/*
 * Copyright 2009-2013 Roland Huss
 *
 * 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.jolokia.converter.json.simplifier;

import java.io.File;
import java.io.IOException;

/**
 * Special deserialization for Files to shorten the info
 *
 * @author roland
 * @since Jul 27, 2009
 */
public class FileSimplifier extends SimplifierAccessor<File> {

    /**
     * Default constructor
     */
    public FileSimplifier() {
        super(File.class);

        addExtractor("name", new NameAttributeExtractor());
        addExtractor("length", new LengthAttributeExtractor());
        addExtractor("directory", new IsDirectoryAttributeExtractor());
        addExtractor("canonicalPath", new PathAttributeExtractor());
        addExtractor("exists", new ExistsAttributeExtractor());
        addExtractor("lastModified", new LastModifiedAttributeExtractor());
    }

    @Override
    public String extractString(Object pValue) {
        try {
            return ((File) pValue).getCanonicalPath();
        } catch (IOException e) {
            return ((File) pValue).getAbsolutePath();
        }
    }

    private static class NameAttributeExtractor implements AttributeExtractor<File> {
        @Override
        public Object extract(File file) {
            return file.getName();
        }
    }

    private static class LengthAttributeExtractor implements AttributeExtractor<File> {
        @Override
        public Object extract(File file) {
            return file.length();
        }
    }

    private static class IsDirectoryAttributeExtractor implements AttributeExtractor<File> {
        @Override
        public Object extract(File file) {
            return file.isDirectory();
        }
    }

    private static class PathAttributeExtractor implements AttributeExtractor<File> {
        @Override
        public Object extract(File file) {
            try {
                return file.getCanonicalPath();
            } catch (IOException e) {
                return null;
            }
        }
    }

    private static class ExistsAttributeExtractor implements AttributeExtractor<File> {
        @Override
        public Object extract(File file) {
            return file.exists();
        }
    }

    private static class LastModifiedAttributeExtractor implements AttributeExtractor<File> {
        @Override
        public Object extract(File value) {
            return value.lastModified();
        }
    }

}
