content: /*
   * Copyright 2002-2018 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
   *
   *      https://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.alibaba.nacos.common.packagescan.resource;
  
  import com.alibaba.nacos.common.packagescan.util.AbstractAssert;
  import com.alibaba.nacos.common.packagescan.util.NestedIoException;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.URI;
  import java.net.URL;
  
  /**
   * Copy from https://github.com/spring-projects/spring-framework.git, with less modifications
   * JBoss VFS based {@link Resource} implementation.
   *
   * <p>As of Spring 4.0, this class supports VFS 3.x on JBoss AS 6+
   * (package {@code org.jboss.vfs}) and is in particular compatible with
   * JBoss AS 7 and WildFly 8+.
   *
   * @author Ales Justin
   * @author Juergen Hoeller
   * @author Costin Leau
   * @author Sam Brannen
   * @see org.jboss.vfs.VirtualFile
   * @since 3.0
   */
  public class VfsResource extends AbstractResource {
  
      private final Object resource;
  
      /**
       * Create a new {@code VfsResource} wrapping the given resource handle.
       *
       * @param resource a {@code org.jboss.vfs.VirtualFile} instance
       *                 (untyped in order to avoid a static dependency on the VFS API)
       */
      public VfsResource(Object resource) {
          AbstractAssert.notNull(resource, "VirtualFile must not be null");
          this.resource = resource;
      }
  
      @Override
      public InputStream getInputStream() throws IOException {
          return VfsUtils.getInputStream(this.resource);
      }
  
      @Override
      public boolean exists() {
          return VfsUtils.exists(this.resource);
      }
  
      @Override
      public boolean isReadable() {
          return VfsUtils.isReadable(this.resource);
      }
  
      @Override
      public URL getUrl() throws IOException {
          try {
              return VfsUtils.getUrl(this.resource);
          } catch (Exception ex) {
              throw new NestedIoException("Failed to obtain URL for file " + this.resource, ex);
          }
      }
  
      @Override
      public URI getUri() throws IOException {
          try {
              return VfsUtils.getUri(this.resource);
          } catch (Exception ex) {
              throw new NestedIoException("Failed to obtain URI for " + this.resource, ex);
          }
      }
  
      @Override
      public File getFile() throws IOException {
          return VfsUtils.getFile(this.resource);
      }
  
      @Override
      public long contentLength() throws IOException {
          return VfsUtils.getSize(this.resource);
      }
  
      @Override
      public long lastModified() throws IOException {
          return VfsUtils.getLastModified(this.resource);
      }
  
      @Override
      public Resource createRelative(String relativePath) throws IOException {
          if (!relativePath.startsWith(".") && relativePath.contains("/")) {
              try {
                  return new VfsResource(VfsUtils.getChild(this.resource, relativePath));
              } catch (IOException ex) {
                  // fall back to getRelative
              }
          }
  
          return new VfsResource(VfsUtils.getRelative(new URL(getUrl(), relativePath)));
      }
  
      @Override
      public String getFilename() {
          return VfsUtils.getName(this.resource);
      }
  
      @Override
      public String getDescription() {
          return "VFS resource [" + this.resource + "]";
      }
  
      @Override
      public boolean equals(Object other) {
          return (this == other || (other instanceof VfsResource
                  && this.resource.equals(((VfsResource) other).resource)));
      }
  
      @Override
      public int hashCode() {
          return this.resource.hashCode();
      }
  
  }
  