extractpropertyparametertag.java

招标投标网上系统

/*  * $Id: ExtractPropertyParameterTag.java,v 1.5 2001/10/23 21:47:57 gmurray Exp $
 * Copyright 2000 Sun Microsystems, Inc. All rights reserved.
 * Copyright 2000 Sun Microsystems, Inc. Tous droits r?erv?.
 */

package com.neusoft.taglibs.smart;

import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

/**  *  * This class is to be used with the ExtractProperty tag to specfiy parameters on
 * the method calls to the respective objects *  */

public class ExtractPropertyParameterTag
    extends BodyTagSupport {
  private String parameter = null;
  private String arg = null;
  private String id = null;
  private String scope = null;
  private String type = "java.lang.String";
  private String defaultValue = "";

  public ExtractPropertyParameterTag() {
    super();
  }

  public void setParameter(String parameter) {
    this.parameter = parameter;
  }

  public void setScope(String scope) {
    this.scope = scope;
  }

  public void setId(String id) {
    this.id = id;
  }

  public void setType(String type) {
    this.type = type;
    if (type.toLowerCase().equals("string")) {
      this.type = "java.lang.String";
    }
  }

  public void setDefault(String defaultValue) {
    this.defaultValue = defaultValue;
  }

  public void setArg(String arg) {
    this.arg = arg;
  }

  public int doStartTag() throws JspTagException {
    // add the parameter to the parameter list of the ExtractPropertyTag
    ExtractPropertyTag parent = (ExtractPropertyTag) findAncestorWithClass(this,
        ExtractPropertyTag.class);
    if (parameter == null && arg == null && id == null) {
      throw new JspTagException("ExtractPropertyParamterTag:  Either an arg, parameter, or (id and scope) must be specified.");
    }
    if (parameter != null && arg != null) {
      throw new JspTagException(
          "ExtractPropertyParamterTag:  An arg and parameter cannot both be specified.");
    }
    if (parent == null) {
      throw new JspTagException("ExtractPropertyParamterTag: ExtractPropertyParamterTag tag not inside items tag");
    }
    String theArg = null;
    if (parameter != null) {
      theArg = pageContext.getRequest().getParameter(parameter);
      if (theArg == null) {
        theArg = defaultValue;
      }
      if (defaultValue.equals("null")) {
        theArg = null;
      }
    }
    else if (arg != null) {
      theArg = arg;
    }
    else if (id != null) {
      // get the parameter from the scope
      if (scope == null) {
        throw new JspTagException(
            "ExtractPropertyParamterTag: A scope must be set with the attribute id");
      }
      // XXXX make capable of doing more than strings later
      if (scope.toLowerCase().equals("request")) {
        theArg = (String) pageContext.getRequest().getAttribute(id);
      }
      else if (scope.toLowerCase().equals("session")) {
        theArg = (String) pageContext.getSession().getAttribute(id);
      }
      else if (scope.toLowerCase().equals("page")) {
        theArg = (String) pageContext.getAttribute(id);
      }
    }
    parent.addParameter(theArg, type);
    return EVAL_BODY_TAG;
  }
}