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The HTML.java Java example source code
/*
* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.swing.text.html;
import java.io.*;
import java.util.Hashtable;
import javax.swing.text.AttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
/**
* Constants used in the <code>HTMLDocument. These
* are basically tag and attribute definitions.
*
* @author Timothy Prinzing
* @author Sunita Mani
*
*/
public class HTML {
/**
* Typesafe enumeration for an HTML tag. Although the
* set of HTML tags is a closed set, we have left the
* set open so that people can add their own tag types
* to their custom parser and still communicate to the
* reader.
*/
public static class Tag {
/** @since 1.3 */
public Tag() {}
/**
* Creates a new <code>Tag with the specified id,
* and with <code>causesBreak and isBlock
* set to <code>false.
*
* @param id the id of the new tag
*/
protected Tag(String id) {
this(id, false, false);
}
/**
* Creates a new <code>Tag with the specified id;
* <code>causesBreak and isBlock are defined
* by the user.
*
* @param id the id of the new tag
* @param causesBreak <code>true if this tag
* causes a break to the flow of data
* @param isBlock <code>true if the tag is used
* to add structure to a document
*/
protected Tag(String id, boolean causesBreak, boolean isBlock) {
name = id;
this.breakTag = causesBreak;
this.blockTag = isBlock;
}
/**
* Returns <code>true if this tag is a block
* tag, which is a tag used to add structure to a
* document.
*
* @return <code>true if this tag is a block
* tag, otherwise returns <code>false
*/
public boolean isBlock() {
return blockTag;
}
/**
* Returns <code>true if this tag causes a
* line break to the flow of data, otherwise returns
* <code>false.
*
* @return <code>true if this tag causes a
* line break to the flow of data, otherwise returns
* <code>false
*/
public boolean breaksFlow() {
return breakTag;
}
/**
* Returns <code>true if this tag is pre-formatted,
* which is true if the tag is either <code>PRE or
* <code>TEXTAREA.
*
* @return <code>true if this tag is pre-formatted,
* otherwise returns <code>false
*/
public boolean isPreformatted() {
return (this == PRE || this == TEXTAREA);
}
/**
* Returns the string representation of the
* tag.
*
* @return the <code>String representation of the tag
*/
public String toString() {
return name;
}
/**
* Returns <code>true if this tag is considered to be a paragraph
* in the internal HTML model. <code>false - otherwise.
*
* @return <code>true if this tag is considered to be a paragraph
* in the internal HTML model. <code>false - otherwise.
* @see HTMLDocument.HTMLReader.ParagraphAction
*/
boolean isParagraph() {
return (
this == P
|| this == IMPLIED
|| this == DT
|| this == H1
|| this == H2
|| this == H3
|| this == H4
|| this == H5
|| this == H6
);
}
boolean blockTag;
boolean breakTag;
String name;
boolean unknown;
// --- Tag Names -----------------------------------
public static final Tag A = new Tag("a");
public static final Tag ADDRESS = new Tag("address");
public static final Tag APPLET = new Tag("applet");
public static final Tag AREA = new Tag("area");
public static final Tag B = new Tag("b");
public static final Tag BASE = new Tag("base");
public static final Tag BASEFONT = new Tag("basefont");
public static final Tag BIG = new Tag("big");
public static final Tag BLOCKQUOTE = new Tag("blockquote", true, true);
public static final Tag BODY = new Tag("body", true, true);
public static final Tag BR = new Tag("br", true, false);
public static final Tag CAPTION = new Tag("caption");
public static final Tag CENTER = new Tag("center", true, false);
public static final Tag CITE = new Tag("cite");
public static final Tag CODE = new Tag("code");
public static final Tag DD = new Tag("dd", true, true);
public static final Tag DFN = new Tag("dfn");
public static final Tag DIR = new Tag("dir", true, true);
