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Ternary Search Tree
/*
* @(#)$Id$
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed 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.
*
* Contributors:
* Makoto YUI - initial implementation
*/
//package xbird.util.string;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.oreilly.com/catalog/javapt2/
*/
public class TernarySearchTree {
private static final int LOW_OFFSET = 1;
private static final int HIGH_OFFSET = 2;
private static final int EQUAL_OFFSET = 3;
private static final int VALUE_OFFSET = 4;
private static final int NODE_SIZE = 5;
static final int INITIAL_TRIE_NODE = 1 + NODE_SIZE;
static final int INITIAL_NODE = 1;
static final int TRIE_CHAR_SIZE = 256;
char[] buff_ = new char[5000];
int[] nodes_;
Object[] objects_;
int nextNode_ = INITIAL_TRIE_NODE;
int nextObject_ = 0;
int initial_ = -1;
Object[] trie1Objects_;
int[][] trie2_;
Object[][] trie2Objects_;
public TernarySearchTree() {
this(200000);
}
public TernarySearchTree(int size) {
trie1Objects_ = new Object[TRIE_CHAR_SIZE];
trie2_ = new int[TRIE_CHAR_SIZE][TRIE_CHAR_SIZE];
trie2Objects_ = new Object[TRIE_CHAR_SIZE][TRIE_CHAR_SIZE];
nodes_ = new int[NODE_SIZE * size + 1];
objects_ = new Object[size];
}
public Object get(String key) {
int len = key.length();
key.getChars(0, len, buff_, 0);
int first = buff_[0];
int second = buff_[1];
if(len == 1 && (first < TRIE_CHAR_SIZE)) {
return trie1Objects_[first];
} else if(len == 2 && (first < TRIE_CHAR_SIZE) && (second < TRIE_CHAR_SIZE)) {
return trie2Objects_[first][second];
} else if((first < TRIE_CHAR_SIZE) && (second < TRIE_CHAR_SIZE)) {
int nodep = trie2_[first][second];
if(nodep == 0) {
return null;
}
return search(buff_, 2, len - 1, nodep);
} else {
//Use node[0] as a flag to determine if enetered here
if(nodes_[0] == 0) {
return null;
}
return search(buff_, 0, len - 1, INITIAL_NODE);
}
}
public Object put(String key, Object value) {
int len = key.length();
key.getChars(0, len, buff_, 0);
int first = buff_[0];
int second = buff_[1];
if(len == 1 && (first < TRIE_CHAR_SIZE)) {
Object old = trie1Objects_[first];
trie1Objects_[first] = value;
return old;
} else if(len == 2 && (first < TRIE_CHAR_SIZE) && (second < TRIE_CHAR_SIZE)) {
Object old = trie2Objects_[first][second];
trie2Objects_[first][second] = value;
return old;
} else if((first < TRIE_CHAR_SIZE) && (second < TRIE_CHAR_SIZE)) {
int nodep = trie2_[first][second];
if(nodep == 0) {
nodep = trie2_[first][second] = nextNode_;
nodes_[nextNode_] = buff_[2];
nextNode_ += NODE_SIZE;
}
return insert(buff_, 2, len - 1, value, nodep);
} else {
//Use node[0] as a flag to determine if enetered here
if(nodes_[0] == 0) {
nodes_[0] = 1;
nodes_[INITIAL_NODE] = first;
}
return insert(buff_, 0, len - 1, value, INITIAL_NODE);
}
}
public Object search(char[] str, int strIdx, int strMaxIdx, int p) {
int c;
while(p != 0) {
if((c = str[strIdx]) < nodes_[p])
p = nodes_[p + LOW_OFFSET];
else if(c == nodes_[p]) {
if(strIdx == strMaxIdx)
return objects_[nodes_[p + VALUE_OFFSET]];
else {
strIdx++;
p = nodes_[p + EQUAL_OFFSET];
}
} else
p = nodes_[p + HIGH_OFFSET];
}
return null;
}
public Object insert(char[] str, int strIdx, int strMaxIdx, Object value, int p) {
int c = str[strIdx];
int cdiff;
Object old;
for(;;) {
if((cdiff = c - nodes_[p]) < 0) {
if(nodes_[p + LOW_OFFSET] == 0) {
nodes_[p + LOW_OFFSET] = nextNode_;
nodes_[nextNode_] = c;
nextNode_ += NODE_SIZE;
}
p = nodes_[p + LOW_OFFSET];
} else if(cdiff == 0) {
if(strIdx == strMaxIdx) {
if(nodes_[p + VALUE_OFFSET] == 0) {
nodes_[p + VALUE_OFFSET] = nextObject_;
nextObject_++;
}
old = objects_[nodes_[p + VALUE_OFFSET]];
objects_[nodes_[p + VALUE_OFFSET]] = value;
return old;
} else {
strIdx++;
c = str[strIdx];
if(nodes_[p + EQUAL_OFFSET] == 0) {
nodes_[p + EQUAL_OFFSET] = nextNode_;
nodes_[nextNode_] = c;
nextNode_ += NODE_SIZE;
}
p = nodes_[p + EQUAL_OFFSET];
}
} else {
if(nodes_[p + HIGH_OFFSET] == 0) {
nodes_[p + HIGH_OFFSET] = nextNode_;
nodes_[nextNode_] = c;
nextNode_ += NODE_SIZE;
}
p = nodes_[p + HIGH_OFFSET];
}
}
}
public int nodeCount() {
return (nextNode_ - INITIAL_NODE + 1) / NODE_SIZE;
}
public void release() {
nodes_ = null;
objects_ = null;
}
}
