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/*
 * @(#)JMSSelector.java	1.13 06/28/07
 */ 

package com.sun.messaging.jmq.jmsselector;

import java.io.StringReader;
import java.io.IOException;
import java.util.Vector;
import java.util.Hashtable;
import java.util.StringTokenizer;


/**
 * Provides JMS selector capability
 * 
 * Uses SQL parser in SQLParser.jj
 */
public class JMSSelector implements java.io.Serializable {
    transient SQLParser   parser;
    String    selectorPattern;
    transient Hashtable  msgHeader;
    transient int    jmsDeliveryMode;
    transient int    jmsPriority;
    transient String jmsMessageID;
    transient long   jmsTimestamp;
    transient String jmsCorrelationID;
    transient String jmsType;

    /**
     * Null Constructor.
     */ 
    public JMSSelector() {
        this(null, null);
    }

    private void readObject(java.io.ObjectInputStream ois)
        throws IOException, ClassNotFoundException
    {
        ois.defaultReadObject();
        msgHeader = new Hashtable();
        jmsDeliveryMode = 2;
        jmsPriority = 4;
        jmsMessageID = "";
        jmsTimestamp = 0L;
        jmsCorrelationID = "";
        jmsType = "";
    }    

    /**
     * Constructor.
     * 
     * @param pattern The selector pattern.
     * @param header The message header.
     */
    public JMSSelector(String pattern, Hashtable header) {
        if (pattern == null) {
            pattern = "";
        }

        if (header == null) {
            header = new Hashtable();
        }

        msgHeader = header;
        selectorPattern = pattern;

        //Initialze Header fields to their defaults
        jmsDeliveryMode = 2;
        jmsPriority = 4;
        jmsMessageID = "";
        jmsTimestamp = 0L;
        jmsCorrelationID = "";
        jmsType = "";

        //InputStream stream = new ByteArrayInputStream(selectorPattern.getBytes());
        StringReader stream = new StringReader(selectorPattern);

        parser = new SQLParser(this, stream);
    }

    /**
     * Returns the JMS Header property JMSDeliveryMode used by this JMSSelector
     * 
     * @return The JMS Header property JMSDeliveryMode used by this JMSSelector
     */
    public int getJMSDeliveryMode() {
        return jmsDeliveryMode;
    }

    /**
     * Sets the JMS Header property JMSDeliveryMode used by this JMSSelector
     * 
     * @param deliveryMode The JMS Header property JMSDeliveryMode used by this JMSSelector
     */
    public void setJMSDeliveryMode(int deliveryMode) {
        jmsDeliveryMode = deliveryMode;
    }

    /**
     * Returns the JMS Header property JMSPriority used by this JMSSelector
     * 
     * @return The JMS Header property JMSPriority used by this JMSSelector
     */
    public int getJMSPriority() {
        return jmsPriority;
    }

    /**
     * Sets the JMS Header property JMSPriority used by this JMSSelector
     * 
     * @param priority The JMS Header property JMSPriority used by this JMSSelector
     */
    public void setJMSPriority(int priority) {
        jmsPriority = priority;
    }

    /**
     * Returns the JMS Header property JMSMessageID used by this JMSSelector
     * 
     * @return The JMS Header property JMSMessageID used by this JMSSelector
     */
    public String getJMSMessageID() {
        return jmsMessageID;
    }

    /**
     * Sets the JMS Header property JMSMessageID used by this JMSSelector
     * 
     * @param messageID The JMS Header property JMSMessageID used by this JMSSelector
     */
    public void setJMSMessageID(String messageID) {
        jmsMessageID = messageID;
    }

    /**
     * Returns the JMS Header property JMSTimestamp used by this JMSSelector
     * 
     * @return The JMS Header property JMSTimestamp used by this JMSSelector
     */
    public long getJMSTimestamp() {
        return jmsTimestamp;
    }

    /**
     * Sets the JMS Header property JMSTimestamp used by this JMSSelector
     * 
     * @param timestamp The JMS Header property JMSTimestamp used by this JMSSelector
     */
    public void setJMSTimestamp(long timestamp) {
        jmsTimestamp = timestamp;
    }

    /**
     * Returns the JMS Header property JMSCorrelationID used by this JMSSelector
     * 
     * @return The JMS Header property JMSCorrelationID used by this JMSSelector
     */
    public String getJMSCorrelationID() {
        return jmsCorrelationID;
    }

