FallbackFileLocator.java

/**
 * Copyright (C) 2008 Mathieu Carbou <mathieu.carbou@gmail.com>
 * 
 * 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 com.mycila.testing.plugins.jetty.locator;

import static com.google.common.base.Predicates.not;

import java.io.File;
import java.io.FileNotFoundException;

import com.google.common.collect.Iterables;

class FallbackFileLocator
        implements FileLocator {
    
    public FallbackFileLocator(
            final FileLocator locator,
            final FileLocator fallbackLocator)
    {
        this.locator = locator;
        this.fallbackLocator = fallbackLocator;
    }
    

    public Iterable<File> locate(
            final String path)
        throws FileNotFoundException
    {
        Iterable<File> files = this.locator.locate(path);
        
        final boolean useFallback = Iterables.any(files, not(new ExistsFilePredicate()));
        if (useFallback) {
            files = this.fallbackLocator.locate(path);
        }
        
        return files;
    }
    

    private final FileLocator locator;
    
    private final FileLocator fallbackLocator;
    
}