Move XML code to the common library

The ManifestMerger library needs to look up the prefix to use for the
Android namespace, and the Document.lookupPrefix method is not
implemented by the Eclipse DOM implementation (which throws an
exception).  However, we have an implementation of this in the ADT
plugin.

This changeset creates a new XmlUtils class in the common/ library
(which is accessible by both ADT and the manifest merger, and the
anttasks where the manifest merger is used), and moves the namespace
prefix lookup code in there.  It also moves the XML escape methods
into that class. It also adds a new method to the ManifestMerger for
merging directly from documents (rather than files), and makes sure
that all the merging code goes via the prefix utility method rather
than calling the document.lookupPrefix method.

Finally, it moves the various string constants associated with XML
namespaces into the single XmlUtils class, since these were spread
across several different classes before (and many of them are needed
in the XmlUtils class).

The vast majority of the diffs in this changeset are related to simple
import statement changes to reflect the new locations of these
constants.

Change-Id: Ib8f3d0e5c89e47e61ea509a23925af7b6580abee

2 files changed, 32 insertions, 5 deletions

diff --git a/manifmerger/src/com/android/manifmerger/ManifestMerger.java b/manifmerger/src/com/android/manifmerger/ManifestMerger.java
index 6eac978..8dfd398 100755
--- a/manifmerger/src/com/android/manifmerger/ManifestMerger.java
+++ b/manifmerger/src/com/android/manifmerger/ManifestMerger.java
@@ -186,6 +186,35 @@ public class ManifestMerger {
         return success;
     }
 
+    /**
+     * Performs the merge operation in-place in the given DOM.
+     * <p/>
+     * This does NOT stop on errors, in an attempt to accumulate as much
+     * info as possible to return to the user.
+     *
+     * @param mainDoc The document to merge into. Will be modified in-place.
+     * @param libraryDocs The library manifest documents to merge in. Must not be null.
+     * @return True on success, false if any error occurred (printed to the {@link ISdkLog}).
+     */
+    public boolean process(@NonNull Document mainDoc, @NonNull Document... libraryDocs) {
+
+        boolean success = true;
+        mMainDoc = mainDoc;
+
+        String prefix = XmlUtils.lookupNsPrefix(mainDoc, SdkConstants.NS_RESOURCES);
+        mXPath = AndroidXPathFactory.newXPath(prefix);
+
+        for (Document libDoc : libraryDocs) {
+            if (!mergeLibDoc(libDoc)) {
+                success = false;
+            }
+        }
+
+        mXPath = null;
+        mMainDoc = null;
+        return success;
+    }
+
     // --------
 
     /**
@@ -884,8 +913,8 @@ public class ManifestMerger {
      */
     private Node insertAtEndOf(Element dest, Node start, Node end) {
         // Check whether we'll need to adjust URI prefixes
-        String destPrefix = mMainDoc.lookupPrefix(NS_URI);
-        String srcPrefix  = start.getOwnerDocument().lookupPrefix(NS_URI);
+        String destPrefix = XmlUtils.lookupNsPrefix(mMainDoc, NS_URI);
+        String srcPrefix  = XmlUtils.lookupNsPrefix(start.getOwnerDocument(), NS_URI);
         boolean needPrefixChange = destPrefix != null && !destPrefix.equals(srcPrefix);
 
         // First let's figure out the insertion point.
diff --git a/manifmerger/src/com/android/manifmerger/XmlUtils.java b/manifmerger/src/com/android/manifmerger/XmlUtils.java
index d18eebb..ed5b8a8 100755
--- a/manifmerger/src/com/android/manifmerger/XmlUtils.java
+++ b/manifmerger/src/com/android/manifmerger/XmlUtils.java
@@ -215,9 +215,7 @@ class XmlUtils {
      * @return The namespace prefix if found or null.
      */
     static String lookupNsPrefix(Document doc, String nsUri) {
-        // Note: if this is not available, there's an alternate implementation at
-        // com.android.ide.eclipse.adt.internal.editors.uimodel.UiElementNode.lookupNamespacePrefix(Node, String)
-        return doc.lookupPrefix(nsUri);
+        return com.android.util.XmlUtils.lookupNamespacePrefix(doc, nsUri);
     }
 
     /**