Cleaning up after Keith. :)

spring-binding/src/main/java/org/springframework/binding/expression/ExpressionParser.java

@@ -23,6 +23,17 @@ package org.springframework.binding.expression;
  */
 public interface ExpressionParser {
 
+	/**
+	 * Is the provided expression string an "eval" expression: meaning an expression that validates to a dynamic value,
+	 * and not a literal expression? "Eval" expressions are normally enclosed in delimiters like #{}, where literal
+	 * expressions are not delimited.
+	 * 
+	 * TODO - candidate for removal in a future milestone: is this really needed?
+	 * @param string the string
+	 * @return true if the expression is an eval expression string, false otherwise.
+	 */
+	public boolean isEvalExpressionString(String string);
+	
 	/**
 	 * Parse the provided expression string, returning an expression evaluator capable of evaluating it.
 	 * @param expressionString the parseable expression string; cannot be null

spring-binding/src/main/java/org/springframework/binding/expression/el/ELExpressionParser.java

@@ -22,6 +22,16 @@ import org.springframework.binding.expression.ParserException;
  */
 public class ELExpressionParser implements ExpressionParser {
 
+	/**
+	 * The expression prefix.
+	 */
+	private static final String EXPRESSION_PREFIX = "#{";
+
+	/**
+	 * The expression suffix.
+	 */
+	private static final String EXPRESSION_SUFFIX = "}";
+
 	/**
 	 * The ExpressionFactory for constructing EL expressions
 	 */
@@ -45,6 +55,10 @@ public class ELExpressionParser implements ExpressionParser {
 		this.contextFactories.put(expressionTargetType, contextFactory);
 	}
 
+	public boolean isEvalExpressionString(String expressionString) {
+		return expressionString.startsWith(EXPRESSION_PREFIX) && expressionString.endsWith(EXPRESSION_SUFFIX);
+	}
+
 	public Expression parseExpression(String expressionString, Class expressionTargetType,
 			Class expectedEvaluationResultType, ExpressionVariable[] expressionVariables) throws ParserException {
 		if (expectedEvaluationResultType == null) {

spring-binding/src/main/java/org/springframework/binding/expression/support/AbstractExpressionParser.java

@@ -80,6 +80,10 @@ public abstract class AbstractExpressionParser implements ExpressionParser {
 		this.expressionSuffix = expressionSuffix;
 	}
 
+	public boolean isEvalExpressionString(String string) {
+		return string.startsWith(expressionPrefix) && string.endsWith(expressionSuffix);
+	}
+
 	public Expression parseExpression(String expressionString, Class expressionTargetType,
 			Class expectedEvaluationResultType, ExpressionVariable[] expressionVariables) throws ParserException {
 		Assert.notNull(expressionString, "The expression string to parse is required");