public static final Tag DIV = new Tag("div", true, true);
public static final Tag DL = new Tag("dl", true, true);
public static final Tag DT = new Tag("dt", true, true);
public static final Tag EM = new Tag("em");
public static final Tag FONT = new Tag("font");
public static final Tag FORM = new Tag("form", true, false);
public static final Tag FRAME = new Tag("frame");
public static final Tag FRAMESET = new Tag("frameset");
public static final Tag H1 = new Tag("h1", true, true);
public static final Tag H2 = new Tag("h2", true, true);
public static final Tag H3 = new Tag("h3", true, true);
public static final Tag H4 = new Tag("h4", true, true);
public static final Tag H5 = new Tag("h5", true, true);
public static final Tag H6 = new Tag("h6", true, true);
public static final Tag HEAD = new Tag("head", true, true);
public static final Tag HR = new Tag("hr", true, false);
public static final Tag HTML = new Tag("html", true, false);
public static final Tag I = new Tag("i");
public static final Tag IMG = new Tag("img");
public static final Tag INPUT = new Tag("input");
public static final Tag ISINDEX = new Tag("isindex", true, false);
public static final Tag KBD = new Tag("kbd");
public static final Tag LI = new Tag("li", true, true);
public static final Tag LINK = new Tag("link");
public static final Tag MAP = new Tag("map");
public static final Tag MENU = new Tag("menu", true, true);
public static final Tag META = new Tag("meta");
/*public*/ static final Tag NOBR = new Tag("nobr");
public static final Tag NOFRAMES = new Tag("noframes", true, true);
public static final Tag OBJECT = new Tag("object");
public static final Tag OL = new Tag("ol", true, true);
public static final Tag OPTION = new Tag("option");
public static final Tag P = new Tag("p", true, true);
public static final Tag PARAM = new Tag("param");
public static final Tag PRE = new Tag("pre", true, true);
public static final Tag SAMP = new Tag("samp");
public static final Tag SCRIPT = new Tag("script");
public static final Tag SELECT = new Tag("select");
public static final Tag SMALL = new Tag("small");
public static final Tag SPAN = new Tag("span");
public static final Tag STRIKE = new Tag("strike");
public static final Tag S = new Tag("s");
public static final Tag STRONG = new Tag("strong");
public static final Tag STYLE = new Tag("style");
public static final Tag SUB = new Tag("sub");
public static final Tag SUP = new Tag("sup");
public static final Tag TABLE = new Tag("table", false, true);
public static final Tag TD = new Tag("td", true, true);
public static final Tag TEXTAREA = new Tag("textarea");
public static final Tag TH = new Tag("th", true, true);
public static final Tag TITLE = new Tag("title", true, true);
public static final Tag TR = new Tag("tr", false, true);
public static final Tag TT = new Tag("tt");
public static final Tag U = new Tag("u");
public static final Tag UL = new Tag("ul", true, true);
public static final Tag VAR = new Tag("var");
/**
* All text content must be in a paragraph element.
* If a paragraph didn't exist when content was
* encountered, a paragraph is manufactured.
* <p>
* This is a tag synthesized by the HTML reader.
* Since elements are identified by their tag type,
* we create a some fake tag types to mark the elements
* that were manufactured.
*/
public static final Tag IMPLIED = new Tag("p-implied");
/**
* All text content is labeled with this tag.
* <p>
* This is a tag synthesized by the HTML reader.
* Since elements are identified by their tag type,
* we create a some fake tag types to mark the elements
* that were manufactured.
*/
public static final Tag CONTENT = new Tag("content");
/**
* All comments are labeled with this tag.
* <p>
* This is a tag synthesized by the HTML reader.
* Since elements are identified by their tag type,
* we create a some fake tag types to mark the elements
* that were manufactured.
