private void buildSwitchStatement(SwitchStatementTree tree) {
// FIXME useless node created for default cases.
SwitchStatementTree switchStatementTree = tree;
Block switchSuccessor = currentBlock;
// process condition
currentBlock = createBlock();
currentBlock.terminator = switchStatementTree;
switches.addLast(currentBlock);
build(switchStatementTree.expression());
// process body
currentBlock = createBlock(switchSuccessor);
breakTargets.addLast(switchSuccessor);
if (!switchStatementTree.cases().isEmpty()) {
CaseGroupTree firstCase = switchStatementTree.cases().get(0);
for (CaseGroupTree caseGroupTree : Lists.reverse(switchStatementTree.cases())) {
build(caseGroupTree.body());
switches.getLast().successors.add(currentBlock);
if (!caseGroupTree.equals(firstCase)) {
// No block predecessing the first case group.
currentBlock = createBlock(currentBlock);
}
}
}
breakTargets.removeLast();
// process condition
currentBlock = switches.removeLast();
}
private static CaseLabelTree getLastLabel(SwitchStatementTree switchStatementTree) {
if (!switchStatementTree.cases().isEmpty()) {
List<CaseLabelTree> labels =
switchStatementTree.cases().get(switchStatementTree.cases().size() - 1).labels();
if (!labels.isEmpty()) {
return labels.get(labels.size() - 1);
}
}
return null;
}
@Override
public void visitNode(Tree tree) {
SwitchStatementTree switchStatementTree = (SwitchStatementTree) tree;
CaseLabelTree defaultLabel = getDefaultLabel(switchStatementTree);
CaseLabelTree lastLabel = getLastLabel(switchStatementTree);
if (defaultLabel == null) {
reportIssue(switchStatementTree.switchKeyword(), "Add a default case to this switch.");
} else if (!defaultLabel.equals(lastLabel)) {
reportIssue(defaultLabel, "Move this default to the end of the switch.");
}
}
private static CaseLabelTree getDefaultLabel(SwitchStatementTree switchStatementTree) {
for (CaseGroupTree caseGroupTree : switchStatementTree.cases()) {
for (CaseLabelTree caseLabelTree : caseGroupTree.labels()) {
if (JavaKeyword.DEFAULT.getValue().equals(caseLabelTree.caseOrDefaultKeyword().text())) {
return caseLabelTree;
}
}
}
return null;
}
@Override
public void visitSwitchStatement(SwitchStatementTree tree) {
int count = 0;
for (CaseGroupTree caseGroup : tree.cases()) {
count += caseGroup.labels().size();
}
if (count < 3) {
context.addIssue(
tree,
ruleKey,
"Replace this \"switch\" statement by \"if\" statements to increase readability.");
}
super.visitSwitchStatement(tree);
}