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HSQLDB example source code file (CodeSwitcher.java)

This example HSQLDB source code file (CodeSwitcher.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - HSQLDB tags/keywords

bufferedreader, codeswitcher, codeswitcher, exception, file, file, filereader, io, ioexception, mode, string, string, use, util, vector, vector

The HSQLDB CodeSwitcher.java source code

/*
 * For work developed by the HSQL Development Group:
 *
 * Copyright (c) 2001-2010, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 *
 * For work originally developed by the Hypersonic SQL Group:
 *
 * Copyright (c) 1995-2000, The Hypersonic SQL Group.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the Hypersonic SQL Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the Hypersonic SQL Group.
 */


package org.hsqldb.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.LineNumberReader;
import java.util.Vector;

// fredt@users 20020315 - patch 1.7.0 - minor fixes
// changed line separator to System based value
// moved the Profile class to org.hsqldb.test package
// fredt@users 20021020 - patch 1.7.1 - formatting fix
// avoid moving blank lines which would be interpreted as code change by CVS
// fredt@users 20021118 - patch 1.7.2 - no-change, no-save fix
// if the file contents do not change, do not save a new version of file
// fredt@users 20040322 - removed unused profiling code
// fredt@users 20080315 - added ifndef switch

/**
 * Modifies the source code to support different JDK or profile settings. <p>
 * <pre>
 * Usage: java CodeSwitcher paths|{--pathlist=listfile} [{+|-}label...] [+][-]
 * If no labels are specified then all used
 * labels in the source code are shown.
 * Use +MODE to switch on the things labeld MODE
 * Use -MODE to switch off the things labeld MODE
 * Path: Any number of path or files may be
 * specified. Use . for the current directory
 * (including sub-directories).
 * Example: java CodeSwitcher +JAVA2 .
 * This example switches on code labeled JAVA2
 * in all *.java files in the current directory
 * and all subdirectories.
 * java CodeSwitcher + .
 * Adds test code to the code.
 * java CodeSwitcher - .
 * Removes test code from the code
 * </pre>
 *
 * @author Thomas Mueller (Hypersonic SQL Group)
 * @version 1.7.0
 * @since Hypersonic SQL
 */
public class CodeSwitcher {

    private static final String ls = System.getProperty("line.separator",
        "\n");
    private Vector           vList;
    private Vector           vSwitchOn;
    private Vector           vSwitchOff;
    private Vector           vSwitches;
    private static final int MAX_LINELENGTH = 82;

    /**
     * Method declaration
     *
     *
     * @param a
     */
    public static void main(String[] a) {

        CodeSwitcher s = new CodeSwitcher();

        if (a.length == 0) {
            showUsage();

            return;
        }

        File listFile = null;
        File baseDir  = null;

        for (int i = 0; i < a.length; i++) {
            String p = a[i];

            if (p.startsWith("+")) {
                s.vSwitchOn.addElement(p.substring(1));
            } else if (p.startsWith("--basedir=")) {
                baseDir = new File(p.substring("--basedir=".length()));
            } else if (p.startsWith("--pathlist=")) {
                listFile = new File(p.substring("--pathlist=".length()));
            } else if (p.startsWith("-")) {
                s.vSwitchOff.addElement(p.substring(1));
            } else {
                s.addDir(p);
            }
        }

        if (baseDir != null) {
            if (listFile == null) {
                System.err.println(
                    "--basedir= setting ignored, since only used for list files");
            } else {
                if (!baseDir.isDirectory()) {
                    System.err.println("Skipping listfile since basedir '"
                                       + baseDir.getAbsolutePath()
                                       + "' is not a directory");

                    listFile = null;
                }
            }
        }

        if (listFile != null) {
            try {
                BufferedReader br =
                    new BufferedReader(new FileReader(listFile));
                String st, p;
                int    hashIndex;
                File   f;

                while ((st = br.readLine()) != null) {
                    hashIndex = st.indexOf('#');
                    p         = ((hashIndex > -1) ? st.substring(0, hashIndex)
                                                  : st).trim();

                    if (p.length() < 1) {
                        continue;
                    }

                    f = (baseDir == null) ? (new File(p))
                                          : (new File(baseDir, p));

                    if (f.isFile()) {
                        s.addDir(f);
                    } else {
                        System.err.println("Skipping non-file '" + p.trim()
                                           + "'");
                    }
                }
            } catch (Exception e) {
                System.err.println("Failed to read pathlist file '"
                                   + listFile.getAbsolutePath() + "'");
            }
        }

        if (s.size() < 1) {
            printError("No path specified, or no specified paths qualify");
            showUsage();
        }

        s.process();

        if (s.vSwitchOff.size() == 0 && s.vSwitchOn.size() == 0) {
            s.printSwitches();
        }
    }

    public int size() {
        return (vList == null) ? 0
                               : vList.size();
    }

    /**
     * Method declaration
     *
     */
    static void showUsage() {

        System.out.print("Usage: java CodeSwitcher paths|{--pathlist=listfile} "
                         + "[{+|-}label...] [+][-]\n"
                         + "If no labels are specified then all used\n"
                         + "labels in the source code are shown.\n"
                         + "Use +MODE to switch on the things labeld MODE\n"
                         + "Use -MODE to switch off the things labeld MODE\n"
                         + "Path: Any number of path or files may be\n"
                         + "specified. Use . for the current directory\n"
                         + "(including sub-directories).\n"
                         + "Example: java CodeSwitcher +JAVA2 .\n"
                         + "This example switches on code labeled JAVA2\n"
                         + "in all *.java files in the current directory\n"
                         + "and all subdirectories.\n");
    }

