/*
 * Copyright 2002-2012 the original author or authors.
 *
 * 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 org.springframework.expression.spel.support;

import java.util.List;

import org.junit.Assert;
import org.junit.Test;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.Operation;
import org.springframework.expression.OperatorOverloader;
import org.springframework.expression.TypeComparator;
import org.springframework.expression.TypeConverter;
import org.springframework.expression.TypeLocator;

public class StandardComponentsTests {

	@Test
	public void testStandardEvaluationContext() {
		StandardEvaluationContext context = new StandardEvaluationContext();
		Assert.assertNotNull(context.getTypeComparator());

		TypeComparator tc = new StandardTypeComparator();
		context.setTypeComparator(tc);
		Assert.assertEquals(tc,context.getTypeComparator());

		TypeLocator tl = new StandardTypeLocator();
		context.setTypeLocator(tl);
		Assert.assertEquals(tl,context.getTypeLocator());
	}

	@Test
	public void testStandardOperatorOverloader() throws EvaluationException {
		OperatorOverloader oo = new StandardOperatorOverloader();
		Assert.assertFalse(oo.overridesOperation(Operation.ADD, null, null));
		try {
			oo.operate(Operation.ADD, 2, 3);
			Assert.fail("should have failed");
		} catch (EvaluationException e) {
			// success
		}
	}

	@Test
	public void testStandardTypeLocator() {
		StandardTypeLocator tl = new StandardTypeLocator();
		List<String> prefixes = tl.getImportPrefixes();
		Assert.assertEquals(1,prefixes.size());
		tl.registerImport("java.util");
		prefixes = tl.getImportPrefixes();
		Assert.assertEquals(2,prefixes.size());
		tl.removeImport("java.util");
		prefixes = tl.getImportPrefixes();
		Assert.assertEquals(1,prefixes.size());
	}

	@Test
	public void testStandardTypeConverter() throws EvaluationException {
		TypeConverter tc = new StandardTypeConverter();
		tc.convertValue(3, TypeDescriptor.forObject(3), TypeDescriptor.valueOf(Double.class));
	}

}

