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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.empire.struts2.html;
import java.io.IOException;
import java.io.Writer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.empire.commons.StringUtils;
import org.apache.commons.lang.xwork.StringEscapeUtils;
public class HtmlWriter
{
// Logger
protected static Logger log = LoggerFactory.getLogger(HtmlWriter.class);
public static class HtmlTag
{
private HtmlWriter w;
private String name;
private boolean hasBody;
protected HtmlTag(HtmlWriter writer, String name, boolean hasBody)
{
this.w = writer;
this.name = name;
this.hasBody = hasBody;
}
protected void startTag()
{
// write start
if (name!=null)
{
w.print("<");
w.print(name);
}
}
public boolean isValid()
{
return (w!=null && name!=null);
}
public void addAttributes(String attributes)
{
if (name==null || attributes==null)
return; // Ignore Attributes with null values
w.print(" ");
w.print(attributes);
}
public void addAttributeNoCheck(String attrib, Object value, boolean escapeHtml)
{
if (name==null)
return;
// Get String value
String strValue = StringUtils.valueOf(value);
if (escapeHtml)
strValue = StringEscapeUtils.escapeHtml(strValue);
// Add Attribute
w.print(" ");
w.print(attrib);
w.print("=\"");
w.print(strValue);
w.print("\"");
}
public void addAttribute(String attrib, Object value, boolean escapeHtml)
{
if (name==null || value==null)
return; // Ignore Attributes with null values
String strValue = value.toString();
if (strValue==null || strValue.length()==0)
return; // Ingore Emtpy Strings
if (escapeHtml)
strValue = StringEscapeUtils.escapeHtml(strValue);
w.print(" ");
w.print(attrib);
w.print("=\"");
w.print(strValue);
w.print("\"");
}
public void addAttribute(String attrib, Object value)
{
addAttribute(attrib, value, false);
}
public void addAttribute(String attrib)
{
addAttribute(attrib, attrib, false);
}
public void addAttribute(String attrib, boolean present)
{
if (present)
addAttribute(attrib, attrib, false);
}
public void beginBody(String body, boolean newLine)
{
if (name!=null)
w.print(">", newLine);
if (body!=null)
w.print(body);
hasBody = true;
}
public void beginBody(String body)
{
beginBody(body, false);
}
public void beginBody(boolean newLine)
{
beginBody(null, newLine);
}
public void beginBody()
{
beginBody(null, false);
}
public void endTag(String body, boolean newLine)
{
// Write body
if (body!=null && body.length()>0)
{
if (hasBody==false)
beginBody(body, false);
else w.print(body);
}
// End of Tag
if (name!=null)
{
// Check Body
if (hasBody)
{
w.print("", newLine);
}
else
{
w.print(" />", newLine);
}
}
// done
w = null;
}
public void endTag(String body)
{
endTag(body, false);
}
public void endTag(boolean newLine)
{
endTag(null, newLine);
}
public void endTag()
{
endTag(null, false);
}
}
private Writer writer;
public HtmlWriter(Writer writer)
{
this.writer = writer;
}
private void print(String text, boolean endOfLine)
{
try {
// Check Param
if (text==null)
{
log.warn("cannot print text value of null!");
return; // nothing do do
}
// Print now
writer.write(text);
if (endOfLine)
writer.write("\n");
} catch(IOException e) {
log.error(e.getMessage(), e);
}
}
public void print(String text)
{
print(text, false);
}
public void println(String text)
{
print(text, true);
}
public void println()
{
print("", true);
}
public HtmlTag startTag(String name)
{
HtmlTag tag = new HtmlTag(this, name, false);
tag.startTag();
return tag;
}
public HtmlTag continueTag(String name, boolean hasBody)
{
return new HtmlTag(this, name, hasBody);
}
}
