Moving ProjectionMap into frameworks/ex.

Change-Id: Ida7831c961dd4a132e6c5bb3fffacceca2f41d44

1 files changed, 85 insertions, 0 deletions

diff --git a/common/java/com/android/common/content/ProjectionMap.java b/common/java/com/android/common/content/ProjectionMap.java
new file mode 100644
index 0000000..d7d005f
--- /dev/null
+++ b/common/java/com/android/common/content/ProjectionMap.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2010 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.common.content;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * A convenience wrapper for a projection map.  Makes it easier to create and use projection maps.
+ */
+public class ProjectionMap extends HashMap<String, String> {
+
+    public static class Builder {
+
+        private ProjectionMap mMap = new ProjectionMap();
+
+        public Builder add(String column) {
+            mMap.putColumn(column, column);
+            return this;
+        }
+
+        public Builder add(String alias, String expression) {
+            mMap.putColumn(alias, expression + " AS " + alias);
+            return this;
+        }
+
+        public Builder addAll(ProjectionMap map) {
+            for (Map.Entry<String, String> entry : map.entrySet()) {
+                mMap.putColumn(entry.getKey(), entry.getValue());
+            }
+            return this;
+        }
+
+        public ProjectionMap build() {
+            String[] columns = new String[mMap.size()];
+            mMap.keySet().toArray(columns);
+            Arrays.sort(columns);
+            mMap.mColumns = columns;
+            return mMap;
+        }
+
+    }
+
+    private String[] mColumns;
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Returns a sorted array of all column names in the projection map.
+     */
+    public String[] getColumnNames() {
+        return mColumns;
+    }
+
+    private void putColumn(String alias, String column) {
+        super.put(alias, column);
+    }
+
+    @Override
+    public String put(String key, String value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void putAll(Map<? extends String, ? extends String> map) {
+        throw new UnsupportedOperationException();
+    }
+}