config/src/main/java/org/springframework/security/config/annotation/web/messaging/MessageSecurityMetadataSourceRegistry.java
protected MessageSecurityMetadataSource createMetadataSource() {
		LinkedHashMap<MessageMatcher<?>, String> matcherToExpression = new LinkedHashMap<MessageMatcher<?>, String>();
		for (Map.Entry<MatcherBuilder, String> entry : this.matcherToExpression
				.entrySet()) {
			matcherToExpression.put(entry.getKey().build(), entry.getValue());
		}
		return ExpressionBasedMessageSecurityMetadataSourceFactory
				.createExpressionMessageMetadataSource(matcherToExpression, expressionHandler);
	}
protected MessageSecurityMetadataSource createMetadataSource() {
		LinkedHashMap<MessageMatcher<?>, String> matcherToExpression = new LinkedHashMap<MessageMatcher<?>, String>();
		for (Map.Entry<MatcherBuilder, String> entry : this.matcherToExpression
				.entrySet()) {
			matcherToExpression.put(entry.getKey().build(), entry.getValue());
		}
		return ExpressionBasedMessageSecurityMetadataSourceFactory
				.createExpressionMessageMetadataSource(matcherToExpression, expressionHandler);
	}
protected MessageSecurityMetadataSource createMetadataSource ( ) { LinkedHashMap < MessageMatcher < ? > , String > matcherToExpression = new LinkedHashMap < MessageMatcher < ? > , String > ( ) ; for ( Map . Entry < MatcherBuilder , String > entry : this . matcherToExpression . entrySet ( ) ) { matcherToExpression . put ( entry . getKey ( ) . build ( ) , entry . getValue ( ) ) ; } return ExpressionBasedMessageSecurityMetadataSourceFactory . createExpressionMessageMetadataSource ( matcherToExpression , expressionHandler ) ; }
Allows subclasses to create creating a {@link MessageSecurityMetadataSource}.

<p>
This is not exposed so as not to confuse users of the API, which should never
invoke this method.
</p>

@return the {@link MessageSecurityMetadataSource} to use
Allows subclasses to create creating a { @link MessageSecurityMetadataSource } .