1 package org.smartcomps.twister.engine.priv.expression;
2
3 import org.smartcomps.twister.engine.priv.core.dynamic.ProcessInstance;
4 import org.smartcomps.twister.engine.exception.XPathEvaluationException;
5
6 import java.util.Date;
7
8 /***
9 * Evaluates an expression against Twister XML database and returns the
10 * appropriate value.
11 */
12 public interface ExpressionProcessor {
13
14 public boolean evaluateAsBoolean(ProcessInstance instance, String expression) throws XPathEvaluationException;
15 public Date evaluateAsDate(ProcessInstance instance, String expression) throws XPathEvaluationException;
16
17 /***
18 * Evaluates an expression resulting in a duration value and adds this duration
19 * to now to obtain a new date.
20 * @param instance
21 * @param expression
22 * @return Date
23 * @throws XPathEvaluationException
24 */
25 public Date evaluateDurationAsDate(ProcessInstance instance, String expression) throws XPathEvaluationException;
26
27 public String evaluateAsString(ProcessInstance instance, String expression) throws XPathEvaluationException;
28 }
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