1 files changed, 84 insertions, 0 deletions
diff --git a/java/com/android/contacts/common/database/EmptyCursor.java b/java/com/android/contacts/common/database/EmptyCursor.java
new file mode 100644
index 000000000..c2b24cdf7
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+++ b/java/com/android/contacts/common/database/EmptyCursor.java
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+/*
+ * Copyright (C) 2012 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.contacts.common.database;
+
+import android.database.AbstractCursor;
+import android.database.CursorIndexOutOfBoundsException;
+
+/**
+ * A cursor that is empty.
+ *
+ * <p>If you want an empty cursor, this class is better than a MatrixCursor because it has less
+ * overhead.
+ */
+public final class EmptyCursor extends AbstractCursor {
+
+  private String[] mColumns;
+
+  public EmptyCursor(String[] columns) {
+    this.mColumns = columns;
+  }
+
+  @Override
+  public int getCount() {
+    return 0;
+  }
+
+  @Override
+  public String[] getColumnNames() {
+    return mColumns;
+  }
+
+  @Override
+  public String getString(int column) {
+    throw cursorException();
+  }
+
+  @Override
+  public short getShort(int column) {
+    throw cursorException();
+  }
+
+  @Override
+  public int getInt(int column) {
+    throw cursorException();
+  }
+
+  @Override
+  public long getLong(int column) {
+    throw cursorException();
+  }
+
+  @Override
+  public float getFloat(int column) {
+    throw cursorException();
+  }
+
+  @Override
+  public double getDouble(int column) {
+    throw cursorException();
+  }
+
+  @Override
+  public boolean isNull(int column) {
+    throw cursorException();
+  }
+
+  private CursorIndexOutOfBoundsException cursorException() {
+    return new CursorIndexOutOfBoundsException("Operation not permitted on an empty cursor.");
+  }
+}