Java example source code file (HTMLWriter.java)
The HTMLWriter.java Java example source code
/*
* Copyright (c) 1996,2010, 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.
*
* 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.
*/
import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.io.Writer;
import java.net.URL;
import java.text.MessageFormat;
import java.util.ResourceBundle;
/**
* A class to facilitate writing HTML via a stream.
*/
public class HTMLWriter
{
/**
* Create an HTMLWriter object, using a default doctype for HTML 3.2.
* @param out a Writer to which to write the generated HTML
* @throws IOException if there is a problem writing to the underlying stream
*/
public HTMLWriter(Writer out) throws IOException {
this(out, "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2//EN\">");
}
/**
* Create an HTMLWriter object, using a specifed doctype header.
* @param out a Writer to which to write the generated HTML
* @param docType a string containing a doctype header for the HTML to be generetaed
* @throws IOException if there is a problem writing to the underlying stream
*/
public HTMLWriter(Writer out, String docType) throws IOException {
if (out instanceof BufferedWriter)
this.out = (BufferedWriter) out;
else
this.out = new BufferedWriter(out);
this.out.write(docType);
this.out.newLine();
}
/**
* Create an HTMLWriter object, using a specified bundle for localizing messages.
* @param out a Writer to which to write the generated HTML
* @param i18n a resource bundle to use to localize messages
* @throws IOException if there is a problem writing to the underlying stream
*/
public HTMLWriter(Writer out, ResourceBundle i18n) throws IOException {
this(out);
this.i18n = i18n;
}
/**
* Create an HTMLWriter object, using a specifed doctype header and
* using a specified bundle for l0calizing messages.
* @param out a Writer to which to write the generated HTML
* @param docType a string containing a doctype header for the HTML to be generetaed
* @param i18n a resource bundle to use to localize messages
* @throws IOException if there is a problem writing to the underlying stream
*/
public HTMLWriter(Writer out, String docType, ResourceBundle i18n) throws IOException {
this(out, docType);
this.i18n = i18n;
}
/**
* Set the reource bundle to be used for localizing messages.
* @param i18n the resource bundle to be used for localizing messages
*/
public void setResourceBundle(ResourceBundle i18n) {
this.i18n = i18n;
}
/**
* Flush the stream, and the underlying output stream.
* @throws IOException if there is a problem writing to the underlying stream
*/
public void flush() throws IOException {
out.flush();
}
/**
* Close the stream, and the underlying output stream.
* @throws IOException if there is a problem closing the underlying stream
*/
public void close() throws IOException {
out.close();
}
/**
* Write a newline to the underlying output stream.
* @throws IOException if there is a problem writing to the underlying stream
*/
public void newLine() throws IOException {
out.newLine();
}
/**
* Start an HTML tag. If a prior tag has been started, it will
* be closed first. Once a tag has been opened, attributes for the
* tag may be written out, followed by body content before finally
* ending the tag.
* @param tag the tag to be started
* @throws IOException if there is a problem writing to the underlying stream
* @see #writeAttr
* @see #write
* @see #endTag
*/
public void startTag(String tag) throws IOException {
if (state == IN_TAG) {
out.write(">");
state = IN_BODY;
}
//newLine();
out.write("<");
out.write(tag);
state = IN_TAG;
}
/**
* Finish an HTML tag. It is expected that a call to endTag will match
* a corresponding earlier call to startTag, but there is no formal check
* for this.
* @param tag the tag to be closed.
* @throws IOException if there is a problem writing to the underlying stream
*/
public void endTag(String tag) throws IOException {
if (state == IN_TAG) {
out.write(">");
state = IN_BODY;
out.newLine();
}
out.write("</");
out.write(tag);
out.write(">");
//out.newLine(); // PATCHED, jjg
state = IN_BODY;
}
/**
* Finish an empty element tag, such as a META, BASE or LINK tag.
* This is expected to correspond with a startTag.
* @param tag the tag which is being closed. this is only useful for
* validation, it is not written out
* @throws IllegalStateException if this call does not follow startTag
* (stream is not currently inside a tag)
* @throws IOException if there is a problem writing to the underlying stream
*/
public void endEmptyTag(String tag) throws IOException {
if (state != IN_TAG)
throw new IllegalStateException();
out.write(">");
state = IN_BODY;
out.newLine();
}
/**
* Write an attribute for a tag. A tag must previously have been started.
* All tag attributes must be written before any body text is written.
* The value will be quoted if necessary when writing it to the underlying
* stream. No check is made that the attribute is valid for the current tag.
* @param name the name of the attribute to be written
* @param value the value of the attribute to be written
* @throws IllegalStateException if the stream is not in a state to
* write attributes -- e.g. if this call does not follow startTag or other
* calls of writteAttr
* @throws IOException if there is a problem writing to the underlying stream
*/
public void writeAttr(String name, String value) throws IOException {
if (state != IN_TAG)
throw new IllegalStateException();
out.write(" ");
out.write(name);
out.write("=");
boolean alpha = true;
for (int i = 0; i < value.length() && alpha; i++)
alpha = Character.isLetter(value.charAt(i));
if (!alpha)
out.write("\"");
out.write(value);
if (!alpha)
out.write("\"");
}
/**
* Write an attribute for a tag. A tag must previously have been started.
