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/*
* 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.openjpa.lib.meta;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang.exception.NestableRuntimeException;
import org.apache.openjpa.lib.util.Files;
import org.apache.openjpa.lib.util.J2DoPrivHelper;
import org.apache.openjpa.lib.util.Localizer;
import serp.bytecode.lowlevel.ConstantPoolTable;
import serp.util.Strings;
/**
* Parser used to resolve arguments into java classes.
* Interprets command-line args as either class names, .class files or
* resources, .java files or resources, or metadata files or resources
* conforming to the common format defined by {@link CFMetaDataParser}.
* Transforms the information in these args into {@link Class} instances.
* Note that when parsing .java files, only the main class in the file
* is detected. Other classes defined in the file, such as inner classes,
* are not added to the returned classes list.
*
* @author Abe White
*/
public class ClassArgParser {
private static final int TOKEN_EOF = -1;
private static final int TOKEN_NONE = 0;
private static final int TOKEN_PACKAGE = 1;
private static final int TOKEN_CLASS = 2;
private static final int TOKEN_PACKAGE_NOATTR = 3;
private static final int TOKEN_CLASS_NOATTR = 4;
private static final Localizer _loc = Localizer.forPackage
(ClassArgParser.class);
private ClassLoader _loader = null;
private char[] _packageAttr = "name".toCharArray();
private char[] _classAttr = "name".toCharArray();
private char[][] _beginElements = { { 'p' }, { 'c' } };
private char[][] _endElements = { "ackage".toCharArray(),
"lass".toCharArray() };
/**
* The class loader with which to load parsed classes.
*/
public ClassLoader getClassLoader() {
return _loader;
}
/**
* The class loader with which to load parsed classes.
*/
public void setClassLoader(ClassLoader loader) {
_loader = loader;
}
/**
* Set the the relevant metadata file structure so that metadata files
* containing class names can be parsed. Null attribute names indicate
* that the text content of the element contains the data.
*/
public void setMetaDataStructure(String packageElementName,
String packageAttributeName, String[] classElementNames,
String classAttributeName) {
// calculate how many chars deep we have to go to identify each element
// name as unique. this is extremely inefficient for large N, but
// should never be called for more than a few elements
char[] buf = new char[classElementNames.length + 1];
int charIdx = 0;
for (; true; charIdx++) {
for (int i = 0; i < buf.length; i++) {
if (i == 0) {
if (charIdx == packageElementName.length())
throw new UnsupportedOperationException(_loc.get
("cant-diff-elems").getMessage());
buf[i] = packageElementName.charAt(charIdx);
} else {
if (charIdx == classElementNames[i - 1].length())
throw new UnsupportedOperationException(_loc.get
("cant-diff-elems").getMessage());
buf[i] = classElementNames[i - 1].charAt(charIdx);
}
}
if (charsUnique(buf))
break;
}
_packageAttr = (packageAttributeName == null) ? null
: packageAttributeName.toCharArray();
_classAttr = (classAttributeName == null) ? null
: classAttributeName.toCharArray();
_beginElements = new char[classElementNames.length + 1][];
_endElements = new char[classElementNames.length + 1][];
_beginElements[0] = packageElementName.substring(0, charIdx + 1).
toCharArray();
_endElements[0] = packageElementName.substring(charIdx + 1).
toCharArray();
for (int i = 0; i < classElementNames.length; i++) {
_beginElements[i + 1] = classElementNames[i].
substring(0, charIdx + 1).toCharArray();
_endElements[i + 1] = classElementNames[i].
substring(charIdx + 1).toCharArray();
}
}
/**
* Return true if all characters in given buffer are unique.
*/
private static boolean charsUnique(char[] buf) {
for (int i = buf.length - 1; i >= 0; i--)
for (int j = 0; j < i; j++)
if (buf[j] == buf[i])
return false;
return true;
}
/**
* Return the {@link Class} representation of the class(es) named in the
* given arg.
