- package com.sun.org.apache.regexp.internal;
-
- /*
- * ====================================================================
- *
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 1999 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution, if
- * any, must include the following acknowlegement:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowlegement may appear in the software itself,
- * if and wherever such third-party acknowlegements normally appear.
- *
- * 4. The names "The Jakarta Project", "Jakarta-Regexp", and "Apache Software
- * Foundation" must not be used to endorse or promote products derived
- * from this software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache"
- * nor may "Apache" appear in their names without prior written
- * permission of the Apache Group.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- *
- */
-
- import java.io.Reader;
- import java.io.IOException;
-
- /** Encapsulates InputStream, ...
- *
- * @author <a href="mailto:ales.novak@netbeans.com">Ales Novak</a>
- */
- public final class ReaderCharacterIterator implements CharacterIterator
- {
- /** Underlying is */
- private final Reader reader;
-
- /** Buffer of read chars */
- private final StringBuffer buff;
-
- /** read end? */
- private boolean closed;
-
- /** @param is an Reader, which is parsed */
- public ReaderCharacterIterator(Reader reader)
- {
- this.reader = reader;
- this.buff = new StringBuffer(512);
- this.closed = false;
- }
-
- /** @return a substring */
- public String substring(int offset, int length)
- {
- try
- {
- ensure(offset + length);
- return buff.toString().substring(offset, length);
- }
- catch (IOException e)
- {
- throw new StringIndexOutOfBoundsException(e.getMessage());
- }
- }
-
- /** @return a substring */
- public String substring(int offset)
- {
- try
- {
- readAll();
- return buff.toString().substring(offset);
- }
- catch (IOException e)
- {
- throw new StringIndexOutOfBoundsException(e.getMessage());
- }
- }
-
- /** @return a character at the specified position. */
- public char charAt(int pos)
- {
- try
- {
- ensure(pos);
- return buff.charAt(pos);
- }
- catch (IOException e)
- {
- throw new StringIndexOutOfBoundsException(e.getMessage());
- }
- }
-
- /** @return <tt>true</tt> iff if the specified index is after the end of the character stream */
- public boolean isEnd(int pos)
- {
- if (buff.length() > pos)
- {
- return false;
- }
- else
- {
- try
- {
- ensure(pos);
- return (buff.length() <= pos);
- }
- catch (IOException e)
- {
- throw new StringIndexOutOfBoundsException(e.getMessage());
- }
- }
- }
-
- /** Reads n characters from the stream and appends them to the buffer */
- private int read(int n) throws IOException
- {
- if (closed)
- {
- return 0;
- }
-
- char[] c = new char[n];
- int count = 0;
- int read = 0;
-
- do
- {
- read = reader.read(c);
- if (read < 0) // EOF
- {
- closed = true;
- break;
- }
- count += read;
- buff.append(c, 0, read);
- }
- while (count < n);
-
- return count;
- }
-
- /** Reads rest of the stream. */
- private void readAll() throws IOException
- {
- while(! closed)
- {
- read(1000);
- }
- }
-
- /** Reads chars up to the idx */
- private void ensure(int idx) throws IOException
- {
- if (closed)
- {
- return;
- }
-
- if (idx < buff.length())
- {
- return;
- }
- read(idx + 1 - buff.length());
- }
- }