bridge added

Author: maciej-nowak

bridge/README.md

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+# bridge
+This is repository of http://androidcode.pl blog. It shows uses of Bridge in Android. It is a part of Design Patterns - Bridge post in the blog.

bridge/example/Main.java

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+public class Main {
+    
+    public static void main() {
+        //check conditions and decide
+        StorageManager storageManager = new LollipopStorageManager();
+        Writer writer = new DocumentWriter(storageManager);
+
+        //do some actions
+        writer.showDocuments();
+        writer.openDocumnet("Document1");
+        writer.closeDocument();
+
+        //choosen abstraction has changed
+        writer = new SheetWriter(storageManager);
+        //do some actions
+    }
+}

bridge/example/abstraction/DocumentWriter.java

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+public class DocumentWriter implements Writer {
+
+    private StorageManager storageManager;
+
+    public DocumentWriter(StorageManager storageManager) {
+        this.storageManager = storageManager;
+    }
+
+    @Override
+    public void openDocument(String name) {
+        storageManager.readFile(path);
+    }
+
+    @Override
+    public void closeDocument() {
+        //if is save checked then save file
+        storageManager.writeFile(content);
+        showEditor(false);
+    }
+
+    @Override
+    public void createDocument(String name) {
+        storageManager.writeFile(name, "");
+        showEditor(true);
+    }
+
+    @Override
+    public void deleteDocument(String name) {
+        storageManager.deleteFile(name);
+    }
+
+    @Override
+    public void showDocuments() {
+        File[] files = storageManager.readFolder();
+        //draw files list with specific theme
+    }
+
+    @Override
+    public void showEditor(boolean isShowed) {
+        if(isShowed) {
+            //draw editor with specific theme
+        }
+        else {
+            //just close editor
+        }
+    }
+}

bridge/example/abstraction/SheetWriter.java

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+public class SheetWriter implements Writer {
+
+    private StorageManager storageManager;
+
+    public DocumentWriter(StorageManager storageManager) {
+        this.storageManager = storageManager;
+    }
+
+    //implements Writer method in similiar way to DocumentWriter
+    //use own style for editor windows
+}

bridge/example/abstraction/Writer.java

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+public interface Writer {
+
+    void openDocument(String name);
+    void closeDocument();
+    void createDocument(String name);
+    void deleteDocument(String name);
+    void showDocuments();
+    void showEditor(boolean isShowed);
+}

bridge/example/implementor/LollipopStorageManager.java

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+public class LollipopStorageManager implements StorageManager {
+
+    private String currentFile;
+    private String folderPath = "/path/to/lollipop/folder"; //get path in specific way
+
+    @Override
+    public void readFile(String name) {
+        //check READ_EXTERNAL_STORAGE permissions
+        //if OK, open file
+        currentFile = name;
+        //else show permissions dialog
+    }
+
+    @Override
+    public File[] readFolder() {
+        //check READ_EXTERNAL_STORAGE permissions
+        //if OK, return files List
+        File folder = new File(folderPath);
+        return folder.listFiles;
+        //else show permissions dialog
+    }
+
+    @Override
+    public void writeFile(String name, String content) {
+        //check WRITE_EXTERNAL_STORAGE permissions
+        //if OK, write file
+        //else show permissions dialog
+    }
+
+    @Override
+    public void writeFile(String content) {
+        //check WRITE_EXTERNAL_STORAGE permissions
+        //just write content to current file
+        //else show permissions dialog
+    }
+
+    @Override
+    public void deleteFile(String name) {
+        //check WRITE_EXTERNAL_STORAGE permissions
+        //if OK, open file
+        File file = new File(name);
+        file.delete();
+        //else show permissions dialog
+    }
+}

bridge/example/implementor/StorageManager.java

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+public interface StorageManager {
+
+    void readFile(String name);
+    File[] readFolder();
+    void writeFile(String name, String content);
+    void deleteFile(String name);
+}

bridge/example/implementor/UnderLollipopStorageManager.java

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+public class UnderLollipopStorageManager implements StorageManager {
+
+    private String currentFile;
+    private String folderPath = "/path/to/underlollipop/folder"; //get path in specific way
+
+    @Override
+    public void readFile(String name) {
+        //just open file
+        currentFile = name;
+    }
+
+    @Override
+    public File[] readFolder(String name) {
+        File folder = new File(name);
+        return folder.listFiles;
+    }
+
+    @Override
+    public void writeFile(String name, String content) {
+        //just write file with content
+    }
+
+    @Override
+    public void writeFile(String content) {
+        //just write content to current file
+    }
+
+    @Override
+    public void deleteFile(String name) {
+        File file = new File(name);
+        file.delete();
+    }
+}

bridge/pattern/Main.java

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+public class Main {
+
+    public static void main() {
+        //some case to use Implementator1
+        Abstraction abstraction1 = new Abstraction1(new Implementor1());
+        abstraction1.operation1(); //runs operation1 from Implementor1
+
+        //some case to use Implementator2
+        Abstraction abstraction2 = new Abstraction2(new Implementor2());
+        abstraction2.operation2(); //runs operation2 from Implementor2
+    }
+}

bridge/pattern/abstraction/Abstraction.java

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+public interface Abstraction {
+	
+    void operation1();
+    void operation2();
+    void operation3();
+}