+++ /dev/null
-/*******************************************************************************
- * Copyright (c) 2000, 2005 IBM Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- *******************************************************************************/
-package net.sourceforge.phpdt.internal.ui.text;
-
-import java.text.CharacterIterator;
-
-import org.eclipse.jface.text.Assert;
-import org.eclipse.jface.text.BadLocationException;
-import org.eclipse.jface.text.IDocument;
-
-/**
- * An <code>IDocument</code> based implementation of
- * <code>CharacterIterator</code> and <code>CharSequence</code>. Note that
- * the supplied document is not copied; if the document is modified during the
- * lifetime of a <code>DocumentCharacterIterator</code>, the methods
- * returning document content may not always return the same values. Also, if
- * accessing the document fails with a {@link BadLocationException}, any of
- * <code>CharacterIterator</code> methods as well as <code>charAt</code>may
- * return {@link CharacterIterator#DONE}.
- *
- * @since 3.0
- */
-public class DocumentCharacterIterator implements CharacterIterator,
- CharSequence {
-
- private int fIndex = -1;
-
- private final IDocument fDocument;
-
- private final int fFirst;
-
- private final int fLast;
-
- private void invariant() {
- Assert.isTrue(fIndex >= fFirst);
- Assert.isTrue(fIndex <= fLast);
- }
-
- /**
- * Creates an iterator for the entire document.
- *
- * @param document
- * the document backing this iterator
- */
- public DocumentCharacterIterator(IDocument document) {
- this(document, 0);
- }
-
- /**
- * Creates an iterator, starting at offset <code>first</code>.
- *
- * @param document
- * the document backing this iterator
- * @param first
- * the first character to consider
- * @throws IllegalArgumentException
- * if the indices are out of bounds
- */
- public DocumentCharacterIterator(IDocument document, int first)
- throws IllegalArgumentException {
- this(document, first, document.getLength());
- }
-
- /**
- * Creates an iterator for the document contents from <code>first</code>
- * (inclusive) to <code>last</code> (exclusive).
- *
- * @param document
- * the document backing this iterator
- * @param first
- * the first character to consider
- * @param last
- * the last character index to consider
- * @throws IllegalArgumentException
- * if the indices are out of bounds
- */
- public DocumentCharacterIterator(IDocument document, int first, int last)
- throws IllegalArgumentException {
- if (document == null)
- throw new NullPointerException();
- if (first < 0 || first > last)
- throw new IllegalArgumentException();
- if (last > document.getLength())
- throw new IllegalArgumentException();
- fDocument = document;
- fFirst = first;
- fLast = last;
- fIndex = first;
- invariant();
- }
-
- /*
- * @see java.text.CharacterIterator#first()
- */
- public char first() {
- return setIndex(getBeginIndex());
- }
-
- /*
- * @see java.text.CharacterIterator#last()
- */
- public char last() {
- if (fFirst == fLast)
- return setIndex(getEndIndex());
- else
- return setIndex(getEndIndex() - 1);
- }
-
- /*
- * @see java.text.CharacterIterator#current()
- */
- public char current() {
- if (fIndex >= fFirst && fIndex < fLast)
- try {
- return fDocument.getChar(fIndex);
- } catch (BadLocationException e) {
- // ignore
- }
- return DONE;
- }
-
- /*
- * @see java.text.CharacterIterator#next()
- */
- public char next() {
- return setIndex(Math.min(fIndex + 1, getEndIndex()));
- }
-
- /*
- * @see java.text.CharacterIterator#previous()
- */
- public char previous() {
- if (fIndex > getBeginIndex()) {
- return setIndex(fIndex - 1);
- } else {
- return DONE;
- }
- }
-
- /*
- * @see java.text.CharacterIterator#setIndex(int)
- */
- public char setIndex(int position) {
- if (position >= getBeginIndex() && position <= getEndIndex())
- fIndex = position;
- else
- throw new IllegalArgumentException();
-
- invariant();
- return current();
- }
-
- /*
- * @see java.text.CharacterIterator#getBeginIndex()
- */
- public int getBeginIndex() {
- return fFirst;
- }
-
- /*
- * @see java.text.CharacterIterator#getEndIndex()
- */
- public int getEndIndex() {
- return fLast;
- }
-
- /*
- * @see java.text.CharacterIterator#getIndex()
- */
- public int getIndex() {
- return fIndex;
- }
-
- /*
- * @see java.text.CharacterIterator#clone()
- */
- public Object clone() {
- try {
- return super.clone();
- } catch (CloneNotSupportedException e) {
- throw new InternalError();
- }
- }
-
- /*
- * @see java.lang.CharSequence#length()
- */
- public int length() {
- return getEndIndex() - getBeginIndex();
- }
-
- /**
- * {@inheritDoc}
- * <p>
- * Note that, if the document is modified concurrently, this method may
- * return {@link CharacterIterator#DONE} if a {@link BadLocationException}
- * was thrown when accessing the backing document.
- * </p>
- *
- * @param index
- * {@inheritDoc}
- * @return {@inheritDoc}
- */
- public char charAt(int index) {
- if (index >= 0 && index < length())
- try {
- return fDocument.getChar(getBeginIndex() + index);
- } catch (BadLocationException e) {
- // ignore and return DONE
- return DONE;
- }
- else
- throw new IndexOutOfBoundsException();
- }
-
- /*
- * @see java.lang.CharSequence#subSequence(int, int)
- */
- public CharSequence subSequence(int start, int end) {
- if (start < 0)
- throw new IndexOutOfBoundsException();
- if (end < start)
- throw new IndexOutOfBoundsException();
- if (end > length())
- throw new IndexOutOfBoundsException();
- return new DocumentCharacterIterator(fDocument,
- getBeginIndex() + start, getBeginIndex() + end);
- }
-}
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