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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
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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
/** * 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<SimpleDateFormat> 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<SimpleDateFormat>() { @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; } } }