io.milton.http.annotated.NullSafeDateTimeConverter Maven / Gradle / Ivy
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/*
*
* Copyright 2014 McEvoy Software Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.milton.http.annotated;
import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.beanutils.converters.AbstractConverter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Null safe and pulls the timezone from the request using DataBinder.getTimeZoneForRequest
*
* Mostly copied from DateTimeConverter
*
* @author brad
*/
public class NullSafeDateTimeConverter extends AbstractConverter {
private static final Logger log = LoggerFactory.getLogger(NullSafeDateTimeConverter.class);
private static final String PACKAGE = "io.milton.http.annotated.";
private static Logger log() {
return log;
}
private String[] patterns;
private String displayPatterns;
private Locale locale;
private boolean useLocaleFormat;
// ----------------------------------------------------------- Constructors
/**
* Construct a Date/Time Converter that throws a
* ConversionException if an error occurs.
*/
public NullSafeDateTimeConverter() {
super();
}
/**
* Construct a Date/Time Converter that returns a default value if an
* error occurs.
*
* @param defaultValue The default value to be returned if the value to be
* converted is missing or an error occurs converting the value.
*/
public NullSafeDateTimeConverter(Object defaultValue) {
super(defaultValue);
}
@Override
protected Object handleMissing(Class type) {
return null;
}
@Override
protected Class getDefaultType() {
return Date.class;
}
public java.util.TimeZone getTimeZone() {
return DataBinder.getTimeZoneForRequest();
}
/**
* Indicate whether conversion should use a format/pattern or not.
*
* @param useLocaleFormat true if the format for the locale
* should be used, otherwise false
*/
public void setUseLocaleFormat(boolean useLocaleFormat) {
this.useLocaleFormat = useLocaleFormat;
}
/**
* Return the Locale for the Converter
* (or null if none specified).
*
* @return The locale to use for conversion
*/
public Locale getLocale() {
return locale;
}
/**
* Set the Locale for the Converter.
*
* @param locale The Locale.
*/
public void setLocale(Locale locale) {
this.locale = locale;
setUseLocaleFormat(true);
}
/**
* Set a date format pattern to use to convert dates to/from a
* java.lang.String.
*
* @see SimpleDateFormat
* @param pattern The format pattern.
*/
public void setPattern(String pattern) {
setPatterns(new String[]{pattern});
}
/**
* Return the date format patterns used to convert dates to/from a
* java.lang.String (or null if none specified).
*
* @see SimpleDateFormat
* @return Array of format patterns.
*/
public String[] getPatterns() {
return patterns;
}
/**
* Set the date format patterns to use to convert dates to/from a
* java.lang.String.
*
* @see SimpleDateFormat
* @param patterns Array of format patterns.
*/
public void setPatterns(String[] patterns) {
this.patterns = patterns;
if (patterns != null && patterns.length > 1) {
StringBuilder buffer = new StringBuilder();
for (int i = 0; i < patterns.length; i++) {
if (i > 0) {
buffer.append(", ");
}
buffer.append(patterns[i]);
}
displayPatterns = buffer.toString();
}
setUseLocaleFormat(true);
}
// ------------------------------------------------------ Protected Methods
/**
* Convert an input Date/Calendar object into a String.
*
* N.B.If the converter has been configured to with one or more
* patterns (using setPatterns()), then the first pattern will
* be used to format the date into a String. Otherwise the default
* DateFormat for the default locale (and style if
* configured) will be used.
*
* @param value The input value to be converted
* @return the converted String value.
* @throws Throwable if an error occurs converting to a String
*/
@Override
protected String convertToString(Object value) throws Throwable {
Date date = null;
if (value instanceof Date) {
date = (Date) value;
} else if (value instanceof Calendar) {
date = ((Calendar) value).getTime();
} else if (value instanceof Long) {
date = new Date(((Long) value));
}
String result;
if (useLocaleFormat && date != null) {
DateFormat format;
if (patterns != null && patterns.length > 0) {
format = getFormat(patterns[0]);
} else {
format = getFormat(locale, timeZone());
}
logFormat("Formatting", format);
result = format.format(date);
if (log().isDebugEnabled()) {
log().debug(" Converted to String using format '" + result + "'");
}
} else {
result = value.toString();
if (log().isDebugEnabled()) {
log().debug(" Converted to String using toString() '" + result + "'");
}
}
return result;
}
/**
* Convert the input object into a Date object of the specified type.
*
* This method handles conversions between the following types:
*
* java.util.Datejava.util.Calendarjava.sql.Datejava.sql.Timejava.sql.Timestamp
*
* It also handles conversion from a String to any of the above
* types.
*
*
* For String conversion, if the converter has been configured
* with one or more patterns (using setPatterns()), then the
* conversion is attempted with each of the specified patterns. Otherwise
* the default DateFormat for the default locale (and
* style if configured) will be used.
*
* @param targetType Data type to which this value should be converted.
* @param value The input value to be converted.
* @return The converted value.
* @throws Exception if conversion cannot be performed successfully
*/
@Override
protected Object convertToType(Class targetType, Object value) throws Exception {
Class sourceType = value.getClass();
// Handle java.sql.Timestamp
if (value instanceof java.sql.Timestamp) {
// ---------------------- JDK 1.3 Fix ----------------------
// N.B. Prior to JDK 1.4 the Timestamp's getTime() method
// didn't include the milliseconds. The following code
// ensures it works consistently accross JDK versions
java.sql.Timestamp timestamp = (java.sql.Timestamp) value;
long timeInMillis = ((timestamp.getTime() / 1000) * 1000);
timeInMillis += timestamp.getNanos() / 1000000;
// ---------------------- JDK 1.3 Fix ----------------------
return toDate(targetType, timeInMillis);
}
// Handle Date (includes java.sql.Date & java.sql.Time)
if (value instanceof Date) {
Date date = (Date) value;
return toDate(targetType, date.getTime());
}
// Handle Calendar
if (value instanceof Calendar) {
Calendar calendar = (Calendar) value;
return toDate(targetType, calendar.getTime().getTime());
}
// Handle Long
if (value instanceof Long) {
Long longObj = (Long) value;
return toDate(targetType, longObj);
}
// Convert all other types to String & handle
String stringValue = value.toString().trim();
if (stringValue.length() == 0) {
return handleMissing(targetType);
}
// Parse the Date/Time
if (useLocaleFormat) {
Calendar calendar;
if (patterns != null && patterns.length > 0) {
calendar = parse(sourceType, targetType, stringValue);
} else {
DateFormat format = getFormat(locale, timeZone());
calendar = parse(sourceType, targetType, stringValue, format);
}
if (Calendar.class.isAssignableFrom(targetType)) {
return calendar;
} else {
return toDate(targetType, calendar.getTime().getTime());
}
}
// Default String conversion
return toDate(targetType, stringValue);
}
/**
* Convert a long value to the specified Date type for this
* Converter.
*
*
* This method handles conversion to the following types:
*
* java.util.Datejava.util.Calendarjava.sql.Datejava.sql.Timejava.sql.Timestamp
*
* @param type The Date type to convert to
* @param value The long value to convert.
* @return The converted date value.
*/
private Object toDate(Class type, long value) {
// java.util.Date
if (type.equals(Date.class)) {
return new Date(value);
}
// java.sql.Date
if (type.equals(java.sql.Date.class)) {
return new java.sql.Date(value);
}
// java.sql.Time
if (type.equals(java.sql.Time.class)) {
return new java.sql.Time(value);
}
// java.sql.Timestamp
if (type.equals(java.sql.Timestamp.class)) {
return new java.sql.Timestamp(value);
}
// java.util.Calendar
if (type.equals(Calendar.class)) {
Calendar calendar;
TimeZone timeZone = timeZone();
if (locale == null && timeZone == null) {
calendar = Calendar.getInstance();
} else if (locale == null) {
calendar = Calendar.getInstance(timeZone);
} else if (timeZone == null) {
calendar = Calendar.getInstance(locale);
} else {
calendar = Calendar.getInstance(timeZone, locale);
}
calendar.setTime(new Date(value));
calendar.setLenient(false);
return calendar;
}
String msg = toString(getClass()) + " cannot handle conversion to '"
+ toString(type) + "'";
if (log().isWarnEnabled()) {
log().warn(" " + msg);
}
throw new ConversionException(msg);
}
/**
* Default String to Date conversion.
*
* This method handles conversion from a String to the following types:
*
* java.sql.Datejava.sql.Timejava.sql.Timestamp
*
* N.B. No default String conversion mechanism is provided
* for java.util.Date and java.util.Calendar type.
*
* @param type The Number type to convert to
* @param value The String value to convert.
* @return The converted Number value.
*/
private Object toDate(Class type, String value) {
// java.sql.Date
if (type.equals(java.sql.Date.class)) {
try {
return java.sql.Date.valueOf(value);
} catch (IllegalArgumentException e) {
throw new ConversionException(
"String must be in JDBC format [yyyy-MM-dd] to create a java.sql.Date");
}
}
// java.sql.Time
if (type.equals(java.sql.Time.class)) {
try {
return java.sql.Time.valueOf(value);
} catch (IllegalArgumentException e) {
throw new ConversionException(
"String must be in JDBC format [HH:mm:ss] to create a java.sql.Time");
}
}
// java.sql.Timestamp
if (type.equals(java.sql.Timestamp.class)) {
try {
return java.sql.Timestamp.valueOf(value);
} catch (IllegalArgumentException e) {
throw new ConversionException(
"String must be in JDBC format [yyyy-MM-dd HH:mm:ss.fffffffff] "
+ "to create a java.sql.Timestamp");
}
}
String msg = toString(getClass()) + " does not support default String to '"
+ toString(type) + "' conversion.";
if (log().isWarnEnabled()) {
log().warn(" " + msg);
log().warn(" (N.B. Re-configure Converter or use alternative implementation)");
}
throw new ConversionException(msg);
}
/**
* Return a DateFormat for the Locale.
*
* @param locale The Locale to create the Format with (may be null)
* @param timeZone The Time Zone create the Format with (may be null)
*
* @return A Date Format.
