Initial checkin of AOSP Messaging app.

b/23110861

Change-Id: I11db999bd10656801e618f78ab2b2ef74136fff1

src/com/android/messaging/datamodel/CursorQueryData.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2015 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 com.android.messaging.datamodel;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+
+import com.android.messaging.util.Assert;
+import com.google.common.annotations.VisibleForTesting;
+
+/**
+ * Holds parameters and data (such as content URI) for performing queries on the content provider.
+ * This class could then be used to perform a query using either a BoundCursorLoader or querying
+ * on the content resolver directly.
+ *
+ * This class is used for cases where the way to load a cursor is not fixed. For example,
+ * when using ContactUtil to query for phone numbers, the ContactPickerFragment wants to use
+ * a CursorLoader to asynchronously load the data and tie in nicely with its data binding
+ * paradigm, whereas ContactRecipientAdapter wants to synchronously perform the query on the
+ * worker thread.
+ */
+public class CursorQueryData {
+    protected final Uri mUri;
+    protected final String[] mProjection;
+    protected final String mSelection;
+    protected final String[] mSelectionArgs;
+    protected final String mSortOrder;
+    protected final Context mContext;
+
+    public CursorQueryData(final Context context, final Uri uri, final String[] projection,
+            final String selection, final String[] selectionArgs, final String sortOrder) {
+        mContext = context;
+        mUri = uri;
+        mProjection = projection;
+        mSelection = selection;
+        mSelectionArgs = selectionArgs;
+        mSortOrder = sortOrder;
+    }
+
+    public BoundCursorLoader createBoundCursorLoader(final String bindingId) {
+        return new BoundCursorLoader(bindingId, mContext, mUri, mProjection, mSelection,
+                mSelectionArgs, mSortOrder);
+    }
+
+    public Cursor performSynchronousQuery() {
+        Assert.isNotMainThread();
+        if (mUri == null) {
+            // See {@link #getEmptyQueryData}
+            return null;
+        } else {
+            return mContext.getContentResolver().query(mUri, mProjection, mSelection,
+                    mSelectionArgs, mSortOrder);
+        }
+    }
+
+    @VisibleForTesting
+    public Uri getUri() {
+        return mUri;
+    }
+
+    /**
+     * Representation of an invalid query. {@link #performSynchronousQuery} will return
+     * a null Cursor.
+     */
+    public static CursorQueryData getEmptyQueryData() {
+        return new CursorQueryData(null, null, null, null, null, null);
+    }
+}