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/*
* @(#)SearchSequence.java 1.16 07/05/04
*/
package com.sun.mail.imap.protocol;
import java.util.*;
import java.io.IOException;
import javax.mail.*;
import javax.mail.search.*;
import com.sun.mail.iap.*;
/**
* This class traverses a search-tree and generates the
* corresponding IMAP search sequence.
*
* @author John Mani
*/
class SearchSequence {
/**
* Generate the IMAP search sequence for the given search expression.
*/
static Argument generateSequence(SearchTerm term, String charset)
throws SearchException, IOException {
/* Call the appropriate handler depending on the type of
* the search-term ...
*/
if (term instanceof AndTerm) // AND
return and((AndTerm)term, charset);
else if (term instanceof OrTerm) // OR
return or((OrTerm)term, charset);
else if (term instanceof NotTerm) // NOT
return not((NotTerm)term, charset);
else if (term instanceof HeaderTerm) // HEADER
return header((HeaderTerm)term, charset);
else if (term instanceof FlagTerm) // FLAG
return flag((FlagTerm)term);
else if (term instanceof FromTerm) { // FROM
FromTerm fterm = (FromTerm)term;
return from(fterm.getAddress().toString(), charset);
}
else if (term instanceof FromStringTerm) { // FROM
FromStringTerm fterm = (FromStringTerm)term;
return from(fterm.getPattern(), charset);
}
else if (term instanceof RecipientTerm) { // RECIPIENT
RecipientTerm rterm = (RecipientTerm)term;
return recipient(rterm.getRecipientType(),
rterm.getAddress().toString(),
charset);
}
else if (term instanceof RecipientStringTerm) { // RECIPIENT
RecipientStringTerm rterm = (RecipientStringTerm)term;
return recipient(rterm.getRecipientType(),
rterm.getPattern(),
charset);
}
else if (term instanceof SubjectTerm) // SUBJECT
return subject((SubjectTerm)term, charset);
else if (term instanceof BodyTerm) // BODY
return body((BodyTerm)term, charset);
else if (term instanceof SizeTerm) // SIZE
return size((SizeTerm)term);
else if (term instanceof SentDateTerm) // SENTDATE
return sentdate((SentDateTerm)term);
else if (term instanceof ReceivedDateTerm) // INTERNALDATE
return receiveddate((ReceivedDateTerm)term);
else if (term instanceof MessageIDTerm) // MessageID
return messageid((MessageIDTerm)term, charset);
else
throw new SearchException("Search too complex");
}
/*
* Check if the "text" terms in the given SearchTerm contain
* non US-ASCII characters.
*/
static boolean isAscii(SearchTerm term) {
if (term instanceof AndTerm || term instanceof OrTerm) {
SearchTerm[] terms;
if (term instanceof AndTerm)
terms = ((AndTerm)term).getTerms();
else
terms = ((OrTerm)term).getTerms();
for (int i = 0; i < terms.length; i++)
if (!isAscii(terms[i])) // outta here !
return false;
} else if (term instanceof NotTerm)
return isAscii(((NotTerm)term).getTerm());
else if (term instanceof StringTerm)
return isAscii(((StringTerm)term).getPattern());
else if (term instanceof AddressTerm)
return isAscii(((AddressTerm)term).getAddress().toString());
// Any other term returns true.
return true;
}
private static boolean isAscii(String s) {
int l = s.length();
for (int i=0; i < l; i++) {
if ((int)s.charAt(i) > 0177) // non-ascii
return false;
}
return true;
}
private static Argument and(AndTerm term, String charset)
throws SearchException, IOException {
// Combine the sequences for both terms
SearchTerm[] terms = term.getTerms();
// Generate the search sequence for the first term
Argument result = generateSequence(terms[0], charset);
// Append other terms
for (int i = 1; i < terms.length; i++)
result.append(generateSequence(terms[i], charset));
return result;
}
private static Argument or(OrTerm term, String charset)
throws SearchException, IOException {
SearchTerm[] terms = term.getTerms();
/* The IMAP OR operator takes only two operands. So if
* we have more than 2 operands, group them into 2-operand
* OR Terms.
*/
if (terms.length > 2) {
SearchTerm t = terms[0];
// Include rest of the terms
for (int i = 1; i < terms.length; i++)
t = new OrTerm(t, terms[i]);
term = (OrTerm)t; // set 'term' to the new jumbo OrTerm we
// just created
terms = term.getTerms();
}
// 'term' now has only two operands
Argument result = new Argument();
// Add the OR search-key, if more than one term
if (terms.length > 1)
result.writeAtom("OR");
/* If this term is an AND expression, we need to enclose it
* within paranthesis.
*
* AND expressions are either AndTerms or FlagTerms
*/
if (terms[0] instanceof AndTerm || terms[0] instanceof FlagTerm)
result.writeArgument(generateSequence(terms[0], charset));
else
result.append(generateSequence(terms[0], charset));
// Repeat the above for the second term, if there is one
if (terms.length > 1) {
if (terms[1] instanceof AndTerm || terms[1] instanceof FlagTerm)
result.writeArgument(generateSequence(terms[1], charset));
else
result.append(generateSequence(terms[1], charset));
}
return result;
}
private static Argument not(NotTerm term, String charset)
throws SearchException, IOException {
Argument result = new Argument();
// Add the NOT search-key
result.writeAtom("NOT");
/* If this term is an AND expression, we need to enclose it
* within paranthesis.
