ecki commented on a change in pull request #85: VFS-760 Zkprovider URL: https://github.com/apache/commons-vfs/pull/85#discussion_r386645850
########## File path: commons-vfs2-zookeeper/src/main/java/org/apache/commons/vfs2/provider/zookeeper/ZkFileObject.java ########## @@ -0,0 +1,120 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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.apache.commons.vfs2.provider.zookeeper; + +import java.io.ByteArrayInputStream; +import java.io.InputStream; +import java.io.OutputStream; +import java.util.List; +import java.util.Objects; + +import org.apache.commons.vfs2.FileSystemException; +import org.apache.commons.vfs2.FileType; +import org.apache.commons.vfs2.provider.AbstractFileName; +import org.apache.commons.vfs2.provider.AbstractFileObject; +import org.apache.commons.vfs2.provider.UriParser; +import org.apache.curator.framework.CuratorFramework; +import org.apache.zookeeper.data.Stat; + +public class ZkFileObject extends AbstractFileObject<ZkFileSystem> { + + private CuratorFramework framework; + private String path; + private Stat stat; + + protected ZkFileObject(final AbstractFileName name, + final ZkFileSystem fileSystem, final CuratorFramework framework, + final String path) { + super(name, fileSystem); + this.framework = Objects.requireNonNull(framework); + this.path = Objects.requireNonNull(path); + } + + @Override + protected long doGetContentSize() throws Exception { + return this.stat.getDataLength(); + } + + @Override + protected InputStream doGetInputStream() throws Exception { + if (this.stat == null) { + throw new FileSystemException("vfs.provider/read-not-file.error", + getName()); + } + + final byte[] data = (this.stat.getDataLength() == 0) ? new byte[0] + : framework.getData().forPath(this.path); + return new ByteArrayInputStream(data); + } + + @Override + protected FileType doGetType() throws Exception { + return (this.stat == null) ? FileType.IMAGINARY : FileType.FILE_OR_FOLDER; + } + + /** + * Checks if this file is a folder by using its file type. ZooKeeper nodes can + * always be considered as folders or files. + * + * @return true if this file is a regular file. + * @throws FileSystemException if an error occurs. + * @see #getType() + * @see FileType#FOLDER + */ + @Override + public boolean isFolder() throws FileSystemException { + return true; + } + + @Override + protected String[] doListChildren() throws Exception { + if (this.stat == null || this.stat.getNumChildren() == 0) { + return new String[0]; + } + + List<String> children = framework.getChildren().forPath(this.path); + return UriParser.encode(children.toArray(new String[0])); + } + + @Override + protected void doAttach() throws Exception { + try { + this.stat = this.framework.checkExists().forPath(this.path); + } catch (final Exception e) { + this.stat = null; + } + } + + /** + * Determines if the file exists. + * + * @see org.apache.commons.vfs2.provider.AbstractFileObject#exists() + * @return boolean true if file exists, false if not + */ + @Override + public boolean exists() throws FileSystemException { + try { + doAttach(); + return this.stat != null; + } catch (final Exception e) { + throw new FileSystemException("Unable to check existance: {}", getName(), Review comment: > Would you prefer a change to the super function? Yes I think it should be type.hasChildren(). Not sure if that breaks tests, though. I agree to keep the overwrite for now, but it should check getType so it does not return true on virtual nodes. (But that part of the api might be a bit unclear..) ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services