/*
 * Created on 25-ott-2004
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package com.opensymphony.oscache.web.filter;

import javax.servlet.http.HttpServletResponse;

/**
 * Intercept the content type when being set via the header
 * 
 * @author Simone Avogadro
 */
public class TypedCacheHttpServletResponseWrapper extends
        CacheHttpServletResponseWrapper {

    private static final String HEADER_CONTENT_TYPE = "Content-Type";

    int settingContentType = 0;
    
    /**
     * @param response
     */
    public TypedCacheHttpServletResponseWrapper(HttpServletResponse response) {
        super(response);
    }
    
    /**
     * Set a header field
     *
     * @param name The header name
     * @param value The header value
     */
    public void setHeader(String name, String value) {
        if (settingContentType==0 &&
            HEADER_CONTENT_TYPE.equalsIgnoreCase(name)	) {
            super.setContentType(value);
        }
        super.setHeader(name,value);
    }
    
    /**
     * Add an header field
     *
     * @param name The header name
     * @param value The header value
     */
    public void addHeader(String name, String value) {
        if (settingContentType==0 &&
            HEADER_CONTENT_TYPE.equalsIgnoreCase(name)	) {
            super.setContentType(value);
	  	}
        super.addHeader(name,value);        
    }

    /**
     * Set the content type
     *
     * @param value The content type
     */
    public void setContentType(String value) {
        settingContentType++;
        super.setContentType(value);
        settingContentType--;
    }
    
}