feat: Add asObjectMap to get the EvaluationContext as Map<String,Object> (#75)

* Add asObjectMap to get the EvaluationContext as Map<String,Object>

Signed-off-by: Thomas Poignant <thomas.poignant@gofeatureflag.org>

* Fix liniting issue

Signed-off-by: Thomas Poignant <thomas.poignant@gofeatureflag.org>

* fix PMD issue

Signed-off-by: Thomas Poignant <thomas.poignant@gofeatureflag.org>

Signed-off-by: Thomas Poignant <thomas.poignant@gofeatureflag.org>

src/main/java/dev/openfeature/javasdk/Structure.java

@@ -1,11 +1,10 @@
 package dev.openfeature.javasdk;
 
 import java.time.Instant;
-import java.util.HashMap;
+import java.util.*;
-import java.util.List;
+import java.util.stream.Collectors;
-import java.util.Map;
-import java.util.Set;
 
+import dev.openfeature.javasdk.exceptions.ValueNotConvertableError;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -96,4 +95,67 @@ public class Structure {
     public Map<String, Value> asMap() {
         return new HashMap<>(this.attributes);
     }
+
+    /**
+     * Get all values, with primitives types.
+     *
+     * @return all attributes on the structure into a Map
+     */
+    public Map<String, Object> asObjectMap() {
+        return attributes
+            .entrySet()
+            .stream()
+            .collect(Collectors.toMap(
+                Map.Entry::getKey,
+                e -> convertValue(getValue(e.getKey()))
+            ));
+    }
+
+    /**
+     * convertValue is converting the object type Value in a primitive type.
+     * @param value - Value object to convert
+     * @return an Object containing the primitive type.
+     */
+    private Object convertValue(Value value) {
+        if (value.isBoolean()) {
+            return value.asBoolean();
+        }
+
+        if (value.isNumber()) {
+            Double valueAsDouble = value.asDouble();
+            if (valueAsDouble == Math.floor(valueAsDouble) && !Double.isInfinite(valueAsDouble)) {
+                return value.asInteger();
+            }
+            return valueAsDouble;
+        }
+
+        if (value.isString()) {
+            return value.asString();
+        }
+
+        if (value.isInstant()) {
+            return value.asInstant();
+        }
+
+        if (value.isList()) {
+            return value.asList()
+                    .stream()
+                    .map(this::convertValue)
+                    .collect(Collectors.toList());
+        }
+
+        if (value.isStructure()) {
+            Structure s = value.asStructure();
+            return s.asMap()
+                    .keySet()
+                    .stream()
+                    .collect(
+                        Collectors.toMap(
+                            key -> key,
+                            key -> convertValue(s.getValue(key))
+                        )
+                    );
+        }
+        throw new ValueNotConvertableError();
+    }
 }

src/main/java/dev/openfeature/javasdk/exceptions/ValueNotConvertableError.java

@@ -0,0 +1,12 @@
+package dev.openfeature.javasdk.exceptions;
+
+import dev.openfeature.javasdk.ErrorCode;
+import lombok.Getter;
+import lombok.experimental.StandardException;
+
+@StandardException
+public class ValueNotConvertableError extends OpenFeatureError {
+    private static final long serialVersionUID = 1L;
+    @Getter
+    private final ErrorCode errorCode = ErrorCode.GENERAL;
+}

src/test/java/dev/openfeature/javasdk/EvalContextTest.java

@@ -4,6 +4,7 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import java.time.Instant;
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -148,4 +149,55 @@ public class EvalContextTest {
         ctxMerged = EvaluationContext.merge(ctx1, ctx2);
         assertEquals(key1, ctxMerged.getTargetingKey());
     }
+
+    @Test void asObjectMap() {
+        String key1 = "key1";
+        EvaluationContext ctx = new EvaluationContext(key1);
+        ctx.add("stringItem", "stringValue");
+        ctx.add("boolItem", false);
+        ctx.add("integerItem", 1);
+        ctx.add("doubleItem", 1.2);
+        ctx.add("instantItem",  Instant.ofEpochSecond(1663331342));
+        List<Value> listItem = new ArrayList<>();
+        listItem.add(new Value("item1"));
+        listItem.add(new Value("item2"));
+        ctx.add("listItem", listItem);
+        List<Value> listItem2 = new ArrayList<>();
+        listItem2.add(new Value(true));
+        listItem2.add(new Value(false));
+        ctx.add("listItem2", listItem2);
+        Map<String, Value> structureValue = new HashMap<>();
+        structureValue.put("structStringItem", new Value("stringValue"));
+        structureValue.put("structBoolItem", new Value(false));
+        structureValue.put("structIntegerItem", new Value(1));
+        structureValue.put("structDoubleItem", new Value(1.2));
+        structureValue.put("structInstantItem",  new Value(Instant.ofEpochSecond(1663331342)));
+        Structure structure = new Structure(structureValue);
+        ctx.add("structureItem", structure);
+
+
+        Map<String, Object> want = new HashMap<>();
+        want.put("stringItem", "stringValue");
+        want.put("boolItem", false);
+        want.put("integerItem", 1);
+        want.put("doubleItem", 1.2);
+        want.put("instantItem",  Instant.ofEpochSecond(1663331342));
+        List<String> wantListItem = new ArrayList<>();
+        wantListItem.add("item1");
+        wantListItem.add("item2");
+        want.put("listItem", wantListItem);
+        List<Boolean> wantListItem2 = new ArrayList<>();
+        wantListItem2.add(true);
+        wantListItem2.add(false);
+        want.put("listItem2", wantListItem2);
+        Map<String, Object> wantStructureValue = new HashMap<>();
+        wantStructureValue.put("structStringItem", "stringValue");
+        wantStructureValue.put("structBoolItem", false);
+        wantStructureValue.put("structIntegerItem", 1);
+        wantStructureValue.put("structDoubleItem", 1.2);
+        wantStructureValue.put("structInstantItem",  Instant.ofEpochSecond(1663331342));
+        want.put("structureItem",wantStructureValue);
+
+        assertEquals(want,ctx.asObjectMap());
+    }
 }