*/
public static final Tag COMMENT = new Tag("comment");
static final Tag allTags[] = {
A, ADDRESS, APPLET, AREA, B, BASE, BASEFONT, BIG,
BLOCKQUOTE, BODY, BR, CAPTION, CENTER, CITE, CODE,
DD, DFN, DIR, DIV, DL, DT, EM, FONT, FORM, FRAME,
FRAMESET, H1, H2, H3, H4, H5, H6, HEAD, HR, HTML,
I, IMG, INPUT, ISINDEX, KBD, LI, LINK, MAP, MENU,
META, NOBR, NOFRAMES, OBJECT, OL, OPTION, P, PARAM,
PRE, SAMP, SCRIPT, SELECT, SMALL, SPAN, STRIKE, S,
STRONG, STYLE, SUB, SUP, TABLE, TD, TEXTAREA,
TH, TITLE, TR, TT, U, UL, VAR
};
static {
// Force HTMLs static initialize to be loaded.
getTag("html");
}
}
// There is no unique instance of UnknownTag, so we allow it to be
// Serializable.
public static class UnknownTag extends Tag implements Serializable {
/**
* Creates a new <code>UnknownTag with the specified
* <code>id.
* @param id the id of the new tag
*/
public UnknownTag(String id) {
super(id);
}
/**
* Returns the hash code which corresponds to the string
* for this tag.
*/
public int hashCode() {
return toString().hashCode();
}
/**
* Compares this object to the specified object.
* The result is <code>true if and only if the argument is not
* <code>null and is an UnknownTag object
* with the same name.
*
* @param obj the object to compare this tag with
* @return <code>true if the objects are equal;
* <code>false otherwise
*/
public boolean equals(Object obj) {
if (obj instanceof UnknownTag) {
return toString().equals(obj.toString());
}
return false;
}
private void writeObject(java.io.ObjectOutputStream s)
throws IOException {
s.defaultWriteObject();
s.writeBoolean(blockTag);
s.writeBoolean(breakTag);
s.writeBoolean(unknown);
s.writeObject(name);
}
private void readObject(ObjectInputStream s)
throws ClassNotFoundException, IOException {
s.defaultReadObject();
blockTag = s.readBoolean();
breakTag = s.readBoolean();
unknown = s.readBoolean();
name = (String)s.readObject();
}
}
/**
* Typesafe enumeration representing an HTML
* attribute.
*/
public static final class Attribute {
/**
* Creates a new <code>Attribute with the specified
* <code>id.
*
* @param id the id of the new <code>Attribute
*/
Attribute(String id) {
name = id;
}
/**
* Returns the string representation of this attribute.
* @return the string representation of this attribute
*/
public String toString() {
return name;
}
private String name;
public static final Attribute SIZE = new Attribute("size");
public static final Attribute COLOR = new Attribute("color");
public static final Attribute CLEAR = new Attribute("clear");
public static final Attribute BACKGROUND = new Attribute("background");
public static final Attribute BGCOLOR = new Attribute("bgcolor");
public static final Attribute TEXT = new Attribute("text");
public static final Attribute LINK = new Attribute("link");
public static final Attribute VLINK = new Attribute("vlink");
public static final Attribute ALINK = new Attribute("alink");
public static final Attribute WIDTH = new Attribute("width");
public static final Attribute HEIGHT = new Attribute("height");
public static final Attribute ALIGN = new Attribute("align");
public static final Attribute NAME = new Attribute("name");
public static final Attribute HREF = new Attribute("href");
public static final Attribute REL = new Attribute("rel");
public static final Attribute REV = new Attribute("rev");
public static final Attribute TITLE = new Attribute("title");
public static final Attribute TARGET = new Attribute("target");
public static final Attribute SHAPE = new Attribute("shape");
public static final Attribute COORDS = new Attribute("coords");
public static final Attribute ISMAP = new Attribute("ismap");
public static final Attribute NOHREF = new Attribute("nohref");
public static final Attribute ALT = new Attribute("alt");
public static final Attribute ID = new Attribute("id");
public static final Attribute SRC = new Attribute("src");
public static final Attribute HSPACE = new Attribute("hspace");
public static final Attribute VSPACE = new Attribute("vspace");
public static final Attribute USEMAP = new Attribute("usemap");
public static final Attribute LOWSRC = new Attribute("lowsrc");
public static final Attribute CODEBASE = new Attribute("codebase");
