1 files changed, 180 insertions, 0 deletions
diff --git a/org.eclipse.jdt.core.manipulation/common/org/eclipse/jdt/internal/ui/text/SequenceCharacterIterator.java b/org.eclipse.jdt.core.manipulation/common/org/eclipse/jdt/internal/ui/text/SequenceCharacterIterator.java
new file mode 100644
index 0000000000..8e3e1c194e
--- /dev/null
+++ b/org.eclipse.jdt.core.manipulation/common/org/eclipse/jdt/internal/ui/text/SequenceCharacterIterator.java
@@ -0,0 +1,180 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jdt.internal.ui.text;
+
+import java.text.CharacterIterator;
+
+import org.eclipse.core.runtime.Assert;
+
+
+
+/**
+ * A <code>CharSequence</code> based implementation of <code>CharacterIterator</code>.
+ *
+ * @since 3.0
+ */
+public class SequenceCharacterIterator implements CharacterIterator {
+
+	private int fIndex= -1;
+	private final CharSequence fSequence;
+	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 sequence.
+	 *
+	 * @param sequence the sequence backing this iterator
+	 */
+	public SequenceCharacterIterator(CharSequence sequence) {
+		this(sequence, 0);
+	}
+
+	/**
+	 * Creates an iterator.
+	 *
+	 * @param sequence the sequence backing this iterator
+	 * @param first the first character to consider
+	 * @throws IllegalArgumentException if the indices are out of bounds
+	 */
+	public SequenceCharacterIterator(CharSequence sequence, int first) throws IllegalArgumentException {
+		this(sequence, first, sequence.length());
+	}
+
+	/**
+	 * Creates an iterator.
+	 *
+	 * @param sequence the sequence 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 SequenceCharacterIterator(CharSequence sequence, int first, int last) throws IllegalArgumentException {
+		if (sequence == null)
+			throw new NullPointerException();
+		if (first < 0 || first > last)
+			throw new IllegalArgumentException();
+		if (last > sequence.length())
+			throw new IllegalArgumentException();
+		fSequence= sequence;
+		fFirst= first;
+		fLast= last;
+		fIndex= first;
+		invariant();
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#first()
+	 */
+	@Override
+	public char first() {
+		return setIndex(getBeginIndex());
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#last()
+	 */
+	@Override
+	public char last() {
+		if (fFirst == fLast)
+			return setIndex(getEndIndex());
+		else
+			return setIndex(getEndIndex() - 1);
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#current()
+	 */
+	@Override
+	public char current() {
+		if (fIndex >= fFirst && fIndex < fLast)
+			return fSequence.charAt(fIndex);
+		else
+			return DONE;
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#next()
+	 */
+	@Override
+	public char next() {
+		return setIndex(Math.min(fIndex + 1, getEndIndex()));
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#previous()
+	 */
+	@Override
+	public char previous() {
+		if (fIndex > getBeginIndex()) {
+			return setIndex(fIndex - 1);
+		} else {
+			return DONE;
+		}
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#setIndex(int)
+	 */
+	@Override
+	public char setIndex(int position) {
+		if (position >= getBeginIndex() && position <= getEndIndex())
+			fIndex= position;
+		else
+			throw new IllegalArgumentException();
+
+		invariant();
+		return current();
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#getBeginIndex()
+	 */
+	@Override
+	public int getBeginIndex() {
+		return fFirst;
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#getEndIndex()
+	 */
+	@Override
+	public int getEndIndex() {
+		return fLast;
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#getIndex()
+	 */
+	@Override
+	public int getIndex() {
+		return fIndex;
+	}
+
+	/*
+	 * @see java.text.CharacterIterator#clone()
+	 */
+	@Override
+	public Object clone() {
+		try {
+			return super.clone();
+		} catch (CloneNotSupportedException e) {
+			throw new InternalError();
+		}
+	}
+}