1 files changed, 123 insertions, 0 deletions
diff --git a/core/java/android/app/AliasActivity.java b/core/java/android/app/AliasActivity.java
new file mode 100644
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+++ b/core/java/android/app/AliasActivity.java
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+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.app;
+
+import org.xmlpull.v1.XmlPullParser;
+import org.xmlpull.v1.XmlPullParserException;
+
+import android.content.Intent;
+import android.content.pm.ActivityInfo;
+import android.content.pm.PackageManager;
+import android.content.res.XmlResourceParser;
+import android.os.Bundle;
+import android.util.AttributeSet;
+import android.util.Xml;
+import com.android.internal.util.XmlUtils;
+
+import java.io.IOException;
+
+/**
+ * Stub activity that launches another activity (and then finishes itself)
+ * based on information in its component's manifest meta-data.  This is a
+ * simple way to implement an alias-like mechanism.
+ * 
+ * To use this activity, you should include in the manifest for the associated
+ * component an entry named "android.app.alias".  It is a reference to an XML
+ * resource describing an intent that launches the real application.
+ */
+public class AliasActivity extends Activity {
+    /**
+     * This is the name under which you should store in your component the
+     * meta-data information about the alias.  It is a reference to an XML
+     * resource describing an intent that launches the real application.
+     * {@hide}
+     */
+    public final String ALIAS_META_DATA = "android.app.alias";
+    
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        
+        XmlResourceParser parser = null;
+        try {
+            ActivityInfo ai = getPackageManager().getActivityInfo(
+                    getComponentName(), PackageManager.GET_META_DATA);
+            parser = ai.loadXmlMetaData(getPackageManager(),
+                    ALIAS_META_DATA);
+            if (parser == null) {
+                throw new RuntimeException("Alias requires a meta-data field "
+                        + ALIAS_META_DATA);
+            }
+            
+            Intent intent = parseAlias(parser);
+            if (intent == null) {
+                throw new RuntimeException(
+                        "No <intent> tag found in alias description");
+            }
+            
+            startActivity(intent);
+            finish();
+            
+        } catch (PackageManager.NameNotFoundException e) {
+            throw new RuntimeException("Error parsing alias", e);
+        } catch (XmlPullParserException e) {
+            throw new RuntimeException("Error parsing alias", e);
+        } catch (IOException e) {
+            throw new RuntimeException("Error parsing alias", e);
+        } finally {
+            if (parser != null) parser.close();
+        }
+    }
+
+    private Intent parseAlias(XmlPullParser parser)
+            throws XmlPullParserException, IOException {
+        AttributeSet attrs = Xml.asAttributeSet(parser);
+        
+        Intent intent = null;
+        
+        int type;
+        while ((type=parser.next()) != XmlPullParser.END_DOCUMENT
+                && type != XmlPullParser.START_TAG) {
+        }
+        
+        String nodeName = parser.getName();
+        if (!"alias".equals(nodeName)) {
+            throw new RuntimeException(
+                    "Alias meta-data must start with <alias> tag; found"
+                    + nodeName + " at " + parser.getPositionDescription());
+        }
+        
+        int outerDepth = parser.getDepth();
+        while ((type=parser.next()) != XmlPullParser.END_DOCUMENT
+               && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
+            if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) {
+                continue;
+            }
+
+            nodeName = parser.getName();
+            if ("intent".equals(nodeName)) {
+                Intent gotIntent = Intent.parseIntent(getResources(), parser, attrs);
+                if (intent == null) intent = gotIntent;
+            } else {
+                XmlUtils.skipCurrentTag(parser);
+            }
+        }
+        
+        return intent;
+    }
+    
+}