Tomcat example source code file (SSIFsize.java)

This example Tomcat source code file (SSIFsize.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 - Tomcat tags/keywords

decimalformat, decimalformat, illegalargumentexception, io, ioexception, m, one_kilobyte, one_kilobyte, one_megabyte, one_megabyte, printwriter, ssifsize, string, string, stringbuffer, text

The Tomcat SSIFsize.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.catalina.ssi;


import java.io.IOException;
import java.io.PrintWriter;
import java.text.DecimalFormat;
/**
 * Implements the Server-side #fsize command
 * 
 * @author Bip Thelin
 * @author Paul Speed
 * @author Dan Sandberg
 * @author David Becker
 * @version $Revision: 531303 $, $Date: 2007-04-23 02:24:01 +0200 (lun., 23 avr. 2007) $
 */
public final class SSIFsize implements SSICommand {
    protected final static int ONE_KILOBYTE = 1024;
    protected final static int ONE_MEGABYTE = 1024 * 1024;


    /**
     * @see SSICommand
     */
    public long process(SSIMediator ssiMediator, String commandName,
            String[] paramNames, String[] paramValues, PrintWriter writer) {
        long lastModified = 0;
        String configErrMsg = ssiMediator.getConfigErrMsg();
        for (int i = 0; i < paramNames.length; i++) {
            String paramName = paramNames[i];
            String paramValue = paramValues[i];
            String substitutedValue = ssiMediator
                    .substituteVariables(paramValue);
            try {
                if (paramName.equalsIgnoreCase("file")
                        || paramName.equalsIgnoreCase("virtual")) {
                    boolean virtual = paramName.equalsIgnoreCase("virtual");
                    lastModified = ssiMediator.getFileLastModified(
                            substitutedValue, virtual);
                    long size = ssiMediator.getFileSize(substitutedValue,
                            virtual);
                    String configSizeFmt = ssiMediator.getConfigSizeFmt();
                    writer.write(formatSize(size, configSizeFmt));
                } else {
                    ssiMediator.log("#fsize--Invalid attribute: " + paramName);
                    writer.write(configErrMsg);
                }
            } catch (IOException e) {
                ssiMediator.log("#fsize--Couldn't get size for file: "
                        + substitutedValue, e);
                writer.write(configErrMsg);
            }
        }
        return lastModified;
    }


    public String repeat(char aChar, int numChars) {
        if (numChars < 0) {
            throw new IllegalArgumentException("Num chars can't be negative");
        }
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < numChars; i++) {
            buf.append(aChar);
        }
        return buf.toString();
    }


    public String padLeft(String str, int maxChars) {
        String result = str;
        int charsToAdd = maxChars - str.length();
        if (charsToAdd > 0) {
            result = repeat(' ', charsToAdd) + str;
        }
        return result;
    }


    //We try to mimick Apache here, as we do everywhere
    //All the 'magic' numbers are from the util_script.c Apache source file.
    protected String formatSize(long size, String format) {
        String retString = "";
        if (format.equalsIgnoreCase("bytes")) {
            DecimalFormat decimalFormat = new DecimalFormat("#,##0");
            retString = decimalFormat.format(size);
        } else {
            if (size == 0) {
                retString = "0k";
            } else if (size < ONE_KILOBYTE) {
                retString = "1k";
            } else if (size < ONE_MEGABYTE) {
                retString = Long.toString((size + 512) / ONE_KILOBYTE);
                retString += "k";
            } else if (size < 99 * ONE_MEGABYTE) {
                DecimalFormat decimalFormat = new DecimalFormat("0.0M");
                retString = decimalFormat.format(size / (double)ONE_MEGABYTE);
            } else {
                retString = Long.toString((size + (529 * ONE_KILOBYTE))
                        / ONE_MEGABYTE);
                retString += "M";
            }
            retString = padLeft(retString, 5);
        }
        return retString;
    }
}