public Builder setSupportSource(boolean value) {

      supportSource_ = value;
      bitField0_ |= 0x00000004;
      onChanged();
      return this;
    }
<pre>
Can be used as a source language.
</pre>

<code>bool support_source = 3;</code>

@param value The supportSource to set.
@return This builder for chaining.
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/SupportedLanguage.java