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package org.springframework.expression;

Input provided to an expression parser that can influence an expression parsing/compilation routine.
Author:Keith Donald, Andy Clement
Since:3.0
/** * Input provided to an expression parser that can influence an expression * parsing/compilation routine. * * @author Keith Donald * @author Andy Clement * @since 3.0 */
public interface ParserContext {
Whether or not the expression being parsed is a template. A template expression consists of literal text that can be mixed with evaluatable blocks. Some examples:
	   Some literal text
    Hello #{name.firstName}!
    #{3 + 4}
Returns:true if the expression is a template, false otherwise
/** * Whether or not the expression being parsed is a template. A template expression * consists of literal text that can be mixed with evaluatable blocks. Some examples: * <pre class="code"> * Some literal text * Hello #{name.firstName}! * #{3 + 4} * </pre> * @return true if the expression is a template, false otherwise */
boolean isTemplate();
For template expressions, returns the prefix that identifies the start of an expression block within a string. For example: "${"
Returns:the prefix that identifies the start of an expression
/** * For template expressions, returns the prefix that identifies the start of an * expression block within a string. For example: "${" * @return the prefix that identifies the start of an expression */
String getExpressionPrefix();
For template expressions, return the prefix that identifies the end of an expression block within a string. For example: "}"
Returns:the suffix that identifies the end of an expression
/** * For template expressions, return the prefix that identifies the end of an * expression block within a string. For example: "}" * @return the suffix that identifies the end of an expression */
String getExpressionSuffix();
The default ParserContext implementation that enables template expression parsing mode. The expression prefix is "#{" and the expression suffix is "}".
See Also:
  • isTemplate()
/** * The default ParserContext implementation that enables template expression * parsing mode. The expression prefix is "#{" and the expression suffix is "}". * @see #isTemplate() */
ParserContext TEMPLATE_EXPRESSION = new ParserContext() { @Override public boolean isTemplate() { return true; } @Override public String getExpressionPrefix() { return "#{"; } @Override public String getExpressionSuffix() { return "}"; } }; }