org.jboss.ejb.client.PropertiesValueResolver Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including
all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and
Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.ejb.client;
import java.io.File;
/**
* Parses a string and replaces any references to system properties or environment variables in the string
*
* @author Jaikiran Pai (copied from JBoss DMR project)
* @author David M. Lloyd
*/
class PropertiesValueResolver {
private static final int INITIAL = 0;
private static final int GOT_DOLLAR = 1;
private static final int GOT_OPEN_BRACE = 2;
private static final int RESOLVED = 3;
private static final int DEFAULT = 4;
/**
* Replace properties of the form:
* ${<[env.]name>[,<[env.]name2>[,<[env.]name3>...]][:<default>]}
*
* @param value - either a system property or environment variable reference
* @return the value of the system property or environment variable referenced if
* it exists
*/
public static String replaceProperties(final String value) {
final StringBuilder builder = new StringBuilder();
final int len = value.length();
int state = INITIAL;
int start = -1;
int nameStart = -1;
String resolvedValue = null;
for (int i = 0; i < len; i = value.offsetByCodePoints(i, 1)) {
final int ch = value.codePointAt(i);
switch (state) {
case INITIAL: {
switch (ch) {
case '$': {
state = GOT_DOLLAR;
continue;
}
default: {
builder.appendCodePoint(ch);
continue;
}
}
// not reachable
}
case GOT_DOLLAR: {
switch (ch) {
case '$': {
builder.appendCodePoint(ch);
state = INITIAL;
continue;
}
case '{': {
start = i + 1;
nameStart = start;
state = GOT_OPEN_BRACE;
continue;
}
default: {
// invalid; emit and resume
builder.append('$').appendCodePoint(ch);
state = INITIAL;
continue;
}
}
// not reachable
}
case GOT_OPEN_BRACE: {
switch (ch) {
case ':':
case '}':
case ',': {
final String name = value.substring(nameStart, i).trim();
if ("/".equals(name)) {
builder.append(File.separator);
state = ch == '}' ? INITIAL : RESOLVED;
continue;
} else if (":".equals(name)) {
builder.append(File.pathSeparator);
state = ch == '}' ? INITIAL : RESOLVED;
continue;
}
// First check for system property, then env variable
String val = System.getProperty(name);
if (val == null && name.startsWith("env."))
val = System.getenv(name.substring(4));
if (val != null) {
builder.append(val);
resolvedValue = val;
state = ch == '}' ? INITIAL : RESOLVED;
continue;
} else if (ch == ',') {
nameStart = i + 1;
continue;
} else if (ch == ':') {
start = i + 1;
state = DEFAULT;
continue;
} else {
throw new IllegalStateException("Failed to resolve expression: " + value.substring(start - 2, i + 1));
}
}
default: {
continue;
}
}
// not reachable
}
case RESOLVED: {
if (ch == '}') {
state = INITIAL;
}
continue;
}
case DEFAULT: {
if (ch == '}') {
state = INITIAL;
builder.append(value.substring(start, i));
}
continue;
}
default:
throw new IllegalStateException("Unexpected char seen: " + ch);
}
}
switch (state) {
case GOT_DOLLAR: {
builder.append('$');
break;
}
case DEFAULT: {
builder.append(value.substring(start - 2));
break;
}
case GOT_OPEN_BRACE: {
// We had a reference that was not resolved, throw ISE
if (resolvedValue == null)
throw new IllegalStateException("Incomplete expression: " + builder.toString());
break;
}
}
return builder.toString();
}
}
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