SPR-7354 - Added equivalent of JAX-RS @Consumes to Spring MVC

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/mvc/method/condition/AbstractNameValueCondition.java

@@ -66,7 +66,7 @@ abstract class AbstractNameValueCondition<T> extends AbstractRequestCondition {
 	protected abstract boolean matchValue(HttpServletRequest request);
 
 	@Override
-	public int getWeight() {
+	public int getSpecificity() {
 		return 1;
 	}
 

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/mvc/method/condition/AbstractRequestCondition.java

@@ -17,18 +17,25 @@
 package org.springframework.web.servlet.mvc.method.condition;
 
 /**
- * Abstract base class for {@link RequestCondition} that provides a standard {@link Comparable} implementation.
+ * Abstract base class for {@link RequestCondition} that provides a standard {@link Comparable} implementation based on
+ * the conditions {@linkplain #getSpecificity() specificity}.
  *
  * @author Arjen Poutsma
  * @since 3.1
  */
 public abstract class AbstractRequestCondition implements RequestCondition {
 
-	public abstract int getWeight();
+	/**
+	 * Returns the conditions specificity. More specific conditions should return a higher value than ones which are less
+	 * so.
+	 *
+	 * @return the conditions specificity
+	 */
+	protected abstract int getSpecificity();
 
 	public int compareTo(RequestCondition o) {
 		AbstractRequestCondition other = (AbstractRequestCondition) o;
-		return other.getWeight() - this.getWeight();
+		return other.getSpecificity() - this.getSpecificity();
 	}
 
 }

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/mvc/method/condition/ConsumesRequestCondition.java

@@ -44,7 +44,20 @@ class ConsumesRequestCondition extends AbstractRequestCondition {
 	}
 
 	@Override
-	public int getWeight() {
+	public int getSpecificity() {
 		return 1;
 	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (obj != null && obj instanceof ConsumesRequestCondition) {
+			ConsumesRequestCondition other = (ConsumesRequestCondition) obj;
+			return this.mediaType.equals(other.mediaType);
+		}
+		return false;
+	}
+
 }

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/mvc/method/condition/LogicalNegationRequestCondition.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2002-2011 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.web.servlet.mvc.method.condition;
+
+import javax.servlet.http.HttpServletRequest;
+
+import org.springframework.util.Assert;
+
+/**
+ * {@link RequestCondition} implementation that represents a logical NOT (i.e. !).
+ *
+ * @author Arjen Poutsma
+ * @since 3.1
+ */
+class LogicalNegationRequestCondition extends AbstractRequestCondition {
+
+	private final RequestCondition requestCondition;
+
+	LogicalNegationRequestCondition(RequestCondition requestCondition) {
+		Assert.notNull(requestCondition, "'requestCondition' must not be null");
+		this.requestCondition = requestCondition;
+	}
+
+	@Override
+	protected int getSpecificity() {
+		if (requestCondition instanceof AbstractRequestCondition) {
+			return ((AbstractRequestCondition) requestCondition).getSpecificity();
+		}
+		else {
+			return 0;
+		}
+	}
+
+	public boolean match(HttpServletRequest request) {
+		return !requestCondition.match(request);
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o != null && o instanceof LogicalNegationRequestCondition) {
+			LogicalNegationRequestCondition other = (LogicalNegationRequestCondition) o;
+			return this.requestCondition.equals(other.requestCondition);
+		}
+		return false;
+	}
+
+	@Override
+	public int hashCode() {
+		return requestCondition.hashCode();
+	}
+
+	@Override
+	public String toString() {
+		return "!(" + requestCondition.toString() + ")";
+	}
+}

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/mvc/method/condition/RequestConditionComposite.java

@@ -38,12 +38,12 @@ abstract class RequestConditionComposite extends AbstractRequestCondition {
 	}
 
 	@Override
-	public int getWeight() {
+	public int getSpecificity() {
 		int weight = 0;
 		for (RequestCondition condition : conditions) {
 			if (condition instanceof AbstractRequestCondition) {
 				AbstractRequestCondition abstractRequestCondition = (AbstractRequestCondition) condition;
-				weight += abstractRequestCondition.getWeight();
+				weight += abstractRequestCondition.getSpecificity();
 			}
 		}
 		return weight;

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/mvc/method/condition/RequestConditionFactory.java

@@ -23,6 +23,7 @@ import java.util.List;
 import javax.servlet.http.HttpServletRequest;
 
 import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
 
 /**
  * Factory for {@link RequestCondition} objects.
@@ -39,7 +40,7 @@ public abstract class RequestConditionFactory {
 		}
 
 		@Override
-		public int getWeight() {
+		public int getSpecificity() {
 			return 0;
 		}
 
@@ -55,10 +56,9 @@ public abstract class RequestConditionFactory {
 		}
 
 		@Override
-		public int getWeight() {
+		public int getSpecificity() {
 			return 0;
 		}
-		
 
 		@Override
 		public String toString() {
@@ -94,6 +94,24 @@ public abstract class RequestConditionFactory {
 		return copy[0];
 	}
 
+	/**
+	 * Wraps the given condition in a logical NOT, i.e. the returned condition will return {@code true} for {@link
+	 * RequestCondition#match(HttpServletRequest)} if the given condition return {@code false}, and vice-versa.
+	 *
+	 * @return a condition that represents a logical NOT
+	 */
+	public static RequestCondition not(RequestCondition condition) {
+		if (condition == TRUE_CONDITION) {
+			return falseCondition();
+		}
+		else if (condition == FALSE_CONDITION) {
+			return trueCondition();
+		}
+		else {
+			return new LogicalNegationRequestCondition(condition);
+		}
+	}
+
 	/**
 	 * Combines the given conditions into a logical AND, i.e. the returned condition will return {@code true} for {@link
 	 * RequestCondition#match(HttpServletRequest)} if all of the given conditions do so.
@@ -175,7 +193,11 @@ public abstract class RequestConditionFactory {
 		RequestCondition[] result = new RequestCondition[headers.length];
 		for (int i = 0; i < headers.length; i++) {
 			HeaderRequestCondition header = new HeaderRequestCondition(headers[i]);
-			if (isMediaTypeHeader(header.name)) {
+			if ("Content-Type".equalsIgnoreCase(header.name) && StringUtils.hasLength(header.value)) {
+				RequestCondition consumesCondition = new ConsumesRequestCondition(header.value);
+				result[i] = header.isNegated ? not(consumesCondition) : consumesCondition;
+			}
+			else if (isMediaTypeHeader(header.name)) {
 				result[i] = new MediaTypeHeaderRequestCondition(headers[i]);
 			}
 			else {