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[COLLECTIONS-404] Make Snake an inner class of SequencesComparator.

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git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1476814 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Thomas Neidhart 2013-04-28 18:58:56 +00:00
parent 9ea429c977
commit e7ae9283ba
2 changed files with 71 additions and 106 deletions
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85
src/main/java/org/apache/commons/collections4/comparators/sequence/SequencesComparator.java
View File

@ -90,6 +90,25 @@ public class SequencesComparator<T> {
vUp = new int[size]; vUp = new int[size];
} }
/**
* Get the {@link EditScript} object.
* <p>
* It is guaranteed that the objects embedded in the {@link InsertCommand
* insert commands} come from the second sequence and that the objects
* embedded in either the {@link DeleteCommand delete commands} or
* {@link KeepCommand keep commands} come from the first sequence. This can
* be important if subclassing is used for some elements in the first
* sequence and the <code>equals</code> method is specialized.
*
* @return the edit script resulting from the comparison of the two
* sequences
*/
public EditScript<T> getScript() {
final EditScript<T> script = new EditScript<T>();
buildScript(0, sequence1.size(), 0, sequence2.size(), script);
return script;
}
/** /**
* Build a snake. * Build a snake.
* *
@ -250,22 +269,58 @@ public class SequencesComparator<T> {
} }
/** /**
* Get the {@link EditScript} object. * This class is a simple placeholder to hold the end part of a path
* <p> * under construction in a {@link SequencesComparator SequencesComparator}.
* It is guaranteed that the objects embedded in the {@link InsertCommand
* insert commands} come from the second sequence and that the objects
* embedded in either the {@link DeleteCommand delete commands} or
* {@link KeepCommand keep commands} come from the first sequence. This can
* be important if subclassing is used for some elements in the first
* sequence and the <code>equals</code> method is specialized.
*
* @return the edit script resulting from the comparison of the two
* sequences
*/ */
public EditScript<T> getScript() { private static class Snake {
final EditScript<T> script = new EditScript<T>();
buildScript(0, sequence1.size(), 0, sequence2.size(), script); /** Start index. */
return script; private final int start;
/** End index. */
private final int end;
/** Diagonal number. */
private final int diag;
/**
* Simple constructor. Creates a new instance of Snake with specified indices.
*
* @param start start index of the snake
* @param end end index of the snake
* @param diag diagonal number
*/
public Snake(final int start, final int end, final int diag) {
this.start = start;
this.end = end;
this.diag = diag;
} }
/**
* Get the start index of the snake.
*
* @return start index of the snake
*/
public int getStart() {
return start;
}
/**
* Get the end index of the snake.
*
* @return end index of the snake
*/
public int getEnd() {
return end;
}
/**
* Get the diagonal number of the snake.
*
* @return diagonal number of the snake
*/
public int getDiag() {
return diag;
}
}
} }

90
src/main/java/org/apache/commons/collections4/comparators/sequence/Snake.java
View File

@ -1,90 +0,0 @@
/*
* 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.commons.collections4.comparators.sequence;
/**
* This class is a simple placeholder to hold the end part of a path
* under construction in a {@link SequencesComparator SequencesComparator}.
* <p>
* A snake is an internal structure used in Eugene W. Myers algorithm
* (<a href="http://www.cis.upenn.edu/~bcpierce/courses/dd/papers/diff.ps">
* An O(ND) Difference Algorithm and Its Variations</a>).
*
* @since 4.0
* @version $Id$
*/
public class Snake {
/** Start index. */
private final int start;
/** End index. */
private final int end;
/** Diagonal number. */
private final int diag;
/**
* Simple constructor. Creates a new instance of Snake with default indices.
*/
public Snake() {
start = -1;
end = -1;
diag = 0;
}
/**
* Simple constructor. Creates a new instance of Snake with specified indices.
*
* @param start start index of the snake
* @param end end index of the snake
* @param diag diagonal number
*/
public Snake(final int start, final int end, final int diag) {
this.start = start;
this.end = end;
this.diag = diag;
}
/**
* Get the start index of the snake.
*
* @return start index of the snake
*/
public int getStart() {
return start;
}
/**
* Get the end index of the snake.
*
* @return end index of the snake
*/
public int getEnd() {
return end;
}
/**
* Get the diagonal number of the snake.
*
* @return diagonal number of the snake
*/
public int getDiag() {
return diag;
}
}