--- /dev/null
+/*
+ * 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.
+ */
+
+package org.apache.lucene.analysis.compound.hyphenation;
+
+import java.io.Serializable;
+
+/**
+ * This class implements a simple char vector with access to the underlying
+ * array.
+ *
+ * This class has been taken from the Apache FOP project (http://xmlgraphics.apache.org/fop/). They have been slightly modified.
+ */
+public class CharVector implements Cloneable, Serializable {
+
+ /**
+ * Capacity increment size
+ */
+ private static final int DEFAULT_BLOCK_SIZE = 2048;
+
+ private int blockSize;
+
+ /**
+ * The encapsulated array
+ */
+ private char[] array;
+
+ /**
+ * Points to next free item
+ */
+ private int n;
+
+ public CharVector() {
+ this(DEFAULT_BLOCK_SIZE);
+ }
+
+ public CharVector(int capacity) {
+ if (capacity > 0) {
+ blockSize = capacity;
+ } else {
+ blockSize = DEFAULT_BLOCK_SIZE;
+ }
+ array = new char[blockSize];
+ n = 0;
+ }
+
+ public CharVector(char[] a) {
+ blockSize = DEFAULT_BLOCK_SIZE;
+ array = a;
+ n = a.length;
+ }
+
+ public CharVector(char[] a, int capacity) {
+ if (capacity > 0) {
+ blockSize = capacity;
+ } else {
+ blockSize = DEFAULT_BLOCK_SIZE;
+ }
+ array = a;
+ n = a.length;
+ }
+
+ /**
+ * Reset Vector but don't resize or clear elements
+ */
+ public void clear() {
+ n = 0;
+ }
+
+ @Override
+ public Object clone() {
+ CharVector cv = new CharVector(array.clone(), blockSize);
+ cv.n = this.n;
+ return cv;
+ }
+
+ public char[] getArray() {
+ return array;
+ }
+
+ /**
+ * return number of items in array
+ */
+ public int length() {
+ return n;
+ }
+
+ /**
+ * returns current capacity of array
+ */
+ public int capacity() {
+ return array.length;
+ }
+
+ public void put(int index, char val) {
+ array[index] = val;
+ }
+
+ public char get(int index) {
+ return array[index];
+ }
+
+ public int alloc(int size) {
+ int index = n;
+ int len = array.length;
+ if (n + size >= len) {
+ char[] aux = new char[len + blockSize];
+ System.arraycopy(array, 0, aux, 0, len);
+ array = aux;
+ }
+ n += size;
+ return index;
+ }
+
+ public void trimToSize() {
+ if (n < array.length) {
+ char[] aux = new char[n];
+ System.arraycopy(array, 0, aux, 0, n);
+ array = aux;
+ }
+ }
+
+}