com.github.neio.filesystem.paths.AbstractPath.java Source code

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Here is the source code for com.github.neio.filesystem.paths.AbstractPath.java

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/*
 * 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.neio.filesystem.paths;

import java.io.File;

import org.apache.commons.lang.ClassUtils;

import com.github.neio.filesystem.Path;
import com.github.neio.filesystem.exception.PathException;

/**
 * @author developer.sid@gmail.com
 *
 */
abstract class AbstractPath<P extends Path> implements Path {
    private static final long serialVersionUID = -5023729396774232536L;
    protected String path;
    private Class<P> clazz;

    private String stringifyResult = null;
    private Integer hashMeResult = null;

    protected abstract String stringify();

    protected abstract int hashMe();

    protected abstract int howDoICompare(P path);

    protected abstract boolean amIEqual(P path);

    AbstractPath(String path, Class<P> clazz) throws PathException {
        this.path = path;
        this.clazz = clazz;
    }

    @Override
    public String getPath() {
        return path;
    }

    @Override
    public boolean exists() {
        return new File(path).exists();
    }

    @SuppressWarnings("unchecked")
    @Override
    public int compareTo(Path o) {
        if (o != null) {
            if (ClassUtils.isAssignable(o.getClass(), clazz)) {
                return howDoICompare((P) o);
            } else {
                throw new ClassCastException(o.getClass() + " was not comparable with " + clazz.getName());
            }
        } else {
            throw new NullPointerException("Path being compared was null");
        }
    }

    @SuppressWarnings("unchecked")
    @Override
    public boolean equals(Object obj) {
        if (obj != null) {
            if (ClassUtils.isAssignable(obj.getClass(), clazz) == true) {
                return amIEqual((P) obj);
            } else {
                return false;
            }
        } else {
            return false;
        }
    }

    @Override
    public int hashCode() {
        if (hashMeResult == null) {
            hashMeResult = Integer.valueOf(hashMe());
        }

        return hashMeResult.intValue();
    }

    public String toString() {
        if (stringifyResult == null) {
            stringifyResult = stringify();
        }

        return stringifyResult;
    }
}