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/*
 * LingPipe v. 4.1.0
 * Copyright (C) 2003-2011 Alias-i
 *
 * This program is licensed under the Alias-i Royalty Free License
 * Version 1 WITHOUT ANY WARRANTY, without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the Alias-i
 * Royalty Free License Version 1 for more details.
 *
 * You should have received a copy of the Alias-i Royalty Free License
 * Version 1 along with this program; if not, visit
 * http://alias-i.com/lingpipe/licenses/lingpipe-license-1.txt or contact
 * Alias-i, Inc. at 181 North 11th Street, Suite 401, Brooklyn, NY 11211,
 * +1 (718) 290-9170.
 */

package com.aliasi.lm;

import com.aliasi.io.BitInput;

import java.io.IOException;

/**
 * A BitTrieReader provides a trie reader that wraps a
 * bit-level input.  
 *
 * 

The encoding is discussed in the class * documentation for the corresponding writer, {@link BitTrieWriter}. * * @author Bob Carpenter * @version 2.3 * @since LingPipe2.3 */ public class BitTrieReader extends BitTrie implements TrieReader { private final BitInput mBitInput; /** * Construct a bit trie reader from the specified bit input. * * @param bitInput Bit input from which to read the trie. */ public BitTrieReader(BitInput bitInput) { mBitInput = bitInput; } /** * Read and return the next count from the underlying bit input. * * @return The next count. * @throws IOException If there is an underlying I/O error. */ public long readCount() throws IOException { long count = mBitInput.readDelta(); // System.out.println("CODE:" + count); pushValue(-1L); // System.out.println("Read count=" + count); return count; } /** * Read and return the next symbol from the underlying bit input. * Returns -1 if there are no more daughters to * read in the current trie node. * * @return The next count. * @throws IOException If there is an underlying I/O error. */ public long readSymbol() throws IOException { long n = mBitInput.readDelta(); // System.out.println("CODE:" + n); if (n == 1L) { popValue(); // System.out.println("Read symbl=-1"); return -1L; } long sym = n + popValue() - 1L; // System.out.println("Read symbol=" + sym); pushValue(sym); return sym; } }





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