    /**
     * Sets the JMS Header property JMSCorrelationID used by this JMSSelector
     * 
     * @param correlationID The JMS Header property JMSCorrelationID used by this JMSSelector
     */
    public void setJMSCorrelationID(String correlationID) {
        jmsCorrelationID = correlationID;
    }

    /**
     * Returns the JMS Header property JMSType used by this JMSSelector
     * 
     * @return The JMS Header property JMSType used by this JMSSelector
     */
    public String getJMSType() {
        return jmsType;
    }

    /**
     * Sets the JMS Header property JMSType used by this JMSSelector
     * 
     * @param type The JMS Header property JMSType used by this JMSSelector
     */
    public void setJMSType(String type) {
        jmsType = type;
    }

    /**
     * Sets all the JMS Header property fields used by this JMSSelector
     * 
     * @param deliveryMode The JMS Header property JMSDeliveryMode used by this JMSSelector
     * @param priority The JMS Header property JMSPriority used by this JMSSelector
     * @param messageID The JMS Header property JMSMessageID used by this JMSSelector
     * @param timestamp The JMS Header property JMSTimestamp used by this JMSSelector
     * @param correlationID The JMS Header property JMSCorrelationID used by this JMSSelector
     * @param type The JMS Header property JMSType used by this JMSSelector
     */
    public void setJMSHeaderFields(int deliveryMode,
                                   int priority,
                                   String messageID,
                                   long timestamp,
                                   String correlationID,
                                   String type) {
        jmsDeliveryMode = deliveryMode;
        jmsPriority = priority;
        jmsMessageID = messageID;
        jmsTimestamp = timestamp;
        jmsCorrelationID = correlationID;
        jmsType = type;
    }

    /**
     * Returns the selectorPattern used by this JMSSelector.
     * 
     * @return The selectorPattern used by this JMSSelector.
     */
    public String getSelectorPattern() {
        return selectorPattern;
    }

    /**
     * Validates the selector pattern that will be used by this JMSSelector to perform matches.
     * This selector pattern must conform to the SQL-92 specification for an SQL pattern.
     *
     * @exception InvalidJMSSelectorException If the selectorPattern does not conform to
     *            the SQL-92 specification for an SQL pattern.
     *
     */
    public void setSelectorPattern(String pattern) {
        if (pattern == null) {
            selectorPattern = "";
        } else {
            selectorPattern = pattern;
        }
    }

    /**
     * Validates the selector pattern that will be used by this JMSSelector to perform matches.
     * This selector pattern must conform to the SQL-92 specification for an SQL pattern.
     *
     * @exception InvalidJMSSelectorException If the selectorPattern does not conform to
     *            the SQL-92 specification for an SQL pattern.
     *
     */
    public void validateSelectorPattern(String pattern) throws InvalidJMSSelectorException, NullMessageHeaderException {
        if (pattern == null) {
            pattern = "";
        }
        selectorPattern = pattern;
        if ("".equals(selectorPattern)) {
            return;
        }
        try {
            match(msgHeader);
        } catch (NullMessageHeaderException e) {
            //System.out.println("sSP:NulMsgHdrExc" + e.getMessage()); e.printStackTrace();
            throw e;
        } catch (Throwable t) {
            //System.out.println("sSP:Throwable" + t.getMessage()); t.printStackTrace();
            throw new InvalidJMSSelectorException(selectorPattern);
        }
    }

    /**
     * Matches the message header passed in with the selector pattern set in this JMSSelector.
     * 
     * @param header The message header (a java.util.Hashtable object)
     * 
     * @return <code>true</code> if a match was made; <code>false</code> otherwise.
     * 
     * @exception InvalidJMSSelectorException If the selectorPattern does not conform to
     *            the SQL-92 specification for an SQL pattern.
     */
    public boolean match(Hashtable header) throws InvalidJMSSelectorException, NullMessageHeaderException {
        boolean matched = false;
        if (selectorPattern.equals("")) {
            matched = true;     // No selector
        } else {
            try {
                //InputStream stream = new ByteArrayInputStream(selectorPattern.getBytes());
                StringReader stream = new StringReader(selectorPattern);
                parser.ReInit(stream);
                //If null properties passed, then use the default (empty, non-null) properties
                matched = parser.match(header == null ? msgHeader : header);
            } catch (NullMessageHeaderException e) {
                throw e;
            } catch (Throwable t) {
                //note that the message of this exception is simply the invalid pattern
                //and should not be translated. 
                //System.out.println("throwing exc-"+t.getMessage()); t.printStackTrace();
                throw new InvalidJMSSelectorException(selectorPattern);
            }
        }
        return matched;
    }
    


