PropertiesWriterCLI

// 2012-11-29 johnpfeiffer
// TODO better handling/validation of arguments

package net.kittyandbear;

import java.io.IOException;
import java.io.PrintStream;

public class PropertiesWriterCLI {
    protected static final int MINIMUMPARAMETERS = 1;
    protected static final int MAXIMUMPARAMETERS = 3;
    public static final String CORRECTUSAGE = "Read the file, use a key to get a value, or use a key to replace a value... usage: "
            + "\nVIEW VALUES SORTED: java -jar PropertiesWriterGetValueCLI-" + PropertiesWriter.CLASSVERSION
            + " pathAndFilename.properties [KEY] [NEWVALUE]";

    static public void main( String args[] ) {
        if (argsAreInvalid( args )) {
            System.out.println( "ERROR: " + args.length + " Incorrect number of parameters, " + CORRECTUSAGE );
            System.exit( 1 );
        }
        if (args.length == 1) {
            displayKeyValueMapping( args[0], System.out );
        }
        else if (args.length == 2) {
            displayKeyValue( args[0], args[1] , System.out );
        }
        else if (args.length == 3) {
            replaceKeyValue( args[0], args[1], args[2] );
        }
        else {
            System.out.println( "ERROR: Incorrect number of parameters, " + CORRECTUSAGE );
            System.exit( 1 );
        }
    }

    private static boolean argsAreInvalid( String args[] ) {
        boolean areInvalid = true;
        if (args != null && args.length >= MINIMUMPARAMETERS & args.length <= MAXIMUMPARAMETERS) {
            areInvalid = false;
        }
        return ( areInvalid );
    }

    private static void displayKeyValueMapping( String pathAndFilename, PrintStream out ) {
        try {
            PropertiesReader properties = new PropertiesReader( pathAndFilename );
            out.println( properties.getKeysAndValuesSortedByKeysString() );
        }
        catch( IOException e ) {
            out.println( "ERROR: IOException " + e.getMessage() );
        }
    }

    private static void displayKeyValue( String pathAndFilename, String key, PrintStream out ) {
        try {
            PropertiesReader properties = new PropertiesReader( pathAndFilename );
            String value = properties.getPropertyValue( key );
            if (value == null) {
                out.println( "ERROR: key " + key + " not found in " + pathAndFilename );
            }
            else {
                out.println( properties.getPropertyValue( key ) );
            }
        }
        catch( IllegalArgumentException e ) {
            System.out.println( "ERROR: IllegalArgumentException " + e.getMessage() );
        }
        catch( IOException e ) {
            System.out.println( "ERROR: IOException " + e.getMessage() );
        }
    }

    private static void replaceKeyValue( String pathAndFilename, String key, String newValue ) {
        try {
            PropertiesReader read = new PropertiesReader( pathAndFilename );
            String value = read.getPropertyValue( key );
            if( value != null )
            {
                System.out.println( "DEBUG: for entry: " + key + " ,  " + value + " with " + newValue );
            }

            PropertiesWriter properties = new PropertiesWriter( pathAndFilename );
            properties.setPropertyValue( key, newValue );
            properties.writeSorted( pathAndFilename );

        }
        catch( IllegalArgumentException e ) {
            System.out.println( "ERROR: IllegalArgumentException " + e.getMessage() );
        }
        catch( IOException e ) {
            System.out.println( "ERROR: IOException " + e.getMessage() );
        }
    }

} // end class