Assets render theme, closes #162

vtm-android/src/org/oscim/android/theme/AssetsRenderTheme.java

@@ -0,0 +1,98 @@
+/*
+ * Copyright 2010, 2011, 2012 mapsforge.org
+ * Copyright 2016 devemux86
+ *
+ * This program is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.oscim.android.theme;
+
+import android.content.Context;
+import android.text.TextUtils;
+
+import org.oscim.theme.IRenderTheme.ThemeException;
+import org.oscim.theme.ThemeFile;
+import org.oscim.theme.XmlRenderThemeMenuCallback;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * An AssetsRenderTheme allows for customizing the rendering style of the map
+ * via an XML from the Android assets folder.
+ */
+public class AssetsRenderTheme implements ThemeFile {
+    private static final long serialVersionUID = 1L;
+
+    private final InputStream mInputStream;
+    private final XmlRenderThemeMenuCallback mMenuCallback;
+    private final String mRelativePathPrefix;
+
+    /**
+     * @param context            the Android context.
+     * @param relativePathPrefix the prefix for all relative resource paths.
+     * @param fileName           the path to the XML render theme file.
+     * @throws ThemeException if an error occurs while reading the render theme XML.
+     */
+    public AssetsRenderTheme(Context context, String relativePathPrefix, String fileName) throws ThemeException {
+        this(context, relativePathPrefix, fileName, null);
+    }
+
+    /**
+     * @param context            the Android context.
+     * @param relativePathPrefix the prefix for all relative resource paths.
+     * @param fileName           the path to the XML render theme file.
+     * @param menuCallback       the interface callback to create a settings menu on the fly.
+     * @throws ThemeException if an error occurs while reading the render theme XML.
+     */
+    public AssetsRenderTheme(Context context, String relativePathPrefix, String fileName, XmlRenderThemeMenuCallback menuCallback) throws ThemeException {
+        mRelativePathPrefix = relativePathPrefix;
+        mMenuCallback = menuCallback;
+
+        try {
+            mInputStream = context.getAssets().open((TextUtils.isEmpty(mRelativePathPrefix) ? "" : mRelativePathPrefix) + fileName);
+        } catch (IOException e) {
+            throw new ThemeException(e.getMessage());
+        }
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        } else if (!(obj instanceof AssetsRenderTheme)) {
+            return false;
+        }
+        AssetsRenderTheme other = (AssetsRenderTheme) obj;
+        if (mInputStream != other.mInputStream) {
+            return false;
+        }
+        if (mRelativePathPrefix != other.mRelativePathPrefix) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public XmlRenderThemeMenuCallback getMenuCallback() {
+        return mMenuCallback;
+    }
+
+    @Override
+    public String getRelativePathPrefix() {
+        return mRelativePathPrefix;
+    }
+
+    @Override
+    public InputStream getRenderThemeAsStream() throws ThemeException {
+        return mInputStream;
+    }
+}

vtm-themes/src/org/oscim/theme/VtmThemes.java

@@ -19,6 +19,7 @@
 package org.oscim.theme;
 
 import org.oscim.backend.AssetAdapter;
+import org.oscim.theme.IRenderTheme.ThemeException;
 
 import java.io.InputStream;
 
@@ -49,7 +50,7 @@ public enum VtmThemes implements ThemeFile {
     }
 
     @Override
-    public InputStream getRenderThemeAsStream() {
+    public InputStream getRenderThemeAsStream() throws ThemeException {
         return AssetAdapter.readFileAsStream(mPath);
     }
 }