///////////////////////////////////////////////////////////////////
// Copyright (c) 2001 Nebula Internet Software, LLC
///////////////////////////////////////////////////////////////////
import java.io.*;
import java.util.*;
import java.awt.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.nebulais.ossearch.*;
/**
* Servlet Interface of the OSSearch web site search system.
* @version v1.1
* @author Nebula Internet Software, LLC
*/
public class OSSearchServlet extends HttpServlet implements SingleThreadModel {
private boolean is_error = false;
private Exception err;
private File rootPath;
private String rootUrl;
private Vector files;
private Vector urls;
private Vector results;
private PrintWriter out;
private String [] keywords;
/**
* Initialize the servlet
*/
public void init(ServletConfig config) throws ServletException {
super.init(config);
try {
// Read configuration file.
files = new Vector();
urls = new Vector();
configure();
} catch(Exception e) {
is_error=true;
err=e;
}
}
/**
* Returns blank search template
*/
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
// first, set the "content type" header of the response
res.setContentType("text/html");
// Get the response's PrintWriter to return text to the client.
out = res.getWriter();
// Print any error messages from initialization
if(is_error) {
error(err,"Error in Initialization:
" + err.toString());
}
File file = new File(OSSearchConstants.SERVLET_DIR,OSSearchConstants.TEMPLATE);
StringBuffer text = new StringBuffer();
results = new Vector();
StringBuffer word = new StringBuffer();
try {
// Open template document.
FileInputStream fis = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(fis,1024);
// Create results document from template
int val;
char c;
boolean reading=false;
byte [] line = new byte[1024];
while((val=bis.read(line,0,1024))!=-1) {
for(int b=0;b<val;b++) {
c = (char) line[b];
if(reading) {
if(c=='%') {
if(word.toString().equals("results") ||
word.toString().equals("keywords")) {
reading=false;
} else if(word.toString().equals("servlet_url")) {
text.append(OSSearchConstants.SERVLET_URL);
reading=false;
} else {
text.append("%");
text.append(word.toString());
}
word.setLength(0);
} else {
word.append(c);
}
} else if(c=='%') {
reading=true;
} else {
text.append(c);
}
}
}
bis.close();
if(reading) {
text.append("%");
text.append(word.toString());
}
// Write out the results document
out.println(text.toString());
out.close();
} catch(FileNotFoundException e) {
error(e,"Template not found: " + file + "
" + e.toString());
return;
}
catch(Exception e) {
error(e,e.toString() + "
" + text.toString());
return;
}
}
/**
* Reads information from form and searches web documents.
*/
public void doPost(HttpServletRequest req,
HttpServletResponse res) throws ServletException, IOException {
// first, set the "content type" header of the response
res.setContentType("text/html");
// Get the response's PrintWriter to return text to the client.
out = res.getWriter();
File file = new File(OSSearchConstants.SERVLET_DIR,OSSearchConstants.TEMPLATE);
StringBuffer text = new StringBuffer();
results = new Vector();
try {
// Get the keywords
String kw=req.getParameterValues("keywords")[0];
StringTokenizer tok = new StringTokenizer(kw," -\t~!@#$%^&*()_+=[{]};:'\",.<>?/|\\",false);
int len = tok.countTokens();
Vector kwv = new Vector();
for(int i=0;i<len;i++) {
kw = tok.nextToken();
if(isValidKeyword(kw)) {
kwv.addElement(kw);
}
}
len = kwv.size();
keywords = new String[len];
for(int i=0;i<len;i++) {
keywords[i] = kwv.elementAt(i).toString();
}
// Search web files and order into a list.
int sz = files.size();
String url;
for(int i=0;i<sz;i++) {
url = (String) urls.elementAt(i);
try {
HTMLRankObj rank = new HTMLRankObj((File) files.elementAt(i),keywords,url);
insertResult(rank);
} catch(RankException e) {
error(e,e.getMessage());
return;
}
}
// Open template document.
