Add Model context concept combining prefix mappings and aliases

Move alias definition class to context package

Author: simonoakesepimorphics

binary-array-ld-demo/src/main/java/net/bald/NetCdfConvertJava.java

@@ -1,7 +1,7 @@
 package net.bald;
 
 import net.bald.alias.AliasBinaryArray;
-import net.bald.alias.AliasDefinition;
+import net.bald.context.AliasDefinition;
 import net.bald.model.ModelAliasDefinition;
 import net.bald.context.ContextBinaryArray;
 import net.bald.model.ModelBinaryArrayConverter;

binary-array-ld-lib/src/main/kotlin/net/bald/alias/AliasAttribute.kt

@@ -1,8 +1,8 @@
 package net.bald.alias
 
 import net.bald.Attribute
+import net.bald.context.AliasDefinition
 import org.apache.jena.rdf.model.RDFNode
-import org.apache.jena.rdf.model.ResourceFactory
 
 /**
  * Decorator for [Attribute] which supports attribute aliasing.

binary-array-ld-lib/src/main/kotlin/net/bald/alias/AliasAttributeSource.kt

@@ -1,6 +1,7 @@
 package net.bald.alias
 
 import net.bald.*
+import net.bald.context.AliasDefinition
 import org.apache.jena.shared.PrefixMapping
 
 /**

binary-array-ld-lib/src/main/kotlin/net/bald/alias/AliasBinaryArray.kt

@@ -2,6 +2,7 @@ package net.bald.alias
 
 import net.bald.BinaryArray
 import net.bald.Container
+import net.bald.context.AliasDefinition
 import org.apache.jena.shared.PrefixMapping
 
 /**

binary-array-ld-lib/src/main/kotlin/net/bald/alias/AliasContainer.kt

@@ -2,6 +2,7 @@ package net.bald.alias
 
 import net.bald.Container
 import net.bald.Var
+import net.bald.context.AliasDefinition
 
 /**
  * Decorator for [Container] which supports attribute aliasing.

binary-array-ld-lib/src/main/kotlin/net/bald/alias/AliasVar.kt

@@ -1,6 +1,7 @@
 package net.bald.alias
 
 import net.bald.Var
+import net.bald.context.AliasDefinition
 
 /**
  * Decorator for [Var] which supports attribute aliasing.

binary-array-ld-lib/src/main/kotlin/net/bald/alias/AliasDefinition.kt renamed to binary-array-ld-lib/src/main/kotlin/net/bald/context/AliasDefinition.kt

@@ -1,4 +1,4 @@
-package net.bald.alias
+package net.bald.context
 
 import org.apache.jena.rdf.model.Property
 import org.apache.jena.rdf.model.Resource
@@ -20,4 +20,14 @@ interface AliasDefinition {
      * @return The corresponding alias, if it exists. Otherwise, null.
      */
     fun resource(identifier: String): Resource?
+
+    object Empty: AliasDefinition {
+        override fun property(identifier: String): Property? {
+            return null
+        }
+
+        override fun resource(identifier: String): Resource? {
+            return null
+        }
+    }
 }

binary-array-ld-lib/src/main/kotlin/net/bald/context/ModelContext.kt

@@ -0,0 +1,74 @@
+package net.bald.context
+
+import org.apache.jena.rdf.model.Property
+import org.apache.jena.rdf.model.Resource
+import org.apache.jena.shared.PrefixMapping
+
+/**
+ * TODO
+ * @see AliasDefinition
+ */
+interface ModelContext: AliasDefinition {
+    /**
+     * TODO
+     */
+    val prefixMapping: PrefixMapping
+
+    object Empty: ModelContext {
+        override val prefixMapping: PrefixMapping get() = PrefixMapping.Factory.create()
+        override fun property(identifier: String): Property? = null
+        override fun resource(identifier: String): Resource? = null
+    }
+
+    class Base(
+        override val prefixMapping: PrefixMapping,
+        private val alias: AliasDefinition
+    ): ModelContext {
+        override fun property(identifier: String): Property? {
+            return alias.property(identifier)
+        }
+
+        override fun resource(identifier: String): Resource? {
+            return alias.resource(identifier)
+        }
+    }
+
+    companion object {
+        /**
+         * Instantiate a wrapper for the external elements which contextualise a binary array conversion.
+         * @throws IllegalArgumentException If there are conflicting definitions in the prefix mappings.
+         * @param prefixes The contextual prefix mappings.
+         * @param alias The contextual alias definition.
+         * @return The [ModelContext].
+         */
+        @JvmStatic
+        fun create(prefixes: List<PrefixMapping>, alias: AliasDefinition? = null): ModelContext {
+            val prefix = if (prefixes.isEmpty()) {
+                PrefixMapping.Factory.create()
+            } else {
+                prefixes.reduce { acc, context ->
+                    val accKeys = acc.nsPrefixMap.keys
+                    val contextKeys = context.nsPrefixMap.keys
+                    val conflicts = accKeys.intersect(contextKeys).filterNot { prefix ->
+                        acc.getNsPrefixURI(prefix) == context.getNsPrefixURI(prefix)
+                    }
+
+                    if (conflicts.isEmpty()) {
+                        acc.setNsPrefixes(context)
+                    } else {
+                        throw IllegalArgumentException("The namespace prefixes $conflicts have conflicting definitions in contexts.")
+                    }
+                }
+            }
+            return create(prefix, alias)
+        }
+
+        /**
+         * @see create
+         */
+        @JvmStatic
+        fun create(prefix: PrefixMapping, alias: AliasDefinition? = null): ModelContext {
+            return Base(prefix, alias ?: AliasDefinition.Empty)
+        }
+    }
+}

binary-array-ld-lib/src/main/kotlin/net/bald/model/ModelAliasDefinition.kt

@@ -1,10 +1,9 @@
 package net.bald.model
 
-import net.bald.alias.AliasDefinition
+import net.bald.context.AliasDefinition
 import org.apache.jena.rdf.model.Model
 import org.apache.jena.rdf.model.Property
 import org.apache.jena.rdf.model.Resource
-import org.apache.jena.rdf.model.ResourceFactory
 import org.apache.jena.rdf.model.ResourceFactory.createProperty
 import org.apache.jena.vocabulary.DCTerms
 import org.apache.jena.vocabulary.OWL

binary-array-ld-lib/src/test/kotlin/net/bald/alias/AliasAttributeTest.kt

@@ -2,10 +2,10 @@ package net.bald.alias
 
 import com.nhaarman.mockitokotlin2.*
 import net.bald.Attribute
+import net.bald.context.AliasDefinition
 import org.apache.jena.rdf.model.RDFNode
-import org.apache.jena.rdf.model.ResourceFactory
 import org.apache.jena.rdf.model.ResourceFactory.*
-import org.junit.jupiter.api.*
+import org.junit.jupiter.api.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertNull