Polishing

spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractBeanDefinition.java

 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -433,7 +433,7 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 	 */
 	@Override
 	public boolean isSingleton() {
-		return SCOPE_SINGLETON.equals(scope) || SCOPE_DEFAULT.equals(scope);
+		return SCOPE_SINGLETON.equals(this.scope) || SCOPE_DEFAULT.equals(this.scope);
 	}
 
 	/**
@@ -443,7 +443,7 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 	 */
 	@Override
 	public boolean isPrototype() {
-		return SCOPE_PROTOTYPE.equals(scope);
+		return SCOPE_PROTOTYPE.equals(this.scope);
 	}
 
 	/**
@@ -625,7 +625,7 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 	 * Return whether this bean has the specified qualifier.
 	 */
 	public boolean hasQualifier(String typeName) {
-		return this.qualifiers.keySet().contains(typeName);
+		return this.qualifiers.containsKey(typeName);
 	}
 
 	/**
@@ -778,15 +778,15 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 	/**
 	 * Return information about methods to be overridden by the IoC
 	 * container. This will be empty if there are no method overrides.
-	 * Never returns {@code null}.
+	 * <p>Never returns {@code null}.
 	 */
 	public MethodOverrides getMethodOverrides() {
 		return this.methodOverrides;
 	}
 
 	/**
-	 * Set the name of the initializer method. The default is {@code null}
-	 * in which case there is no initializer method.
+	 * Set the name of the initializer method.
+	 * <p>The default is {@code null} in which case there is no initializer method.
 	 */
 	public void setInitMethodName(String initMethodName) {
 		this.initMethodName = initMethodName;
@@ -801,7 +801,7 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 
 	/**
 	 * Specify whether or not the configured init method is the default.
-	 * Default value is {@code false}.
+	 * <p>The default value is {@code false}.
 	 * @see #setInitMethodName
 	 */
 	public void setEnforceInitMethod(boolean enforceInitMethod) {
@@ -817,8 +817,8 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 	}
 
 	/**
-	 * Set the name of the destroy method. The default is {@code null}
-	 * in which case there is no destroy method.
+	 * Set the name of the destroy method.
+	 * <p>The default is {@code null} in which case there is no destroy method.
 	 */
 	public void setDestroyMethodName(String destroyMethodName) {
 		this.destroyMethodName = destroyMethodName;
@@ -833,7 +833,7 @@ public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccess
 
 	/**
 	 * Specify whether or not the configured destroy method is the default.
-	 * Default value is {@code false}.
+	 * <p>The default value is {@code false}.
 	 * @see #setDestroyMethodName
 	 */
 	public void setEnforceDestroyMethod(boolean enforceDestroyMethod) {

spring-context/src/main/java/org/springframework/context/annotation/ImportBeanDefinitionRegistrar.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -58,7 +58,6 @@ public interface ImportBeanDefinitionRegistrar {
 	 * @param importingClassMetadata annotation metadata of the importing class
 	 * @param registry current bean definition registry
 	 */
-	public void registerBeanDefinitions(
-			AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry);
+	void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry);
 
 }

spring-context/src/main/java/org/springframework/context/annotation/ImportSelector.java

@@ -20,12 +20,12 @@ import org.springframework.core.type.AnnotationMetadata;
 
 /**
  * Interface to be implemented by types that determine which @{@link Configuration}
- * class(es) should be imported based on a given selection criteria, usually one or more
- * annotation attributes.
+ * class(es) should be imported based on a given selection criteria, usually one or
+ * more annotation attributes.
  *
  * <p>An {@link ImportSelector} may implement any of the following
- * {@link org.springframework.beans.factory.Aware Aware} interfaces, and their respective
- * methods will be called prior to {@link #selectImports}:
+ * {@link org.springframework.beans.factory.Aware Aware} interfaces,
+ * and their respective methods will be called prior to {@link #selectImports}:
  * <ul>
  * <li>{@link org.springframework.context.EnvironmentAware EnvironmentAware}</li>
  * <li>{@link org.springframework.beans.factory.BeanFactoryAware BeanFactoryAware}</li>
@@ -33,10 +33,10 @@ import org.springframework.core.type.AnnotationMetadata;
  * <li>{@link org.springframework.context.ResourceLoaderAware ResourceLoaderAware}</li>
  * </ul>
  *
- * <p>ImportSelectors are usually processed in the same way as regular {@code @Import}
- * annotations, however, it is also possible to defer selection of imports until all
- * {@code @Configuration} classes have been processed (see {@link DeferredImportSelector}
- * for details).
+ * <p>{@code ImportSelector} implementations are usually processed in the same way
+ * as regular {@code @Import} annotations, however, it is also possible to defer
+ * selection of imports until all {@code @Configuration} classes have been processed
+ * (see {@link DeferredImportSelector} for details).
  *
  * @author Chris Beams
  * @since 3.1

spring-context/src/main/java/org/springframework/context/support/AbstractApplicationContext.java

@@ -91,24 +91,24 @@ import org.springframework.util.StringValueResolver;
  * to detect special beans defined in its internal bean factory:
  * Therefore, this class automatically registers
  * {@link org.springframework.beans.factory.config.BeanFactoryPostProcessor BeanFactoryPostProcessors},
- * {@link org.springframework.beans.factory.config.BeanPostProcessor BeanPostProcessors}
+ * {@link org.springframework.beans.factory.config.BeanPostProcessor BeanPostProcessors},
  * and {@link org.springframework.context.ApplicationListener ApplicationListeners}
  * which are defined as beans in the context.
  *
  * <p>A {@link org.springframework.context.MessageSource} may also be supplied
  * as a bean in the context, with the name "messageSource"; otherwise, message
  * resolution is delegated to the parent context. Furthermore, a multicaster
- * for application events can be supplied as "applicationEventMulticaster" bean
+ * for application events can be supplied as an "applicationEventMulticaster" bean
  * of type {@link org.springframework.context.event.ApplicationEventMulticaster}
  * in the context; otherwise, a default multicaster of type
  * {@link org.springframework.context.event.SimpleApplicationEventMulticaster} will be used.
  *
- * <p>Implements resource loading through extending
+ * <p>Implements resource loading by extending
  * {@link org.springframework.core.io.DefaultResourceLoader}.
  * Consequently treats non-URL resource paths as class path resources
  * (supporting full class path resource names that include the package path,
  * e.g. "mypackage/myresource.dat"), unless the {@link #getResourceByPath}
- * method is overwritten in a subclass.
+ * method is overridden in a subclass.
  *
  * @author Rod Johnson
  * @author Juergen Hoeller
@@ -381,7 +381,7 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 		else {
 			applicationEvent = new PayloadApplicationEvent<Object>(this, event);
 			if (eventType == null) {
-				eventType = ((PayloadApplicationEvent) applicationEvent).getResolvableType();
+				eventType = ((PayloadApplicationEvent<?>) applicationEvent).getResolvableType();
 			}
 		}
 
@@ -695,7 +695,7 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 	}
 
 	/**
-	 * Instantiate and invoke all registered BeanPostProcessor beans,
+	 * Instantiate and register all BeanPostProcessor beans,
 	 * respecting explicit order if given.
 	 * <p>Must be called before any instantiation of application beans.
 	 */

spring-core/src/main/java/org/springframework/util/ObjectUtils.java

 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -606,7 +606,7 @@ public abstract class ObjectUtils {
 
 	/**
 	 * Determine the class name for the given object.
-	 * <p>Returns {@code "null"} if {@code obj} is {@code null}.
+	 * <p>Returns a {@code "null"} String if {@code obj} is {@code null}.
 	 * @param obj the object to introspect (may be {@code null})
 	 * @return the corresponding class name
 	 */
@@ -617,7 +617,7 @@ public abstract class ObjectUtils {
 	/**
 	 * Return a String representation of the specified Object.
 	 * <p>Builds a String representation of the contents in case of an array.
-	 * Returns {@code "null"} if {@code obj} is {@code null}.
+	 * Returns a {@code "null"} String if {@code obj} is {@code null}.
 	 * @param obj the object to build a String representation for
 	 * @return a String representation of {@code obj}
 	 */
@@ -663,8 +663,8 @@ public abstract class ObjectUtils {
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated
-	 * by the characters {@code ", "} (a comma followed by a space). Returns
-	 * {@code "null"} if {@code array} is {@code null}.
+	 * by the characters {@code ", "} (a comma followed by a space).
+	 * Returns a {@code "null"} String if {@code array} is {@code null}.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of {@code array}
 	 */
@@ -694,8 +694,8 @@ public abstract class ObjectUtils {
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated
-	 * by the characters {@code ", "} (a comma followed by a space). Returns
-	 * {@code "null"} if {@code array} is {@code null}.
+	 * by the characters {@code ", "} (a comma followed by a space).
+	 * Returns a {@code "null"} String if {@code array} is {@code null}.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of {@code array}
 	 */
@@ -726,8 +726,8 @@ public abstract class ObjectUtils {
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated
-	 * by the characters {@code ", "} (a comma followed by a space). Returns
-	 * {@code "null"} if {@code array} is {@code null}.
+	 * by the characters {@code ", "} (a comma followed by a space).
+	 * Returns a {@code "null"} String if {@code array} is {@code null}.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of {@code array}
 	 */
@@ -757,8 +757,8 @@ public abstract class ObjectUtils {
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated
-	 * by the characters {@code ", "} (a comma followed by a space). Returns
-	 * {@code "null"} if {@code array} is {@code null}.
+	 * by the characters {@code ", "} (a comma followed by a space).
+	 * Returns a {@code "null"} String if {@code array} is {@code null}.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of {@code array}
 	 */
@@ -788,8 +788,8 @@ public abstract class ObjectUtils {
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated
-	 * by the characters {@code ", "} (a comma followed by a space). Returns
-	 * {@code "null"} if {@code array} is {@code null}.
+	 * by the characters {@code ", "} (a comma followed by a space).
+	 * Returns a {@code "null"} String if {@code array} is {@code null}.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of {@code array}
 	 */
@@ -820,8 +820,8 @@ public abstract class ObjectUtils {
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated
-	 * by the characters {@code ", "} (a comma followed by a space). Returns
-	 * {@code "null"} if {@code array} is {@code null}.
+	 * by the characters {@code ", "} (a comma followed by a space).
+	 * Returns a {@code "null"} String if {@code array} is {@code null}.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of {@code array}
 	 */
@@ -852,8 +852,8 @@ public abstract class ObjectUtils {
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated
-	 * by the characters {@code ", "} (a comma followed by a space). Returns
-	 * {@code "null"} if {@code array} is {@code null}.
+	 * by the characters {@code ", "} (a comma followed by a space).
+	 * Returns a {@code "null"} String if {@code array} is {@code null}.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of {@code array}
 	 */
@@ -883,8 +883,8 @@ public abstract class ObjectUtils {
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated
-	 * by the characters {@code ", "} (a comma followed by a space). Returns
-	 * {@code "null"} if {@code array} is {@code null}.
+	 * by the characters {@code ", "} (a comma followed by a space).
+	 * Returns a {@code "null"} String if {@code array} is {@code null}.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of {@code array}
 	 */
@@ -914,8 +914,8 @@ public abstract class ObjectUtils {
 	 * Return a String representation of the contents of the specified array.
 	 * <p>The String representation consists of a list of the array's elements,
 	 * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated
-	 * by the characters {@code ", "} (a comma followed by a space). Returns
-	 * {@code "null"} if {@code array} is {@code null}.
+	 * by the characters {@code ", "} (a comma followed by a space).
+	 * Returns a {@code "null"} String if {@code array} is {@code null}.
 	 * @param array the array to build a String representation for
 	 * @return a String representation of {@code array}
 	 */

spring-messaging/src/main/java/org/springframework/messaging/simp/config/AbstractMessageBrokerConfiguration.java

 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -65,18 +65,20 @@ import org.springframework.validation.Validator;
  * protocols such as STOMP.
  *
  * <p>{@link #clientInboundChannel()} and {@link #clientOutboundChannel()} deliver
- * messages to and from remote clients to several message handlers such as
+ * messages to and from remote clients to several message handlers such as the
+ * following.
  * <ul>
  * <li>{@link #simpAnnotationMethodMessageHandler()}</li>
  * <li>{@link #simpleBrokerMessageHandler()}</li>
  * <li>{@link #stompBrokerRelayMessageHandler()}</li>
  * <li>{@link #userDestinationMessageHandler()}</li>
  * </ul>
- * while {@link #brokerChannel()} delivers messages from within the application to the
+ *
+ * <p>{@link #brokerChannel()} delivers messages from within the application to the
  * the respective message handlers. {@link #brokerMessagingTemplate()} can be injected
  * into any application component to send messages.
  *
- * <p>Subclasses are responsible for the part of the configuration that feed messages
+ * <p>Subclasses are responsible for the parts of the configuration that feed messages
  * to and from the client inbound/outbound channels (e.g. STOMP over WebSocket).
  *
  * @author Rossen Stoyanchev
@@ -387,7 +389,7 @@ public abstract class AbstractMessageBrokerConfiguration implements ApplicationC
 	 * Override this method to add custom message converters.
 	 * @param messageConverters the list to add converters to, initially empty
 	 * @return {@code true} if default message converters should be added to list,
-	 * {@code false} if no more converters should be added.
+	 * {@code false} if no more converters should be added
 	 */
 	protected boolean configureMessageConverters(List<MessageConverter> messageConverters) {
 		return true;
@@ -410,7 +412,7 @@ public abstract class AbstractMessageBrokerConfiguration implements ApplicationC
 	}
 
 	/**
-	 * Create the user registry that provides access to the local users.
+	 * Create the user registry that provides access to local users.
 	 */
 	protected abstract SimpUserRegistry createLocalUserRegistry();
 

spring-messaging/src/main/java/org/springframework/messaging/simp/stomp/StompDecoder.java

 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -258,7 +258,7 @@ public class StompDecoder {
 			if (index + 1 >= inString.length()) {
 				throw new StompConversionException("Illegal escape sequence at index " + index + ": " + inString);
 			}
-			Character c = inString.charAt(index + 1);
+			char c = inString.charAt(index + 1);
 			if (c == 'r') {
 				sb.append('\r');
 			}

spring-messaging/src/main/java/org/springframework/messaging/simp/user/MultiServerUserRegistry.java

 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -63,7 +63,7 @@ public class MultiServerUserRegistry implements SimpUserRegistry, SmartApplicati
 	 * Create an instance wrapping the local user registry.
 	 */
 	public MultiServerUserRegistry(SimpUserRegistry localRegistry) {
-		Assert.notNull(localRegistry, "'localRegistry' is required.");
+		Assert.notNull(localRegistry, "'localRegistry' is required");
 		this.id = generateId();
 		this.localRegistry = localRegistry;
 		this.delegateApplicationEvents = this.localRegistry instanceof SmartApplicationListener;
@@ -274,10 +274,10 @@ public class MultiServerUserRegistry implements SimpUserRegistry, SmartApplicati
 
 		private String name;
 
-		/* User sessions from "this" registry only (i.e. one server) */
+		// User sessions from "this" registry only (i.e. one server)
 		private Set<TransferSimpSession> sessions;
 
-		/* Cross-server session lookup (e.g. user connected to multiple servers) */
+		// Cross-server session lookup (e.g. user connected to multiple servers)
 		private SessionLookup sessionLookup;
 
 		/**
@@ -518,13 +518,13 @@ public class MultiServerUserRegistry implements SimpUserRegistry, SmartApplicati
 				return false;
 			}
 			SimpSubscription otherSubscription = (SimpSubscription) other;
-			return (ObjectUtils.nullSafeEquals(getSession(), otherSubscription.getSession()) &&
-					this.id.equals(otherSubscription.getId()));
+			return (getId().equals(otherSubscription.getId()) &&
+					ObjectUtils.nullSafeEquals(getSession(), otherSubscription.getSession()));
 		}
 
 		@Override
 		public int hashCode() {
-			return this.id.hashCode() * 31 + ObjectUtils.nullSafeHashCode(getSession());
+			return getId().hashCode() * 31 + ObjectUtils.nullSafeHashCode(getSession());
 		}
 
 		@Override

spring-test/src/main/java/org/springframework/test/context/TestContext.java

 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -29,6 +29,8 @@ import org.springframework.test.annotation.DirtiesContext.HierarchyMode;
  *
  * @author Sam Brannen
  * @since 2.5
+ * @see TestContextManager
+ * @see TestExecutionListener
  */
 public interface TestContext extends AttributeAccessor, Serializable {
 
@@ -38,7 +40,7 @@ public interface TestContext extends AttributeAccessor, Serializable {
 	 * <p>Implementations of this method are responsible for loading the
 	 * application context if the corresponding context has not already been
 	 * loaded, potentially caching the context as well.
-	 * @return the application context
+	 * @return the application context (never {@code null})
 	 * @throws IllegalStateException if an error occurs while retrieving the
 	 * application context
 	 */
@@ -70,8 +72,7 @@ public interface TestContext extends AttributeAccessor, Serializable {
 	 * Get the {@linkplain Throwable exception} that was thrown during execution
 	 * of the {@linkplain #getTestMethod() test method}.
 	 * <p>Note: this is a mutable property.
-	 * @return the exception that was thrown, or {@code null} if no
-	 * exception was thrown
+	 * @return the exception that was thrown, or {@code null} if no exception was thrown
 	 * @see #updateState(Object, Method, Throwable)
 	 */
 	Throwable getTestException();
@@ -89,14 +90,13 @@ public interface TestContext extends AttributeAccessor, Serializable {
 	void markApplicationContextDirty(HierarchyMode hierarchyMode);
 
 	/**
-	 * Update this test context to reflect the state of the currently executing
-	 * test.
+	 * Update this test context to reflect the state of the currently executing test.
 	 * <p>Caution: concurrent invocations of this method might not be thread-safe,
 	 * depending on the underlying implementation.
 	 * @param testInstance the current test instance (may be {@code null})
 	 * @param testMethod the current test method (may be {@code null})
-	 * @param testException the exception that was thrown in the test method, or
-	 * {@code null} if no exception was thrown
+	 * @param testException the exception that was thrown in the test method,
+	 * or {@code null} if no exception was thrown
 	 */
 	void updateState(Object testInstance, Method testMethod, Throwable testException);
 

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/condition/AbstractRequestCondition.java

 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -28,16 +28,39 @@ import java.util.Iterator;
  */
 public abstract class AbstractRequestCondition<T extends AbstractRequestCondition<T>> implements RequestCondition<T> {
 
+	/**
+	 * Indicates whether this condition is empty, i.e. whether or not it
+	 * contains any discrete items.
+	 * @return {@code true} if empty; {@code false} otherwise
+	 */
+	public boolean isEmpty() {
+		return getContent().isEmpty();
+	}
+
+	/**
+	 * Return the discrete items a request condition is composed of.
+	 * <p>For example URL patterns, HTTP request methods, param expressions, etc.
+	 * @return a collection of objects (never {@code null})
+	 */
+	protected abstract Collection<?> getContent();
+
+	/**
+	 * The notation to use when printing discrete items of content.
+	 * <p>For example {@code " || "} for URL patterns or {@code " && "}
+	 * for param expressions.
+	 */
+	protected abstract String getToStringInfix();
+
+
 	@Override
-	public boolean equals(Object obj) {
-		if (this == obj) {
+	public boolean equals(Object other) {
+		if (this == other) {
 			return true;
 		}
-		if (obj != null && getClass() == obj.getClass()) {
-			AbstractRequestCondition<?> other = (AbstractRequestCondition<?>) obj;
-			return getContent().equals(other.getContent());
+		if (other == null || getClass() != other.getClass()) {
+			return false;
 		}
-		return false;
+		return getContent().equals(((AbstractRequestCondition<?>) other).getContent());
 	}
 
 	@Override
@@ -59,28 +82,4 @@ public abstract class AbstractRequestCondition<T extends AbstractRequestConditio
 		return builder.toString();
 	}
 
-	/**
-	 * Indicates whether this condition is empty, i.e. whether or not it
-	 * contains any discrete items.
-	 * @return {@code true} if empty; {@code false} otherwise
-	 */
-	public boolean isEmpty() {
-		return getContent().isEmpty();
-	}
-
-
-	/**
-	 * Return the discrete items a request condition is composed of.
-	 * <p>For example URL patterns, HTTP request methods, param expressions, etc.
-	 * @return a collection of objects, never {@code null}
-	 */
-	protected abstract Collection<?> getContent();
-
-	/**
-	 * The notation to use when printing discrete items of content.
-	 * <p>For example {@code " || "} for URL patterns or {@code " && "}
-	 * for param expressions.
-	 */
-	protected abstract String getToStringInfix();
-
 }