How to use

merge

method

in

org.apache.logging.log4j.util.SortedArrayStringMap

@Override
public void putAll(final ReadOnlyStringMap source) {
  if (source == this || source == null || source.isEmpty()) {
    // this.putAll(this) does not modify this collection
    // this.putAll(null) does not modify this collection
    // this.putAll(empty ReadOnlyStringMap) does not modify this collection
    return;
  }
  assertNotFrozen();
  assertNoConcurrentModification();
  if (source instanceof SortedArrayStringMap) {
    if (this.size == 0) {
      initFrom0((SortedArrayStringMap) source);
    } else {
      merge((SortedArrayStringMap) source);
    }
  } else if (source != null) {
    source.forEach(PUT_ALL, this);
  }
}

@Override
public void putAll(final ReadOnlyStringMap source) {
  if (source == this || source == null || source.isEmpty()) {
    // this.putAll(this) does not modify this collection
    // this.putAll(null) does not modify this collection
    // this.putAll(empty ReadOnlyStringMap) does not modify this collection
    return;
  }
  assertNotFrozen();
  assertNoConcurrentModification();
  if (source instanceof SortedArrayStringMap) {
    if (this.size == 0) {
      initFrom0((SortedArrayStringMap) source);
    } else {
      merge((SortedArrayStringMap) source);
    }
  } else if (source != null) {
    source.forEach(PUT_ALL, this);
  }
}