/*
* Copyright (c) 1998-2010 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.config.type;
import com.caucho.config.Config;
import com.caucho.el.ELParser;
import com.caucho.el.Expr;
import com.caucho.util.L10N;
import com.caucho.vfs.Path;
import com.caucho.vfs.Vfs;
import javax.el.ELContext;
import javax.el.ELException;
public class PathType extends ConfigType
{
private static final L10N L = new L10N(PathType.class);
public static final PathType TYPE = new PathType();
private PathType()
{
}
/**
* Returns the path class.
*/
public Class getType()
{
return Path.class;
}
/**
* Returns the type's configured value
*
* @param builder the context builder
* @param node the configuration node
* @param parent
*/
@Override
public Object valueOf(String text)
{
return lookupPath(text);
}
/**
* Converts the value to a value of the type.
*/
@Override
public Object valueOf(Object value)
{
if (value instanceof Path)
return value;
if (value instanceof String)
return valueOf((String) value);
else if (value == null)
return null;
else
return valueOf(String.valueOf(value));
}
public static Path lookupPath(String string)
throws ELException
{
return lookupPath(string,
Config.getEnvironment(),
Vfs.lookup());
}
public static Path lookupPath(String string, ELContext env)
throws ELException
{
return lookupPath(string, env, Vfs.lookup());
}
public static Path lookupPath(String string, ELContext env, Path pwd)
throws ELException
{
if (env == null)
env = Config.getEnvironment();
string = rewritePathString(string);
Expr expr = new ELParser(env, string).parse();
Object obj = expr.evalObject(env);
if (obj == null)
throw new NullPointerException(L.l("Path '{0}' evaluated to null.",
string));
if (obj instanceof Path)
return (Path) obj;
String value = Expr.toString(obj, env);
if (pwd != null)
return pwd.lookup(value);
else
return Vfs.lookup(value);
}
/**
* Rewrites the path string into proper JSP EL.
*
* Returns the native path for a configured path name. The special cases
* $app-dir and $resin-home specify the root directory.
*
* @return a real path corresponding to the path name
*/
public static String rewritePathString(String pathName)
{
if (pathName == null)
return ".";
StringBuilder cb = new StringBuilder();
int length = pathName.length();
for (int i = 0; i < length; i++) {
char ch = pathName.charAt(i);
if (ch != '$') {
cb.append(ch);
continue;
}
if (i + 1 == length) {
cb.append('$');
continue;
}
ch = pathName.charAt(i + 1);
if ('0' <= ch && ch <= '9') {
int value = 0;
for (i++;
i < length && (ch = pathName.charAt(i)) >= '0' && ch <= '9';
i++) {
value = 10 * value + ch - '0';
}
i--;
cb.append("${regexp[" + value + "]}");
}
else if ('a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z') {
int tail = i + 1;
for (; tail < length; tail++) {
ch = pathName.charAt(tail);
if (ch == '/' || ch == '\\' || ch == '$')
break;
}
cb.append("${" + pathName.substring(i + 1, tail) + "}");
i = tail - 1;
}
else
cb.append('$');
}
return cb.toString();
}
}