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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.tika.parser.html;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* The default HTML mapping rules in Tika.
*
* @since Apache Tika 0.6
*/
@SuppressWarnings("serial")
public class DefaultHtmlMapper implements HtmlMapper {
// Based on http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd
private static final Map SAFE_ELEMENTS = new HashMap() {{
put("H1", "h1");
put("H2", "h2");
put("H3", "h3");
put("H4", "h4");
put("H5", "h5");
put("H6", "h6");
put("P", "p");
put("PRE", "pre");
put("BLOCKQUOTE", "blockquote");
put("Q", "q");
put("UL", "ul");
put("OL", "ol");
put("MENU", "ul");
put("LI", "li");
put("DL", "dl");
put("DT", "dt");
put("DD", "dd");
put("TABLE", "table");
put("THEAD", "thead");
put("TBODY", "tbody");
put("TR", "tr");
put("TH", "th");
put("TD", "td");
put("ADDRESS", "address");
// TIKA-460 - add anchors
put("A", "a");
// TIKA-463 - add additional elements that contain URLs (and their sub-elements)
put("MAP", "map");
put("AREA", "area");
put("IMG", "img");
put("FRAMESET", "frameset");
put("FRAME", "frame");
put("IFRAME", "iframe");
put("OBJECT", "object");
put("PARAM", "param");
put("INS", "ins");
put("DEL", "del");
}};
private static final Set DISCARDABLE_ELEMENTS = new HashSet() {{
add("STYLE");
add("SCRIPT");
}};
// For information on tags & attributes, see:
// http://www.w3.org/TR/2002/REC-xhtml1-20020801/dtds.html#a_dtd_XHTML-1.0-Strict
// http://www.w3schools.com/TAGS/
private static final Map> SAFE_ATTRIBUTES = new HashMap>() {{
put("a", attrSet("charset", "type", "name", "href", "hreflang", "rel", "rev", "shape", "coords"));
put("img", attrSet("src", "alt", "longdesc", "height", "width", "usemap", "ismap"));
put("frame", attrSet("longdesc", "name", "src", "frameborder", "marginwidth", "marginheight", "noresize", "scrolling"));
put("iframe", attrSet("longdesc", "name", "src", "frameborder", "marginwidth", "marginheight", "scrolling", "align", "height", "width"));
put("link", attrSet("charset", "href", "hreflang", "type", "rel", "rev", "media"));
put("map", attrSet("id", "class", "style", "title", "name"));
put("area", attrSet("shape", "coords", "href", "nohref", "alt"));
put("object", attrSet("declare", "classid", "codebase", "data", "type", "codetype", "archive", "standby", "height",
"width", "usemap", "name", "tabindex", "align", "border", "hspace", "vspace"));
put("param", attrSet("id", "name", "value", "valuetype", "type"));
put("blockquote", attrSet("cite"));
put("ins", attrSet("cite", "datetime"));
put("del", attrSet("cite", "datetime"));
put("q", attrSet("cite"));
// TODO - fill out this set. Include core, i18n, etc sets where appropriate.
}};
private static Set attrSet(String... attrs) {
Set result = new HashSet();
for (String attr : attrs) {
result.add(attr);
}
return result;
}
/**
* @since Apache Tika 0.8
*/
public static final HtmlMapper INSTANCE = new DefaultHtmlMapper();
public String mapSafeElement(String name) {
return SAFE_ELEMENTS.get(name);
}
/** Normalizes an attribute name. Assumes that the element name
* is valid and normalized
*/
public String mapSafeAttribute(String elementName, String attributeName) {
Set safeAttrs = SAFE_ATTRIBUTES.get(elementName);
if ((safeAttrs != null) && safeAttrs.contains(attributeName)) {
return attributeName;
} else {
return null;
}
}
public boolean isDiscardElement(String name) {
return DISCARDABLE_ELEMENTS.contains(name);
}
}
