| package org.apache.maven.doxia.util; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| /* |
| * Originally from org.apache.doxia.module.apt.AptReaderSource. It was modified |
| * to get unget support |
| */ |
| |
| import java.io.IOException; |
| import java.io.LineNumberReader; |
| import java.io.Reader; |
| |
| import org.apache.maven.doxia.parser.ParseException; |
| import org.codehaus.plexus.util.IOUtil; |
| |
| /** |
| * {@link ByLineSource} default implementation |
| * |
| * @version $Id$ |
| */ |
| public class ByLineReaderSource implements ByLineSource |
| { |
| /** |
| * reader |
| */ |
| private LineNumberReader reader; |
| |
| /** |
| * current line number |
| */ |
| private int lineNumber; |
| |
| /** |
| * holds the last line returned by getNextLine() |
| */ |
| private String lastLine; |
| |
| /** |
| * <code>true</code> if ungetLine() was called and no getNextLine() was |
| * called |
| */ |
| private boolean ungetted = false; |
| |
| private String name; |
| |
| /** |
| * Creates the ByLineReaderSource. |
| * |
| * @param in real source :) |
| */ |
| public ByLineReaderSource( final Reader in ) |
| { |
| this( in, "" ); |
| } |
| |
| public ByLineReaderSource( final Reader in, final String name ) |
| { |
| this.reader = new LineNumberReader( in ); |
| |
| this.name = name; |
| |
| this.lineNumber = -1; |
| } |
| |
| /** {@inheritDoc} */ |
| public final String getNextLine() throws ParseException |
| { |
| if ( reader == null ) |
| { |
| return null; |
| } |
| |
| if ( ungetted ) |
| { |
| ungetted = false; |
| return lastLine; |
| } |
| |
| String line; |
| |
| try |
| { |
| line = reader.readLine(); |
| if ( line == null ) |
| { |
| reader.close(); |
| reader = null; |
| } |
| else |
| { |
| lineNumber = reader.getLineNumber(); |
| } |
| } |
| catch ( IOException e ) |
| { |
| throw new ParseException( e, lineNumber, 0 ); |
| } |
| |
| lastLine = line; |
| |
| return line; |
| } |
| |
| /** {@inheritDoc} */ |
| public final String getName() |
| { |
| return name; |
| } |
| |
| /** {@inheritDoc} */ |
| public final int getLineNumber() |
| { |
| return lineNumber; |
| } |
| |
| /** {@inheritDoc} */ |
| public final void close() |
| { |
| IOUtil.close( reader ); |
| reader = null; |
| } |
| |
| /** {@inheritDoc} */ |
| public final void ungetLine() |
| { |
| if ( ungetted ) |
| { |
| throw new IllegalStateException( "we support only one level of ungetLine()" ); |
| } |
| ungetted = true; |
| } |
| |
| /** {@inheritDoc} */ |
| public final void unget( final String s ) |
| { |
| if ( s == null ) |
| { |
| throw new IllegalArgumentException( "argument can't be null" ); |
| } |
| if ( s.length() != 0 ) |
| { |
| ungetLine(); |
| lastLine = s; |
| } |
| } |
| } |