abstracttag.java

来自「jakarta-taglibs」· Java 代码 · 共 90 行

/*
 * 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.taglibs.io;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

import javax.servlet.ServletContext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.TagSupport;

/** A useful base class for Tags
  *
  * @author <a href="mailto:[e-mail]">James Strachan</a>
  * @version $Revision: 1.2 $
  */
public class AbstractTag extends TagSupport {

    // #### SHOULD MOVE TO LOG4J ASAP
    
    /** Is tracing enabled? */
    protected static final boolean TRACE = false;
    
    /** Are warnings enabled? */
    protected static final boolean WARN = true;
    
    
    public AbstractTag() {
    }
    
    /** Handles non-JspExceptions thrown in this instance
      */
    protected void handleException( Exception e ) throws JspException {
        warn( "ERROR: Caught", e );
        if ( e instanceof JspException ) {
            throw (JspException) e;
        }
        else {
            pageContext.getServletContext().log( e.getMessage(), e );

            if ( WARN ) {
                warn( "Caught Exception: ", e );
            }
            throw new JspException( e.getMessage() );
        }
    }
    
    protected void warn(String text) {
        System.out.println( "WARNING: " + text );
        //pageContext.getServletContext().log( text );
    }
    
    protected void warn(String text, Exception e) {
        System.out.println( "WARNING: " + text + e );
        //pageContext.getServletContext().log( text + e );
        e.printStackTrace();
    }
    
    protected void log(String text ) {
        System.out.println( text );
        //pageContext.getServletContext().log( text );
    }
    
}