* All tag attributes must be written before any body text is written.
* The value will be quoted if necessary when writing it to the underlying
* stream. No check is made that the attribute is valid for the current tag.
* @param name the name of the attribute to be written
* @param value the value of the attribute to be written
* @throws IllegalStateException if the stream is not in a state to
* write attributes -- e.g. if this call does not follow startTag or other
* calls of writteAttr
* @throws IOException if there is a problem writing to the underlying stream
*/
public void writeAttr(String name, int value) throws IOException {
writeAttr(name, Integer.toString(value));
}
/**
* Write a line of text, followed by a newline.
* The text will be escaped as necessary.
* @param text the text to be written.
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeLine(String text) throws IOException {
write(text);
out.newLine();
}
/**
* Write body text, escaping it as necessary.
* If this call follows a call of startTag, the open tag will be
* closed -- meaning that no more attributes can be written until another
* tag is started. If the text value is null, the current tag will still
* be closed, but no other text will be written.
* @param text the text to be written, may be null or zero length.
* @throws IOException if there is a problem writing to the underlying stream
*/
public void write(String text) throws IOException {
if (state == IN_TAG) {
out.write(">");
state = IN_BODY;
}
if (text == null)
return;
// check to see if there are any special characters
boolean specialChars = false;
for (int i = 0; i < text.length() && !specialChars; i++) {
switch (text.charAt(i)) {
case '<': case '>': case '&':
specialChars = true;
}
}
// if there are special characters write the string character at a time;
// otherwise, write it out as is
if (specialChars) {
for (int i = 0; i < text.length(); i++) {
char c = text.charAt(i);
switch (c) {
case '<': out.write("<"); break;
case '>': out.write(">"); break;
case '&': out.write("&"); break;
default: out.write(c);
}
}
}
else
out.write(text);
}
/**
* Write a basic HTML entity, such as or { .
* @param entity the entity to write
* @throws IOException if there is a problem writing to the underlying stream
*/
public void writeEntity(String entity) throws IOException {
if (state == IN_TAG) {
out.write(">");
state = IN_BODY;
}
out.write(entity);
}
/**
* Write an image tag, using a specified path for the image source attribute.
* @param imagePath the path for the image source
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeImage(String imagePath) throws IOException {
startTag(IMAGE);
writeAttr(SRC, imagePath);
}
/**
* Write an image tag, using a specified path for the image source attribute.
* @param imageURL the url for the image source
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeImage(URL imageURL) throws IOException {
writeImage(imageURL.toString());
}
/**
* Write a hypertext link.
* @param anchor the target for the link
* @param body the body text for the link
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeLink(String anchor, String body) throws IOException {
startTag(A);
writeAttr(HREF, anchor);
write(body);
endTag(A);
}
/**
* Write a hypertext link.
* @param file the target for the link
* @param body the body text for the link
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeLink(File file, String body) throws IOException {
startTag(A);
StringBuffer sb = new StringBuffer();
String path = file.getPath().replace(File.separatorChar, '/');
if (file.isAbsolute() && !path.startsWith("/"))
sb.append('/');
sb.append(path);
writeAttr(HREF, sb.toString());
write(body);
endTag(A);
}
/**
* Write a hypertext link.
* @param file the target and body for the link
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeLink(File file) throws IOException {
writeLink(file, file.getPath());
}
/**
* Write a hypertext link.
* @param url the target for the link
* @param body the body text for the link
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeLink(URL url, String body) throws IOException {
startTag(A);
writeAttr(HREF, url.toString());
write(body);
endTag(A);
}
/**
* Write the destination marker for a hypertext link.
* @param anchor the destination marker for hypertext links
* @param body the body text for the marker
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeLinkDestination(String anchor, String body) throws IOException {
startTag(A);
writeAttr(NAME, anchor);
write(body);
endTag(A);
}
/**
* Write a parameter tag.
* @param name the name of the parameter
* @param value the value of the parameter
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeParam(String name, String value) throws IOException {
startTag(PARAM);
writeAttr(NAME, name);
writeAttr(VALUE, value);
}
/**
* Write a style attribute.
* @param value the value for the style atrtribute
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeStyleAttr(String value) throws IOException {
writeAttr(STYLE, value);
}
/**
* Write a localized message, using a specified resource bundle.
* @param i18n the resource bundle used to localize the message
* @param key the key for the message to be localized
* @throws IOException if there is a problem closing the underlying stream
*/
public void write(ResourceBundle i18n, String key) throws IOException {
write(getString(i18n, key));
}
/**
* Write a localized message, using a specified resource bundle.
* @param i18n the resource bundle used to localize the message
* @param key the key for the message to be localized
* @param arg an argument to be formatted into the localized message
* @throws IOException if there is a problem closing the underlying stream
*/
public void write(ResourceBundle i18n, String key, Object arg) throws IOException {
write(getString(i18n, key, arg));
}
/**
* Write a localized message, using a specified resource bundle.
