jodd.io.findfile.ClassFinder Maven / Gradle / Ivy
Show all versions of jodd-core Show documentation
// Copyright (c) 2003-2014, Jodd Team (jodd.org). All Rights Reserved.
package jodd.io.findfile;
import jodd.io.FileNameUtil;
import jodd.util.StringUtil;
import jodd.util.Wildcard;
import jodd.util.ArraysUtil;
import jodd.io.FileUtil;
import jodd.io.StreamUtil;
import jodd.io.ZipUtil;
import java.net.URL;
import java.util.zip.ZipFile;
import java.util.zip.ZipEntry;
import java.util.Enumeration;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.FileNotFoundException;
/**
* Simple utility that scans URLs for classes.
* Its purpose is to help scanning class paths for some classes.
* Content of Jar files is also examined.
*
* All paths are matched using {@link Wildcard#matchPath(String, String) path-style}
* wildcard matcher. All entries are matched using {@link Wildcard#match(String, String) common-style}
* wildcard matcher.
* @see ClassScanner
*/
public abstract class ClassFinder {
private static final String CLASS_FILE_EXT = ".class";
private static final String JAR_FILE_EXT = ".jar";
// ---------------------------------------------------------------- excluded jars
/**
* Array of system jars that are excluded from the search.
* By default, these paths are common for linux, windows and mac.
*/
protected static String[] systemJars = new String[] {
"**/jre/lib/*.jar",
"**/jre/lib/ext/*.jar",
"**/Java/Extensions/*.jar",
"**/Classes/*.jar"
};
/**
* Array of excluded jars.
*/
protected String[] excludedJars;
/**
* Array of jar file name patterns that are included in the search.
* This rule is applied after the excluded rule.
*/
protected String[] includedJars;
/**
* Returns system jars.
*/
public static String[] getSystemJars() {
return systemJars;
}
/**
* Specifies system jars, that are always excluded first.
*/
public static void setSystemJars(String... newSystemJars) {
systemJars = newSystemJars;
}
public String[] getExcludedJars() {
return excludedJars;
}
public void setExcludedJars(String... excludedJars) {
this.excludedJars = excludedJars;
}
public String[] getIncludedJars() {
return includedJars;
}
public void setIncludedJars(String... includedJars) {
this.includedJars = includedJars;
}
// ---------------------------------------------------------------- included packages
protected String[] includedEntries; // array of included name patterns
protected String[] excludedEntries; // array of excluded name patterns
public String[] getIncludedEntries() {
return includedEntries;
}
/**
* Sets included set of names that will be considered during configuration,
*/
public void setIncludedEntries(String... includedEntries) {
this.includedEntries = includedEntries;
}
public String[] getExcludedEntries() {
return excludedEntries;
}
/**
* Sets excluded names that narrows included set of packages.
*/
public void setExcludedEntries(String... excludedEntries) {
this.excludedEntries = excludedEntries;
}
// ---------------------------------------------------------------- implementation
/**
* If set to true all files will be scanned and not only classes.
*/
protected boolean includeResources;
/**
* If set to true exceptions for entry scans are ignored.
*/
protected boolean ignoreException;
public boolean isIncludeResources() {
return includeResources;
}
public void setIncludeResources(boolean includeResources) {
this.includeResources = includeResources;
}
public boolean isIgnoreException() {
return ignoreException;
}
/**
* Sets if exceptions during scanning process should be ignored or not.
*/
public void setIgnoreException(boolean ignoreException) {
this.ignoreException = ignoreException;
}
// ---------------------------------------------------------------- scan
/**
* Scans several URLs. If (#ignoreExceptions} is set, exceptions
* per one URL will be ignored and loops continues.
*/
protected void scanUrls(URL... urls) {
for (URL path : urls) {
scanUrl(path);
}
}
/**
* Scans single URL for classes and jar files.
* Callback {@link #onEntry(EntryData)} is called on
* each class name.
*/
protected void scanUrl(URL url) {
File file = FileUtil.toFile(url);
if (file == null) {
if (ignoreException == false) {
throw new FindFileException("URL is not a valid file: " + url);
}
}
scanPath(file);
}
protected void scanPaths(File... paths) {
for (File path : paths) {
scanPath(path);
}
}
protected void scanPaths(String... paths) {
for (String path : paths) {
scanPath(path);
}
}
protected void scanPath(String path) {
scanPath(new File(path));
}
/**
* Returns true if some JAR file has to be accepted.