    /**
     * Constructor declaration
     *
     */
    CodeSwitcher() {

        vList      = new Vector();
        vSwitchOn  = new Vector();
        vSwitchOff = new Vector();
        vSwitches  = new Vector();
    }

    /**
     * Method declaration
     *
     */
    void process() {

        int len = vList.size();

        for (int i = 0; i < len; i++) {
            System.out.print(".");

            String file = (String) vList.elementAt(i);

            if (!processFile(file)) {
                System.out.println("in file " + file + " !");
            }
        }

        System.out.println("");
    }

    /**
     * Method declaration
     *
     */
    void printSwitches() {

        System.out.println("Used labels:");

        for (int i = 0; i < vSwitches.size(); i++) {
            System.out.println((String) (vSwitches.elementAt(i)));
        }
    }

    /**
     * Wrapper
     *
     * @param path
     */
    void addDir(String path) {
        addDir(new File(path));
    }

    void addDir(File f) {

        if (f.isFile() && f.getName().endsWith(".java")) {
            vList.addElement(f.getPath());
        } else if (f.isDirectory()) {
            File[] list = f.listFiles();

            for (int i = 0; i < list.length; i++) {
                addDir(list[i]);
            }
        }
    }

    /**
     * Method declaration
     *
     *
     * @param name
     */
    boolean processFile(String name) {

        File    f         = new File(name);
        File    fnew      = new File(name + ".new");
        int     state     = 0;    // 0=normal 1=inside_if 2=inside_else
        boolean switchoff = false;
        boolean working   = false;

        try {
            Vector v  = getFileLines(f);
            Vector v1 = new Vector(v.size());

            for (int i = 0; i < v.size(); i++) {
                v1.addElement(v.elementAt(i));
            }

            for (int i = 0; i < v.size(); i++) {
                String line = (String) v.elementAt(i);

                if (line == null) {
                    break;
                }

                if (working) {
                    if (line.equals("/*") || line.equals("*/")) {
                        v.removeElementAt(i--);

                        continue;
                    }
                }

                if (line.startsWith("//#")) {
                    if (line.startsWith("//#ifdef ")) {
                        if (state != 0) {
                            printError("'#ifdef' not allowed inside '#ifdef'");

                            return false;
                        }

                        state = 1;

                        String s = line.substring(9);

                        if (vSwitchOn.indexOf(s) != -1) {
                            working   = true;
                            switchoff = false;
                        } else if (vSwitchOff.indexOf(s) != -1) {
                            working = true;

                            v.insertElementAt("/*", ++i);

                            switchoff = true;
                        }

                        if (vSwitches.indexOf(s) == -1) {
                            vSwitches.addElement(s);
                        }
                    } else if (line.startsWith("//#ifndef ")) {
                        if (state != 0) {
                            printError(
                                "'#ifndef' not allowed inside '#ifdef'");

                            return false;
                        }

                        state = 1;

                        String s = line.substring(10);

                        if (vSwitchOff.indexOf(s) != -1) {
                            working   = true;
                            switchoff = false;
                        } else if (vSwitchOn.indexOf(s) != -1) {
                            working = true;

                            v.insertElementAt("/*", ++i);

                            switchoff = true;
                        }

                        if (vSwitches.indexOf(s) == -1) {
                            vSwitches.addElement(s);
                        }
                    } else if (line.startsWith("//#else")) {
                        if (state != 1) {
                            printError("'#else' without '#ifdef'");

                            return false;
                        }

                        state = 2;

                        if (!working) {}
                        else if (switchoff) {
                            if (v.elementAt(i - 1).equals("")) {
                                v.insertElementAt("*/", i - 1);

                                i++;
                            } else {
                                v.insertElementAt("*/", i++);
                            }

                            switchoff = false;
                        } else {
                            v.insertElementAt("/*", ++i);

                            switchoff = true;
                        }
                    } else if (line.startsWith("//#endif")) {
                        if (state == 0) {
                            printError("'#endif' without '#ifdef'");

                            return false;
                        }

                        state = 0;

                        if (working && switchoff) {
                            if (v.elementAt(i - 1).equals("")) {
                                v.insertElementAt("*/", i - 1);

                                i++;
                            } else {
                                v.insertElementAt("*/", i++);
                            }
                        }

                        working = false;
                    } else {}
                }
            }

            if (state != 0) {
                printError("'#endif' missing");

                return false;
            }

            boolean filechanged = false;

            for (int i = 0; i < v.size(); i++) {
                if (!v1.elementAt(i).equals(v.elementAt(i))) {
                    filechanged = true;

                    break;
                }
            }

            if (!filechanged) {
                return true;
            }

            writeFileLines(v, fnew);

            File fbak = new File(name + ".bak");

            fbak.delete();
            f.renameTo(fbak);

            File fcopy = new File(name);

            fnew.renameTo(fcopy);
            fbak.delete();

            return true;
        } catch (Exception e) {
            printError(e.toString());

            return false;
        }
    }

    static Vector getFileLines(File f) throws IOException {

        LineNumberReader read = new LineNumberReader(new FileReader(f));
        Vector           v    = new Vector();

        for (;;) {
            String line = read.readLine();

            if (line == null) {
                break;
            }

            v.addElement(line);
        }

        read.close();

        return v;
    }

    static void writeFileLines(Vector v, File f) throws IOException {

        FileWriter write = new FileWriter(f);

        for (int i = 0; i < v.size(); i++) {
            write.write((String) v.elementAt(i));
            write.write(ls);
        }

        write.flush();
        write.close();
    }

    /**
     * Method declaration
     *
     *
     * @param error
     */
    static void printError(String error) {
        System.out.println("");
        System.out.println("ERROR: " + error);
    }
}

Other HSQLDB examples (source code examples)

Here is a short list of links related to this HSQLDB CodeSwitcher.java source code file:

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