ForEachTest.java

/*
* Copyright 2016 Nabarun Mondal
* Licensed 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 com.noga.njexl.lang;

import java.util.*;


/**
 * Tests for the foreach statement
 * @since 1.1
 */
public class ForEachTest extends JexlTestCase {

    /** create a named test */
    public ForEachTest(String name) {
        super(name);
    }

    public void testForEachWithEmptyStatement() throws Exception {
        Expression e = JEXL.createExpression("for(item : list) ;");
        JexlContext jc = new MapContext();
        jc.set("list","[]");


        Object o = e.evaluate(jc);
        assertNull("Result is not null", o);
    }

    public void testForEachWithEmptyList() throws Exception {
        JexlContext jc = new MapContext();

        Expression e = JEXL.createExpression("for(item : [] )  1+1 ");

        Object o = e.evaluate(jc);
        assertNull("Result is not null", o);
    }

    public void testForEachWithArray() throws Exception {
        Expression e = JEXL.createExpression("for(item : list) item");
        JexlContext jc = new MapContext();
        jc.set("list", new Object[] {"Hello", "World"});
        Object o = e.evaluate(jc);
        assertEquals("Result is not last evaluated expression", "World", o);
    }

    public void testForEachWithCollection() throws Exception {
        Expression e = JEXL.createExpression("for(item : list) item");
        JexlContext jc = new MapContext();
        jc.set("list", Arrays.asList(new Object[] {"Hello", "World"}));
        Object o = e.evaluate(jc);
        assertEquals("Result is not last evaluated expression", "World", o);
    }

    public void testForEachWithEnumeration() throws Exception {
        Expression e = JEXL.createExpression("for(item : list) item");
        JexlContext jc = new MapContext();
        jc.set("list", new StringTokenizer("Hello,World", ","));
        Object o = e.evaluate(jc);
        assertEquals("Result is not last evaluated expression", "World", o);
    }

    public void testForEachWithIterator() throws Exception {
        Expression e = JEXL.createExpression("for(item : list) item");
        JexlContext jc = new MapContext();
        jc.set("list", Arrays.asList(new Object[] {"Hello", "World"}).iterator());
        Object o = e.evaluate(jc);
        assertEquals("Result is not last evaluated expression", "World", o);
    }

    public void testForEachWithMap() throws Exception {
        Expression e = JEXL.createExpression("for(item : list) item.value ");
        JexlContext jc = new MapContext();
        Map<?, ?> map = System.getProperties();
        String lastProperty = (String) new ArrayList<Object>(map.values()).get(System.getProperties().size() - 1);
        jc.set("list", map);
        Object o = e.evaluate(jc);
        assertEquals("Result is not last evaluated expression", lastProperty, o);
    }

    public void testForEachWithBlock() throws Exception {
        Expression exs0 = JEXL.createExpression("for(in : list) { x = x + in; }");
        Expression []exs = { exs0 };
        JexlContext jc = new MapContext();
        jc.set("list", new Object[] {"2", "3"});
        for(int ex = 0; ex < exs.length; ++ex) {
            jc.set("x", new Integer(1));
            Object o = exs[ex].evaluate(jc);
            assertEquals("Result is wrong", new Integer(6), o);
            assertEquals("x is wrong", new Integer(6), jc.get("x"));
        }
    }

    public void testForEachWithListExpression() throws Exception {
        Expression e = JEXL.createExpression("for(item : list.keySet()) item");
        JexlContext jc = new MapContext();
        Map<?, ?> map = System.getProperties();
        String lastKey = (String) new ArrayList<Object>(map.keySet()).get(System.getProperties().size() - 1);
        jc.set("list", map);
        Object o = e.evaluate(jc);
        assertEquals("Result is not last evaluated expression", lastKey, o);
    }
    
    public void testForEachWithProperty() throws Exception {
        Expression e = JEXL.createExpression("for(item : list.cheeseList) item");
        JexlContext jc = new MapContext();
        jc.set("list", new Foo());
        Object o = e.evaluate(jc);
        assertEquals("Result is not last evaluated expression", "brie", o);
    }
    
    public void testForEachWithIteratorMethod() throws Exception {
        Expression e = JEXL.createExpression("for(item : list.cheezy) item");
        JexlContext jc = new MapContext();
        jc.set("list", new Foo());
        Object o = e.evaluate(jc);
        assertEquals("Result is not last evaluated expression", "brie", o);
    }
}