*
* @param arg a class name, .java file, .class file, or metadata
* file naming the type(s) to act on
*/
public Class[] parseTypes(String arg) {
String[] names = parseTypeNames(arg);
Class[] objs = new Class[names.length];
for (int i = 0; i < names.length; i++)
objs[i] = Strings.toClass(names[i], _loader);
return objs;
}
/**
* Return the {@link Class} representation of the class(es) named in the
* given metadatas.
*/
public Class[] parseTypes(MetaDataIterator itr) {
String[] names = parseTypeNames(itr);
Class[] objs = new Class[names.length];
for (int i = 0; i < names.length; i++)
objs[i] = Strings.toClass(names[i], _loader);
return objs;
}
/**
* Return a mapping of each metadata resource to an array of its
* contained classes.
*/
public Map[]> mapTypes(MetaDataIterator itr) {
Map map = mapTypeNames(itr);
Map[]> rval = new HashMap[]>();
Map.Entry entry;
String[] names;
Class[] objs;
for (Iterator> i =
map.entrySet().iterator(); i.hasNext();) {
entry = i.next();
names = entry.getValue();
objs = new Class[names.length];
for (int j = 0; j < names.length; j++) {
objs[j] = Strings.toClass(names[j], _loader);
}
rval.put(entry.getKey(), objs);
}
return rval;
}
/**
* Return the names of the class(es) from the given arg.
*
* @param arg a class name, .java file, .class file, or metadata
* file naming the type(s) to act on
* @throws IllegalArgumentException with appropriate message on error
*/
public String[] parseTypeNames(String arg) {
if (arg == null)
return new String[0];
try {
File file = Files.getFile(arg, _loader);
if (arg.endsWith(".class"))
return new String[]{ getFromClassFile(file) };
if (arg.endsWith(".java"))
return new String[]{ getFromJavaFile(file) };
if ((AccessController.doPrivileged(
J2DoPrivHelper.existsAction(file))).booleanValue()) {
Collection col = getFromMetaDataFile(file);
return col.toArray(new String[col.size()]);
}
} catch (Exception e) {
throw new NestableRuntimeException(
_loc.get("class-arg", arg).getMessage(), e);
}
// must be a class name
return new String[]{ arg };
}
/**
* Return the names of the class(es) from the given metadatas.
*/
public String[] parseTypeNames(MetaDataIterator itr) {
if (itr == null)
return new String[0];
List names = new ArrayList();
Object source = null;
try {
while (itr.hasNext()) {
source = itr.next();
appendTypeNames(source, itr.getInputStream(), names);
}
} catch (Exception e) {
throw new NestableRuntimeException(
_loc.get("class-arg", source).getMessage(), e);
}
return names.toArray(new String[names.size()]);
}
/**
* Parse the names in the given metadata iterator stream, closing the
* stream on completion.
*/
private void appendTypeNames(Object source, InputStream in,
List names) throws IOException {
try {
if (source.toString().endsWith(".class"))
names.add(getFromClass(in));
names.addAll(getFromMetaData(new InputStreamReader(in)));
} finally {
try {
in.close();
} catch (IOException ioe) {
}
}
}
/**
* Return a mapping of each metadata resource to an array of its contained
* class names.
*/
public Map mapTypeNames(MetaDataIterator itr) {
if (itr == null)
return Collections.emptyMap();
Map map = new HashMap();
Object source = null;
List names = new ArrayList();
try {
while (itr.hasNext()) {
source = itr.next();
appendTypeNames(source, itr.getInputStream(), names);
if (!names.isEmpty()) {
map.put(source, names.toArray(new String[names.size()]));
}
names.clear();
}
} catch (Exception e) {
throw new NestableRuntimeException(
_loc.get("class-arg", source).getMessage(), e);
}
return map;
}
/**
* Returns the class named in the given .class file.