*
* AND expressions are either AndTerms or FlagTerms
*/
SearchTerm nterm = term.getTerm();
if (nterm instanceof AndTerm || nterm instanceof FlagTerm)
result.writeArgument(generateSequence(nterm, charset));
else
result.append(generateSequence(nterm, charset));
return result;
}
private static Argument header(HeaderTerm term, String charset)
throws SearchException, IOException {
Argument result = new Argument();
result.writeAtom("HEADER");
result.writeString(term.getHeaderName());
result.writeString(term.getPattern(), charset);
return result;
}
private static Argument messageid(MessageIDTerm term, String charset)
throws SearchException, IOException {
Argument result = new Argument();
result.writeAtom("HEADER");
result.writeString("Message-ID");
// XXX confirm that charset conversion ought to be done
result.writeString(term.getPattern(), charset);
return result;
}
private static Argument flag(FlagTerm term) throws SearchException {
boolean set = term.getTestSet();
Argument result = new Argument();
Flags flags = term.getFlags();
Flags.Flag[] sf = flags.getSystemFlags();
String[] uf = flags.getUserFlags();
if (sf.length == 0 && uf.length == 0)
throw new SearchException("Invalid FlagTerm");
for (int i = 0; i < sf.length; i++) {
if (sf[i] == Flags.Flag.DELETED)
result.writeAtom(set ? "DELETED": "UNDELETED");
else if (sf[i] == Flags.Flag.ANSWERED)
result.writeAtom(set ? "ANSWERED": "UNANSWERED");
else if (sf[i] == Flags.Flag.DRAFT)
result.writeAtom(set ? "DRAFT": "UNDRAFT");
else if (sf[i] == Flags.Flag.FLAGGED)
result.writeAtom(set ? "FLAGGED": "UNFLAGGED");
else if (sf[i] == Flags.Flag.RECENT)
result.writeAtom(set ? "RECENT": "OLD");
else if (sf[i] == Flags.Flag.SEEN)
result.writeAtom(set ? "SEEN": "UNSEEN");
}
for (int i = 0; i < uf.length; i++) {
result.writeAtom(set ? "KEYWORD" : "UNKEYWORD");
result.writeAtom(uf[i]);
}
return result;
}
private static Argument from(String address, String charset)
throws SearchException, IOException {
Argument result = new Argument();
result.writeAtom("FROM");
result.writeString(address, charset);
return result;
}
private static Argument recipient(Message.RecipientType type,
String address, String charset)
throws SearchException, IOException {
Argument result = new Argument();
if (type == Message.RecipientType.TO)
result.writeAtom("TO");
else if (type == Message.RecipientType.CC)
result.writeAtom("CC");
else if (type == Message.RecipientType.BCC)
result.writeAtom("BCC");
else
throw new SearchException("Illegal Recipient type");
result.writeString(address, charset);
return result;
}
private static Argument subject(SubjectTerm term, String charset)
throws SearchException, IOException {
Argument result = new Argument();
result.writeAtom("SUBJECT");
result.writeString(term.getPattern(), charset);
return result;
}
private static Argument body(BodyTerm term, String charset)
throws SearchException, IOException {
Argument result = new Argument();
result.writeAtom("BODY");
result.writeString(term.getPattern(), charset);
return result;
}
private static Argument size(SizeTerm term)
throws SearchException {
Argument result = new Argument();
switch (term.getComparison()) {
case ComparisonTerm.GT:
result.writeAtom("LARGER");
break;
case ComparisonTerm.LT:
result.writeAtom("SMALLER");
break;
default:
// GT and LT is all we get from IMAP for size
throw new SearchException("Cannot handle Comparison");
}
result.writeNumber(term.getNumber());
return result;
}
// Date SEARCH stuff ...
/**
* Print an IMAP Date string, that is suitable for the Date
* SEARCH commands.
*
* The IMAP Date string is :
* date ::= date_day "-" date_month "-" date_year
*
* Note that this format does not contain the TimeZone
*/
private static String monthTable[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
// A GregorianCalendar object in the current timezone
private static Calendar cal = new GregorianCalendar();
private static String toIMAPDate(Date date) {
StringBuffer s = new StringBuffer();
cal.setTime(date);
s.append(cal.get(Calendar.DATE)).append("-");
s.append(monthTable[cal.get(Calendar.MONTH)]).append('-');
s.append(cal.get(Calendar.YEAR));
return s.toString();
}
private static Argument sentdate(DateTerm term)
throws SearchException {
Argument result = new Argument();
String date = toIMAPDate(term.getDate());
switch (term.getComparison()) {
case ComparisonTerm.GT:
result.writeAtom("SENTSINCE " + date);
break;
case ComparisonTerm.EQ:
result.writeAtom("SENTON " + date);
break;
case ComparisonTerm.LT:
result.writeAtom("SENTBEFORE " + date);
break;
case ComparisonTerm.GE:
result.writeAtom("OR SENTSINCE " + date + " SENTON " + date);
break;
case ComparisonTerm.LE:
result.writeAtom("OR SENTBEFORE " + date + " SENTON " + date);
break;
case ComparisonTerm.NE:
result.writeAtom("NOT SENTON " + date);
break;
default:
throw new SearchException("Cannot handle Date Comparison");
}
return result;
}
private static Argument receiveddate(DateTerm term)
throws SearchException {
Argument result = new Argument();
String date = toIMAPDate(term.getDate());
switch (term.getComparison()) {
case ComparisonTerm.GT:
result.writeAtom("SINCE " + date);
break;
case ComparisonTerm.EQ:
result.writeAtom("ON " + date);
break;
case ComparisonTerm.LT:
result.writeAtom("BEFORE " + date);
break;
case ComparisonTerm.GE:
result.writeAtom("OR SINCE " + date + " ON " + date);
break;
case ComparisonTerm.LE:
result.writeAtom("OR BEFORE " + date + " ON " + date);
break;
case ComparisonTerm.NE:
result.writeAtom("NOT ON " + date);
break;
default:
throw new SearchException("Cannot handle Date Comparison");
}
return result;
}
}
