001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.markup.head;
018
019import java.util.Arrays;
020import java.util.Collections;
021import java.util.Objects;
022
023import org.apache.wicket.core.util.string.CssUtils;
024import org.apache.wicket.request.Response;
025import org.apache.wicket.util.string.Strings;
026import org.apache.wicket.util.value.AttributeMap;
027
028/**
029 * {@link HeaderItem} for internal (embedded in the header) css content.
030 * 
031 * @author papegaaij
032 */
033public class CssContentHeaderItem extends CssHeaderItem
034{
035        private static final long serialVersionUID = 1L;
036
037        private final CharSequence css;
038
039        /**
040         * Creates a new {@code CSSContentHeaderItem}.
041         * 
042         * @param css
043         *            css content to be rendered.
044         * @param id
045         *            unique id for the &lt;style&gt; element. This can be <code>null</code>, however in
046         *            that case the ajax header contribution can't detect duplicate CSS fragments.
047         */
048        public CssContentHeaderItem(CharSequence css, String id)
049        {
050                this.css = css;
051                setId(id);
052        }
053
054        /**
055         * @return the css content to be rendered.
056         */
057        public CharSequence getCss()
058        {
059                return css;
060        }
061
062        @Override
063        public void render(Response response)
064        {
065                AttributeMap attributes = new AttributeMap();
066                attributes.putAttribute(CssUtils.ATTR_ID, getId());
067                attributes.putAttribute(CssUtils.ATTR_CSP_NONCE, getNonce());
068                CssUtils.writeInlineStyle(response, getCss(), attributes);
069        }
070
071        @Override
072        public Iterable<?> getRenderTokens()
073        {
074                if (Strings.isEmpty(getId()))
075                        return Collections.singletonList(getCss());
076                return Arrays.asList(getId(), getCss());
077        }
078
079        @Override
080        public String toString()
081        {
082                return "CSSHeaderItem(" + getCss() + ")";
083        }
084
085        @Override
086        public boolean equals(Object o)
087        {
088                if (this == o)
089                        return true;
090                if (o == null || getClass() != o.getClass())
091                        return false;
092                CssContentHeaderItem that = (CssContentHeaderItem)o;
093                return Objects.equals(css, that.css);
094        }
095
096        @Override
097        public int hashCode()
098        {
099                return Objects.hash(css);
100        }
101}