introduced concept of enrichment providers in the identifier creation strategy

src/main/java/eu/dnetlib/dhp/schema/common/ModelConstants.java

@@ -30,6 +30,9 @@ public class ModelConstants {
 	public static final String OPENOCITATIONS_NAME = "OpenCitations";
 	public static final String OPENOCITATIONS_ID = "10|openaire____::c06df618c5de1c786535ccf3f8b7b059";
 
+	public static final String OPEN_APC_NAME = "OpenAPC Initiative";
+	public static final String OPEN_APC_ID = "10|openaire____::96c67b8f18814e8428a958028cf5bcc1";
+
 	// VOCABULARY VALUE
 	public static final String ACCESS_RIGHT_OPEN = "OPEN";
 	public static final String ACCESS_RIGHT_EMBARGO = "EMBARGO";

src/main/java/eu/dnetlib/dhp/schema/oaf/utils/IdentifierFactory.java

@@ -67,6 +67,18 @@ public class IdentifierFactory implements Serializable {
 		DELEGATED_PID_AUTHORITY.get(PidType.doi).put(ZENODO_R3_ID, "zenodo");
 	}
 
+	/**
+	 * Declares the associations PID_TYPE -> [DATASOURCE ID, NAME] whose records are considered enrichment for the graph.
+	 * Their OpenAIRE ID is built from the declared PID type. Are merged with their corresponding record, identified by
+	 * the same OpenAIRE id.
+	 */
+	public static final Map<PidType, HashBiMap<String, String>> ENRICHMENT_PROVIDER = Maps.newHashMap();
+
+	static {
+		ENRICHMENT_PROVIDER.put(PidType.doi, HashBiMap.create());
+		ENRICHMENT_PROVIDER.get(PidType.doi).put(OPEN_APC_ID, OPEN_APC_NAME);
+	}
+
 	public static Set<String> delegatedAuthorityDatasourceIds() {
 		return DELEGATED_PID_AUTHORITY.values()
 				.stream()
@@ -184,23 +196,34 @@ public class IdentifierFactory implements Serializable {
 					.stream()
 					// filter away PIDs provided by a DS that is not considered an authority for the
 					// given PID Type
-					.filter(p -> shouldFilterPidByAuthority(collectedFrom, p, mapHandles))
+					.filter(p -> shouldFilterPidByCriteria(collectedFrom, p, mapHandles))
 					.map(CleaningFunctions::normalizePidValue)
 					.filter(p -> isNotFromDelegatedAuthority(collectedFrom, p))
 					.filter(CleaningFunctions::pidFilter))
 			.orElse(Stream.empty());
 	}
 
-	private static boolean shouldFilterPidByAuthority(KeyValue collectedFrom, StructuredProperty p, boolean mapHandles) {
+
+	private static boolean shouldFilterPidByCriteria(KeyValue collectedFrom, StructuredProperty p, boolean mapHandles) {
 		final PidType pType = PidType.tryValueOf(p.getQualifier().getClassid());
-		return (mapHandles && pType.equals(PidType.handle)) || Optional.ofNullable(collectedFrom).isPresent() &&
-			Optional
+
+		if (Objects.isNull(collectedFrom)) {
+			return false;
+		}
+
+		boolean isEnrich = Optional
+				.ofNullable(ENRICHMENT_PROVIDER.get(pType))
+				.map(enrich -> enrich.containsKey(collectedFrom.getKey())
+						|| enrich.containsValue(collectedFrom.getValue()))
+				.orElse(false);
+
+		boolean isAuthority = Optional
 				.ofNullable(PID_AUTHORITY.get(pType))
-				.map(authorities -> {
-					return authorities.containsKey(collectedFrom.getKey())
-							|| authorities.containsValue(collectedFrom.getValue());
-				})
+				.map(authorities -> authorities.containsKey(collectedFrom.getKey())
+						|| authorities.containsValue(collectedFrom.getValue()))
 				.orElse(false);
+
+		return (mapHandles && pType.equals(PidType.handle)) || isEnrich || isAuthority;
 	}
 
 	private static boolean isNotFromDelegatedAuthority(KeyValue collectedFrom, StructuredProperty p) {

src/test/java/eu/dnetlib/dhp/schema/oaf/utils/IdentifierFactoryTest.java

@@ -43,6 +43,9 @@ class IdentifierFactoryTest {
 		verifyIdentifier(
 			"publication_pmc2.json", "50|pmc_________::94e4cb08c93f8733b48e2445d04002ac", true);
 
+		verifyIdentifier(
+				"publication_openapc.json", "50|doi_________::79dbc7a2a56dc1532659f9038843256e", true);
+
 		final String defaultID = "50|DansKnawCris::0829b5191605bdbea36d6502b8c1ce1f";
 		verifyIdentifier("publication_3.json", defaultID, true);
 		verifyIdentifier("publication_4.json", defaultID, true);

src/test/resources/eu/dnetlib/dhp/schema/oaf/utils/publication_openapc.json

@@ -0,0 +1,28 @@
+{
+  "id": "50|openapc_____::000023f9cb6e3a247c764daec4273cbc",
+  "resuttype": {
+    "classid": "publication"
+  },
+  "instance": [
+    {
+      "collectedfrom": {
+        "key": "10|openaire____::96c67b8f18814e8428a958028cf5bcc1",
+        "value": "OpenAPC Initiative"
+      },
+      "pid": [
+        {
+          "qualifier": {"classid": "doi"},
+          "value": "10.1016/j.cmet.2010.03.013"
+        },
+        {
+          "qualifier": {"classid": "pmc"},
+          "value": "21459329"
+        },
+        {
+          "qualifier": {"classid": "pmid"},
+          "value": "25811027"
+        }
+      ]
+    }
+  ]
+}