Add Jackson @JsonView support

Issue: SPR-14693

spring-web/src/main/java/org/springframework/http/codec/Jackson2ServerHttpMessageReader.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2002-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec;
+
+import java.util.Collections;
+import java.util.Map;
+
+import com.fasterxml.jackson.annotation.JsonView;
+
+import org.springframework.core.MethodParameter;
+import org.springframework.core.ResolvableType;
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.json.AbstractJackson2Codec;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+
+/**
+ * {@link ServerHttpMessageReader} that resolves those annotation or request based Jackson 2 hints:
+ * <ul>
+ *   <li>{@code @JsonView} + {@code @RequestBody} annotated handler method parameter</li>
+ * </ul>
+ *
+ * @author Sebastien Deleuze
+ * @since 5.0
+ * @see com.fasterxml.jackson.annotation.JsonView
+ */
+public class Jackson2ServerHttpMessageReader extends AbstractServerHttpMessageReader<Object> {
+
+	public Jackson2ServerHttpMessageReader(HttpMessageReader<Object> reader) {
+		super(reader);
+	}
+
+	@Override
+	protected Map<String, Object> resolveReadHintsInternal(ResolvableType streamType,
+			ResolvableType elementType, MediaType mediaType, ServerHttpRequest request) {
+
+		Object source = streamType.getSource();
+		MethodParameter parameter = (source instanceof MethodParameter ? (MethodParameter)source : null);
+		if (parameter != null) {
+			JsonView annotation = parameter.getParameterAnnotation(JsonView.class);
+			if (annotation != null) {
+				Class<?>[] classes = annotation.value();
+				if (classes.length != 1) {
+					throw new IllegalArgumentException(
+							"@JsonView only supported for read hints with exactly 1 class argument: " + parameter);
+				}
+				return Collections.singletonMap(AbstractJackson2Codec.JSON_VIEW_HINT, classes[0]);
+			}
+		}
+		return Collections.emptyMap();
+	}
+
+}

spring-web/src/main/java/org/springframework/http/codec/Jackson2ServerHttpMessageWriter.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2002-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec;
+
+import java.util.Collections;
+import java.util.Map;
+
+import com.fasterxml.jackson.annotation.JsonView;
+
+import org.springframework.core.MethodParameter;
+import org.springframework.core.ResolvableType;
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.json.AbstractJackson2Codec;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+
+/**
+ * {@link ServerHttpMessageWriter} that resolves those annotation or request based Jackson 2 hints:
+ * <ul>
+ *   <li>{@code @JsonView} annotated handler method</li>
+ * </ul>
+ *
+ * @author Sebastien Deleuze
+ * @since 5.0
+ * @see com.fasterxml.jackson.annotation.JsonView
+ */
+public class Jackson2ServerHttpMessageWriter extends AbstractServerHttpMessageWriter<Object> {
+
+	public Jackson2ServerHttpMessageWriter(HttpMessageWriter<Object> writer) {
+		super(writer);
+	}
+
+	@Override
+	protected Map<String, Object> resolveWriteHintsInternal(ResolvableType streamType,
+			ResolvableType elementType, MediaType mediaType, ServerHttpRequest request) {
+
+		Object source = streamType.getSource();
+		MethodParameter returnValue = (source instanceof MethodParameter ? (MethodParameter)source : null);
+		if (returnValue != null) {
+			JsonView annotation = returnValue.getMethodAnnotation(JsonView.class);
+			if (annotation != null) {
+				Class<?>[] classes = annotation.value();
+				if (classes.length != 1) {
+					throw new IllegalArgumentException(
+							"@JsonView only supported for write hints with exactly 1 class argument: " + returnValue);
+				}
+				return Collections.singletonMap(AbstractJackson2Codec.JSON_VIEW_HINT, classes[0]);
+			}
+		}
+		return Collections.emptyMap();
+	}
+
+}