[GitHub] [iotdb] HTHou commented on a change in pull request #5118: [IOTDB-2609] A new lossy encoding method based on frequency domain

[GitBox <gi...@apache.org>]

HTHou commented on a change in pull request #5118:
URL: https://github.com/apache/iotdb/pull/5118#discussion_r815241047



##########
File path: tsfile/src/main/java/org/apache/iotdb/tsfile/utils/BitConstructor.java
##########
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2021 The Apache Software Foundation.
+ *
+ * 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 org.apache.iotdb.tsfile.utils;
+
+import org.eclipse.collections.impl.list.mutable.primitive.ByteArrayList;
+
+/**
+ * 大端，低字节存储高位
+ *
+ * @author Wang Haoyu
+ */
+public class BitConstructor {
+
+  private static final int BITS_IN_A_BYTE = 8;
+  private static final long ALL_MASK = -1;
+  private final ByteArrayList data;
+  private byte cache = 0;
+  private int cnt = 0;
+
+  public BitConstructor() {
+    this.data = new ByteArrayList();
+  }
+
+  public BitConstructor(int initialCapacity) {
+    this.data = new ByteArrayList(initialCapacity);
+  }
+
+  public void add(long x, int len) {
+    x = x & ~(ALL_MASK << len); // 保证x除最低的len位之外都是0

Review comment:
       Use english?




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