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/* 
Copyright 2012 Brian Hawkins
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.agileclick.genorm;

import java.io.*;
import java.net.*;
import java.util.*;

public class TextReplace
	{
	private String m_token;
	private String m_tokenDoc;
	
	public TextReplace(String fileName, String token)
			throws IOException
		{
		this(new FileInputStream(fileName), token);		
		}
		
	public TextReplace(URL url, String token)
			throws IOException
		{
		this(url.openStream(), token);
		}
		
	public TextReplace(InputStream iStream, String token)
			throws IOException
		{
		InputStreamReader isr = new InputStreamReader(iStream);
		StringBuilder sb = new StringBuilder(128);
		int inputChar;
		
		while ((inputChar = isr.read()) != -1)
			sb.append((char)inputChar);
			
		isr.close();
		
		m_tokenDoc = sb.toString();
		m_token = token;
		}
		
	public TextReplace(String text, String token, boolean bogus)
		{
		m_tokenDoc = text;
		m_token = token;
		}
		
	public String replaceTextWith(Map replacements)
		{
		StringBuilder sb = new StringBuilder();			
		StringTokenizer st = new StringTokenizer(m_tokenDoc, m_token);
		String value;
		String s;
		int i = 0;
		boolean tag = false;
		
		while (st.hasMoreTokens())
			{
			s = st.nextToken();
			if ((value = (String)replacements.get(s)) != null)
				{
				tag = true;
				sb.append(value);
				}
			else
				{
				if ((i != 0)&&(!tag))
					sb.append(m_token);
				sb.append(s);
				tag = false;
				}
			i++;
			}
		
		return (sb.toString());
		}
	}