StringBuffer word = new StringBuffer();
FileInputStream fis = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(fis,1024);
// Create results document from template
int val;
char c;
boolean reading=false;
byte [] line = new byte[1024];
while((val=bis.read(line,0,1024))!=-1) {
for(int b=0;b<val;b++) {
c = (char) line[b];
if(reading) {
if(c=='%') {
if(word.toString().equals("results")) {
HTMLRankObj obj;
sz = Math.min(results.size(),15);
if(sz==0) {
text.append("No Document Found");
}
for(int i=0;i<sz;i++) {
obj = (HTMLRankObj) results.elementAt(i);
text.append((new Integer(i+1)).toString());
text.append(". ");
text.append(obj.getURL());
text.append("\">");
text.append(obj.getTitle());
text.append("");
text.append("
\n");
}
reading=false;
} else if(word.toString().equals("keywords")) {
for(int i=0;i<len;i++) {
text.append(keywords[i]);
if(i<len-1) {
text.append(" ");
}
}
reading=false;
} else if(word.toString().equals("servlet_url")) {
text.append(OSSearchConstants.SERVLET_URL);
reading=false;
} else {
text.append("%");
text.append(word.toString());
}
word.setLength(0);
} else {
word.append(c);
}
} else if(c=='%') {
reading=true;
} else {
text.append(c);
}
}
}
bis.close();
if(reading) {
text.append("%");
text.append(word.toString());
}
// Write out the results document
out.println(text.toString());
out.close();
} catch(FileNotFoundException e) {
error(e,"Template not found: " + file + "
" + e.toString());
return;
}
catch(Exception e) {
error(e,e.toString() + "
" + text.toString());
return;
}
}
/**
* Reads configuration file.
*/
public void configure() throws IOException {
File file = new File(OSSearchConstants.SERVLET_DIR,"data/ossearch/ossearch.cfg");
FileInputStream fis = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(fis,1024);
int val;
char c;
StringTokenizer tokenizer;
StringBuffer temp = new StringBuffer();
String word;
Boolean recursive = new Boolean(false);
Vector extensions=new Vector();
Vector exDirs=new Vector();
Vector exFiles=new Vector();
boolean readingKeyword=false;
boolean readingUrl=false;
boolean readingPath=false;
boolean readingRecursive=false;
boolean readingExtensions=false;
boolean readingExDirs=false;
boolean readingExFiles=false;
boolean end=false;
byte [] line = new byte[1024];
while(!end && (val=bis.read(line,0,1024))!=-1) {
for(int b=0;b<val;b++) {
c = (char) line[b];
if(c=='#' || isWhiteSpace(c)) {
if(readingKeyword) {
word=temp.toString();
if(word.compareTo("root_url")==0) {
readingUrl=true;
} else if(word.compareTo("root_path")==0) {
readingPath=true;
} else if(word.compareTo("recursive")==0) {
readingRecursive=true;
} else if(word.compareTo("extensions")==0) {
readingExtensions=true;
} else if(word.compareTo("exclude_dirs")==0) {
readingExDirs=true;
} else if(word.compareTo("exclude_files")==0) {
readingExFiles=true;
} else if(word.compareTo("end")==0) {
end=true;
break;
}
readingKeyword=false;
temp.setLength(0);
} else if(readingUrl && temp.length()!=0) {
rootUrl=temp.toString();
if(!rootUrl.endsWith("/")) {
rootUrl += "/";
}
readingUrl=false;
temp.setLength(0);
} else if(readingPath && temp.length()!=0) {
rootPath=new File(temp.toString());
readingPath=false;
temp.setLength(0);
} else if(readingRecursive && temp.length()!=0) {
recursive=new Boolean(temp.toString().trim());
readingRecursive=false;
temp.setLength(0);
} else if(readingExtensions && temp.length()!=0) {
extensions.addElement(temp.toString());
temp.setLength(0);
} else if(readingExDirs && temp.length()!=0) {
exDirs.addElement(temp.toString());
temp.setLength(0);
} else if(readingExFiles && temp.length()!=0) {
exFiles.addElement(temp.toString());
temp.setLength(0);
}
if(c=='#') {
readingKeyword=true;
readingExtensions=false;
readingExDirs=false;
readingExFiles=false;
}
} else {
temp.append(c);
}
}
}
bis.close();
list(new GenericFileFilter(rootPath,extensions,exFiles),rootPath,"",exDirs,recursive.booleanValue());
}
/**
* List the files in the given directory
* @param filter GenericFileFilter to use
* @param dir Directory to list
* @param rel Relative path from the root directory
* @param exclude Directories to exclude
* @param recursive True, if directories should be recursively listed.