* @param i18n the resource bundle used to localize the message
* @param key the key for the message to be localized
* @param args arguments to be formatted into the localized message
* @throws IOException if there is a problem closing the underlying stream
*/
public void write(ResourceBundle i18n, String key, Object[] args) throws IOException {
write(getString(i18n, key, args));
}
/**
* Write a localized message, using the default resource bundle.
* @param key the key for the message to be localized
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeI18N(String key) throws IOException {
write(getString(i18n, key));
}
/**
* Write a localized message, using the default resource bundle.
* @param key the key for the message to be localized
* @param arg an argument to be formatted into the localized message
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeI18N(String key, Object arg) throws IOException {
write(getString(i18n, key, arg));
}
/**
* Write a localized message, using the default resource bundle.
* @param key the key for the message to be localized
* @param args arguments to be formatted into the localized message
* @throws IOException if there is a problem closing the underlying stream
*/
public void writeI18N(String key, Object[] args) throws IOException {
write(getString(i18n, key, args));
}
private String getString(ResourceBundle rb, String key, Object... args) {
String s = rb.getString(key);
return MessageFormat.format(s, args);
}
/** The HTML "a" tag. */
public static final String A = "a";
/** The HTML "align" attribute. */
public static final String ALIGN = "align";
/** The HTML "b" tag. */
public static final String B = "b";
/** The HTML "body" tag. */
public static final String BODY = "body";
/** The HTML "border" attribute. */
public static final String BORDER = "border";
/** The HTML "br" tag. */
public static final String BR = "br";
/** The HTML "class" attribute. */
public static final String CLASS = "class";
/** The HTML "classid" attribute. */
public static final String CLASSID = "classid";
/** The HTML "code" tag. */
public static final String CODE = "code";
/** The HTML "color" attribte. */
public static final String COLOR = "color";
/** The HTML "col" attribute value. */
public static final String COL = "col";
/** The HTML "dd" tag. */
public static final String DD = "dd";
/** The HTML "div" tag. */
public static final String DIV = "div";
/** The HTML "dl" tag. */
public static final String DL = "dl";
/** The HTML "dt" tag. */
public static final String DT = "dt";
/** The HTML "font" tag. */
public static final String FONT = "font";
/** The HTML "h1" tag. */
public static final String H1 = "h1";
/** The HTML "h2" tag. */
public static final String H2 = "h2";
/** The HTML "h3" tag. */
public static final String H3 = "h3";
/** The HTML "h4" tag. */
public static final String H4 = "h4";
/** The HTML "h5" tag. */
public static final String H5 = "h5";
/** The HTML "head" tag. */
public static final String HEAD = "head";
/** The HTML "href" attribute. */
public static final String HREF = "href";
/** The HTML "html" tag. */
public static final String HTML = "html";
/** The HTML "hr" tag. */
public static final String HR = "hr";
/** The HTML "i" tag. */
public static final String I = "i";
/** The HTML "id" tag. */
public static final String ID = "id";
/** The HTML "image" tag. */
public static final String IMAGE = "image";
/** The HTML "left" attribute value. */
public static final String LEFT = "left";
/** The HTML "li" tag. */
public static final String LI = "li";
/** The HTML "link" tag. */
public static final String LINK = "link";
/** The HTML "name" attribute. */
public static final String NAME = "name";
/** The HTML "object" tag. */
public static final String OBJECT = "object";
/** The HTML "p" tag. */
public static final String PARAM = "param";
/** The HTML "param" tag. */
public static final String P = "p";
/** The HTML "rel" attribute value. */
public static final String REL = "rel";
/** The HTML "right" attribute value. */
public static final String RIGHT = "right";
/** The HTML "row" attribute value. */
public static final String ROW = "row";
/** The HTML "script" tag. */
public static final String SCRIPT = "script";
/** The HTML "small" tag. */
public static final String SMALL = "small";
/** The HTML "span" tag. */
public static final String SPAN = "span";
/** The HTML "src" attribute. */
public static final String SRC = "src";
/** The HTML "scope" attribute. */
public static final String SCOPE = "scope";
/** The HTML "style" attribute. */
public static final String STYLE = "style";
/** The HTML "table" tag. */
public static final String TABLE = "table";
/** The HTML "td" tag. */
public static final String TD = "td";
/** The HTML type for JavaScript. */
public static final String TEXT_JAVASCRIPT = "text/javascript";
/** The HTML "title"attribute. */
public static final String TITLE = "title";
/** The HTML "th" tag. */
public static final String TH = "th";
/** The HTML "top" attribute value. */
public static final String TOP = "top";
/** The HTML "tr" tag. */
public static final String TR = "tr";
/** The HTML "type" attribute. */
public static final String TYPE = "type";
/** The HTML "ul" tag. */
public static final String UL = "ul";
/** The HTML "valign" attribute. */
public static final String VALIGN = "valign";
/** The HTML "value" attribute. */
public static final String VALUE = "value";
private BufferedWriter out;
private int state;
private ResourceBundle i18n;
private static final int IN_TAG = 1;
private static final int IN_BODY = 2;
}
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