/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project 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
* General Public License or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.nutsnbolts.util;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
public class PropertyExpander {
private SystemPropertyMode systemPropertyMode;
private String prefix;
private String suffix;
private boolean ignoreUnresolvableProperties;
private boolean searchSystemEnvironment;
public PropertyExpander ()
throws PropertyExpanderException {
this("${", "}", false, SystemPropertyMode.FALLBACK, true);
}
public PropertyExpander (boolean ignoreUnresolvableProperties)
throws PropertyExpanderException {
this("${", "}", ignoreUnresolvableProperties, SystemPropertyMode.FALLBACK, true);
}
public PropertyExpander (SystemPropertyMode systemPropertyMode, boolean searchSystemEnvironment)
throws PropertyExpanderException {
this("${", "}", false, systemPropertyMode, searchSystemEnvironment);
}
public PropertyExpander (boolean ignoreUnresolvableProperties, SystemPropertyMode systemPropertyMode, boolean searchSystemEnvironment)
throws PropertyExpanderException {
this("${", "}", ignoreUnresolvableProperties, systemPropertyMode, searchSystemEnvironment);
}
public PropertyExpander (String prefix, String suffix, boolean ignoreUnresolvableProperties, SystemPropertyMode systemPropertyMode, boolean searchSystemEnvironment)
throws PropertyExpanderException {
this.prefix = prefix;
this.suffix = suffix;
this.ignoreUnresolvableProperties = ignoreUnresolvableProperties;
this.systemPropertyMode = systemPropertyMode;
this.searchSystemEnvironment = searchSystemEnvironment;
for (int pos = 0; pos < prefix.length(); pos++) {
if (suffix.indexOf(prefix.charAt(pos)) >= 0) {
throw new PropertyExpanderException("The prefix(%s) and suffix(%s) should have no characters in common", prefix, suffix);
}
}
}
public String expand (String expansion)
throws PropertyExpanderException {
return expand(expansion, new StringBuilder(expansion), Collections.<String, Object>emptyMap()).toString();
}
public String expand (String expansion, Map<String, Object> expansionMap)
throws PropertyExpanderException {
return expand(expansion, new StringBuilder(expansion), expansionMap).toString();
}
private StringBuilder expand (String originalExpansion, StringBuilder expansionBuilder, Map<String, Object> expansionMap)
throws PropertyExpanderException {
HashSet<String> encounteredKeySet;
String expansionKey;
Object expansionValue;
int arabesqueCount = 0;
int parsePos = 0;
int prefixPos;
int nextPrefixPos;
int suffixPos;
int markerPos = -1;
encounteredKeySet = new HashSet<>();
while ((prefixPos = expansionBuilder.indexOf(prefix, parsePos)) >= 0) {
arabesqueCount++;
parsePos = prefixPos + prefix.length();
do {
if ((suffixPos = expansionBuilder.indexOf(suffix, parsePos)) < 0) {
throw new PropertyExpanderException("Unclosed property prefix within the expansion sub-template(%s)", expansionBuilder.toString());
}
if (((nextPrefixPos = expansionBuilder.indexOf(prefix, parsePos)) >= 0) && (nextPrefixPos < suffixPos)) {
arabesqueCount++;
parsePos = nextPrefixPos + prefix.length();
}
else {
arabesqueCount--;
parsePos = suffixPos + suffix.length();
}
} while (arabesqueCount > 0);
if (parsePos >= markerPos) {
encounteredKeySet.clear();
}
markerPos = parsePos;
expansionKey = expand(originalExpansion, new StringBuilder(expansionBuilder.substring(prefixPos + prefix.length(), suffixPos)), expansionMap).toString();
if ((!systemPropertyMode.equals(SystemPropertyMode.OVERRIDE)) || ((expansionValue = System.getProperty(expansionKey)) == null)) {
if ((!(systemPropertyMode.equals(SystemPropertyMode.OVERRIDE) && searchSystemEnvironment)) || ((expansionValue = System.getenv(expansionKey)) == null)) {
if ((expansionValue = expansionMap.get(expansionKey)) == null) {
if ((!systemPropertyMode.equals(SystemPropertyMode.FALLBACK)) || ((expansionValue = System.getProperty(expansionKey)) == null)) {
if ((!(systemPropertyMode.equals(SystemPropertyMode.FALLBACK) && searchSystemEnvironment)) || ((expansionValue = System.getenv(expansionKey)) == null)) {
if (!ignoreUnresolvableProperties) {
String subExpansion;
if (originalExpansion.equals(subExpansion = expansionBuilder.substring(prefixPos, suffixPos + suffix.length()))) {
if (originalExpansion.equals(prefix + expansionKey + suffix)) {
throw new PropertyExpanderException("Could find no mapping for property(%s)", originalExpansion);
}
else {
throw new PropertyExpanderException("Could find no mapping for property(%s%s%s) within the expansion (%s)", prefix, expansionKey, suffix, originalExpansion);
}
}
else if (subExpansion.equals(prefix + expansionKey + suffix)) {
throw new PropertyExpanderException("Could find no mapping for property(%s) within the expansion (%s)", subExpansion, originalExpansion);
}
else {
throw new PropertyExpanderException("Could find no mapping for property(%s%s%s) within the expansion sub-template(%s) of (%s)", prefix, expansionKey, suffix, subExpansion, originalExpansion);
}
}
else {
expansionBuilder.replace(prefixPos + prefix.length(), suffixPos, expansionKey);
parsePos += expansionKey.length() - (suffixPos - (prefixPos + prefix.length()));
}
}
}
}
}
}
if (expansionValue != null) {
String expansionValueAsString = expansionValue.toString();
if (encounteredKeySet.contains(expansionKey)) {
throw new PropertyExpanderException("Circular reference to property(%s%s%s) within the expansion sub-template(%s)", prefix, expansionKey, suffix, expansionBuilder.toString());
}
encounteredKeySet.add(expansionKey);
expansionBuilder.replace(prefixPos, suffixPos + suffix.length(), expansionValueAsString);
parsePos = prefixPos;
markerPos += expansionValueAsString.length() - (suffixPos + suffix.length() - prefixPos);
}
}
return expansionBuilder;
}
}