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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2008-2013 jOpenDocument, by ILM Informatique. All rights reserved.
*
* The contents of this file are subject to the terms of the GNU
* General Public License Version 3 only ("GPL").
* You may not use this file except in compliance with the License.
* You can obtain a copy of the License at http://www.gnu.org/licenses/gpl-3.0.html
* See the License for the specific language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each file.
*
*/
package org.jopendocument.util;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.regex.Pattern;
public class SystemUtils {
/**
* Wrap a system property and view it as a list.
*
* @author Sylvain CUAZ
*/
public static final class PropertyList {
private final String name;
private final Pattern p;
/**
* Create a new instance.
*
* @param name name of the property, e.g. "java.protocol.handler.pkgs".
* @param sep the separator used, e.g. "|".
*/
public PropertyList(final String name, final String sep) {
this.name = name;
this.p = Pattern.compile(sep, Pattern.LITERAL);
}
public final String getName() {
return this.name;
}
private final String getSeparator() {
return this.p.pattern();
}
public final String getValue() {
return System.getProperty(this.name);
}
public final List getValues() {
return getList(getValue());
}
private final List getList(final String current) {
if (current == null)
return null;
else if (current.length() == 0)
return Collections.emptyList();
else {
return Arrays.asList(this.p.split(current));
}
}
/**
* Adds a value to the system property list if not already present.
*
* @param value the value to add, e.g. "sun.net.www.protocol".
* @return true
if the property was modified.
*/
public final boolean add(final String value) {
return this.add(value, true);
}
public final boolean add(final String value, boolean append) {
if (value == null)
throw new NullPointerException("Null value");
final String current = getValue();
final List l = getList(current);
final String newVal;
if (l == null || l.size() == 0)
newVal = value;
else if (l.contains(value))
newVal = null;
else if (append)
newVal = current + this.getSeparator() + value;
else
newVal = value + this.getSeparator() + current;
if (newVal != null) {
System.setProperty(this.name, newVal);
return true;
} else
return false;
}
}
}