org.datacleaner.extensions.ExtensionReader Maven / Gradle / Ivy
/**
* DataCleaner (community edition)
* Copyright (C) 2014 Neopost - Customer Information Management
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.datacleaner.extensions;
import java.io.File;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.apache.metamodel.util.FileHelper;
import org.datacleaner.util.StringUtils;
import org.datacleaner.util.FileFilters;
import org.datacleaner.util.ResourceManager;
import org.datacleaner.util.http.HttpXmlUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* Component used for reading {@link ExtensionPackage} objects from the
* classpath (aka. "Internal" extensions) and from external files (aka.
* "External" extensions).
*/
public class ExtensionReader {
private static final Logger logger = LoggerFactory.getLogger(ExtensionReader.class);
private final ResourceManager resourceManager = ResourceManager.get();
public List getInternalExtensions() {
final List extensionDescriptorUrls = resourceManager.getUrls("datacleaner-extension.xml");
List result = new ArrayList();
for (URL url : extensionDescriptorUrls) {
ExtensionPackage extension = getInternalExtension(url);
if (extension != null) {
result.add(extension);
}
}
return result;
}
private ExtensionPackage getInternalExtension(URL url) {
logger.info("Reading extension descriptor: {}", url);
try {
final InputStream inputStream = url.openStream();
try {
return readExtension(inputStream, new File[0]);
} finally {
FileHelper.safeClose(inputStream);
}
} catch (Exception e) {
logger.error("Error reading internal extension of URL: " + url, e);
}
return null;
}
public ExtensionPackage readExternalExtension(File fileOrDirectory) {
if (fileOrDirectory == null) {
return null;
}
if (!fileOrDirectory.isDirectory()) {
return readExternalExtension(new File[] { fileOrDirectory });
}
return readExternalExtension(fileOrDirectory.getName(), new File[] { fileOrDirectory });
}
public ExtensionPackage readExternalExtension(File[] files) {
return readExternalExtension(null, files);
}
public ExtensionPackage readExternalExtension(String name, final File[] files) {
final boolean autoDetectPackage;
final File[] jarFiles;
if (files.length == 1 && files[0].isDirectory()) {
jarFiles = files[0].listFiles(FileFilters.JAR);
autoDetectPackage = false;
} else {
jarFiles = files;
autoDetectPackage = true;
}
if (jarFiles.length == 0) {
return null;
}
// check if any of the files has an extension descriptor file
for (File file : jarFiles) {
if (file.getName().toLowerCase().endsWith(".jar")) {
try {
try (JarFile jarFile = new JarFile(file)) {
JarEntry entry = jarFile.getJarEntry("datacleaner-extension.xml");
if (entry == null) {
logger.info("No extension descriptor file (datacleaner-extension.xml) found in file: {}",
file);
} else {
final InputStream inputStream = jarFile.getInputStream(entry);
try {
final ExtensionPackage extension = readExtension(name, inputStream, jarFiles);
return extension;
} finally {
FileHelper.safeClose(inputStream);
}
}
}
} catch (Exception e) {
logger.error("Failed to read from JAR file", e);
}
}
}
// no extension descriptor files found
final String extensionName;
if (StringUtils.isNullOrEmpty(name)) {
final StringBuilder extensionNameBuilder = new StringBuilder();
for (File file : files) {
if (extensionNameBuilder.length() > 0) {
extensionNameBuilder.append(", ");
}
extensionNameBuilder.append(file.getName());
}
extensionName = extensionNameBuilder.toString();
} else {
extensionName = name;
}
final String packageName = (autoDetectPackage ? autoDetectPackageName(jarFiles[0]) : "");
final ExtensionPackage extension = new ExtensionPackage(extensionName, packageName, true, files);
return extension;
}
private ExtensionPackage readExtension(InputStream inputStream, File[] files) throws Exception {
return readExtension(null, inputStream, files);
}
private ExtensionPackage readExtension(String name, InputStream inputStream, File[] files) throws Exception {
final DocumentBuilder documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
final Document document = documentBuilder.parse(inputStream);
final Element documentElement = document.getDocumentElement();
if (StringUtils.isNullOrEmpty(name)) {
name = HttpXmlUtils.getChildNodeText(documentElement, "name");
}
final String scanPackage = HttpXmlUtils.getChildNodeText(documentElement, "package");
final ExtensionPackage extensionPackage = new ExtensionPackage(name, scanPackage, true, files);
final String description = HttpXmlUtils.getChildNodeText(documentElement, "description");
if (!StringUtils.isNullOrEmpty(description)) {
extensionPackage.getAdditionalProperties().put("description", description);
}
final String version = HttpXmlUtils.getChildNodeText(documentElement, "version");
if (!StringUtils.isNullOrEmpty(version)) {
extensionPackage.getAdditionalProperties().put("version", version);
}
final String icon = HttpXmlUtils.getChildNodeText(documentElement, "icon");
if (!StringUtils.isNullOrEmpty(icon)) {
extensionPackage.getAdditionalProperties().put("icon", icon);
}
final String url = HttpXmlUtils.getChildNodeText(documentElement, "url");
if (!StringUtils.isNullOrEmpty(url)) {
extensionPackage.getAdditionalProperties().put("url", url);
}
final String author = HttpXmlUtils.getChildNodeText(documentElement, "author");
if (!StringUtils.isNullOrEmpty(url)) {
extensionPackage.getAdditionalProperties().put("author", author);
}
return extensionPackage;
}
/**
* Auto-detects a package name based on a JAR file's contents (finding the
* common denominating package path)
*
* @param file
* @return
*/
public String autoDetectPackageName(File file) {
try {
Set packageNames = new HashSet();
try (JarFile jarFile = new JarFile(file)) {
Enumeration entries = jarFile.entries();
while (entries.hasMoreElements()) {
JarEntry entry = entries.nextElement();
String name = entry.getName();
if (name.endsWith(".class")) {
logger.debug("Considering package of entry '{}'", name);
int lastIndexOfSlash = name.lastIndexOf('/');
if (lastIndexOfSlash != -1) {
name = name.substring(0, lastIndexOfSlash);
packageNames.add(name);
}
}
}
}
if (packageNames.isEmpty()) {
return null;
}
logger.info("Found {} packages in extension jar: {}", packageNames.size(), packageNames);
// find the longest common prefix of all the package names
String packageName = StringUtils.getLongestCommonToken(packageNames, '/');
if (packageName == "") {
logger.debug("No common package prefix");
return null;
}
packageName = packageName.replace('/', '.');
return packageName;
} catch (Exception e) {
logger.warn("Error occurred while auto detecting package name", e);
return null;
}
}
}
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