Example usage for org.apache.commons.jexl3 JxltEngine createExpression

Introduction

In this page you can find the example usage for org.apache.commons.jexl3 JxltEngine createExpression.

Prototype

public Expression createExpression(String expression) 

Source Link

Document

Creates a a Expression from an expression string.

Usage

From source file:datainstiller.data.DataAliasesConverter.java

@Override
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
    DataAliases aliases = new DataAliases();
    String nodeName;/*from ww w  . j  a v  a  2  s  . c  om*/
    String value;
    Object objValue = null;
    JxltEngine jxlt = new JexlBuilder().strict(true).silent(false).create().createJxltEngine();
    while (reader.hasMoreChildren()) {
        reader.moveDown();
        nodeName = reader.getNodeName();
        value = reader.getValue();
        if (value.matches("\\$\\[.+]")) {
            Pattern pattern = Pattern.compile("\\$\\[(.+)\\(\\s*'\\s*(.*)\\s*'\\s*,\\s*'\\s*(.*)\\s*'\\s*\\)");
            Matcher matcher = pattern.matcher(value);
            if (matcher.find() != true) {
                throw new PatternUnmarshalException(value + " - invalid data generation expression!");
            }
            GeneratorInterface genType = new DataGenerator().getGenerator(matcher.group(1).trim());
            String init = matcher.group(2);
            String val = matcher.group(3);
            value = genType.generate(init, val);
        } else {
            JxltEngine.Expression expr = jxlt.createExpression(value);
            try {
                objValue = expr.evaluate(jexlContext);
                value = objValue.toString();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        aliases.put(nodeName, value);
        if (objValue != null) {
            jexlContext.set(nodeName, objValue);
        } else {
            jexlContext.set(nodeName, value);
        }
        objValue = null;
        reader.moveUp();
    }
    return aliases;
}

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