// Copyright (c) 2003-2014, Jodd Team (jodd.org). All Rights Reserved.
package jodd.typeconverter.impl;
import jodd.JoddCore;
import jodd.typeconverter.TypeConversionException;
import jodd.typeconverter.TypeConverter;
import jodd.util.CsvUtil;
import java.io.UnsupportedEncodingException;
import java.sql.Clob;
import java.sql.SQLException;
/**
* Converts given object to <code>String</code>.
* Conversion rules:
* <ul>
* <li><code>null</code> value is returned as <code>null</code></li>
* <li>for <code>CharSequence</code> type returns toString value</li>
* <li><code>Class</code> returns cass name</li>
* <li><code>byte[]</code> is used for creating UTF8 string</li>
* <li><code>char[]</code> is used for creating string</li>
* <li><code>Clob</code> is converted</li>
* <li>finally, <code>toString()</code> value is returned.</li>
* </ul>
*/
public class StringConverter implements TypeConverter<String> {
public String convert(Object value) {
if (value == null) {
return null;
}
if (value instanceof CharSequence) { // for speed
return value.toString();
}
Class type = value.getClass();
if (type == Class.class) {
return ((Class) value).getName();
}
if (type.isArray()) {
if (type == byte[].class) {
byte[] valueArray = (byte[]) value;
try {
return new String(valueArray, 0, valueArray.length, JoddCore.encoding);
} catch (UnsupportedEncodingException ueex) {
throw new TypeConversionException(ueex);
}
}
if (type == char[].class) {
char[] charArray = (char[]) value;
return new String(charArray);
}
return CsvUtil.toCsvString((Object[])value);
}
if (value instanceof Clob) {
Clob clob = (Clob) value;
try {
long length = clob.length();
if (length > Integer.MAX_VALUE) {
throw new TypeConversionException("Clob is too big.");
}
return clob.getSubString(1, (int) length);
} catch (SQLException sex) {
throw new TypeConversionException(value, sex);
}
}
return value.toString();
}
}