History refactor

app/src/main/java/org/solovyev/android/io/BaseFileLoader.java

@@ -0,0 +1,48 @@
+package org.solovyev.android.io;
+
+import android.content.Context;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.util.Log;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+abstract class BaseFileLoader {
+
+    @NonNull
+    protected final Context context;
+
+    public BaseFileLoader(@NonNull Context context) {
+        this.context = context;
+    }
+
+    @Nullable
+    public CharSequence load() {
+        BufferedReader reader = null;
+        try {
+            final InputStream is = getInputStream();
+            if (is == null) {
+                return null;
+            }
+            reader = new BufferedReader(new InputStreamReader(is));
+            final StringBuilder result = new StringBuilder();
+            String line = reader.readLine();
+            while (line != null) {
+                result.append(line).append("\n");
+                line = reader.readLine();
+            }
+            return result;
+        } catch (IOException e) {
+            Log.e(getClass().getSimpleName(), e.getMessage(), e);
+        } finally {
+            Io.close(reader);
+        }
+        return null;
+    }
+
+    @Nullable
+    protected abstract InputStream getInputStream() throws IOException;
+}

app/src/main/java/org/solovyev/android/io/BaseFileSaver.java

@@ -0,0 +1,39 @@
+package org.solovyev.android.io;
+
+import android.support.annotation.NonNull;
+import android.util.Log;
+
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+
+public abstract class BaseFileSaver implements Runnable {
+
+    @NonNull
+    private final CharSequence data;
+
+    protected BaseFileSaver(@NonNull CharSequence data) {
+        this.data = data;
+    }
+
+    public void save() {
+        OutputStreamWriter out = null;
+        try {
+            out = new OutputStreamWriter(getOutputStream());
+            out.write(data.toString());
+        } catch (IOException e) {
+            Log.e("FileSaver", e.getMessage(), e);
+        } finally {
+            Io.close(out);
+        }
+    }
+
+    @NonNull
+    protected abstract FileOutputStream getOutputStream() throws FileNotFoundException;
+
+    @Override
+    public void run() {
+        save();
+    }
+}

app/src/main/java/org/solovyev/android/io/FileSaver.java

@@ -0,0 +1,28 @@
+package org.solovyev.android.io;
+
+import android.support.annotation.NonNull;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+
+public class FileSaver extends BaseFileSaver {
+
+    @NonNull
+    private final File file;
+
+    private FileSaver(@NonNull File file, @NonNull CharSequence data) {
+        super(data);
+        this.file = file;
+    }
+
+    public static void save(@NonNull File file, @NonNull CharSequence data) {
+        final FileSaver fileSaver = new FileSaver(file, data);
+        fileSaver.save();
+    }
+
+    @NonNull
+    protected FileOutputStream getOutputStream() throws FileNotFoundException {
+        return new FileOutputStream(file);
+    }
+}

app/src/main/java/org/solovyev/android/io/Io.java

@@ -0,0 +1,22 @@
+package org.solovyev.android.io;
+
+import android.util.Log;
+
+import java.io.Closeable;
+import java.io.IOException;
+
+public final class Io {
+
+    private Io() {
+    }
+
+    public static void close(Closeable closeable) {
+        try {
+            if (closeable != null) {
+                closeable.close();
+            }
+        } catch (IOException e) {
+            Log.e("Io", e.getMessage(), e);
+        }
+    }
+}