*/
protected DateFormat getFormat(Locale locale, TimeZone timeZone) {
DateFormat format;
if (locale == null) {
format = DateFormat.getDateInstance(DateFormat.SHORT);
} else {
format = DateFormat.getDateInstance(DateFormat.SHORT, locale);
}
if (timeZone != null) {
format.setTimeZone(timeZone);
}
return format;
}
/**
* Create a date format for the specified pattern.
*
* @param pattern The date pattern
* @return The DateFormat
*/
private DateFormat getFormat(String pattern) {
DateFormat format = new SimpleDateFormat(pattern);
TimeZone timeZone = timeZone();
if (timeZone != null) {
format.setTimeZone(timeZone);
}
return format;
}
/**
* Parse a String date value using the set of patterns.
*
* @param sourceType The type of the value being converted
* @param targetType The type to convert the value to.
* @param value The String date value.
*
* @return The converted Date object.
* @throws Exception if an error occurs parsing the date.
*/
private Calendar parse(Class sourceType, Class targetType, String value) throws Exception {
Exception firstEx = null;
for (String pattern : patterns) {
try {
DateFormat format = getFormat(pattern);
return parse(sourceType, targetType, value, format);
}catch (Exception ex) {
if (firstEx == null) {
firstEx = ex;
}
}
}
if (patterns.length > 1) {
throw new ConversionException("Error converting '" + toString(sourceType) + "' to '" + toString(targetType)
+ "' using patterns '" + displayPatterns + "'");
} else {
throw firstEx;
}
}
/**
* Parse a String into a Calendar object using the specified
* DateFormat.
*
* @param sourceType The type of the value being converted
* @param targetType The type to convert the value to
* @param value The String date value.
* @param format The DateFormat to parse the String value.
*
* @return The converted Calendar object.
* @throws ConversionException if the String cannot be converted.
*/
private Calendar parse(Class sourceType, Class targetType, String value, DateFormat format) {
logFormat("Parsing", format);
format.setLenient(false);
ParsePosition pos = new ParsePosition(0);
Date parsedDate = format.parse(value, pos); // ignore the result (use the Calendar)
if (pos.getErrorIndex() >= 0 || pos.getIndex() != value.length() || parsedDate == null) {
String msg = "Error converting '" + toString(sourceType) + "' to '" + toString(targetType) + "'";
if (format instanceof SimpleDateFormat) {
msg += " using pattern '" + ((SimpleDateFormat) format).toPattern() + "'";
}
if (log().isDebugEnabled()) {
log().debug(" " + msg);
}
throw new ConversionException(msg);
}
return format.getCalendar();
}
/**
* Provide a String representation of this date/time converter.
*
* @return A String representation of this date/time converter
*/
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append(toString(getClass()));
buffer.append("[UseDefault=");
buffer.append(isUseDefault());
buffer.append(", UseLocaleFormat=");
buffer.append(useLocaleFormat);
if (displayPatterns != null) {
buffer.append(", Patterns={");
buffer.append(displayPatterns);
buffer.append('}');
}
if (locale != null) {
buffer.append(", Locale=");
buffer.append(locale);
}
TimeZone timeZone = timeZone();
if (timeZone != null) {
buffer.append(", TimeZone=");
buffer.append(timeZone);
}
buffer.append(']');
return buffer.toString();
}
/**
* Log the DateFormat creation.
*
* @param action The action the format is being used for
* @param format The Date format
*/
private void logFormat(String action, DateFormat format) {
if (log().isDebugEnabled()) {
StringBuilder buffer = new StringBuilder(45);
buffer.append(" ");
buffer.append(action);
buffer.append(" with Format");
if (format instanceof SimpleDateFormat) {
buffer.append("[");
buffer.append(((SimpleDateFormat) format).toPattern());
buffer.append("]");
}
buffer.append(" for ");
if (locale == null) {
buffer.append("default locale");
} else {
buffer.append("locale[");
buffer.append(locale);
buffer.append("]");
}
TimeZone timeZone = timeZone();
if (timeZone != null) {
buffer.append(", TimeZone[");
buffer.append(timeZone);
buffer.append("]");
}
log().debug(buffer.toString());
}
}
private String toString(Class type) {
StringBuilder typeName;
if (type == null) {
typeName = new StringBuilder("null");
} else if (type.isArray()) {
Class elementType = type.getComponentType();
int count = 1;
while (elementType.isArray()) {
elementType = elementType.getComponentType();
count++;
}
typeName = new StringBuilder(elementType.getName());
for (int i = 0; i < count; i++) {
typeName.append("[]");
}
} else {
typeName = new StringBuilder(type.getName());
}
if (typeName.toString().startsWith("java.lang.")
|| typeName.toString().startsWith("java.util.")
|| typeName.toString().startsWith("java.math.")) {
typeName = new StringBuilder(typeName.substring("java.lang.".length()));
} else if (typeName.toString().startsWith(PACKAGE)) {
typeName = new StringBuilder(typeName.substring(PACKAGE.length()));
}
return typeName.toString();
}
private TimeZone timeZone() {
return DataBinder.getTimeZoneForRequest();
}
}