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Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. /
package org.apache.cayenne.modeler.util;
import  org.apache.cayenne.exp.Expression;
import  org.apache.cayenne.exp.ExpressionException;
import  org.apache.cayenne.exp.parser.ParseException;
import  org.apache.cayenne.util.Util;

A Scope convertor that allows to display expressions in text fields.

public class ExpressionConvertor {
    public String valueAsString(Object valuethrows IllegalArgumentException {
        if (value == null) {
            return null;
        if (!(value instanceof Expression)) {
            throw new IllegalArgumentException(
                "Unsupported value class: " + value.getClass().getName());
        return value.toString();
    public Object stringAsValue(String stringthrows IllegalArgumentException {
        if (string == null || string.trim().length() == 0) {
            return null;
        try {
            return Expression.fromString(string);
        catch (ExpressionException eex) {
            // this is likely a parse exception... show detailed message
            Throwable cause = Util.unwindException(eex);
            String message =
                (cause instanceof ParseException)
                    ? cause.getMessage()
                    : "Invalid expression: " + string;
            throw new IllegalArgumentException(message);
    public boolean supportsStringAsValue() {
        return true;
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