ShellFactory.java

/*******************************************************************************
 * Copyright (c) 2012-2015 Codenvy, S.A.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.api.core.util;

/** @author andrew00x */
public class ShellFactory {

    public static Shell getShell() {
        if (SystemInfo.isUnix()) {
            return new StandardLinuxShell();
        }
        if (SystemInfo.isWindows()) {
            return new StandardWindowsShell();
        }
        throw new IllegalStateException("Unsupported OS");
    }

    /** Creates command line to run system command from set of arguments. */
    public static interface Shell {
        String[] createShellCommand(CommandLine args);
    }

    /** Creates command line for standard command language interpreter. */
    public static class StandardLinuxShell implements Shell {

        @Override
        public String[] createShellCommand(CommandLine args) {
            final String[] array = args.asArray();
            if (array.length == 0) {
                throw new IllegalArgumentException("Command line is empty");
            }
            StringBuilder buff = new StringBuilder();
            for (String str : array) {
                if (!str.isEmpty()) {
                    if (buff.length() > 0) {
                        buff.append(' ');
                    }
                    for (int i = 0, len = str.length(); i < len; i++) {
                        char c = str.charAt(i);
                        switch (c) {
                            case ' ':
                            case '|':
                            case '>':
                            case '$':
                            case '"':
                            case '\'':
                            case '&':
                            case '(':
                            case ')':
                            case '~':
                            case '@':
                            case '#':
                            case '%':
                            case '!':
                            case '^':
                            case '*':
                                buff.append('\\');
                                buff.append(c);
                                break;
                            case '\n':
                                buff.append('\\');
                                buff.append('n');
                                break;
                            case '\r':
                                buff.append('\\');
                                buff.append('r');
                                break;
                            case '\t':
                                buff.append('\\');
                                buff.append('t');
                                break;
                            case '\b':
                                buff.append('\\');
                                buff.append('b');
                                break;
                            case '\f':
                                buff.append('\\');
                                buff.append('f');
                                break;
                            default:
                                buff.append(c);
                                break;
                        }
                    }
                }
            }

            final String[] line = new String[3];
            line[0] = "/bin/bash";
            line[1] = "-cl";
            line[2] = buff.toString();
            return line;
        }
    }

    public static class StandardWindowsShell implements Shell {

        @Override
        public String[] createShellCommand(CommandLine args) {
            final String[] array = args.asArray();
            if (array.length == 0) {
                throw new IllegalArgumentException("Command line is empty");
            }
            StringBuilder buff = new StringBuilder();
            for (String str : array) {
                if (!str.isEmpty()) {
                    if (buff.length() > 0) {
                        buff.append(' ');
                    }
                    for (int i = 0, len = str.length(); i < len; i++) {
                        char c = str.charAt(i);
                        switch (c) {
                            case '|':
                            case '\'':
                            case '`':
                            case '&':
                            case ',':
                            case ';':
                            case '(':
                            case ')':
                            case '^':
                            case '*':
                                buff.append('^');
                                buff.append(c);
                                break;
                            default:
                                buff.append(c);
                                break;
                        }
                    }
                }
            }

            final String[] line = new String[3];
            line[0] = "cmd.exe";
            line[1] = "/c";
            line[2] = buff.toString();
            return line;
        }
    }

    private ShellFactory() {
    }
}