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[BAEL-3480] - Java Fast pattern matching using trie and suffix tree

This commit is contained in:
macroscopic64 2020-02-23 20:55:32 +05:30
parent 43a19207c8
commit 57470cdc1d
2 changed files with 13 additions and 17 deletions
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17
algorithms-searching/src/main/java/com/baeldung/algorithms/suffixtree/SuffixTree.java
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@ -14,16 +14,12 @@ public class SuffixTree {
private Node root;
private String fullText;
public SuffixTree() {
public SuffixTree(String text) {
root = new Node("", POSITION_UNDEFINED);
fullText = "";
}
public void addText(String text) {
for (int i = 0; i < text.length(); i++) {
addSuffix(text.substring(i) + WORD_TERMINATION, i);
}
fullText += text;
fullText = text;
}
public List<String> searchText(String pattern) {
@ -151,8 +147,9 @@ public class SuffixTree {
int compareLength = Math.min(nodeText.length(), pattern.length());
for (int j = 1; j < compareLength; j++) {
if (pattern.charAt(j) != nodeText.charAt(j)) {
if (isAllowPartialMatch)
if (isAllowPartialMatch) {
nodes.add(currentNode);
}
return nodes;
}
}
@ -160,11 +157,11 @@ public class SuffixTree {
nodes.add(currentNode);
if (pattern.length() > compareLength) {
List<Node> nodes2 = getAllNodesInTraversePath(pattern.substring(compareLength), currentNode, isAllowPartialMatch);
if (nodes2.size() == 0 && !isAllowPartialMatch) {
if (nodes2.size() > 0) {
nodes.addAll(nodes2);
} else if (!isAllowPartialMatch) {
nodes.add(null);
return nodes;
}
nodes.addAll(nodes2);
}
return nodes;
}

13
algorithms-searching/src/test/java/com/baeldung/algorithms/suffixtree/SuffixTreeUnitTest.java
View File

@ -16,8 +16,7 @@ public class SuffixTreeUnitTest {
@BeforeClass
public static void setUp() {
suffixTree = new SuffixTree();
suffixTree.addText("bananabanana");
suffixTree = new SuffixTree("havanabanana");
printTree();
}
@ -26,7 +25,7 @@ public class SuffixTreeUnitTest {
List<String> matches = suffixTree.searchText("a");
matches.stream()
.forEach(m -> LOGGER.info(m));
Assert.assertArrayEquals(new String[] { "b[a]nanabanana", "ban[a]nabanana", "banan[a]banana", "bananab[a]nana", "bananaban[a]na", "bananabanan[a]" }, matches.toArray());
Assert.assertArrayEquals(new String[] { "h[a]vanabanana", "hav[a]nabanana", "havan[a]banana", "havanab[a]nana", "havanaban[a]na", "havanabanan[a]" }, matches.toArray());
}
@Test
@ -34,7 +33,7 @@ public class SuffixTreeUnitTest {
List<String> matches = suffixTree.searchText("nab");
matches.stream()
.forEach(m -> LOGGER.info(m));
Assert.assertArrayEquals(new String[] { "bana[nab]anana" }, matches.toArray());
Assert.assertArrayEquals(new String[] { "hava[nab]anana" }, matches.toArray());
}
@Test
@ -47,10 +46,10 @@ public class SuffixTreeUnitTest {
@Test
public void givenSuffixTree_whenSearchingForBanana_thenReturn2Matches() {
List<String> matches = suffixTree.searchText("banana");
List<String> matches = suffixTree.searchText("ana");
matches.stream()
.forEach(m -> LOGGER.info(m));
Assert.assertArrayEquals(new String[] { "[banana]banana", "banana[banana]" }, matches.toArray());
Assert.assertArrayEquals(new String[] { "hav[ana]banana", "havanab[ana]na", "havanaban[ana]" }, matches.toArray());
}
@Test
@ -58,7 +57,7 @@ public class SuffixTreeUnitTest {
List<String> matches = suffixTree.searchText("na");
matches.stream()
.forEach(m -> LOGGER.info(m));
Assert.assertArrayEquals(new String[] { "ba[na]nabanana", "bana[na]banana", "bananaba[na]na", "bananabana[na]" }, matches.toArray());
Assert.assertArrayEquals(new String[] { "hava[na]banana", "havanaba[na]na", "havanabana[na]" }, matches.toArray());
}
@Test