com.sangupta.andruil.utils.ArgumentUtils.java Source code

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Here is the source code for com.sangupta.andruil.utils.ArgumentUtils.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.utils;

import java.io.File;
import java.io.FileFilter;

import org.apache.commons.io.IOCase;
import org.apache.commons.io.filefilter.WildcardFileFilter;

/**
 * Utility function around validation, conversion and decomposition
 * of command arguments.
 * 
 * @author sangupta
 *
 */
public class ArgumentUtils {

    /**
     * Check if the given argument represents a number or not.
     * 
     * @param arg
     * @return
     */
    public static boolean isNumber(String arg) {
        if (arg == null) {
            return false;
        }

        char[] num = arg.toCharArray();
        int index = 0;
        char c;
        for (; index < num.length; index++) {
            c = num[index];
            if (c < '0' || c > '9' || c != '-' || c != '+' || c != '.') {
                return false;
            }
        }

        return true;
    }

    /**
     * Check if a given argument has wild-cards present in it or not.
     * 
     * @param arg
     * @return
     */
    public static boolean hasWildcards(String arg) {
        if (arg == null) {
            return false;
        }

        char[] name = arg.toCharArray();
        int index = 0;
        char c;
        for (; index < name.length; index++) {
            c = name[index];
            if (c == '*' || c == '?') {
                return true;
            }
        }

        return false;
    }

    /**
     * Resolve the supplied file argument which may contain wildcards
     * to a list of all valid files.
     * 
     * @param arg
     * @return
     */
    public static File[] resolveFiles(final File currentDir, String arg) {
        if (arg == null) {
            return null;
        }

        if (!hasWildcards(arg)) {
            File file = new File(currentDir, arg);
            return new File[] { file };
        }

        // the argument does have wild cards
        // resolve it
        FileFilter wildcardFileFilter = new WildcardFileFilter(arg, IOCase.SYSTEM);
        File[] files = currentDir.listFiles(wildcardFileFilter);
        return files;
    }
}