/**
* "Разрешает" ссылку. <br>
* Примеры: <br>
*
* <table>
* <tr>
* <td>current dir</td>
* <td>this</td>
* <td>link</td>
* <td>result</td>
* </tr>
*
* <tr>
* <td>/opt/jdk/default</td>
* <td>/opt/jdk/default</td>
* <td>jdk1.8.0_05</td>
* <td>/opt/jdk/jdk1.8.0_05</td>
* </tr>
*
* <tr>
* <td>/opt/jdk/default</td>
* <td>/opt/jdk/default</td>
* <td>./jdk1.8.0_05</td>
* <td>/opt/jdk/jdk1.8.0_05</td>
* </tr>
*
* <tr>
* <td>/opt/jdk/default</td>
* <td>/opt/jdk/default</td>
* <td>../jdk1.8.0_05</td>
* <td>/opt/jdk1.8.0_05</td>
* </tr>
*
* <tr>
* <td>/opt/jdk/default</td>
* <td>/opt/jdk/default</td>
* <td>../../jdk1.8.0_05</td>
* <td>/jdk1.8.0_05</td>
* </tr>
*
* <tr>
* <td>/opt/jdk/default</td>
* <td>/opt/jdk/default</td>
* <td>../../../../jdk1.8.0_05</td>
* <td>/jdk1.8.0_05</td>
* </tr>
*
* </table>
*
* @param link куда указывает ссылка
* @param currentDir текущий каталог
* @return цель
*/
public UnixPath resolveLink(UnixPath link, UnixPath currentDir) {
if (currentDir == null) throw new IllegalArgumentException("currentDir==null");
if (link == null) throw new IllegalArgumentException("path==null");
if (link.isAbsolute()) return link;
UnixPath p = !isAbsolute() ? getAbsolute(currentDir) : this;
ArrayList<String> cmpts = new ArrayList<String>();
cmpts.addAll(Arrays.asList(p.getComponents()));
if (cmpts.size() > 0) cmpts.remove(cmpts.size() - 1);
for (String cmpt : link.getComponents()) {
if (cmpt.equals(current)) continue;
if (cmpt.equals(empty)) continue;
if (cmpt.equals(parent)) {
if (cmpts.size() > 1) {
cmpts.remove(cmpts.size() - 1);
continue;
} else {
if (resolveLink_allowRetNull()) {
return null;
} else {
continue;
}
}
}
cmpts.add(cmpt);
}
return new UnixPath(cmpts.toArray(new String[] {}));
}
/**
* Возвращает абсолютный путь относительно текущего каталога
*
* @param currentDir текущий каталог
* @return абсолютный путь
*/
public UnixPath getAbsolute(UnixPath currentDir) {
if (this.isAbsolute()) return this;
if (currentDir == null) throw new IllegalArgumentException("currentDir==null");
if (!currentDir.isAbsolute()) throw new IllegalArgumentException("!currentDir.isAbsolute()");
// ArrayList<String> cmpts = new ArrayList<String>();
// cmpts.addAll(Arrays.asList(currentDir.getComponents()));
// for( String cmpt : components ){
// if( cmpt.equals(empty) )continue;
// if( cmpt.equals(current) )continue;
// if( cmpt.equals(parent) ){
// if( cmpts.size()>1 ){
// cmpts.remove(cmpts.size()-1);
// continue;
// }else{
// if( getAbsolute_allowRetNull() ){
// return null;
// }else{
// continue;
// }
// }
// }
// cmpts.add(cmpt);
// }
// return new UnixPath(cmpts.toArray(new String[]{}));
ArrayList<String> cmpts = new ArrayList<String>();
for (String c : currentDir.getComponents()) {
cmpts.add(c);
}
for (String c : this.getComponents()) {
cmpts.add(c);
}
return new UnixPath(cmpts.toArray(new String[] {}));
}