InsertTag.java

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package template;

import javax.servlet.ServletException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import java.util.HashMap;

public class InsertTag extends SimpleTagSupport {
   private String parameterName = null;
   private String definitionName = null;

   public InsertTag() {
      super();
   }
   public void setParameter(String parameter) {
      this.parameterName = parameter;
   }
   public void setDefinition(String name) {
      this.definitionName = name;
   }
   public void doTag() throws JspTagException {
    Definition definition = null;
    Parameter parameter = null;
    boolean directInclude = false;		    
    PageContext context = (PageContext)getJspContext();

    // get the definition from the page context
    definition = (Definition)context.getAttribute(definitionName, context.APPLICATION_SCOPE);
    // get the parameter
    if (parameterName != null && definition != null)
        parameter = (Parameter) definition.getParam(parameterName);

    if (parameter != null)
        directInclude = parameter.isDirect();

    try {
        // if parameter is direct, print to out
        if (directInclude && parameter  != null)
          context.getOut().print(parameter.getValue());
        // if parameter is indirect, include results of dispatching to page 
        else {
          if ((parameter != null) && (parameter.getValue() !=  null))
              context.include(parameter.getValue());
        }
      } catch (Exception ex) {
          Throwable rootCause = null;
          if (ex instanceof ServletException) {
      			rootCause = ((ServletException) ex).getRootCause();
          }
     			throw new JspTagException(ex.getMessage(), rootCause);
    	}
   }
}