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src/share/ob_truncated_string.h

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+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#ifndef OCEANBAE_LIB_OB_TRUNCATED_STRING_H_
+#define OCEANBAE_LIB_OB_TRUNCATED_STRING_H_
+
+#include "lib/string/ob_string.h"
+#include "share/config/ob_server_config.h"
+
+namespace oceanbase {
+namespace common {
+
+class ObTruncatedString {
+  public:
+  ObTruncatedString(const ObString& str, const int32_t limit)
+  {
+    const int32_t len = (limit < str.length()) ? (limit < 0 ? 0 : limit) : str.length();
+    str_ = ObString(len, str.ptr());
+  }
+
+  explicit ObTruncatedString(const ObString& str)
+  {
+    const int32_t len = (GCONF.max_string_print_length < str.length())
+                            ? static_cast<int32_t>(GCONF.max_string_print_length)
+                            : str.length();
+    str_ = ObString(len, str.ptr());
+  }
+  inline int32_t length() const
+  {
+    return str_.length();
+  }
+  inline int32_t size() const
+  {
+    return str_.size();
+  }
+  inline const char* ptr() const
+  {
+    return str_.ptr();
+  }
+  inline const ObString& string() const
+  {
+    return str_;
+  }
+
+  int64_t to_string(char* buf, const int64_t len) const
+  {
+    int64_t pos = 0;
+    if (OB_ISNULL(buf) || len <= 0) {
+      // do nothing
+    } else {
+      pos = str_.to_string(buf, len);
+    }
+    return pos;
+  }
+
+  private:
+  ObString str_;
+
+  DISALLOW_COPY_AND_ASSIGN(ObTruncatedString);
+};
+
+}  // namespace common
+}  // namespace oceanbase
+
+#endif  // OCEANBAE_LIB_OB_TRUNCATED_STRING_H_