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package org.hsqldb.rowio;

import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.persist.TextFileSettings;

// fredt@users - 2.3.4 - patch for user-defined quote char by Damjan Jovanovic

Fields in the source file need not be quoted. Methods in this class unquote
the fields if they are quoted and handle quote character doubling in this
case.
Author:
Bob Preston (sqlbob@users dot sourceforge.net)
Version:
2.3.4
Since:
1.7.0/**
 * Fields in the source file need not be quoted. Methods in this class unquote
 * the fields if they are quoted and handle quote character doubling in this
 * case.
 *
 * @author Bob Preston (sqlbob@users dot sourceforge.net)
 * @version 2.3.4
 * @since 1.7.0
 */
public class RowInputTextQuoted extends RowInputText {

    private static final int NORMAL_FIELD   = 0;
    private static final int NEED_END_QUOTE = 1;
    private static final int FOUND_QUOTE    = 2;
    private final char       quoteChar;
    int                      charLength = 0;

    public RowInputTextQuoted(TextFileSettings textFileSettings) {

        super(textFileSettings);

        this.quoteChar = textFileSettings.quoteChar;
    }

    public void setSource(String text, long pos, int byteSize) {

        super.setSource(text, pos, byteSize);

        charLength = text.length();

        for (int i = charLength - 1; i > -1; i--) {
            if (text.charAt(i) == TextFileSettings.CR_CHAR
                    || text.charAt(i) == TextFileSettings.LF_CHAR) {
                charLength--;
            } else {
                break;
            }
        }
    }

    protected String getField(String sep, int sepLen, boolean isEnd) {

        //fredt - now the only supported behaviour is emptyIsNull
        String s = null;

        if (next >= charLength || text.charAt(next) != quoteChar) {
            return super.getField(sep, sepLen, isEnd);
        }

        try {
            field++;

            StringBuilder sb    = new StringBuilder();
            boolean       done  = false;
            int           state = NORMAL_FIELD;
            int           end   = -1;

            if (!isEnd) {
                end = text.indexOf(sep, next);
            }

            for (; next < charLength; next++) {
                switch (state) {

                    case NORMAL_FIELD :
                    default :
                        if (next == end) {
                            next += sepLen;
                            done = true;
                        } else if (text.charAt(next) == quoteChar) {

                            //-- Beginning of field
                            state = NEED_END_QUOTE;
                        } else {
                            sb.append(text.charAt(next));
                        }
                        break;

                    case NEED_END_QUOTE :
                        if (text.charAt(next) == quoteChar) {
                            state = FOUND_QUOTE;
                        } else {
                            sb.append(text.charAt(next));
                        }
                        break;

                    case FOUND_QUOTE :
                        if (text.charAt(next) == quoteChar) {

                            //-- Escaped quote
                            sb.append(text.charAt(next));

                            state = NEED_END_QUOTE;
                        } else {
                            if (!isEnd) {
                                end = text.indexOf(sep, next);

                                if (end < 0) {
                                    end = charLength;
                                }

                                sb.append(text, next, end);

                                next = end + sepLen;
                                done = true;
                            } else {
                                next  += sepLen - 1;
                                state = NORMAL_FIELD;
                            }
                        }
                        break;
                }

                if (done) {
                    break;
                }
            }

            s = sb.toString();
        } catch (Exception e) {
            String message = String.valueOf(field);

            throw Error.error(e, ErrorCode.M_TEXT_SOURCE_FIELD_ERROR, message);
        }

        return s;
    }
}