Remove recursion in protobuf data

1 files changed, 43 insertions, 0 deletions

diff --git a/spark-common/src/main/java/me/lucko/spark/common/util/IndexedListBuilder.java b/spark-common/src/main/java/me/lucko/spark/common/util/IndexedListBuilder.java
new file mode 100644
index 0000000..b2315f9
--- /dev/null
+++ b/spark-common/src/main/java/me/lucko/spark/common/util/IndexedListBuilder.java
@@ -0,0 +1,43 @@
+/*
+ * This file is part of spark.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package me.lucko.spark.common.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * List builder that returns the index of the inserted element.
+ *
+ * @param <T> generic type
+ */
+public class IndexedListBuilder<T> {
+    private int i = 0;
+    private final List<T> nodes = new ArrayList<>();
+
+    public int add(T node) {
+        this.nodes.add(node);
+        return this.i++;
+    }
+
+    public List<T> build() {
+        return this.nodes;
+    }
+}