com.sangupta.andruil.commands.base.AbstractHashCommand.java Source code

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Here is the source code for com.sangupta.andruil.commands.base.AbstractHashCommand.java

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/**
 *
 * andruil - Java command line shell
 * Copyright (c) 2012-2015, Sandeep Gupta
 * 
 * http://www.sangupta/projects/andruil
 * 
 * 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.sangupta.andruil.commands.base;

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

import org.apache.commons.io.FileUtils;

/**
 * @author sangupta
 *
 */
public abstract class AbstractHashCommand extends AbstractMultiFileCommand {

    /**
     * Return the name of the algorithm implementation to be used
     * for hashing.
     * 
     * @return
     */
    protected abstract String getAlgorithmName();

    /**
     * @see com.sangupta.andruil.commands.base.AbstractMultiFileCommand#processFile(java.io.File)
     */
    @Override
    protected boolean processFile(File file) throws IOException {
        if (file.isDirectory()) {
            return true;
        }

        byte[] bytes = FileUtils.readFileToByteArray(file);
        try {
            java.security.MessageDigest md = java.security.MessageDigest.getInstance(getAlgorithmName());
            byte[] array = md.digest(bytes);
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < array.length; ++i) {
                sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1, 3));
            }

            System.out.println(sb.toString() + " *" + file.getName());
        } catch (java.security.NoSuchAlgorithmException e) {
            // do nothing
            System.out.println("No " + getAlgorithmName() + " implementation available");
            return false;
        }

        return true;
    }

}