Add a ParamConverterProvider for array support

core-server/src/main/java/org/glassfish/jersey/server/internal/inject/ArrayExtractor.java

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2021 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0, which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the
+ * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
+ * version 2 with the GNU Classpath Exception, which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ */
+
+package org.glassfish.jersey.server.internal.inject;
+
+import java.lang.reflect.Array;
+import java.util.List;
+import java.util.function.Function;
+
+import javax.ws.rs.core.MultivaluedHashMap;
+import javax.ws.rs.core.MultivaluedMap;
+import javax.ws.rs.ext.ParamConverter;
+
+/**
+ * Extract parameter value as an array.
+ *
+ */
+class ArrayExtractor implements MultivaluedParameterExtractor<Object> {
+
+    private final String parameterName;
+    private final String defaultValueString;
+    private final Function<String, Object> typeExtractor;
+    private final Class<?> type;
+
+    private ArrayExtractor(Class<?> type, Function<String, Object> typeExtractor,
+            String parameterName, String defaultValueString) {
+        this.type = type;
+        this.typeExtractor = typeExtractor;
+        this.parameterName = parameterName;
+        this.defaultValueString = defaultValueString;
+    }
+
+    @Override
+    public String getName() {
+        return parameterName;
+    }
+
+    @Override
+    public String getDefaultValueString() {
+        return defaultValueString;
+    }
+
+    @Override
+    public Object extract(MultivaluedMap<String, String> parameters) {
+        List<String> stringList = parameters.get(getName());
+        Object array = null;
+        if (stringList != null) {
+            array = Array.newInstance(type, stringList.size());
+            for (int i = 0; i < stringList.size(); i++) {
+                Array.set(array, i, typeExtractor.apply(stringList.get(i)));
+            }
+        } else if (defaultValueString != null) {
+            array = Array.newInstance(type, 1);
+            Array.set(array, 0, typeExtractor.apply(defaultValueString));
+        } else {
+            array = Array.newInstance(type, 0);
+        }
+        return array;
+    }
+
+    /**
+     * Get array extractor instance supporting.
+     *
+     * @param type           the type class to manage runtime generic.
+     * @param converter  the converter of the type.
+     * @param parameterName  extracted parameter name.
+     * @param defaultValueString   default parameter value.
+     * @return string array extractor instance.
+     */
+    public static MultivaluedParameterExtractor<Object> getInstance(Class<?> type,
+            ParamConverter<?> converter, String parameterName, String defaultValueString) {
+        Function<String, Object> typeExtractor = value -> converter.fromString(value);
+        return new ArrayExtractor(type, typeExtractor, parameterName, defaultValueString);
+    }
+
+    /**
+     * Get array extractor instance supporting.
+     *
+     * @param type           the type class to manage runtime generic.
+     * @param extractor  the extractor.
+     * @param parameterName  extracted parameter name.
+     * @param defaultValueString   default parameter value.
+     * @return string array extractor instance.
+     */
+    public static MultivaluedParameterExtractor<Object> getInstance(Class<?> type,
+            MultivaluedParameterExtractor<?> extractor,
+            String parameterName,
+            String defaultValueString) {
+        Function<String, Object> typeExtractor = value -> {
+            MultivaluedMap<String, String> pair = new MultivaluedHashMap<>();
+            pair.putSingle(parameterName, value);
+            return extractor.extract(pair);
+        };
+        return new ArrayExtractor(type, typeExtractor, parameterName, defaultValueString);
+    }
+}

core-server/src/main/java/org/glassfish/jersey/server/internal/inject/MultivaluedParameterExtractorFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, 2019 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 2021 Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2018 Payara Foundation and/or its affiliates.
  *
  * This program and the accompanying materials are made available under the
@@ -25,19 +25,18 @@
 import java.util.Set;
 import java.util.SortedSet;
 
+import javax.inject.Singleton;
 import javax.ws.rs.ProcessingException;
 import javax.ws.rs.ext.ParamConverter;
 
-import javax.inject.Singleton;
-
 import org.glassfish.jersey.internal.inject.ExtractorException;
 import org.glassfish.jersey.internal.inject.ParamConverterFactory;
+import org.glassfish.jersey.internal.inject.PrimitiveMapper;
 import org.glassfish.jersey.internal.util.ReflectionHelper;
 import org.glassfish.jersey.internal.util.collection.ClassTypePair;
 import org.glassfish.jersey.internal.util.collection.LazyValue;
-import org.glassfish.jersey.server.internal.LocalizationMessages;
 import org.glassfish.jersey.model.Parameter;
-import org.glassfish.jersey.internal.inject.PrimitiveMapper;
+import org.glassfish.jersey.server.internal.LocalizationMessages;
 
 /**
  * Implementation of {@link MultivaluedParameterExtractorProvider}. For each
@@ -120,8 +119,30 @@ private MultivaluedParameterExtractor<?> process(
                     throw new ProcessingException(LocalizationMessages.ERROR_PARAMETER_TYPE_PROCESSING(rawType), e);
                 }
             }
+        } else if (rawType.isArray()) {
+            if (rawType.getComponentType().isPrimitive()) {
+                MultivaluedParameterExtractor<?> primitiveExtractor =
+                        createPrimitiveExtractor(rawType.getComponentType(), parameterName, defaultValue);
+                if (primitiveExtractor == null) {
+                    return null;
+                }
+                return ArrayExtractor.getInstance(rawType.getComponentType(), primitiveExtractor, parameterName, defaultValue);
+            } else {
+                converter = paramConverterFactory.getConverter(rawType.getComponentType(),
+                        rawType.getComponentType(),
+                        annotations);
+                if (converter == null) {
+                    return null;
+                }
+                return ArrayExtractor.getInstance(rawType.getComponentType(), converter, parameterName, defaultValue);
+            }
         }
+        // Check primitive types.
+        return createPrimitiveExtractor(rawType, parameterName, defaultValue);
+    }
 
+    private MultivaluedParameterExtractor<?> createPrimitiveExtractor(Class<?> rawType, String parameterName,
+            String defaultValue){
         // Check primitive types.
         if (rawType == String.class) {
             return new SingleStringValueExtractor(parameterName, defaultValue);
@@ -157,7 +178,6 @@ private MultivaluedParameterExtractor<?> process(
             }
 
         }
-
         return null;
     }
 }