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+/*
+ * Copyright (c) 2008-2010 Mozilla Foundation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+package nu.validator.htmlparser.impl;
+
+import nu.validator.htmlparser.annotation.NoLength;
+
+/**
+ * An UTF-16 buffer that knows the start and end indeces of its unconsumed
+ * content.
+ *
+ * @version $Id$
+ * @author hsivonen
+ */
+public final class UTF16Buffer {
+
+ /**
+ * The backing store of the buffer. May be larger than the logical content
+ * of this <code>UTF16Buffer</code>.
+ */
+ private final @NoLength char[] buffer;
+
+ /**
+ * The index of the first unconsumed character in the backing buffer.
+ */
+ private int start;
+
+ /**
+ * The index of the slot immediately after the last character in the backing
+ * buffer that is part of the logical content of this
+ * <code>UTF16Buffer</code>.
+ */
+ private int end;
+
+ //[NOCPP[
+
+ /**
+ * Constructor for wrapping an existing UTF-16 code unit array.
+ *
+ * @param buffer
+ * the backing buffer
+ * @param start
+ * the index of the first character to consume
+ * @param end
+ * the index immediately after the last character to consume
+ */
+ public UTF16Buffer(@NoLength char[] buffer, int start, int end) {
+ this.buffer = buffer;
+ this.start = start;
+ this.end = end;
+ }
+
+ // ]NOCPP]
+
+ /**
+ * Returns the start index.
+ *
+ * @return the start index
+ */
+ public int getStart() {
+ return start;
+ }
+
+ /**
+ * Sets the start index.
+ *
+ * @param start
+ * the start index
+ */
+ public void setStart(int start) {
+ this.start = start;
+ }
+
+ /**
+ * Returns the backing buffer.
+ *
+ * @return the backing buffer
+ */
+ public @NoLength char[] getBuffer() {
+ return buffer;
+ }
+
+ /**
+ * Returns the end index.
+ *
+ * @return the end index
+ */
+ public int getEnd() {
+ return end;
+ }
+
+ /**
+ * Checks if the buffer has data left.
+ *
+ * @return <code>true</code> if there's data left
+ */
+ public boolean hasMore() {
+ return start < end;
+ }
+
+ /**
+ * Returns <code>end - start</code>.
+ *
+ * @return <code>end - start</code>
+ */
+ public int getLength() {
+ return end - start;
+ }
+
+ /**
+ * Adjusts the start index to skip over the first character if it is a line
+ * feed and the previous character was a carriage return.
+ *
+ * @param lastWasCR
+ * whether the previous character was a carriage return
+ */
+ public void adjust(boolean lastWasCR) {
+ if (lastWasCR && buffer[start] == '\n') {
+ start++;
+ }
+ }
+
+ /**
+ * Sets the end index.
+ *
+ * @param end
+ * the end index
+ */
+ public void setEnd(int end) {
+ this.end = end;
+ }
+}