/*
 * $Id: NestedWriteNestingTag.java 54929 2004-10-16 16:38:42Z germuska $ 
 *
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * Licensed 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.struts.taglib.nested;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.BodyTagSupport;

import org.apache.struts.taglib.TagUtils;

/**
 * NestedWriteNestingTag.
 *
 * Created so developers could have a more elegant way of getting to the
 * underlying nested property their tag properties are referencing.
 *
 * @since Struts 1.1
 * @version $Rev: 54929 $
 */
public class NestedWriteNestingTag extends BodyTagSupport {

  /** Getter method for the <i>property</i> property
   * @return String value of the property property
   */
  public String getProperty() {
    return this.property;
  }

  /** Setter method for the <i>property</i> property
   * @param newProperty new value for the property property
   */
  public void setProperty(String newProperty) {
    this.property = newProperty;
  }


  /** Getter method for the <i>id</i> property
   * @return String value for the id property
   */
  public String getId() {
        return id;
  }

  /** Setter method for the <i>id</i> property
   * @param id new value for the id property
   */
  public void setId(String id) {
    this.id = id;
  }


  /** Getter method for the <i>filter</i> property
   * @return String value of the filter property
   */
  public boolean getFilter() {
    return this.filter;
  }

  /** Setter method for the <i>filter</i> property
   * @param newFilter new value for the filter property
   */
  public void setFilter(boolean newFilter) {
    this.filter = newFilter;
  }


  /**
   * Overriding method of the heart of the tag. Gets the relative property
   * and tells the JSP engine to evaluate its body content.
   *
   * @return int JSP continuation directive.
   */
  public int doStartTag() throws JspException {
    // set the original property
    originalProperty = property;

    HttpServletRequest request = (HttpServletRequest)pageContext.getRequest();
    String nesting = NestedPropertyHelper.getAdjustedProperty(request, property);

    if (id != null) {
      // use it as a scripting variable instead
      pageContext.setAttribute(id, nesting);

    } else {
      /* write output, filtering if required */
      if (this.filter) {
        TagUtils.getInstance().write(pageContext, TagUtils.getInstance().filter(nesting));
      } else {
        TagUtils.getInstance().write(pageContext, nesting);
      }
    }

    /* continue with page processing */
    return (SKIP_BODY);
  }

  public int doEndTag() throws JspException {
    // do the super thing
    int i = super.doEndTag();
    // reset the property
    property = originalProperty;
    // complete
    return i;
  }


  /**
   * JSP method to release all resources held by the tag.
   */
  public void release() {
    super.release();
    this.filter = false;
    this.property = null;
    this.originalProperty = null;
  }

  /* the usual private member variables */
  private boolean filter = false;
  private String property = null;
  private String id = null;
  private String originalProperty = null;
}