rowoutputtextquoted.java

hsql是很有名的嵌入式数据库

/* Copyright (c) 2001-2005, The HSQL Development Group
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 * Redistributions in binary form must reproduce the above copyright notice,
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 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package org.hsqldb.rowio;

import org.hsqldb.lib.StringConverter;

/**
 * This class quotes strings only if they contain the quote character or
 * the separator for the field. The quote character is doubled.
 *
 * @author sqlbob@users (RMP)
 * @version 1.8.0
 * @since 1.7.0
 */
public class RowOutputTextQuoted extends RowOutputText {

    public RowOutputTextQuoted(String fieldSep, String varSep,
                               String longvarSep, boolean allQuoted,
                               String encoding) {
        super(fieldSep, varSep, longvarSep, allQuoted, encoding);
    }

    protected String checkConvertString(String s, String sep) {

        if (allQuoted || s.length() == 0 || s.indexOf('\"') != -1
                || (sep.length() > 0 && s.indexOf(sep) != -1)
                || hasUnprintable(s)) {
            s = StringConverter.toQuotedString(s, '\"', true);
        }

        return s;
    }

    private boolean hasUnprintable(String s) {

        for (int i = 0, len = s.length(); i < len; i++) {
            if (Character.isISOControl(s.charAt(i))) {
                return true;
            }
        }

        return false;
    }
}