vodserver.util

Class ExpressionUtil

java.lang.Object

vodserver.util.ExpressionUtil

public class ExpressionUtil
extends Object

This class provides utility methods related to expression evaluation.

Author:

Ruud Senden

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ExpressionUtil.ExpressionMethodResolver This class contains several utility methods that can be called from within expressions.

Constructor Summary

Constructors

Constructor and Description
ExpressionUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static String	evaluateExpressions(String textWithExpressions, Map<String,String> params, boolean recursive) This method will evaluate any expressions within the given textWithExpressions, using the given parameter map as evaluation context.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExpressionUtil

public ExpressionUtil()

Method Detail

evaluateExpressions

public static final String evaluateExpressions(String textWithExpressions,
                         Map<String,String> params,
                         boolean recursive)

This method will evaluate any expressions within the given textWithExpressions, using the given parameter map as evaluation context. Expressions need to be delimited by double exclamation marks, i.e. 'regularText !!expression!! moreRegularText !!otherExpression'.

Expressions can reference entries from the given parameter map by key, i.e. for a map with key 'mapKey' and corresponding value 'mapValue', the expression '!!mapKey!!' will evaluate to 'mapValue'.

Expressions can also use the methods as defined in ExpressionUtil.ExpressionMethodResolver, for example '!!prefix("a","b")!!' will evaluate to 'ab'.

If the recursive parameter is set to true, expressions will be evaluated recursively. I.e. if the parameter map contains a key 'myKey' with value '!!otherKey!!', and another entry 'otherKey' mapped to 'otherValue', the expression '!!myKey!!' will evaluate to 'otherValue' if recursive is set to true, or '!!otherKey!!' if recursive is set to false.

Expressions use the Spring Expression Language syntax; please refer to the Spring framework documentation for more details.

Parameters:

textWithExpressions -

params -

recursive -

Returns: