrayList<>();
+    private final int size;
+
+    public PageImpl(List<T> content, int pageSize) {
+        int i = pageSize;
+        for (T element : content) {
+            if (i-- == 0) break;
+            this.content.add(element);
+        }
+        this.size = pageSize;
+    }
+
+    @Override
+    public List<T> getContent() {
+        return content;
+    }
+
+    @Override
+    public int getSize() {
+        return size;
+    }
+
+    @Override
+    public int getNumberOfElements() {
+        return content.size();
+    }
+}
diff --git a/src/main/java/it/alessandroiezzi/commons/page/Pages.java b/src/main/java/it/alessandroiezzi/commons/page/Pages.java
new file mode 100644
index 0000000..2f6e98c
--- /dev/null
+++ b/src/main/java/it/alessandroiezzi/commons/page/Pages.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2022  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
+ *
+ * This file is part of commons-page.
+ *
+ * commons-page is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * commons-page 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with commons-page.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package it.alessandroiezzi.commons.page;
+
+import java.util.*;
+import java.util.function.*;
+
+public interface Pages<T> extends Page<T> {
+    Page<T> firstPage();
+    Page<T> lastPage();
+    Page<T> previousPage();
+    Page<T> nextPage();
+    Page<T> toPage(int page);
+    Page<T> getCurrentPage();
+    int getCurrentPageNumber();
+    int getTotalPages();
+    void addElement(T element);
+    void removeElement(T element);
+    void removeElementIf(Predicate<T> predicate);
+    void addPageChangeListener(PageChangeListener<T> pageChangeListener);
+    List<T> getAllElements();
+    boolean isPageChanged();
+    int from();
+    int to();
+}
diff --git a/src/test/java/it/alessandroiezzi/commons/page/ExampleUnitTest.java b/src/test/java/it/alessandroiezzi/commons/page/ExampleUnitTest.java
new file mode 100644
index 0000000..ae6692d
--- /dev/null
+++ b/src/test/java/it/alessandroiezzi/commons/page/ExampleUnitTest.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2022  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
+ *
+ * This file is part of commons-page.
+ *
+ * commons-page is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * commons-page 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with commons-page.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package it.alessandroiezzi.commons.page;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/it/alessandroiezzi/commons/page/PageAdapterUnitTest.java b/src/test/java/it/alessandroiezzi/commons/page/PageAdapterUnitTest.java
new file mode 100644
index 0000000..65b880d
--- /dev/null
+++ b/src/test/java/it/alessandroiezzi/commons/page/PageAdapterUnitTest.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2022  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
+ *
+ * This file is part of commons-page.
+ *
+ * commons-page is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * commons-page 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with commons-page.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package it.alessandroiezzi.commons.page;
+
+import org.junit.*;
+
+import java.util.*;
+
+import static org.junit.Assert.*;
+
+public class PageAdapterUnitTest {
+    @Test
+    public void test() {
+        int max = 48;
+        List<Integer> integers = new ArrayList<>();
+        for (int i = 1; i < max; i++) {
+            integers.add(i);
+        }
+        Pages<Integer> pages = new PageAdapter<>(integers);
+        assertEquals(4, pages.getTotalPages());
+
+        int i = 0;
+        for (Integer integer : pages.firstPage().getContent()) {
+            assertEquals(++i, (int) integer);
+        }
+        assertEquals(i, 15);
+
+        for (Integer integer : pages.lastPage().getContent()) {
+//            System.out.println(integer);
+        }
+
+        for (int j = max; j < max + 13; j++) {
+            pages.addElement(j);
+        }
+        pages.removeElementIf((e) -> e > 0 && e < 58);
+        for (Integer integer : pages.lastPage().getContent()) {
+            System.out.println(integer);
+        }
+        System.out.println();
+        for (Integer integer : pages.firstPage().getContent()) {
+            System.out.println(integer);
+        }
+    }
+}
\ No newline at end of file