@java.lang.Override public com.google.devtools.cloudtrace.v1.Trace buildPartial() { com.google.devtools.cloudtrace.v1.Trace result = new com.google.devtools.cloudtrace.v1.Trace(this); int from_bitField0_ = bitField0_; int to_bitField0_ = 0; result.projectId_ = projectId_; result.traceId_ = traceId_; if (spansBuilder_ == null) { if (((bitField0_ & 0x00000004) == 0x00000004)) { spans_ = java.util.Collections.unmodifiableList(spans_); bitField0_ = (bitField0_ & ~0x00000004); } result.spans_ = spans_; } else { result.spans_ = spansBuilder_.build(); } result.bitField0_ = to_bitField0_; onBuilt(); return result; }