com.qulice.checkstyle.NonStaticMethodCheck Maven / Gradle / Ivy
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package com.qulice.checkstyle;
import com.puppycrawl.tools.checkstyle.api.Check;
import com.puppycrawl.tools.checkstyle.api.DetailAST;
import com.puppycrawl.tools.checkstyle.api.TokenTypes;
import java.util.regex.Pattern;
/**
* Checks that non static method must contain at least one reference to
* {@code this}.
*
* If your method doesn't need {@code this} than why it is not
* {@code static}?
*
* @author Dmitry Bashkin ([email protected])
* @author Yegor Bugayenko ([email protected])
* @author Paul Polishchuk ([email protected])
* @version $Id$
*/
public final class NonStaticMethodCheck extends Check {
/**
* Files to exclude from this check.
* This is mostly to exclude JUnit tests.
*/
private transient Pattern exclude = Pattern.compile("^$");
/**
* Exclude files matching given pattern.
* @param excl Regexp of classes to exclude.
*/
public void setExcludeFileNamePattern(final String excl) {
this.exclude = Pattern.compile(excl);
}
@Override
public int[] getDefaultTokens() {
return new int[] {
TokenTypes.METHOD_DEF,
};
}
@Override
public void visitToken(final DetailAST ast) {
if (this.exclude.matcher(this.getFileContents().getFilename())
.find()) {
return;
}
if (TokenTypes.CLASS_DEF == ast.getParent().getParent().getType()) {
this.checkClassMethod(ast);
}
}
/**
* Check that non static class method refer \"this\".
* @param method DetailAST of method
*/
private void checkClassMethod(final DetailAST method) {
final DetailAST modifiers = method
.findFirstToken(TokenTypes.MODIFIERS);
if (modifiers.findFirstToken(TokenTypes.LITERAL_STATIC) != null) {
return;
}
if (!method.branchContains(TokenTypes.LITERAL_THIS)) {
final int line = method.getLineNo();
this.log(
line,
// @checkstyle LineLength (1 line)
"This method must be static, because it does not refer to \"this\""
);
}
}
}