public static final Attribute CODE = new Attribute("code");
public static final Attribute ARCHIVE = new Attribute("archive");
public static final Attribute VALUE = new Attribute("value");
public static final Attribute VALUETYPE = new Attribute("valuetype");
public static final Attribute TYPE = new Attribute("type");
public static final Attribute CLASS = new Attribute("class");
public static final Attribute STYLE = new Attribute("style");
public static final Attribute LANG = new Attribute("lang");
public static final Attribute FACE = new Attribute("face");
public static final Attribute DIR = new Attribute("dir");
public static final Attribute DECLARE = new Attribute("declare");
public static final Attribute CLASSID = new Attribute("classid");
public static final Attribute DATA = new Attribute("data");
public static final Attribute CODETYPE = new Attribute("codetype");
public static final Attribute STANDBY = new Attribute("standby");
public static final Attribute BORDER = new Attribute("border");
public static final Attribute SHAPES = new Attribute("shapes");
public static final Attribute NOSHADE = new Attribute("noshade");
public static final Attribute COMPACT = new Attribute("compact");
public static final Attribute START = new Attribute("start");
public static final Attribute ACTION = new Attribute("action");
public static final Attribute METHOD = new Attribute("method");
public static final Attribute ENCTYPE = new Attribute("enctype");
public static final Attribute CHECKED = new Attribute("checked");
public static final Attribute MAXLENGTH = new Attribute("maxlength");
public static final Attribute MULTIPLE = new Attribute("multiple");
public static final Attribute SELECTED = new Attribute("selected");
public static final Attribute ROWS = new Attribute("rows");
public static final Attribute COLS = new Attribute("cols");
public static final Attribute DUMMY = new Attribute("dummy");
public static final Attribute CELLSPACING = new Attribute("cellspacing");
public static final Attribute CELLPADDING = new Attribute("cellpadding");
public static final Attribute VALIGN = new Attribute("valign");
public static final Attribute HALIGN = new Attribute("halign");
public static final Attribute NOWRAP = new Attribute("nowrap");
public static final Attribute ROWSPAN = new Attribute("rowspan");
public static final Attribute COLSPAN = new Attribute("colspan");
public static final Attribute PROMPT = new Attribute("prompt");
public static final Attribute HTTPEQUIV = new Attribute("http-equiv");
public static final Attribute CONTENT = new Attribute("content");
public static final Attribute LANGUAGE = new Attribute("language");
public static final Attribute VERSION = new Attribute("version");
public static final Attribute N = new Attribute("n");
public static final Attribute FRAMEBORDER = new Attribute("frameborder");
public static final Attribute MARGINWIDTH = new Attribute("marginwidth");
public static final Attribute MARGINHEIGHT = new Attribute("marginheight");
public static final Attribute SCROLLING = new Attribute("scrolling");
public static final Attribute NORESIZE = new Attribute("noresize");
public static final Attribute ENDTAG = new Attribute("endtag");
public static final Attribute COMMENT = new Attribute("comment");
static final Attribute MEDIA = new Attribute("media");
static final Attribute allAttributes[] = {
FACE,
COMMENT,
SIZE,
COLOR,
CLEAR,
BACKGROUND,
BGCOLOR,
TEXT,
LINK,
VLINK,
ALINK,
WIDTH,
HEIGHT,
ALIGN,
NAME,
HREF,
REL,
REV,
TITLE,
TARGET,
SHAPE,
COORDS,
ISMAP,
NOHREF,
ALT,
ID,
SRC,
HSPACE,
VSPACE,
USEMAP,
LOWSRC,
CODEBASE,
CODE,
ARCHIVE,
VALUE,
VALUETYPE,
TYPE,
CLASS,
STYLE,
LANG,
DIR,
DECLARE,
CLASSID,
DATA,
CODETYPE,
STANDBY,
BORDER,
SHAPES,
NOSHADE,
COMPACT,
START,
ACTION,
METHOD,
ENCTYPE,
CHECKED,
MAXLENGTH,
MULTIPLE,
SELECTED,
ROWS,
COLS,
DUMMY,
CELLSPACING,
CELLPADDING,
VALIGN,
HALIGN,
NOWRAP,
ROWSPAN,
COLSPAN,
PROMPT,
HTTPEQUIV,
CONTENT,
LANGUAGE,
VERSION,
N,
FRAMEBORDER,
MARGINWIDTH,
MARGINHEIGHT,
SCROLLING,
NORESIZE,
MEDIA,
ENDTAG
};
}
// The secret to 73, is that, given that the Hashtable contents
// never change once the static initialization happens, the initial size
// that the hashtable grew to was determined, and then that very size
// is used.
