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Checkstyle is a development tool to help programmers write Java code
that adheres to a coding standard
////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2020 the original author or authors.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
////////////////////////////////////////////////////////////////////////////////
package com.puppycrawl.tools.checkstyle.checks.indentation;
import java.util.BitSet;
/**
* Encapsulates representation of notion of expected indentation levels.
* Provide a way to have multiple acceptable levels.
* This class is immutable.
*/
public class IndentLevel {
/** Set of acceptable indentation levels. */
private final BitSet levels = new BitSet();
/**
* Creates new instance with one acceptable indentation level.
* @param indent acceptable indentation level.
*/
public IndentLevel(int indent) {
levels.set(indent);
}
/**
* Creates new instance for nested structure.
* @param base parent's level
* @param offsets offsets from parent's level.
*/
public IndentLevel(IndentLevel base, int... offsets) {
final BitSet src = base.levels;
for (int i = src.nextSetBit(0); i >= 0; i = src.nextSetBit(i + 1)) {
for (int offset : offsets) {
levels.set(i + offset);
}
}
}
/**
* Creates new instance with no acceptable indentation level.
* This is only used internally to combine multiple levels.
*/
private IndentLevel() {
}
/**
* Checks whether we have more than one level.
* @return whether we have more than one level.
*/
public final boolean isMultiLevel() {
return levels.cardinality() > 1;
}
/**
* Checks if given indentation is acceptable.
* @param indent indentation to check.
* @return true if given indentation is acceptable,
* false otherwise.
*/
public boolean isAcceptable(int indent) {
return levels.get(indent);
}
/**
* Returns true if indent less than minimal of
* acceptable indentation levels, false otherwise.
* @param indent indentation to check.
* @return true if {@code indent} less than minimal of
* acceptable indentation levels, false otherwise.
*/
public boolean isGreaterThan(int indent) {
return levels.nextSetBit(0) > indent;
}
/**
* Adds one or more acceptable indentation level.
* @param base class to add new indentations to.
* @param additions new acceptable indentation.
* @return New acceptable indentation level instance.
*/
public static IndentLevel addAcceptable(IndentLevel base, int... additions) {
final IndentLevel result = new IndentLevel();
result.levels.or(base.levels);
for (int addition : additions) {
result.levels.set(addition);
}
return result;
}
/**
* Combines 2 acceptable indentation level classes.
* @param base class to add new indentations to.
* @param addition new acceptable indentation.
* @return New acceptable indentation level instance.
*/
public static IndentLevel addAcceptable(IndentLevel base, IndentLevel addition) {
final IndentLevel result = new IndentLevel();
result.levels.or(base.levels);
result.levels.or(addition.levels);
return result;
}
/**
* Returns first indentation level.
* @return indentation level.
*/
public int getFirstIndentLevel() {
return levels.nextSetBit(0);
}
/**
* Returns last indentation level.
* @return indentation level.
*/
public int getLastIndentLevel() {
return levels.length() - 1;
}
@Override
public String toString() {
final String result;
if (levels.cardinality() == 1) {
result = String.valueOf(levels.nextSetBit(0));
}
else {
final StringBuilder sb = new StringBuilder(50);
for (int i = levels.nextSetBit(0); i >= 0;
i = levels.nextSetBit(i + 1)) {
if (sb.length() > 0) {
sb.append(", ");
}
sb.append(i);
}
result = sb.toString();
}
return result;
}
}