com.github.fritaly.dualcommander.FileComparator.java Source code

Introduction

Here is the source code for com.github.fritaly.dualcommander.FileComparator.java

Source

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses 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 com.github.fritaly.dualcommander;

import java.io.File;
import java.util.Comparator;

import org.apache.commons.lang.Validate;

public final class FileComparator implements Comparator<File> {

    private final HasParentDirectory delegate;

    public FileComparator(HasParentDirectory delegate) {
        Validate.notNull(delegate, "The given delegate is null");

        this.delegate = delegate;
    }

    @Override
    public int compare(File f1, File f2) {
        // Directories come first
        if (f1.isDirectory()) {
            if (f1.equals(this.delegate.getParentDirectory())) {
                // The parent directory always comes first
                return -1;
            }
            if (f2.isDirectory()) {
                if (f2.equals(this.delegate.getParentDirectory())) {
                    // The parent directory always comes first
                    return +1;
                }

                // Compare the 2 directories by (case-insensive) name
                return f1.getName().compareToIgnoreCase(f2.getName());
            } else {
                // The directories come first
                return -1;
            }
        } else {
            if (f2.isDirectory()) {
                // The directories come first
                return +1;
            } else {
                // Compare the 2 files by (case-insensive) name
                return f1.getName().compareToIgnoreCase(f2.getName());
            }
        }
    }
}