//
private static final Hashtable<String, Tag> tagHashtable = new Hashtable(73);
/** Maps from StyleConstant key to HTML.Tag. */
private static final Hashtable<Object, Tag> scMapping = new Hashtable(8);
static {
for (int i = 0; i < Tag.allTags.length; i++ ) {
tagHashtable.put(Tag.allTags[i].toString(), Tag.allTags[i]);
StyleContext.registerStaticAttributeKey(Tag.allTags[i]);
}
StyleContext.registerStaticAttributeKey(Tag.IMPLIED);
StyleContext.registerStaticAttributeKey(Tag.CONTENT);
StyleContext.registerStaticAttributeKey(Tag.COMMENT);
for (int i = 0; i < Attribute.allAttributes.length; i++) {
StyleContext.registerStaticAttributeKey(Attribute.
allAttributes[i]);
}
StyleContext.registerStaticAttributeKey(HTML.NULL_ATTRIBUTE_VALUE);
scMapping.put(StyleConstants.Bold, Tag.B);
scMapping.put(StyleConstants.Italic, Tag.I);
scMapping.put(StyleConstants.Underline, Tag.U);
scMapping.put(StyleConstants.StrikeThrough, Tag.STRIKE);
scMapping.put(StyleConstants.Superscript, Tag.SUP);
scMapping.put(StyleConstants.Subscript, Tag.SUB);
scMapping.put(StyleConstants.FontFamily, Tag.FONT);
scMapping.put(StyleConstants.FontSize, Tag.FONT);
}
/**
* Returns the set of actual HTML tags that
* are recognized by the default HTML reader.
* This set does not include tags that are
* manufactured by the reader.
*/
public static Tag[] getAllTags() {
Tag[] tags = new Tag[Tag.allTags.length];
System.arraycopy(Tag.allTags, 0, tags, 0, Tag.allTags.length);
return tags;
}
/**
* Fetches a tag constant for a well-known tag name (i.e. one of
* the tags in the set {A, ADDRESS, APPLET, AREA, B,
* BASE, BASEFONT, BIG,
* BLOCKQUOTE, BODY, BR, CAPTION, CENTER, CITE, CODE,
* DD, DFN, DIR, DIV, DL, DT, EM, FONT, FORM, FRAME,
* FRAMESET, H1, H2, H3, H4, H5, H6, HEAD, HR, HTML,
* I, IMG, INPUT, ISINDEX, KBD, LI, LINK, MAP, MENU,
* META, NOBR, NOFRAMES, OBJECT, OL, OPTION, P, PARAM,
* PRE, SAMP, SCRIPT, SELECT, SMALL, SPAN, STRIKE, S,
* STRONG, STYLE, SUB, SUP, TABLE, TD, TEXTAREA,
* TH, TITLE, TR, TT, U, UL, VAR}. If the given
* name does not represent one of the well-known tags, then
* <code>null will be returned.
