public Builder setContent(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      sourceCase_ = 1;
      source_ = value;
      onChanged();
      return this;
    }
<pre>
The content of the input stored as a string.
</pre>

<code>string content = 1;</code>

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