tez-api/src/main/java/org/apache/tez/common/Preconditions.java [67:105]:
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  private static String format(@Nullable String template, @Nullable Object... args) {
    template = String.valueOf(template); // null -> "null"

    if (args == null) {
      args = new Object[] { "(Object[])null" };
    } else {
      for (int i = 0; i < args.length; i++) {
        args[i] = lenientToString(args[i]);
      }
    }

    // start substituting the arguments into the '%s' placeholders
    StringBuilder builder = new StringBuilder(template.length() + 16 * args.length);
    int templateStart = 0;
    int i = 0;
    while (i < args.length) {
      int placeholderStart = template.indexOf("%s", templateStart);
      if (placeholderStart == -1) {
        break;
      }
      builder.append(template, templateStart, placeholderStart);
      builder.append(args[i++]);
      templateStart = placeholderStart + 2;
    }
    builder.append(template, templateStart, template.length());

    // if we run out of placeholders, append the extra args in square braces
    if (i < args.length) {
      builder.append(" [");
      builder.append(args[i++]);
      while (i < args.length) {
        builder.append(", ");
        builder.append(args[i++]);
      }
      builder.append(']');
    }

    return builder.toString();
  }
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tez-common/src/main/java/org/apache/tez/common/Preconditions.java [68:106]:
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  private static String format(@Nullable String template, @Nullable Object... args) {
    template = String.valueOf(template); // null -> "null"

    if (args == null) {
      args = new Object[] { "(Object[])null" };
    } else {
      for (int i = 0; i < args.length; i++) {
        args[i] = lenientToString(args[i]);
      }
    }

    // start substituting the arguments into the '%s' placeholders
    StringBuilder builder = new StringBuilder(template.length() + 16 * args.length);
    int templateStart = 0;
    int i = 0;
    while (i < args.length) {
      int placeholderStart = template.indexOf("%s", templateStart);
      if (placeholderStart == -1) {
        break;
      }
      builder.append(template, templateStart, placeholderStart);
      builder.append(args[i++]);
      templateStart = placeholderStart + 2;
    }
    builder.append(template, templateStart, template.length());

    // if we run out of placeholders, append the extra args in square braces
    if (i < args.length) {
      builder.append(" [");
      builder.append(args[i++]);
      while (i < args.length) {
        builder.append(", ");
        builder.append(args[i++]);
      }
      builder.append(']');
    }

    return builder.toString();
  }
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