dap4/d4cdm/src/main/java/dap4/cdm/NodeMap.java
public void put(CDM_T cdm, DAP_T dap)
    {
        assert (dap != null && cdm != null);
        cdm = (CDM_T)CDMNode.unwrap(cdm);
        int lh = cdm.localhash();
        dapmap.put(lh, dap);
        cdmmap.put(dap, cdm);
    }
public void put(CDM_T cdm, DAP_T dap)
    {
        assert (dap != null && cdm != null);
        cdm = (CDM_T)CDMNode.unwrap(cdm);
        int lh = cdm.localhash();
        dapmap.put(lh, dap);
        cdmmap.put(dap, cdm);
    }
Given a CDM_T <-> DAP_T pair, insert
into the maps

@param cdm
@param dap