*
* @param tagName the <code>String name requested
* @return a tag constant corresponding to the <code>tagName,
* or <code>null if not found
*/
public static Tag getTag(String tagName) {
Tag t = tagHashtable.get(tagName);
return (t == null ? null : t);
}
/**
* Returns the HTML <code>Tag associated with the
* <code>StyleConstants key sc.
* If no matching <code>Tag is found, returns
* <code>null.
*
* @param sc the <code>StyleConstants key
* @return tag which corresponds to <code>sc, or
* <code>null if not found
*/
static Tag getTagForStyleConstantsKey(StyleConstants sc) {
return scMapping.get(sc);
}
/**
* Fetches an integer attribute value. Attribute values
* are stored as a string, and this is a convenience method
* to convert to an actual integer.
*
* @param attr the set of attributes to use to try to fetch a value
* @param key the key to use to fetch the value
* @param def the default value to use if the attribute isn't
* defined or there is an error converting to an integer
*/
public static int getIntegerAttributeValue(AttributeSet attr,
Attribute key, int def) {
int value = def;
String istr = (String) attr.getAttribute(key);
if (istr != null) {
try {
value = Integer.valueOf(istr).intValue();
} catch (NumberFormatException e) {
value = def;
}
}
return value;
}
// This is used in cases where the value for the attribute has not
// been specified.
//
public static final String NULL_ATTRIBUTE_VALUE = "#DEFAULT";
// size determined similar to size of tagHashtable
private static final Hashtable<String, Attribute> attHashtable = new Hashtable(77);
static {
for (int i = 0; i < Attribute.allAttributes.length; i++ ) {
attHashtable.put(Attribute.allAttributes[i].toString(), Attribute.allAttributes[i]);
}
}
/**
* Returns the set of HTML attributes recognized.
* @return the set of HTML attributes recognized
*/
public static Attribute[] getAllAttributeKeys() {
Attribute[] attributes = new Attribute[Attribute.allAttributes.length];
System.arraycopy(Attribute.allAttributes, 0,
attributes, 0, Attribute.allAttributes.length);
return attributes;
}
/**
* Fetches an attribute constant for a well-known attribute name
* (i.e. one of the attributes in the set {FACE, COMMENT, SIZE,
* COLOR, CLEAR, BACKGROUND, BGCOLOR, TEXT, LINK, VLINK, ALINK,
* WIDTH, HEIGHT, ALIGN, NAME, HREF, REL, REV, TITLE, TARGET,
* SHAPE, COORDS, ISMAP, NOHREF, ALT, ID, SRC, HSPACE, VSPACE,
* USEMAP, LOWSRC, CODEBASE, CODE, ARCHIVE, VALUE, VALUETYPE,
* TYPE, CLASS, STYLE, LANG, DIR, DECLARE, CLASSID, DATA, CODETYPE,
* STANDBY, BORDER, SHAPES, NOSHADE, COMPACT, START, ACTION, METHOD,
* ENCTYPE, CHECKED, MAXLENGTH, MULTIPLE, SELECTED, ROWS, COLS,
* DUMMY, CELLSPACING, CELLPADDING, VALIGN, HALIGN, NOWRAP, ROWSPAN,
* COLSPAN, PROMPT, HTTPEQUIV, CONTENT, LANGUAGE, VERSION, N,
* FRAMEBORDER, MARGINWIDTH, MARGINHEIGHT, SCROLLING, NORESIZE,
* MEDIA, ENDTAG}).
* If the given name does not represent one of the well-known attributes,
* then <code>null will be returned.
*
* @param attName the <code>String requested
* @return the <code>Attribute corresponding to attName
*/
public static Attribute getAttributeKey(String attName) {
Attribute a = attHashtable.get(attName);
if (a == null) {
return null;
}
return a;
}
}
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