1 files changed, 56 insertions, 0 deletions
diff --git a/java/src/com/android/inputmethod/latin/StringBuilderPool.java b/java/src/com/android/inputmethod/latin/StringBuilderPool.java
new file mode 100644
index 000000000..66f123731
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/StringBuilderPool.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2011 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.inputmethod.latin;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * A pool of string builders to be used from anywhere.
+ */
+public class StringBuilderPool {
+    // Singleton
+    private static final StringBuilderPool sInstance = new StringBuilderPool();
+    private StringBuilderPool() {}
+    // TODO: Make this a normal array with a size of 20
+    private final List<StringBuilder> mPool =
+            Collections.synchronizedList(new ArrayList<StringBuilder>());
+
+    public static StringBuilder getStringBuilder(final int initialSize) {
+        final int poolSize = sInstance.mPool.size();
+        final StringBuilder sb = poolSize > 0 ? (StringBuilder) sInstance.mPool.remove(poolSize - 1)
+                : new StringBuilder(initialSize);
+        sb.setLength(0);
+        return sb;
+    }
+
+    public static void recycle(final StringBuilder garbage) {
+        sInstance.mPool.add(garbage);
+    }
+
+    public static void ensureCapacity(final int capacity, final int initialSize) {
+        for (int i = sInstance.mPool.size(); i < capacity; ++i) {
+            final StringBuilder sb = new StringBuilder(initialSize);
+            sInstance.mPool.add(sb);
+        }
+    }
+
+    public static int getSize() {
+        return sInstance.mPool.size();
+    }
+}