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////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2017 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 com.puppycrawl.tools.checkstyle.api.DetailAST;
import com.puppycrawl.tools.checkstyle.api.TokenTypes;
/**
* Handler for try blocks.
*
* @author jrichard
*/
public class TryHandler extends BlockParentHandler {
/**
* Construct an instance of this handler with the given indentation check,
* abstract syntax tree, and parent handler.
*
* @param indentCheck the indentation check
* @param ast the abstract syntax tree
* @param parent the parent handler
*/
public TryHandler(IndentationCheck indentCheck,
DetailAST ast, AbstractExpressionHandler parent) {
super(indentCheck, "try", ast, parent);
}
/**
* Method to find left parenthesis of try with resources.
*
* @return DetailAst left parenthesis of try with resources
*/
private DetailAST getTryResLparen() {
return getMainAst().getFirstChild().getFirstChild();
}
/**
* Method to find right parenthesis of try with resources.
*
* @return DetailAst right parenthesis of try with resources
*/
private DetailAST getTryResRparen() {
return getMainAst().getFirstChild().getLastChild();
}
@Override
public IndentLevel getSuggestedChildIndent(AbstractExpressionHandler child) {
final IndentLevel result;
if (child instanceof CatchHandler
|| child instanceof FinallyHandler) {
result = getIndent();
}
else {
result = super.getSuggestedChildIndent(child);
}
return result;
}
@Override
public void checkIndentation() {
super.checkIndentation();
if (getMainAst().getFirstChild().getType() == TokenTypes.RESOURCE_SPECIFICATION) {
checkTryResParen(getTryResLparen(), "lparen");
checkTryResParen(getTryResRparen(), "rparen");
checkTryResources(getMainAst().getFirstChild());
}
}
/**
* Method to check the indentation of left paren or right paren.
* This method itself checks whether either of these are on start of line. This method
* takes care of line wrapping strict condition as well.
*
* @param parenAst lparen or rparen ast to check
* @param subType name to be used in log message
*/
private void checkTryResParen(final DetailAST parenAst,
final String subType) {
if (isOnStartOfLine(parenAst)) {
final IndentLevel expectedIdent = new IndentLevel(getIndent(), 0,
getIndentCheck().getLineWrappingIndentation());
checkChildIndentation(parenAst, subType, expectedIdent);
}
}
/**
* Method to check indentation of try resources children.
* It takes into account forceStrictCondition value when logging errors.
* Example of usage would include checking for try parenthesis and try resources.
*
* @param ast AST to check.
* @param subType String representing child type.
* @param expectedIdent Expected indent level.
*/
private void checkChildIndentation(DetailAST ast, String subType, IndentLevel expectedIdent) {
if (getIndentCheck().isForceStrictCondition()) {
if (!expectedIdent.isAcceptable(expandedTabsColumnNo(ast))) {
logError(ast, subType, expandedTabsColumnNo(ast), expectedIdent);
}
}
else {
if (expandedTabsColumnNo(ast) < expectedIdent.getFirstIndentLevel()) {
logError(ast, subType, expandedTabsColumnNo(ast), expectedIdent);
}
}
}
/**
* Checks indentation of resources parameters in try resources.
*
* @param resourcesSpecAst Resource specification ast
*/
private void checkTryResources(final DetailAST resourcesSpecAst) {
final DetailAST resourcesAst = resourcesSpecAst.findFirstToken(TokenTypes.RESOURCES);
final int indentation = getIndent().getFirstIndentLevel()
+ getIndentCheck().getLineWrappingIndentation();
final IndentLevel expectedResourceIndent = new IndentLevel(indentation);
final String subType = "resource";
DetailAST resourceAst = resourcesAst.getFirstChild();
while (resourceAst != null) {
if (resourceAst.getType() == TokenTypes.RESOURCE) {
final DetailAST nextSibling;
if (resourceAst.getNextSibling() == null) {
nextSibling = getTryResRparen();
}
else {
nextSibling = resourceAst.getNextSibling();
}
if (isOnStartOfLine(resourceAst)) {
checkChildIndentation(resourceAst, subType, expectedResourceIndent);
checkWrappingIndentation(
resourceAst,
nextSibling,
getIndentCheck().getLineWrappingIndentation(),
expectedResourceIndent.getFirstIndentLevel(),
true);
}
else {
checkWrappingIndentation(resourceAst, nextSibling);
}
}
resourceAst = resourceAst.getNextSibling();
}
}
}
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