[Enhancement #43] Support chaining JSON-LD contexts into hierarchy.

kbss-cvut · Feb 7, 2023 · 37ad993 · 37ad993
1 parent 91131d8
commit 37ad993
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Showing 2 changed files with 42 additions and 2 deletions.
diff --git a/src/main/java/cz/cvut/kbss/jsonld/serialization/context/MappingJsonLdContext.java b/src/main/java/cz/cvut/kbss/jsonld/serialization/context/MappingJsonLdContext.java
@@ -20,6 +20,16 @@ public class MappingJsonLdContext implements JsonLdContext {
 
     private final Map<String, JsonNode> mapping = new HashMap<>();
 
+    private final JsonLdContext parentContext;
+
+    public MappingJsonLdContext() {
+        this.parentContext = new DummyJsonLdContext();
+    }
+
+    public MappingJsonLdContext(JsonLdContext parentContext) {
+        this.parentContext = parentContext;
+    }
+
     /**
      * Registers the specified term mapping in this context.
      * <p>
@@ -67,12 +77,12 @@ Map<String, JsonNode> getMapping() {
     }
 
     public Optional<JsonNode> getTermMapping(String term) {
-        return Optional.ofNullable(mapping.get(term));
+        return mapping.containsKey(term) ? Optional.of(mapping.get(term)) : parentContext.getTermMapping(term);
     }
 
     @Override
     public boolean hasTermMapping(String term) {
-        return mapping.containsKey(term);
+        return mapping.containsKey(term) || parentContext.hasTermMapping(term);
     }
 
     @Override

diff --git a/src/test/java/cz/cvut/kbss/jsonld/serialization/context/MappingJsonLdContextTest.java b/src/test/java/cz/cvut/kbss/jsonld/serialization/context/MappingJsonLdContextTest.java
@@ -1,9 +1,12 @@
 package cz.cvut.kbss.jsonld.serialization.context;
 
 import cz.cvut.kbss.jopa.vocabulary.DC;
+import cz.cvut.kbss.jopa.vocabulary.RDFS;
 import cz.cvut.kbss.jopa.vocabulary.XSD;
 import cz.cvut.kbss.jsonld.JsonLd;
 import cz.cvut.kbss.jsonld.environment.Generator;
+import cz.cvut.kbss.jsonld.serialization.JsonNodeFactory;
+import cz.cvut.kbss.jsonld.serialization.model.JsonNode;
 import cz.cvut.kbss.jsonld.serialization.serializer.SerializerUtils;
 import org.junit.jupiter.api.Test;
 
@@ -43,4 +46,31 @@ void getMappedTermReturnsEmptyOptionalWhenNoMatchingMappingIsRegistered() {
         assertNotNull(result);
         assertFalse(result.isPresent());
     }
+
+    @Test
+    void getTermMappingRetrievesMappingFromParentContextWhenAvailable() {
+        sut.registerTermMapping("id", JsonLd.ID);
+        final MappingJsonLdContext currentSut = new MappingJsonLdContext(sut);
+        final Optional<JsonNode> result = currentSut.getTermMapping("id");
+        assertTrue(result.isPresent());
+        assertEquals(JsonNodeFactory.createStringLiteralNode("id", JsonLd.ID), result.get());
+    }
+
+    @Test
+    void getTermMappingReturnsMappingFromCurrentContextThatOverridesParentMapping() {
+        final String term = "name";
+        sut.registerTermMapping(term, RDFS.LABEL);
+        final MappingJsonLdContext currentSut = new MappingJsonLdContext(sut);
+        currentSut.registerTermMapping(term, DC.Terms.TITLE);
+        final Optional<JsonNode> result = currentSut.getTermMapping(term);
+        assertTrue(result.isPresent());
+        assertEquals(JsonNodeFactory.createStringLiteralNode(term, DC.Terms.TITLE), result.get());
+    }
+
+    @Test
+    void hasTermMappingReturnsTrueWhenTermIsMappedInParentContext() {
+        sut.registerTermMapping("id", JsonLd.ID);
+        final MappingJsonLdContext currentSut = new MappingJsonLdContext(sut);
+        assertTrue(currentSut.hasTermMapping("id"));
+    }
 }