* The following logic is provided by default, in given order:
*
* - system jars are excluded
* - excluded jars are excluded (if specified)
* - only included jars are included (if specified)
*
*/
protected boolean acceptJar(File jarFile) {
String path = jarFile.getAbsolutePath();
path = FileNameUtil.separatorsToUnix(path);
if (systemJars != null) {
int ndx = Wildcard.matchPathOne(path, systemJars);
if (ndx != -1) {
return false;
}
}
if (excludedJars != null) {
int ndx = Wildcard.matchPathOne(path, excludedJars);
if (ndx != -1) {
return false;
}
}
if (includedJars != null) {
int ndx = Wildcard.matchPathOne(path, includedJars);
if (ndx == -1) {
return false;
}
}
return true;
}
/**
* Scans single path.
*/
protected void scanPath(File file) {
String path = file.getAbsolutePath();
if (StringUtil.endsWithIgnoreCase(path, JAR_FILE_EXT) == true) {
if (acceptJar(file) == false) {
return;
}
scanJarFile(file);
} else if (file.isDirectory() == true) {
scanClassPath(file);
}
}
// ---------------------------------------------------------------- internal
/**
* Scans classes inside single JAR archive. Archive is scanned as a zip file.
* @see #onEntry(EntryData)
*/
protected void scanJarFile(File file) {
ZipFile zipFile;
try {
zipFile = new ZipFile(file);
} catch (IOException ioex) {
if (ignoreException == false) {
throw new FindFileException("Invalid zip: " + file.getName(), ioex);
}
return;
}
Enumeration entries = zipFile.entries();
while (entries.hasMoreElements()) {
ZipEntry zipEntry = (ZipEntry) entries.nextElement();
String zipEntryName = zipEntry.getName();
try {
if (StringUtil.endsWithIgnoreCase(zipEntryName, CLASS_FILE_EXT)) {
String entryName = prepareEntryName(zipEntryName, true);
EntryData entryData = new EntryData(entryName, zipFile, zipEntry);
try {
scanEntry(entryData);
} finally {
entryData.closeInputStreamIfOpen();
}
} else if (includeResources == true) {
String entryName = prepareEntryName(zipEntryName, false);
EntryData entryData = new EntryData(entryName, zipFile, zipEntry);
try {
scanEntry(entryData);
} finally {
entryData.closeInputStreamIfOpen();
}
}
} catch (RuntimeException rex) {
if (ignoreException == false) {
ZipUtil.close(zipFile);
throw rex;
}
}
}
ZipUtil.close(zipFile);
}
/**
* Scans single classpath directory.
* @see #onEntry(EntryData)
*/
protected void scanClassPath(File root) {
String rootPath = root.getAbsolutePath();
if (rootPath.endsWith(File.separator) == false) {
rootPath += File.separatorChar;
}
FindFile ff = new FindFile().setIncludeDirs(false).setRecursive(true).searchPath(rootPath);
File file;
while ((file = ff.nextFile()) != null) {
String filePath = file.getAbsolutePath();
try {
if (StringUtil.endsWithIgnoreCase(filePath, CLASS_FILE_EXT)) {
scanClassFile(filePath, rootPath, file, true);
} else if (includeResources == true) {
scanClassFile(filePath, rootPath, file, false);
}
} catch (RuntimeException rex) {
if (ignoreException == false) {
throw rex;
}
}
}
}
protected void scanClassFile(String filePath, String rootPath, File file, boolean isClass) {
if (StringUtil.startsWithIgnoreCase(filePath, rootPath) == true) {
String entryName = prepareEntryName(filePath.substring(rootPath.length()), isClass);
EntryData entryData = new EntryData(entryName, file);
try {
scanEntry(entryData);
} finally {
entryData.closeInputStreamIfOpen();
}
}
}
/**
* Prepares resource and class names. For classes, it strips '.class' from the end and converts
* all (back)slashes to dots. For resources, it replaces all backslashes to slashes.
*/
protected String prepareEntryName(String name, boolean isClass) {
String entryName = name;
if (isClass) {
entryName = name.substring(0, name.length() - 6); // 6 == ".class".length()
entryName = StringUtil.replaceChar(entryName, '/', '.');
entryName = StringUtil.replaceChar(entryName, '\\', '.');
} else {
entryName = '/' + StringUtil.replaceChar(entryName, '\\', '/');
}
return entryName;
}
/**
* Returns true if some entry name has to be accepted.
