src/test/java/org/apache/commons/jexl3/ContextNamespaceTest.java

/*
 * 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.commons.jexl3;

import org.junit.Assert;
import org.junit.Test;

/**
 * Tests JexlContext (advanced) features.
 */
@SuppressWarnings({"UnnecessaryBoxing", "AssertEqualsBetweenInconvertibleTypes"})
public class ContextNamespaceTest extends JexlTestCase {

    public ContextNamespaceTest() {
        super("ContextNamespaceTest");
    }

    /*
     * Accesses the thread context and cast it.
     */
    public static class Taxes {
        private final double vat;
        
        public Taxes(final TaxesContext ctxt) {
            vat = ctxt.getVAT();
        } 
        
        public Taxes(final double d) {
            vat = d;
        }
        
        public double vat(final double n) {
            return (n * vat) / 100.;
        }
    }

    /**
     * A thread local context carrying a namespace and some inner constants.
     */
    public static class TaxesContext extends MapContext implements JexlContext.ThreadLocal, JexlContext.NamespaceResolver {
        private Taxes taxes = null;
        private final double vat;

        TaxesContext(final double vat) {
            this.vat = vat;
        }

        @Override
        public Object resolveNamespace(final String name) {
            if ("taxes".equals(name)) {
                if (taxes == null) {
                    taxes = new Taxes(vat);
                }
                return taxes;
            }
            return null;
        }

        public double getVAT() {
            return vat;
        }
    }

    @Test
    public void testThreadedContext() throws Exception {
        final JexlEngine jexl = new JexlBuilder().create();
        final TaxesContext context = new TaxesContext(18.6);
        final String strs = "taxes:vat(1000)";
        final JexlScript staxes = jexl.createScript(strs);
        final Object result = staxes.execute(context);
        Assert.assertEquals(186., result);
    }
    
    @Test
    public void testNamespacePragma() throws Exception {
        final JexlEngine jexl = new JexlBuilder().create();
        final JexlContext context = new TaxesContext(18.6);
        // local namespace tax declared
        final String strs =
                  "#pragma jexl.namespace.tax org.apache.commons.jexl3.ContextNamespaceTest$Taxes\n"
                + "tax:vat(2000)";
        final JexlScript staxes = jexl.createScript(strs);
        final Object result = staxes.execute(context);
        Assert.assertEquals(372., result);
    }

        
    @Test
    public void testNamespacePragmaString() throws Exception {
        final JexlEngine jexl = new JexlBuilder().create();
        final JexlContext context = new MapContext();
        // local namespace str declared
        final String strs =
                  "#pragma jexl.namespace.str java.lang.String\n"
                + "str:format('%04d', 42)";
        final JexlScript staxes = jexl.createScript(strs);
        final Object result = staxes.execute(context);
        Assert.assertEquals("0042", result);
    }

    public static class Vat {
        private double vat;

        Vat(final double vat) {
            this.vat = vat;
        }

        public double getVAT() {
            return vat;
        }

        public void setVAT(final double vat) {
            this.vat = vat;
        }

        public double getvat() {
            throw new UnsupportedOperationException("no way");
        }

        public void setvat(final double vat) {
            throw new UnsupportedOperationException("no way");
        }
    }

    @Test
    public void testObjectContext() throws Exception {
        final JexlEngine jexl = new JexlBuilder().strict(true).silent(false).create();
        final Vat vat = new Vat(18.6);
        final ObjectContext<Vat> ctxt = new ObjectContext<Vat>(jexl, vat);
        Assert.assertEquals(18.6d, (Double) ctxt.get("VAT"), 0.0001d);
        ctxt.set("VAT", 20.0d);
        Assert.assertEquals(20.0d, (Double) ctxt.get("VAT"), 0.0001d);

        try {
            ctxt.get("vat");
            Assert.fail("should have failed");
        } catch(final JexlException.Property xprop) {
            //
        }

        try {
            ctxt.set("vat", 33.0d);
            Assert.fail("should have failed");
        } catch(final JexlException.Property xprop) {
            //
        }
    }

}