*/
private String getFromClassFile(File file) throws IOException {
FileInputStream fin = null;
try {
fin = AccessController.doPrivileged(
J2DoPrivHelper.newFileInputStreamAction(file));
return getFromClass(fin);
} catch (PrivilegedActionException pae) {
throw (FileNotFoundException) pae.getException();
} finally {
if (fin != null)
try {
fin.close();
} catch (IOException ioe) {
}
}
}
/**
* Returns the class name in the given .class bytecode.
*/
private String getFromClass(InputStream in) throws IOException {
ConstantPoolTable table = new ConstantPoolTable(in);
int idx = table.getEndIndex();
idx += 2; // access flags
int clsEntry = table.readUnsignedShort(idx);
int utfEntry = table.readUnsignedShort(table.get(clsEntry));
return table.readString(table.get(utfEntry)).replace('/', '.');
}
/**
* Returns the class named in the given .java file.
*/
private String getFromJavaFile(File file) throws IOException {
BufferedReader in = null;
try {
// find the line with the package declaration
in = new BufferedReader(new FileReader(file));
String line;
StringBuilder pack = null;
while ((line = in.readLine()) != null) {
line = line.trim();
if (line.startsWith("package ")) {
line = line.substring(8).trim();
// strip off anything beyond the package declaration
pack = new StringBuilder();
for (int i = 0; i < line.length(); i++) {
if (Character.isJavaIdentifierPart(line.charAt(i))
|| line.charAt(i) == '.')
pack.append(line.charAt(i));
else
break;
}
break;
}
}
// strip '.java'
String clsName = file.getName();
clsName = clsName.substring(0, clsName.length() - 5);
// prefix with package
if (pack != null && pack.length() > 0)
clsName = pack + "." + clsName;
return clsName;
} finally {
if (in != null)
try { in.close(); } catch (IOException ioe) {}
}
}
/**
* Returns the classes named in the given common format metadata file.
*/
private Collection getFromMetaDataFile(File file)
throws IOException {
FileReader in = null;
try {
in = new FileReader(file);
return getFromMetaData(in);
} finally {
if (in != null)
try {
in.close();
} catch (IOException ioe) {
}
}
}
/**
* Returns the classes named in the given common format metadata stream.
*/
private Collection getFromMetaData(Reader xml) throws IOException {
Collection names = new ArrayList();
BufferedReader in = new BufferedReader(xml);
boolean comment = false;
int token = TOKEN_NONE;
String pkg = "";
String name;
read:
for (int ch = 0, last = 0, last2 = 0;
ch == '<' || (ch = in.read()) != -1; last2 = last, last = ch) {
// handle comments
if (comment && last2 == '-' && last == '-' && ch == '>') {
comment = false;
continue;
}
if (comment) {
if (ch == '<') {
ch = in.read();
if (ch == -1)
break read;
}
continue;
}
if (last2 == '<' && last == '!' && ch == '-') {
comment = true;
continue;
}
// if not an element start, skip it
if (ch != '<')
continue;
token = TOKEN_NONE; // reset token
last = ch; // update needed for comment detection
ch = readThroughWhitespace(in);
if (ch == '/' || ch == '!' || ch == '?')
continue;
// read element name; look for packages and classes
token = readElementToken(ch, in);
switch (token) {
case TOKEN_EOF:
break read;
case TOKEN_PACKAGE:
pkg = readAttribute(in, _packageAttr);
if (pkg == null)
break read;
break;
case TOKEN_PACKAGE_NOATTR:
pkg = readElementText(in);
if (pkg == null)
break read;
ch = '<'; // reading element text reads to next '<'
break;
case TOKEN_CLASS:
name = readAttribute(in, _classAttr);
if (name == null)
break read;
if (pkg.length() > 0 && name.indexOf('.') == -1)
names.add(pkg + "." + name);
else
names.add(name);
break;
case TOKEN_CLASS_NOATTR:
name = readElementText(in);
if (name == null)
break read;
ch = '<'; // reading element text reads to next '<'
if (pkg.length() > 0 && name.indexOf('.') == -1)
names.add(pkg + "." + name);
else
names.add(name);
break;
}
}
return names;
}
/**
* Read the name of the current XML element and return the matching token.
