+ * Answers true if this object is either equivalent to, or can be 'improved'
+ * by, the given entry. Specifically, answers true if
+ * <ul>
+ * <li>source and accession are identical (ignoring case)</li>
+ * <li>version is identical (ignoring case), or this version is of the format
+ * "someSource:0", in which case the version for the other entry replaces
+ * it</li>
+ * <li>mappings are not compared but if this entry has no mapping, replace
+ * with that for the other entry</li>
+ * </ul>
+ *
+ * @param other
+ * @return
+ */
+ @Override
+ public boolean updateFrom(DBRefEntryI other)
+ {
+ if (other == null)
+ {
+ return false;
+ }
+ if (other == this)
+ {
+ return true;
+ }
+
+ /*
+ * source must either match or be both null
+ */
+ String otherSource = other.getSource();
+ if ((source == null && otherSource != null)
+ || (source != null && otherSource == null)
+ || (source != null && !source.equalsIgnoreCase(otherSource)))
+ {
+ return false;
+ }
+
+ /*
+ * accession id must either match or be both null
+ */
+ String otherAccession = other.getAccessionId();
+ if ((accessionId == null && otherAccession != null)
+ || (accessionId != null && otherAccession == null)
+ || (accessionId != null
+ && !accessionId.equalsIgnoreCase(otherAccession)))
+ {
+ return false;
+ }
+
+ /*
+ * if my version is null, "0" or "source:0" then replace with other version,
+ * otherwise the versions have to match
+ */
+ String otherVersion = other.getVersion();
+
+ if ((version == null || version.equals("0") || version.endsWith(":0"))
+ && otherVersion != null)
+ {
+ setVersion(otherVersion);
+ }
+ else
+ {
+ if (version != null && (otherVersion == null
+ || !version.equalsIgnoreCase(otherVersion)))
+ {
+ return false;
+ }
+ }
+
+ /*
+ * if I have no mapping, take that of the other dbref
+ */
+ if (map == null)
+ {
+ setMap(other.getMap());
+ }
+ return true;
+ }
+
+ /**