revised embedded database support

org.springframework.core/src/main/java/org/springframework/core/io/ClassRelativeResourceLoader.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2002-2009 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.core.io;
+
+import org.springframework.util.Assert;
+import org.springframework.util.StringUtils;
+
+/**
+ * {@link ResourceLoader} implementation that interprets plain resource paths
+ * as relative to a given <code>java.lang.Class</code>.
+ *
+ * @author Juergen Hoeller
+ * @since 3.0
+ * @see java.lang.Class#getResource(String)
+ * @see ClassPathResource#ClassPathResource(String, Class)
+ */
+public class ClassRelativeResourceLoader extends DefaultResourceLoader {
+
+	private final Class clazz;
+
+
+	/**
+	 * Create a new ClassRelativeResourceLoader for the given class.
+	 * @param clazz the class to load resources through
+	 */
+	public ClassRelativeResourceLoader(Class clazz) {
+		Assert.notNull(clazz, "Class must not be null");
+		this.clazz = clazz;
+		setClassLoader(clazz.getClassLoader());
+	}
+
+	protected Resource getResourceByPath(String path) {
+		return new ClassRelativeContextResource(path, this.clazz);
+	}
+
+
+	/**
+	 * ClassPathResource that explicitly expresses a context-relative path
+	 * through implementing the ContextResource interface.
+	 */
+	private static class ClassRelativeContextResource extends ClassPathResource implements ContextResource {
+
+		private final Class clazz;
+
+		public ClassRelativeContextResource(String path, Class clazz) {
+			super(path, clazz);
+			this.clazz = clazz;
+		}
+
+		public String getPathWithinContext() {
+			return getPath();
+		}
+
+		@Override
+		public Resource createRelative(String relativePath) {
+			String pathToUse = StringUtils.applyRelativePath(getPath(), relativePath);
+			return new ClassRelativeContextResource(pathToUse, this.clazz);
+		}
+	}
+
+}