jlibs.core.io.FileNavigator Maven / Gradle / Ivy
/**
* Copyright 2015 Santhosh Kumar Tekuri
*
* The JLibs authors license this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package jlibs.core.io;
import jlibs.core.graph.Convertor;
import jlibs.core.graph.Navigator2;
import jlibs.core.graph.Sequence;
import jlibs.core.graph.sequences.ArraySequence;
import jlibs.core.graph.sequences.EmptySequence;
import java.io.File;
import java.io.FileFilter;
/**
* @author Santhosh Kumar T
*/
public class FileNavigator extends Navigator2 implements Convertor{
public static final FileNavigator INSTANCE = new FileNavigator(null);
private FileFilter filter;
public FileNavigator(FileFilter filter){
this.filter = filter;
}
@Override
public File parent(File elem){
return elem.getParentFile();
}
@Override
public Sequence children(File elem){
if(elem.isDirectory())
return new ArraySequence(filter!=null ? elem.listFiles(filter) : elem.listFiles());
else
return EmptySequence.getInstance();
}
@Override
public String convert(File source){
return source.getName();
}
public String getRelativePath(File fromFile, File toFile){
return getRelativePath(fromFile.getAbsoluteFile(), toFile.getAbsoluteFile(), this, FileUtil.SEPARATOR, false);
}
}