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/*
* ====================
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2008-2009 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of the Common Development
* and Distribution License("CDDL") (the "License"). You may not use this file
* except in compliance with the License.
*
* You can obtain a copy of the License at
* http://IdentityConnectors.dev.java.net/legal/license.txt
* See the License for the specific language governing permissions and limitations
* under the License.
*
* When distributing the Covered Code, include this CDDL Header Notice in each file
* and include the License file at identityconnectors/legal/license.txt.
* If applicable, add the following below this CDDL Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyrighted [year] [name of copyright owner]"
* ====================
*/
package org.identityconnectors.dbcommon;
import java.util.*;
/**
* Resolver of properties in UNIX/ant style.
*
* Example of usage :
*
*
* Properties p = new Properties();
* p.setProperty("p1","value1");
* p.setProperty("p2","Value of p1 is ${p1}");
* p = PropertiesResolver.resolveProperties(p);
*
*
* It is shield against recursion.
*
* @author kitko
*
*/
public class PropertiesResolver {
private PropertiesResolver(){
//empty
}
/** Resolves properties
* @param properties properties we want to resolve
* @param resolvedProperties already known properties
* @return resolved properties
*/
public static Properties resolveProperties(Properties properties,Properties resolvedProperties) {
if (properties == null) {
return null;
}
return resolveProperties(copyProperties(properties),copyProperties(resolvedProperties),new HashSet(5));
}
/**
* Resolve properties containing already known values
* @param properties
* @return resolved properties
*/
public static Properties resolveProperties(Properties properties){
if (properties == null) {
return null;
}
Properties copy = copyProperties(properties);
return resolveProperties(copy,new Properties(),new HashSet(5));
}
private static Properties resolveProperties(Properties properties,Properties resolvedProperties,Set justResolving) {
for(Map.Entry entry : properties.entrySet()){
String value = (String) entry.getValue();
if(value.contains("$")){
value = resolveName((String) entry.getKey(),properties,resolvedProperties,justResolving);
entry.setValue(value);
}
}
return properties;
}
private static String resolveName(String name,Properties properties,Properties resolvedProperties,Set justResolving) {
String value = null;
if(!justResolving.isEmpty()){
value = resolvedProperties.getProperty(name);
}
if (value != null) {
return value;
}
if (justResolving.contains(name)) {
value = "RECURSION";
return value;
}
value = properties.getProperty(name);
if (value == null) {
value = "NOT_RESOLVED";
return value;
}
else {
justResolving.add(name);
value = resolveValue(value,properties,resolvedProperties,justResolving);
justResolving.remove(name);
resolvedProperties.setProperty(name, value);
return value;
}
}
private static String resolveValue(String value,Properties properties,Properties resolvedProperties,Set justResolving) {
if (value == null) {
return null;
}
int index = 0;
int length = value.length();
StringBuffer result = new StringBuffer();
while (index >= 0 && index < length) {
int varStart = value.indexOf("${", index);
if (varStart >= 0) {
int varEnd = value.indexOf('}', varStart);
if (varEnd >= 0) {
String varSubstring = value.substring(varStart, varEnd + 1);
String varName = varSubstring.substring(2, varSubstring.length() - 1);
String varValue = resolveName(varName,properties,resolvedProperties,justResolving);
if ("NOT_RESOLVED".equals(varValue)){
varValue = varSubstring;
}
else if("RECUSRION".equals(varValue)){
varValue = "${RECURSION!!!_" + varName + "}";
}
result.append(value.substring(index, varStart));
result.append(varValue);
index = varEnd + 1;
}
else {
result.append(value.substring(index, value.length()));
index = value.length();
}
}
else {
result.append(value.substring(index, value.length()));
index = value.length();
}
}
return result.toString();
}
private static Properties copyProperties(Properties properties){
Properties result = new Properties();
if(properties == null){
return result;
}
for(Map.Entry entry : properties.entrySet()){
result.put(entry.getKey(), entry.getValue());
}
return result;
}
}