    /**
     * Used to determine selector match in a SQL LIKE experssion as in
     * <\p>
     * str LIKE patternStr [ESCAPE escapeChar] 
     * <\p>
     *
     * @param patternStr The pattern used in SQL LIKE statement
     * @param str The string being compared with patternStr in SQL LIKE statement
     * @param escapeChar The escape character used to treat wildcards '_' and '%' as normal 
     *
     * @return
     * 
     * @see
     */
    boolean matchPattern(String patternStr, String str, char escapeChar) {
        //System.err.println("JMSSelector:matchPattern patternStr = \'" + patternStr + "\' str = \'" 
                           //+ str + "\'" + "\' escapeChar = \'" + escapeChar + "\'");
        boolean matched = false;
        String escapeCharStr = String.valueOf(escapeChar);
        String wildCards = "_%";
        String delims = wildCards + escapeCharStr;
        boolean escaped = false;
        int     index = 0;
        String  tok = null;

        try {
        if (str != null) {
            //int             index = 0;
            StringTokenizer st = new StringTokenizer(patternStr, delims, true);
            
            //Parse string into a Collection of tokens since we will need to peek forward as we
            //scan tokens
            //XX:JAVA2 Use ArrayList
            //ArrayList tokens = new ArrayList();
            Vector tokens = new Vector();
            while (st.hasMoreTokens()) {
                tok = st.nextToken();
                //XX:JAVA2
                //tokens.add(tok);
                tokens.addElement(tok);
            } 

            matched = true;
            
            //Iterate over tokens list and match each token with str
            int numTokens = tokens.size();
            for (int i=0; i<numTokens; i++) {
                //XX:JAVA2
                //tok = (String)tokens.get(i);
                tok = (String)tokens.elementAt(i);

                // Token can be a delimeter or actual token
                if (tok.equals(escapeCharStr) && (!escaped)) {
                    //Remember that the next character in patterStr must be treated literally
                    escaped = true;
                }
                else if (tok.equals("%") && (! escaped)) {
                    if (i == (numTokens - 1) ) {
 
                        // wildcard is last character in pattern,
                        // match entire string.
                        index = str.length();
                    } else if (i != numTokens-1) {    //There are more tokens. If not then we have a match
                    
                        /*
                        //Peek forward and get the next non delimter token if any
                        String nextNonDelimToken = null;
                        for (int j=i+1; j<numTokens; j++) {
                            String newTok = (String)tokens.get(j);
                            if ((!newTok.equals(escapeCharStr)) && (!newTok.equals("_")) && (!newTok.equals("%"))) {
                                nextNonDelimToken = newTok;
                                break;
                            }
                        }
                        */
                        
                        //Now scan forward
                        int _cnt = 0; //count of '_' delimeters encountered
                        ++i;
                        for (; i<numTokens; i++) {
                            //XX:JAVA2
                            //tok = (String)tokens.get(i);
                            tok = (String)tokens.elementAt(i);
                            
                            if (tok.equals(escapeCharStr) && (!escaped)) {
                                //Remember that the next character in patterStr must be treated literally
                                escaped = true;
                            }
                            else if (tok.equals("%") && (! escaped)) {
                                //% followed by % is same as %                      
                            }
                            else if (tok.equals("_") && (! escaped)) {
                                ++_cnt;
                            }
                            else {
                                //This is the nextNonDelimTok
                                int oldIndex = index;
 
                                if (i == (numTokens -1)) {
 
                                    // Not a general purpose fix for
                                    // wildcard matching bug.
                                    // At least handle case when
                                    // only one wildcard in pattern
                                    // that has a group of characters
                                    // trailing it.
                                    if (str.endsWith(tok)) {
                                        index = str.length() - tok.length();
                                    } else {
                                        matched = false;
                                        //if (debug) {
                                            //System.err.println("no matched5 for token: '" + tok + "'");

                                        //}
                                    }
                                } else {
                                    index = str.indexOf(tok, index);
                                }

                                if (index < 0) {
                                    matched = false;
                                    //System.err.println("no matched1 for token: '" + tok + "'");                              
                                } else {
                                    //Make sure that we have _cnt charecters between old index and new index
                                    if (index - oldIndex >= _cnt) {
                                        index += tok.length();
                                        //System.err.println("matched1: " + str.substring(0, index));                                        
                                    }
                                    else {
                                        matched = false;
                                        //System.err.println("no matched 2 for token: '" + tok + "'");                              
               
