io.undertow.attribute.DateTimeAttribute Maven / Gradle / Ivy
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* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.undertow.attribute;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.DateUtils;
/**
* The current time
*
* @author Stuart Douglas
*/
public class DateTimeAttribute implements ExchangeAttribute {
public static final String DATE_TIME_SHORT = "%t";
public static final String DATE_TIME = "%{DATE_TIME}";
public static final String CUSTOM_TIME = "%{time,";
public static final ExchangeAttribute INSTANCE = new DateTimeAttribute();
private final String dateFormat;
private final ThreadLocal cachedFormat;
private DateTimeAttribute() {
this.dateFormat = null;
this.cachedFormat = null;
}
public DateTimeAttribute(final String dateFormat) {
this(dateFormat, null);
}
public DateTimeAttribute(final String dateFormat, final String timezone) {
this.dateFormat = dateFormat;
this.cachedFormat = new ThreadLocal() {
@Override
protected SimpleDateFormat initialValue() {
final SimpleDateFormat format = new SimpleDateFormat(dateFormat);
if(timezone != null) {
format.setTimeZone(TimeZone.getTimeZone(timezone));
}
return format;
}
};
}
@Override
public String readAttribute(final HttpServerExchange exchange) {
if(dateFormat == null) {
return DateUtils.toCommonLogFormat(new Date());
} else {
final SimpleDateFormat dateFormat = this.cachedFormat.get();
return dateFormat.format(new Date());
}
}
@Override
public void writeAttribute(final HttpServerExchange exchange, final String newValue) throws ReadOnlyAttributeException {
throw new ReadOnlyAttributeException("Date time", newValue);
}
public static final class Builder implements ExchangeAttributeBuilder {
@Override
public String name() {
return "Date Time";
}
@Override
public ExchangeAttribute build(final String token) {
if (token.equals(DATE_TIME) || token.equals(DATE_TIME_SHORT)) {
return DateTimeAttribute.INSTANCE;
}
if(token.startsWith(CUSTOM_TIME) && token.endsWith("}")) {
return new DateTimeAttribute(token.substring(CUSTOM_TIME.length(), token.length() - 1));
}
return null;
}
@Override
public int priority() {
return 0;
}
}
}