Initial checkin of AOSP Messaging app.

b/23110861

Change-Id: I9aa980d7569247d6b2ca78f5dcb4502e1eaadb8a

src/com/android/messaging/util/ConversationIdSet.java

@@ -0,0 +1,69 @@
+/*
+ * 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.util;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashSet;
+
+/**
+ * Utility class to make it easy to store multiple conversation id strings in a single string
+ * with delimeters.
+ */
+public class ConversationIdSet extends HashSet<String> {
+    private static final String JOIN_DELIMITER = "|";
+    private static final String SPLIT_DELIMITER = "\\|";
+
+    public ConversationIdSet() {
+        super();
+    }
+
+    public ConversationIdSet(final Collection<String> asList) {
+        super(asList);
+    }
+
+    public String first() {
+        if (size() > 0) {
+            return iterator().next();
+        } else {
+            return null;
+        }
+    }
+
+    public static ConversationIdSet createSet(final String conversationIdSetString) {
+        ConversationIdSet set = null;
+        if (conversationIdSetString != null) {
+            set = new ConversationIdSet(Arrays.asList(conversationIdSetString.split(
+                    SPLIT_DELIMITER)));
+        }
+        return set;
+    }
+
+    public String getDelimitedString() {
+        return OsUtil.joinFromSetWithDelimiter(this, JOIN_DELIMITER);
+    }
+
+    public static String join(final String conversationIdSet1, final String conversationIdSet2) {
+        String joined = null;
+        if (conversationIdSet1 == null) {
+            joined = conversationIdSet2;
+        } else if (conversationIdSet2 != null) {
+            joined = conversationIdSet1 + JOIN_DELIMITER + conversationIdSet2;
+        }
+        return joined;
+    }
+
+}