*/
private int readElementToken(int ch, Reader in) throws IOException {
// look through the beginning element names to find what element this
// might be(if any)
int matchIdx = -1;
int matched = 0;
int dq = 0;
for (int beginIdx = 0; beginIdx < _beginElements[0].length; beginIdx++)
{
if (beginIdx != 0)
ch = in.read();
if (ch == -1)
return TOKEN_EOF;
matched = 0;
for (int i = 0; i < _beginElements.length; i++) {
if ((dq & (2 << i)) != 0)
continue;
if (ch == _beginElements[i][beginIdx]) {
matchIdx = i;
matched++;
} else
dq |= 2 << i;
}
if (matched == 0)
break;
}
if (matched != 1)
return TOKEN_NONE;
// make sure the rest of the element name matches
char[] match = _endElements[matchIdx];
for (int i = 0; i < match.length; i++) {
ch = in.read();
if (ch == -1)
return TOKEN_EOF;
if (ch != match[i])
return TOKEN_NONE;
}
// read the next char to make sure we finished the element name
ch = in.read();
if (ch == -1)
return TOKEN_EOF;
if (ch == '>') {
if (matchIdx == 0 && _packageAttr == null)
return TOKEN_PACKAGE_NOATTR;
if (matchIdx != 0 && _classAttr == null)
return TOKEN_CLASS_NOATTR;
} else if (Character.isWhitespace((char) ch)) {
if (matchIdx == 0 && _packageAttr != null)
return TOKEN_PACKAGE;
if (matchIdx != 0 && _classAttr != null)
return TOKEN_CLASS;
}
return TOKEN_NONE;
}
/**
* Read the attribute with the given name in chars of the current XML
* element.
*/
private String readAttribute(Reader in, char[] name) throws IOException {
int expected = 0;
for (int ch, last = 0; true; last = ch) {
ch = in.read();
if (ch == -1)
return null;
if (ch == '>')
return "";
// if not expected char or still looking for 'n' and previous
// char is not whitespace, keep looking
if (ch != name[expected] || (expected == 0 && last != 0
&& !Character.isWhitespace((char) last))) {
expected = 0;
continue;
}
// found expected char; have we found the whole "name"?
expected++;
if (expected == name.length) {
// make sure the next char is '='
ch = readThroughWhitespace(in);
if (ch == -1)
return null;
if (ch != '=') {
expected = 0;
continue;
}
// toss out any subsequent whitespace and the next char, which
// is the opening quote for the attr value, then read until the
// closing quote
readThroughWhitespace(in);
return readAttributeValue(in);
}
}
}
/**
* Read the current text value until the next element.
*/
private String readElementText(Reader in) throws IOException {
StringBuilder buf = null;
int ch;
while (true) {
ch = in.read();
if (ch == -1)
return null;
if (ch == '<')
break;
if (Character.isWhitespace((char) ch))
continue;
if (buf == null)
buf = new StringBuilder();
buf.append((char) ch);
}
return (buf == null) ? "" : buf.toString();
}
/**
* Read until the next non-whitespace character.
*/
private int readThroughWhitespace(Reader in) throws IOException {
int ch;
while (true) {
ch = in.read();
if (ch == -1 || !Character.isWhitespace((char) ch))
return ch;
}
}
/**
* Return the current attribute value.
*/
private String readAttributeValue(Reader in) throws IOException {
StringBuilder buf = new StringBuilder();
int ch;
while (true) {
ch = in.read();
if (ch == -1)
return null;
if (ch == '\'' || ch == '"')
return buf.toString();
buf.append((char) ch);
}
}
}
