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.JavaScriptUtils;
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) javascript content.
030 * 
031 * @author papegaaij
032 */
033public class JavaScriptContentHeaderItem extends JavaScriptHeaderItem
034{
035        private final CharSequence javaScript;
036
037        /**
038         * Creates a new {@code JavaScriptContentHeaderItem}.
039         * 
040         * @param javaScript
041         *            javascript content to be rendered.
042         * @param id
043         *            unique id for the javascript element. This can be null, however in that case the
044         *            ajax header contribution can't detect duplicate script fragments.
045         */
046        public JavaScriptContentHeaderItem(CharSequence javaScript, String id)
047        {
048                this.javaScript = javaScript;
049                setId(id);
050        }
051
052        /**
053         * @return javascript content to be rendered.
054         */
055        public CharSequence getJavaScript()
056        {
057                return javaScript;
058        }
059
060        @Override
061        public void render(Response response)
062        {
063                AttributeMap attributes = new AttributeMap();
064                attributes.putAttribute(JavaScriptUtils.ATTR_TYPE, "text/javascript");
065                attributes.putAttribute(JavaScriptUtils.ATTR_ID, getId());
066                attributes.putAttribute(JavaScriptUtils.ATTR_CSP_NONCE, getNonce());
067                JavaScriptUtils.writeInlineScript(response, getJavaScript(), attributes);
068        }
069
070        @Override
071        public Iterable<?> getRenderTokens()
072        {
073                if (Strings.isEmpty(getId()))
074                        return Collections.singletonList(getJavaScript());
075                return Arrays.asList(getId(), getJavaScript());
076        }
077
078        @Override
079        public String toString()
080        {
081                return "JavaScriptHeaderItem(" + getJavaScript() + ")";
082        }
083
084        @Override
085        public boolean equals(Object o)
086        {
087                if (this == o) return true;
088                if (o == null || getClass() != o.getClass()) return false;
089                if (!super.equals(o)) return false;
090                JavaScriptContentHeaderItem that = (JavaScriptContentHeaderItem) o;
091                return Objects.equals(javaScript, that.javaScript);
092        }
093
094        @Override
095        public int hashCode()
096        {
097                // Not using `Objects.hash` for performance reasons
098                int result = super.hashCode();
099                result = 31 * result + ((javaScript != null) ? javaScript.hashCode() : 0);
100                return result;
101        }
102}