Java tutorial
/** * Copyright 2013 - 2017 WaveMaker, Inc. * * 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.wavemaker.commons.io; import java.io.InputStream; import org.apache.commons.lang3.StringUtils; import org.springframework.util.Assert; import org.springframework.util.ClassUtils; /** * Exposes a class-path resource as a read-only {@link File}. * * @author Phillip Webb */ public class ClassPathFile extends AbstractReadOnlyFile { private final ClassLoader classLoader; private final ResourcePath path; /** * Create a new {@link ClassPathFile} instance. * * @param path the path of the resource */ public ClassPathFile(String path) { this((ClassLoader) null, path); } /** * Create a new {@link ClassPathFile} instance. * * @param classLoader a {@link ClassLoader} or <tt>null</tt> to use the default * @param path the path of the resource */ public ClassPathFile(ClassLoader classLoader, String path) { this.path = new ResourcePath().get(path); this.classLoader = classLoader == null ? ClassUtils.getDefaultClassLoader() : classLoader; } /** * Create a new {@link ClassPathFile} instance. * * @param sourceClass the source class used to load the resource * @param path the path of the resource (relative to the sourceClass) */ public ClassPathFile(Class<?> sourceClass, String path) { Assert.notNull(sourceClass, "SourceClass must not be null"); Assert.hasLength(path, "Name must not be empty"); this.classLoader = sourceClass.getClassLoader(); this.path = new ResourcePath().get(sourceClass.getPackage().getName().replace(".", "/")).get(path); } @Override public String getName() { return this.path.getName(); } @Override public String toString(ResourceStringFormat format) { return this.path.toString(); } @Override public String toStringRelativeTo(Folder source) { Assert.notNull(source, "Source must not be null"); return this.path.toStringRelativeTo(source.toString()); } @Override public boolean isRelativeTo(Folder folder) { String relativePath = this.toStringRelativeTo(folder); return StringUtils.isNotBlank(relativePath); } @Override public File copyToIfNewer(Folder folder) { return null; } @Override protected InputStream getInputStream() { return this.classLoader.getResourceAsStream(this.path.toString().substring(1)); } }