com.rtfparserkit.converter.text.AbstractTextConverter Maven / Gradle / Ivy

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Library that provides facilities to allow project information to be manipulated in Java and .Net. Supports a range of data formats: Microsoft Project Exchange (MPX), Microsoft Project (MPP,MPT), Microsoft Project Data Interchange (MSPDI XML), Microsoft Project Database (MPD), Planner (XML), Primavera (PM XML, XER, and database), Asta Powerproject (PP, MDB), Asta Easyplan (PP), Phoenix Project Manager (PPX), FastTrack Schedule (FTS), and the Standard Data Exchange Format (SDEF).

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/*
 * Copyright 2013 Jon Iles
 *
 * 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 com.rtfparserkit.converter.text;

import java.io.IOException;
import java.util.ArrayDeque;
import java.util.Deque;

import com.rtfparserkit.parser.IRtfParser;
import com.rtfparserkit.parser.IRtfSource;
import com.rtfparserkit.parser.RtfListenerAdaptor;
import com.rtfparserkit.parser.standard.StandardRtfParser;
import com.rtfparserkit.rtf.Command;
import com.rtfparserkit.rtf.CommandType;

/**
 * This class implements the core of a trivial RTF to text converter.
 * Subclasses implement the processExtractedText method to determine 
 * how the extracted text is handled.
 */
public abstract class AbstractTextConverter extends RtfListenerAdaptor
{
   public void convert(IRtfSource source) throws IOException
   {
      IRtfParser parser = new StandardRtfParser();
      currentDestination = Command.rtf;
      parser.parse(source, this);
   }

   /**
    * This method is called to process the test we've extracted from the RTF file.
    */
   public abstract void processExtractedText(String text);

   @Override
   public void processGroupStart()
   {
      destinationStack.push(currentDestination);
   }

   @Override
   public void processGroupEnd()
   {
      currentDestination = destinationStack.pop();
   }

   @Override
   public void processString(String string)
   {
      switch (currentDestination)
      {
         case rtf:
         case pntext:
         case fldrslt:
         {
            processExtractedText(string);
            break;
         }

         default:
         {
            // Do nothing
            break;
         }
      }

   }

   @Override
   public void processCommand(Command command, int parameter, boolean hasParameter, boolean optional)
   {
      if (command.getCommandType() == CommandType.Destination)
      {
         currentDestination = command;
      }

      switch (command)
      {
         case par:
         case line:
         case row:
         {
            processExtractedText("\n");
            break;
         }

         case tab:
         case cell:
         {
            processExtractedText("\t");
            break;
         }

         default:
         {
            // Do nothing
            break;
         }
      }
   }

   private Command currentDestination = Command.rtf;
   private final Deque destinationStack = new ArrayDeque<>();
}