* @see #prepareEntryName(String, boolean)
* @see #scanEntry(EntryData)
*/
protected boolean acceptEntry(String entryName) {
if (excludedEntries != null) {
if (Wildcard.matchOne(entryName, excludedEntries) != -1) {
return false;
}
}
if (includedEntries != null) {
if (Wildcard.matchOne(entryName, includedEntries) == -1) {
return false;
}
}
return true;
}
/**
* If entry name is {@link #acceptEntry(String) accepted} invokes {@link #onEntry(EntryData)} a callback}.
*/
protected void scanEntry(EntryData entryData) {
if (acceptEntry(entryData.getName()) == false) {
return;
}
try {
onEntry(entryData);
} catch (Exception ex) {
throw new FindFileException("Scan entry error: " + entryData, ex);
}
}
// ---------------------------------------------------------------- callback
/**
* Called during classpath scanning when class or resource is found.
*
* - Class name is java-alike class name (pk1.pk2.class) that may be immediately used
* for dynamic loading.
* - Resource name starts with '\' and represents either jar path (\pk1/pk2/res) or relative file path (\pk1\pk2\res).
*
*
* InputStream is provided by InputStreamProvider and opened lazy.
* Once opened, input stream doesn't have to be closed - this is done by this class anyway.
*/
protected abstract void onEntry(EntryData entryData) throws Exception;
// ---------------------------------------------------------------- utilities
/**
* Returns type signature bytes used for searching in class file.
*/
protected byte[] getTypeSignatureBytes(Class type) {
String name = 'L' + type.getName().replace('.', '/') + ';';
return name.getBytes();
}
/**
* Returns true if class contains {@link #getTypeSignatureBytes(Class) type signature}.
* It searches the class content for bytecode signature. This is the fastest way of finding if come
* class uses some type. Please note that if signature exists it still doesn't means that class uses
* it in expected way, therefore, class should be loaded to complete the scan.
*/
protected boolean isTypeSignatureInUse(InputStream inputStream, byte[] bytes) {
try {
byte[] data = StreamUtil.readBytes(inputStream);
int index = ArraysUtil.indexOf(data, bytes);
return index != -1;
} catch (IOException ioex) {
throw new FindFileException("Read error", ioex);
}
}
// ---------------------------------------------------------------- provider
/**
* Provides input stream on demand. Input stream is not open until get().
*/
protected static class EntryData {
private final File file;
private final ZipFile zipFile;
private final ZipEntry zipEntry;
private final String name;
EntryData(String name, ZipFile zipFile, ZipEntry zipEntry) {
this.name = name;
this.zipFile = zipFile;
this.zipEntry = zipEntry;
this.file = null;
inputStream = null;
}
EntryData(String name, File file) {
this.name = name;
this.file = file;
this.zipEntry = null;
this.zipFile = null;
inputStream = null;
}
private InputStream inputStream;
/**
* Returns entry name.
*/
public String getName() {
return name;
}
/**
* Returns true if archive.
*/
public boolean isArchive() {
return zipFile != null;
}
/**
* Returns archive name or null if entry is not inside archived file.
*/
public String getArchiveName() {
if (zipFile != null) {
return zipFile.getName();
}
return null;
}
/**
* Opens zip entry or plain file and returns its input stream.
*/
public InputStream openInputStream() {
if (zipFile != null) {
try {
inputStream = zipFile.getInputStream(zipEntry);
return inputStream;
} catch (IOException ioex) {
throw new FindFileException("Input stream error: '" + zipFile.getName()
+ "', entry: '" + zipEntry.getName() + "'." , ioex);
}
}
try {
inputStream = new FileInputStream(file);
return inputStream;
} catch (FileNotFoundException fnfex) {
throw new FindFileException("Unable to open: " + file.getAbsolutePath(), fnfex);
}
}
/**
* Closes input stream if opened.
*/
void closeInputStreamIfOpen() {
if (inputStream == null) {
return;
}
StreamUtil.close(inputStream);
inputStream = null;
}
@Override
public String toString() {
return "EntryData{" + name + '\'' +'}';
}
}
}