/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

/*
 * Copyright 2004-2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
* LineTokeReplacer.java
*/

package com.sun.enterprise.admin.util;

import java.io.File;
import java.io.Reader;
import java.io.Writer;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;

import com.sun.enterprise.admin.util.TokenValue;
import com.sun.enterprise.admin.util.TokenValueSet;

/**
 */
public final class LineTokenReplacer {
    
    private final TokenValue[]      tokenArray;
    private final String charsetName;
    
    public LineTokenReplacer(TokenValueSet tokens) {
        this(tokens, null);
    }
    
    /** Creates a new instance of TokenReplacer */
    public LineTokenReplacer(TokenValueSet tokens, String charset) {
            final Object[] tmp = tokens.toArray();
            final int length = tmp.length;
            this.tokenArray = new TokenValue[length];
            System.arraycopy(tmp, 0, tokenArray, 0, length);
            this.charsetName = charset;
    }

    public void replace(File inputFile, File outputFile) {
        //Edge-cases
        BufferedReader reader = null;
        BufferedWriter writer = null;
        try {
            reader = new BufferedReader(new FileReader(inputFile));
            if(charsetName!=null)
            {
                FileOutputStream outputStream = new FileOutputStream(outputFile);
                Charset charset = Charset.forName(charsetName);
                writer = new BufferedWriter(new OutputStreamWriter(outputStream, charset));
            }
            else
            {
                writer = new BufferedWriter(new FileWriter(outputFile));
            }
            String lineContents = null;
            while((lineContents = reader.readLine()) != null) {
                String modifiedLine = replaceLine(lineContents);
                writer.write(modifiedLine);
                writer.newLine();
            }
        }
        catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
        finally {
            try {
                if (reader != null)
                    reader.close();
                if (writer != null)
                    writer.close();
            }
            catch(Exception e) {}
        }
    }
    
    public void replace(String inputFileName, String outputFileName) {
        this.replace(new File(inputFileName), new File(outputFileName));
    }
    
    private String replaceLine(String lineWithTokens) {
        String tokenFreeString = lineWithTokens;
        
        for (int i = 0 ; i < tokenArray.length ; i++) {
            TokenValue aPair        = tokenArray[i];
            //System.out.println("To replace: " + aPair.delimitedToken);
            //System.out.println("Value replace: " + aPair.value);
            tokenFreeString = tokenFreeString.replaceAll(aPair.delimitedToken,
                aPair.value);
        }
        return ( tokenFreeString );
    }
}