LinkedRegularFileFilter.java

/*
 * Copyright 2014 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed 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.guvnor.common.services.backend.file;

import org.uberfire.commons.validation.PortablePreconditions;
import org.uberfire.java.nio.file.Files;
import org.uberfire.java.nio.file.Path;

/**
 * A Filter that only accepts "Regular files"
 */
public class LinkedRegularFileFilter implements LinkedFilter {

    private LinkedFilter next = null;

    public LinkedRegularFileFilter() {
    }

    /**
     * Constructor that automatically chains the next filter
     * @param filter
     */
    public LinkedRegularFileFilter( final LinkedFilter filter ) {
        setNextFilter( PortablePreconditions.checkNotNull( "filter",
                                                           filter ) );
    }

    @Override
    public boolean accept( final Path path ) {
        if ( !Files.isRegularFile( path ) ) {
            return false;
        }
        if ( next != null ) {
            return next.accept( path );
        }
        return true;
    }

    @Override
    public void setNextFilter( final LinkedFilter filter ) {
        this.next = filter;
    }

}