                                    }
                                }                                
                                
                                escaped = false;
                                break;
                            }
                        }                                               
                    }
                } else if (tok.equals("_") && (!escaped)) {
                    index++;
                    //System.err.println("matched2: " + str.substring(0, index));
                } else {
                    //Compare token read with corresponding string
                    int tokLen = tok.length();

                    //System.err.println("At index ="+ index + ", Token="+tok+ ",TokenLength=" + tokLen);
                    if (index + tokLen <= str.length()) {
                        String  subStr = null;

                        try {
                            subStr = str.substring(index, index + tokLen);
                        } catch (StringIndexOutOfBoundsException e) {
                            matched = false;
                            break;
                        }

                        if (!subStr.equalsIgnoreCase(tok)) {
                            matched = false;
                            //System.err.println("no matched3 for token: '" + tok + "'");                              

                            break;
                        } else {
                            index = index + tok.length();
                            //System.err.println("matched3: " + str.substring(0, index));
                        }
                    } else {
                        matched = false;
                        //System.err.println("no matched4 for token: '" + tok + "'");                              
                        
                        break;
                    }
                    escaped = false;
                }
            }
        }
        if (matched && index != str.length()) {
            //if (debug) {
                //System.err.println("no match5(remainder): " + str.substring(index, str.length()));
            //}
            matched = false;
        }
        //if (debug) {
            //System.err.println("JMSSelector:matchPattern patternStr = \'" +
                               //patternStr + "\' str = \'" +
                               //str + "\' matched = " + matched);
        //}
        } catch (StringIndexOutOfBoundsException e) {
            matched = false;
            //if (debug) {   
                //e.printStackTrace();
                //System.err.println("HANDLED OUTOFBOUNDS JMSSelector:matchPattern patternStr = \'" +
                               //patternStr + "\' str = \'" +
                               //str + "\' matched = " + matched);
 
           //} 
        } finally {
            //System.err.println("JMSSelector:matchPattern patternStr = \'" + patternStr + "\' str = \'" 
                               //+ str + "\' matched = " + matched);
            return matched;
        }
    }

    /**
     * Strip leading and trailing quotes from a String Literal.
     * Also, the nested quote character is represented as 2
     * consecutive quotes, so replace all occurrances of double
     * quotes with single quotes.
     */  
    String processStringLiteral(String strLiteral) {

        //System.out.println("JMSSel:pSL:strLiteral len="+strLiteral.length() + " str="+strLiteral);
        //for (int k = 0; k < strLiteral.length(); k++ ) { System.out.print("["+k+"]="+ (int)(strLiteral.charAt(k)) + " ") ; } System.out.println("");
        //Strip leading and trailing quotes
        strLiteral = strLiteral.substring(1, strLiteral.length()-1);

        // Replace all occurances of consecutive quotes as single quote.
        int index = strLiteral.indexOf("''");
        //System.out.println("JMSSel:pSL:strLiteral_stripped len="+strLiteral.length()+" idx''="+index+" str="+strLiteral);
        if (index > -1) {
            //XX:JAVA2 can use deleteCharAt(index);
            //StringBuffer sb = new StringBuffer(strLiteral);
            while (index != -1) {
                //XX:JAVA2
                //sb.deleteCharAt(index);
                strLiteral = (strLiteral.substring(0, index)).concat(strLiteral.substring(index+1));
                //XX:JAVA2
                //index = sb.toString().indexOf("''");
                index = strLiteral.indexOf("''");
            }
            //XX:JAVA2
            //strLiteral = sb.toString();
        }
        //System.out.println("JMSSel:pSL:processed_str len="+strLiteral.length()+" str="+strLiteral);
        //for (int k = 0; k < strLiteral.length(); k++ ) { System.out.print("["+k+"]="+ (int)(strLiteral.charAt(k)) + " ") ; } System.out.println("");
        return strLiteral;
    }

    public String toString() {

        return ("JMSSelector:\tPattern=\t`" + selectorPattern + "'" +
                "\n    Headers:\tDeliveryMode\t" + jmsDeliveryMode +
                "\n\t\tPriority\t" + jmsPriority +
                "\n\t\tMessageID\t`" + jmsMessageID + "'" +
                "\n\t\tTimestamp\t" + jmsTimestamp +
                "\n\t\tCorrelationID\t`" + jmsCorrelationID + "'" +
                "\n\t\tType\t\t`" + jmsType + "'" + "\n");
    }
}
