resourcescriptsourcetests.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.scripting.support;

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

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;

/**
 * Unit and integration tests for the ResourceScriptSource class.
 *
 * @author Rick Evans
 */
public final class ResourceScriptSourceTests extends TestCase {

	public void testCtorWithNullResource() throws Exception {
		try {
			new ResourceScriptSource(null);
			fail("Must have thrown exception by this point.");
		}
		catch (IllegalArgumentException expected) {
		}
	}

	public void testDoesNotPropagateFatalExceptionOnResourceThatCannotBeResolvedToAFile() throws Exception {
		MockControl mock = MockControl.createControl(Resource.class);
		Resource resource = (Resource) mock.getMock();
		resource.getFile();
		mock.setThrowable(new IOException());
		mock.replay();

		ResourceScriptSource scriptSource = new ResourceScriptSource(resource);
		long lastModified = scriptSource.retrieveLastModifiedTime();
		assertEquals(0, lastModified);
		mock.verify();
	}

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

		ResourceScriptSource scriptSource = new ResourceScriptSource(resource);
		assertTrue(scriptSource.isModified());
		mock.verify();
	}

	public void testLastModifiedWorksWithResourceThatDoesNotSupportFileBasedReading() throws Exception {
		MockControl mock = MockControl.createControl(Resource.class);
		Resource resource = (Resource) mock.getMock();
		// underlying File is asked for so that the last modified time can be checked...
		resource.getFile();
		mock.setReturnValue(new TouchableFileStub(100));
		// underlying File is asked for so that the contents can be read in...
		resource.getFile();
		mock.setReturnValue(new TouchableFileStub(100));
		// does not support File-based reading; delegates to InputStream-style reading...
		resource.getInputStream();
		mock.setReturnValue(new ByteArrayInputStream("".getBytes()));
		// Mock the file 'not' changing; i.e. the File says it has not been modified
		resource.getFile();
		mock.setReturnValue(new TouchableFileStub(100));
		// And then mock the file changing; i.e. the File says it has been modified
		resource.getFile();
		mock.setReturnValue(new TouchableFileStub(200));
		mock.replay();

		ResourceScriptSource scriptSource = new ResourceScriptSource(resource);
		assertTrue("ResourceScriptSource must start off in the 'isModified' state (it obviously isn't).", scriptSource.isModified());
		scriptSource.getScriptAsString();
		assertFalse("ResourceScriptSource must not report back as being modified if the underlying File resource is not reporting a changed lastModified time.", scriptSource.isModified());
		// Must now report back as having been modified
		assertTrue("ResourceScriptSource must report back as being modified if the underlying File resource is reporting a changed lastModified time.", scriptSource.isModified());
		mock.verify();
	}

	public void testLastModifiedWorksWithResourceThatDoesNotSupportFileBasedAccessAtAll() throws Exception {
		MockControl mock = MockControl.createControl(Resource.class);
		Resource resource = (Resource) mock.getMock();
		// underlying File is asked for so that the last modified time can be checked...
		resource.getFile();
		mock.setThrowable(new IOException("Does not support access as a File."));
		// first time in, the script is always flagged as 'modified', so the underlying File is asked for so that the contents can be read in...
		resource.getFile();
		mock.setThrowable(new IOException("Does not support access as a File."));
		// does not support File-based access; delegates to InputStream-style reading...
		resource.getInputStream();
		mock.setReturnValue(new ByteArrayInputStream("".getBytes()));
		// ask for the file to check the modification date (will fail and return 0);
		resource.getFile();
		mock.setThrowable(new IOException("Does not support access as a File."));
		// ask for the file to check the modification date (will fail and return 0);
		resource.getFile();
		mock.setThrowable(new IOException("Does not support access as a File."));
		mock.replay();

		ResourceScriptSource scriptSource = new ResourceScriptSource(resource);
		assertTrue("ResourceScriptSource must start off in the 'isModified' state (it obviously isn't).", scriptSource.isModified());
		scriptSource.getScriptAsString();
		assertFalse("ResourceScriptSource must not report back as being modified if the underlying File resource is not reporting a changed lastModified time.", scriptSource.isModified());
		// Must now continue to report back as not having been modified 'cos the Resource does not support access as a File (and so the lastModified date cannot be determined).
		assertFalse("ResourceScriptSource must not report back as being modified if the underlying File resource is not reporting a changed lastModified time.", scriptSource.isModified());
		mock.verify();
	}


	private static final class TouchableFileStub extends File {

		private long lastModified;

		public TouchableFileStub(long lastModified) {
			super("");
			this.lastModified = lastModified;
		}

		public long lastModified() {
			return this.lastModified;
		}
	}

}