resourcefactorybeantests.java

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/*
 * Copyright 2002-2006 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.beans.factory.config;

import junit.framework.TestCase;
import org.easymock.MockControl;
import org.springframework.core.io.Resource;
import org.springframework.test.AssertThrows;

import java.io.File;
import java.io.InputStream;
import java.net.URL;

/**
 * Unit tests for the {@link ResourceFactoryBean} class.
 *
 * @author Rick Evans
 */
public final class ResourceFactoryBeanTests extends TestCase {

    public void testIsSingleton() throws Exception {
        ResourceFactoryBean factory = new ResourceFactoryBean();
        assertTrue(factory.isSingleton());
    }

    public void testGetObjectTypeDefaultsToPlainResourceInterfaceifLookupResourceIsNotSupplied() throws Exception {
        ResourceFactoryBean factory = new ResourceFactoryBean();
        assertEquals(Resource.class, factory.getObjectType());
    }

    public void testGetObjectTypeReturnsActualResourceLocationTypeWhenLookupResourceIsSupplied() throws Exception {
        ResourceFactoryBean factory = new ResourceFactoryBean();
        factory.setLocation(new StubResource());
        assertEquals(StubResource.class, factory.getObjectType());
    }

    public void testReturnsResourceAsIsInSunnyDayCase() throws Exception {
        MockControl mockResource = MockControl.createControl(Resource.class);
        Resource resource = (Resource) mockResource.getMock();
        mockResource.replay();

        ResourceFactoryBean factory = new ResourceFactoryBean();
        factory.setLocation(resource);
        factory.afterPropertiesSet();
        Object object = factory.getObject();

        assertNotNull("As per FactoryBean contract, the return value of getObject() cannot be null.", object);
        assertTrue("Obviously not getting a Resource back", Resource.class.isAssignableFrom(object.getClass()));
        assertSame("Not passing Resource location back as-is", resource, object);

        mockResource.verify();
    }

    public void testWhenResourceLocationIsMissing() throws Exception {
        new AssertThrows(IllegalArgumentException.class) {
            public void test() throws Exception {
                ResourceFactoryBean factory = new ResourceFactoryBean();
                factory.afterPropertiesSet();
            }
        }.runTest();
    }


    private static final class StubResource implements Resource {

        public boolean exists() {
            throw new UnsupportedOperationException();
        }

        public boolean isOpen() {
            throw new UnsupportedOperationException();
        }

        public URL getURL() {
            throw new UnsupportedOperationException();
        }

        public File getFile() {
            throw new UnsupportedOperationException();
        }

        public Resource createRelative(String relativePath) {
            throw new UnsupportedOperationException();
        }

        public String getFilename() {
            throw new UnsupportedOperationException();
        }

        public String getDescription() {
            throw new UnsupportedOperationException();
        }


        public InputStream getInputStream() {
            throw new UnsupportedOperationException();
        }

    }

}