/*
 * 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 org.apache.rat.walker;

import org.apache.rat.report.IReportable;

import java.io.File;
import java.io.FilenameFilter;
import java.util.regex.Pattern;

/**
 * Abstract walker.
 */
public abstract class Walker implements IReportable {

    protected final File file;
    protected final String name;

    protected final FilenameFilter filter;

    protected static FilenameFilter regexFilter(final Pattern pattern) {
        return new FilenameFilter() {
            public boolean accept(File dir, String name) {
                final boolean result;
                if (pattern == null) {
                    result = true;
                } else {
                    result = !pattern.matcher(name).matches();
                }
                return result;
            }
        };
    }

    protected boolean isRestricted(File file) {
        return file.getName().startsWith(".");
    }
 
    protected final boolean isNotIgnored(final File file) {
        boolean result = false;
        if (filter != null) {
            final String name = file.getName();
            final File dir = file.getParentFile();
            result = !filter.accept(dir, name);
        }
        return !result;
    }

    public Walker(File file, final FilenameFilter filter) {
        this(file.getPath(), file, filter);
    }

    protected Walker(final String name, final File file, final FilenameFilter filter) {
        this.name = name;
        this.file = file;
        this.filter = filter;
    }

}