*/
public void list(GenericFileFilter filter, File dir, String rel, Vector exclude, boolean recursive) throws IOException {
// Add to files and urls list
String [] ls = dir.list(filter);
int sz = ls.length;
for(int i=0;i<sz;i++) {
files.addElement(new File(dir,ls[i]));
urls.addElement(rootUrl + rel + ls[i]);
}
// Recursively list
if(recursive) {
ls = dir.list(new DirectoryFilter(dir,exclude));
sz = ls.length;
for(int i=0;i<sz;i++) {
list(filter,new File(dir,ls[i]),rel + ls[i] + "/",exclude,recursive);
}
}
}
/**
* Returns an error message back to the web browser
* @param ex Exception for printing the stack (passing null will cause the stack not to be printed)
* @param error Message to display in error message.
*/
public void error(Exception ex, String error) {
String text = "ErrorError occured!";
text += "
Please report error to mailto:[email protected]?subject=Quote-a-Price Error\">";
text += "[email protected].
Use \"Back\" arrow to continue\n";
text += "
";
text += error;
out.println(text);
if(ex!=null) {
ex.printStackTrace(out);
}
text = "";
out.println(text);
}
/**
* Insert a search result into the results list
* @param obj HTMLRankObj to insert into the results list.
*/
public void insertResult(HTMLRankObj obj) {
double score = obj.getScore();
double test;
int sz = results.size();
boolean inserted=false;
if(score>0.0) {
for(int i=0;i<sz;i++) {
test = ((HTMLRankObj) results.elementAt(i)).getScore();
if(score>test) {
results.insertElementAt(obj,i);
inserted=true;
break;
}
}
if(!inserted) {
results.addElement(obj);
}
}
}
/**
* Is the string a valid keyword or should it be excluded?
*/
public boolean isValidKeyword(String kw) {
int sz;
if(kw.length()<=1) {
return false;
} else if(kw.length()==2) {
sz = OSSearchConstants.EXCLUDE_2.length;
for(int i=0;i<sz;i++) {
if(kw.compareTo(OSSearchConstants.EXCLUDE_2[i])==0) {
return false;
}
}
} else if(kw.length()==3) {
sz = OSSearchConstants.EXCLUDE_3.length;
for(int i=0;i<sz;i++) {
if(kw.compareTo(OSSearchConstants.EXCLUDE_3[i])==0) {
return false;
}
}
} else if(kw.length()==4) {
sz = OSSearchConstants.EXCLUDE_4.length;
for(int i=0;i<sz;i++) {
if(kw.compareTo(OSSearchConstants.EXCLUDE_4[i])==0) {
return false;
}
}
} else if(kw.length()==5) {
sz = OSSearchConstants.EXCLUDE_5.length;
for(int i=0;i<sz;i++) {
if(kw.compareTo(OSSearchConstants.EXCLUDE_5[i])==0) {
return false;
}
}
} else if(kw.length()==6) {
sz = OSSearchConstants.EXCLUDE_6.length;
for(int i=0;i<sz;i++) {
if(kw.compareTo(OSSearchConstants.EXCLUDE_6[i])==0) {
return false;
}
}
}
return true;
}
/**
* Is the given character a whitespace character?
*/
public boolean isWhiteSpace(char c) {
if(c==' ' || c=='\r' || c=='\n' || c=='\t') {
return(true);
} else {
return(false);
}
}
}
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