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package org.apache.lucene.facet.taxonomy.writercache.cl2o;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.OutputStream;
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import java.io.Serializable;
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import java.util.ArrayList;
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import java.util.List;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* Similar to {@link StringBuilder}, but with a more efficient growing strategy.
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* This class uses char array blocks to grow.
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* @lucene.experimental
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class CharBlockArray implements Appendable, Serializable, CharSequence {
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private static final long serialVersionUID = 1L;
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private final static int DefaultBlockSize = 32 * 1024; // 32 KB default size
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final static class Block implements Serializable, Cloneable {
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private static final long serialVersionUID = 1L;
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this.chars = new char[size];
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this(DefaultBlockSize);
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CharBlockArray(int blockSize) {
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this.blocks = new ArrayList<Block>();
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this.blockSize = blockSize;
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private void addBlock() {
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this.current = new Block(this.blockSize);
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this.blocks.add(this.current);
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int blockIndex(int index) {
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return index / blockSize;
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int indexInBlock(int index) {
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return index % blockSize;
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public CharBlockArray append(CharSequence chars) {
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return append(chars, 0, chars.length());
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public CharBlockArray append(char c) {
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if (this.current.length == this.blockSize) {
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this.current.chars[this.current.length++] = c;
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public CharBlockArray append(CharSequence chars, int start, int length) {
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int end = start + length;
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for (int i = start; i < end; i++) {
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append(chars.charAt(i));
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public CharBlockArray append(char[] chars, int start, int length) {
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if (this.current.length == this.blockSize) {
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int remainingInBlock = this.blockSize - this.current.length;
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if (remainingInBlock < toCopy) {
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toCopy = remainingInBlock;
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System.arraycopy(chars, offset, this.current.chars, this.current.length, toCopy);
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this.current.length += toCopy;
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this.length += length;
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public CharBlockArray append(String s) {
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int remain = s.length();
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if (this.current.length == this.blockSize) {
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int remainingInBlock = this.blockSize - this.current.length;
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if (remainingInBlock < toCopy) {
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toCopy = remainingInBlock;
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s.getChars(offset, offset + toCopy, this.current.chars, this.current.length);
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this.current.length += toCopy;
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this.length += s.length();
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public char charAt(int index) {
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Block b = this.blocks.get(blockIndex(index));
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return b.chars[indexInBlock(index)];
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public int length() {
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public CharSequence subSequence(int start, int end) {
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throw new UnsupportedOperationException("subsequence not implemented yet");
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public String toString() {
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StringBuilder b = new StringBuilder(blockSize * this.blocks.size());
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for (int i = 0; i < this.blocks.size(); i++) {
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b.append(this.blocks.get(i).chars);
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void flush(OutputStream out) throws IOException {
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ObjectOutputStream oos = null;
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oos = new ObjectOutputStream(out);
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oos.writeObject(this);
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public static CharBlockArray open(InputStream in) throws IOException, ClassNotFoundException {
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ObjectInputStream ois = null;
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ois = new ObjectInputStream(in);
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CharBlockArray a = (CharBlockArray) ois.readObject();