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The Open Source version of the IBM Toolbox for Java
///////////////////////////////////////////////////////////////////////////////
//
// JTOpen (IBM Toolbox for Java - OSS version)
//
// Filename: HTMLServlet.java
//
// The source code contained herein is licensed under the IBM Public License
// Version 1.0, which has been approved by the Open Source Initiative.
// Copyright (C) 1997-2001 International Business Machines Corporation and
// others. All rights reserved.
//
///////////////////////////////////////////////////////////////////////////////
package com.ibm.as400.util.html;
import com.ibm.as400.access.Trace;
import com.ibm.as400.access.ExtendedIllegalStateException;
import com.ibm.as400.access.ExtendedIllegalArgumentException;
import java.util.Vector;
import java.beans.PropertyChangeSupport;
import java.beans.PropertyChangeListener;
/**
* The HTMLServlet class represents a server-side include in an HTML page.
*
* This example creates a HTMLServlet tag:
*
* // Create an HTMLServlet.
* HTMLServlet servlet = new HTMLServlet("myServlet", "http://server:port/dir");
*
* // Create a parameter, then add it to the servlet.
* HTMLParameter param = new HTMLParameter("parm1", "value1");
* servlet.addParameter(param);
*
* // Create and add second parameter
* HTMLParameter param2 = servlet.add("parm2", "value2");
* System.out.println(servlet);
*
*
* Here is the output of the HTMLServlet tag:
*
* <servlet name="myServlet" codebase="http://server:port/dir">
* <param name="parm1" value="value1">
* <param name="parm2" value="value2">
* If you see this text, the web server providing this page does not support the SERVLET tag.
* </servlet>
*
*
* HTMLServlet objects generate the following events:
*
* - ElementEvent - The events fired are:
*
* - elementAdded
*
- elementRemoved
*
* - PropertyChangeEvent
*
**/
public class HTMLServlet extends HTMLTagAttributes implements java.io.Serializable // @Z1C
{
private static final String copyright = "Copyright (C) 1997-2001 International Business Machines Corporation and others.";
static final long serialVersionUID = -3782566892366981877L;
private String name_;
// The alternate text will get displayed if the servlet does not appear in the browser.
private String text_ = loader_.getText("PROP_DESC_SERVLET_ALTTEXT");
private String location_;
private Vector list_; // The list of servlet parameters.
// Handles loading the appropriate resource bundle
private static ResourceBundleLoader_h loader_;
transient private Vector elementListeners; // The list of element listeners @CRS
/**
* Constructs a default HTMLServlet object.
**/
public HTMLServlet()
{
super();
list_ = new Vector();
}
/**
* Constructs an HTMLServlet object with the specified servlet name.
*
* @param name The servlet name.
**/
public HTMLServlet(String name)
{
super();
setName(name);
list_ = new Vector();
}
/**
* Constructs an HTMLServlet object with the specified servlet name and location.
*
* @param name The servlet name.
* @param location The servlet location (http://server:port/dir).
**/
public HTMLServlet(String name, String location)
{
super();
setName(name);
setLocation(location);
list_ = new Vector();
}
/**
* Adds an HTMLparameter to the servlet tag.
*
* @param param The parameter.
**/
public void addParameter(HTMLParameter param) //$A2C
{
//@B1D
if (param == null)
throw new NullPointerException("param");
// add parameter to the list
list_.addElement(param);
fireElementEvent(ElementEvent.ELEMENT_ADDED);
}
/**
* Adds an HTMLParameter to the servlet.
*
* @param name The parameter name.
* @param value The parameter value.
*
* @return A HTMLParameter object.
**/
public HTMLParameter addParameter(String name, String value) //$A2C
{
//@B1D
if (name == null)
throw new NullPointerException("name");
if (value == null)
throw new NullPointerException("value");
//Create the HTMLParameter from the values passed in
HTMLParameter param = new HTMLParameter(name,value);
// Add the HTMLParameter to the group.
list_.addElement(param);
fireElementEvent(ElementEvent.ELEMENT_ADDED);
return param;
}
/**
* Adds an addElementListener.
* The specified addElementListeners elementAdded method will
* be called each time a HTMLParameter is added to the group.
* The addElementListener object is added to a list of addElementListeners
* managed by this HTMLServlet. It can be removed with removeElementListener.
*
* @see #removeElementListener
*
* @param listener The ElementListener.
**/
public void addElementListener(ElementListener listener)
{
if (listener == null)
throw new NullPointerException ("listener");
if (elementListeners == null) elementListeners = new Vector(); //@CRS
elementListeners.addElement(listener);
}
/**
* Fires the element event.
**/
private void fireElementEvent(int evt)
{
if (elementListeners == null) return;
Vector targets;
targets = (Vector) elementListeners.clone();
ElementEvent elementEvt = new ElementEvent(this, evt);
for (int i = 0; i < targets.size(); i++)
{
ElementListener target = (ElementListener)targets.elementAt(i);
if (evt == ElementEvent.ELEMENT_ADDED)
target.elementAdded(elementEvt);
else if (evt == ElementEvent.ELEMENT_REMOVED)
target.elementRemoved(elementEvt);
}
}
/**
* Returns the location of the servlet.
* @return The location.
**/
public String getLocation()
{
return location_;
}
/**
* Returns the name of the servlet.
* @return The name.
**/
public String getName()
{
return name_;
}
/**
* Returns the alternate text of the servlet.
* @return The text.
**/
public String getText()
{
return text_;
}
/**
* Returns a comment tag.
* This method should not be called. There is no XSL-FO support for this class.
* @return The comment tag.
**/
public String getFOTag() //@C1A
{
Trace.log(Trace.ERROR, "Attempting to getFOTag() for an object that doesn't support it.");
return "";
}
/**
* Returns the tag for the HTML servlet.
* @return The tag.
**/
public String getTag()
{
//@B1D
if (name_ == null)
{
Trace.log(Trace.ERROR, "Attempting to get tag before setting servlet name.");
throw new ExtendedIllegalStateException(
"name", ExtendedIllegalStateException.PROPERTY_NOT_SET );
}
StringBuffer s = new StringBuffer("\n");
}
else
{
s.append(getAttributeString()); // @Z1A
s.append(">\n");
}
// add parameters to the servlet tag
for (int i=0; i< list_.size(); i++)
{
HTMLParameter p = (HTMLParameter)list_.elementAt(i); //$A2C
s.append(p.getTag());
}
s.append(getText() + "\n");
s.append("\n");
return s.toString();
}
/**
* Deserializes and initializes transient data.
**/
private void readObject(java.io.ObjectInputStream in)
throws java.io.IOException, ClassNotFoundException
{
in.defaultReadObject();
//@CRS changes_ = new PropertyChangeSupport(this);
//@CRS elementListeners = new Vector();
}
/**
* Removes an HTMLParameter from the servlet tag.
* @param param The parameter.
**/
public void removeParameter(HTMLParameter param) //$A2C
{
if (param == null)
throw new NullPointerException("param");
//@B1D
if (list_.removeElement(param))
fireElementEvent(ElementEvent.ELEMENT_REMOVED);
}
/**
* Removes this ElementListener from the internal list.
* If the ElementListener is not on the list, nothing is done.
*
* @see #addElementListener
*
* @param listener The ElementListener.
**/
public void removeElementListener(ElementListener listener)
{
if (listener == null)
throw new NullPointerException ("listener");
if (elementListeners != null) elementListeners.removeElement(listener); //@CRS
}
/**
* Sets the location for the servlet source. It can refer to a remote location from which
* the servlet should be loaded. The default location is assumed to be local.
*
* @param location The location.
**/
public void setLocation(String location)
{
if (location == null)
throw new NullPointerException("location");
if (location.length() == 0 )
{
throw new ExtendedIllegalArgumentException("location", ExtendedIllegalArgumentException.LENGTH_NOT_VALID);
}
//@B1D
String old = location_;
location_ = location;
if (changes_ != null) changes_.firePropertyChange("location", old, location ); //@CRS
}
/**
* Sets the class name of the servlet.
*
* @param name The name.
**/
public void setName(String name)
{
if (name == null)
throw new NullPointerException("name");
if (name.length() == 0)
throw new ExtendedIllegalArgumentException("name",
ExtendedIllegalArgumentException.LENGTH_NOT_VALID);
//@B1D
String old = name_;
name_ = name;
if (changes_ != null) changes_.firePropertyChange("name", old, name ); //@CRS
}
/**
* Set the alternate text for the servlet, which will be displayed if
* the web server does not support the servlet tag.
*
* @param text The alternate text.
**/
public void setText(String text)
{
if (text == null)
throw new NullPointerException("text");
if (text.length() == 0)
throw new ExtendedIllegalArgumentException("text",
ExtendedIllegalArgumentException.LENGTH_NOT_VALID);
//@B1D
String old = text_;
text_ = text;
if (changes_ != null) changes_.firePropertyChange("text", old, text ); //@CRS
}
/**
* Returns a String representation for the HTMLServlet tag.
* @return The tag.
**/
public String toString()
{
return getTag();
}
}
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