public Builder setSourceBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      source_ = value;
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<pre>
Required. The name of the Source.
</pre>

<code>
string source = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
</code>

@param value The bytes for source to set.
@return This builder for chaining.
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/FetchInventoryRequest.java