📄 htmlheadersectionhandler.java
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/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.apache.wicket.markup.parser.filter;import java.text.ParseException;import org.apache.wicket.markup.ComponentTag;import org.apache.wicket.markup.Markup;import org.apache.wicket.markup.MarkupElement;import org.apache.wicket.markup.parser.AbstractMarkupFilter;import org.apache.wicket.markup.parser.XmlTag;/** * This is a markup inline filter. It assumes that WicketTagIdentifier has been called first and * search for a <head> tag (note: not wicket:head). Provided the markup contains a * <body> tag it will automatically prepend a <head> tag if missing. * <p> * Note: This handler is only relevant for Pages (see MarkupParser.newFilterChain()) * * @see org.apache.wicket.markup.MarkupParser * @author Juergen Donnerstag */public final class HtmlHeaderSectionHandler extends AbstractMarkupFilter{ private static final String BODY = "body"; private static final String HEAD = "head"; /** The automatically assigned wicket:id to >head< tag */ public static final String HEADER_ID = "_header_"; /** True if <head> has been found already */ private boolean foundHead = false; /** True if all the rest of the markup file can be ignored */ private boolean ignoreTheRest = false; /** The Markup available so far for the resource */ private final Markup markup; /** * Construct. * * @param markup * The Markup object being filled while reading the markup resource */ public HtmlHeaderSectionHandler(final Markup markup) { this.markup = markup; } /** * Get the next tag from the next MarkupFilter in the chain and search for Wicket specific tags. * <p> * * @see org.apache.wicket.markup.parser.IMarkupFilter#nextTag() * @return The next tag from markup to be processed. If null, no more tags are available */ public MarkupElement nextTag() throws ParseException { // Get the next tag from the markup. // If null, no more tags are available final ComponentTag tag = nextComponentTag(); if (tag == null) { return tag; } // Whatever there is left in the markup, ignore it if (ignoreTheRest == true) { return tag; } // if it is <head> or </head> if (HEAD.equalsIgnoreCase(tag.getName())) { if (tag.getNamespace() == null) { // we found <head> if (tag.isClose()) { foundHead = true; } else if (tag.getId() == null) { tag.setId(HEADER_ID); tag.setAutoComponentTag(true); tag.setModified(true); } return tag; } else { // we found <wicket:head> foundHead = true; } } else if (BODY.equalsIgnoreCase(tag.getName()) && (tag.getNamespace() == null)) { // We found <body> if (foundHead == false) { insertHeadTag(); } // <head> must always be before <body> ignoreTheRest = true; return tag; } return tag; } /** * Insert <head> open and close tag (with empty body) to the current position. */ private void insertHeadTag() { // Note: only the open-tag must be a AutoComponentTag final ComponentTag openTag = new ComponentTag(HEAD, XmlTag.OPEN); openTag.setId(HEADER_ID); openTag.setAutoComponentTag(true); openTag.setModified(true); final ComponentTag closeTag = new ComponentTag(HEAD, XmlTag.CLOSE); closeTag.setOpenTag(openTag); closeTag.setModified(true); // insert the tags into the markup stream markup.addMarkupElement(openTag); markup.addMarkupElement(closeTag); }}⌨️ 快捷键说明
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