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/*
* Copyright 2003-2013 Dave Griffith, Bas Leijdekkers
*
* Licensed 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 com.siyeh.ipp.equality;
import com.intellij.psi.*;
import com.intellij.psi.tree.IElementType;
import com.intellij.util.IncorrectOperationException;
import com.siyeh.ig.PsiReplacementUtil;
import com.siyeh.ig.psiutils.ParenthesesUtils;
import com.siyeh.ipp.base.Intention;
import com.siyeh.ipp.base.PsiElementPredicate;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
public class ReplaceEqualityWithSafeEqualsIntention extends Intention {
@NotNull
public PsiElementPredicate getElementPredicate() {
return new ObjectEqualityPredicate();
}
public void processIntention(PsiElement element)
throws IncorrectOperationException {
final PsiBinaryExpression exp =
(PsiBinaryExpression)element;
final PsiExpression lhs = exp.getLOperand();
final PsiExpression rhs = exp.getROperand();
if (rhs == null) {
return;
}
final PsiExpression strippedLhs =
ParenthesesUtils.stripParentheses(lhs);
if (strippedLhs == null) {
return;
}
final PsiExpression strippedRhs =
ParenthesesUtils.stripParentheses(rhs);
if (strippedRhs == null) {
return;
}
final String lhsText = strippedLhs.getText();
final String rhsText = strippedRhs.getText();
final PsiJavaToken operationSign = exp.getOperationSign();
final IElementType tokenType = operationSign.getTokenType();
final String signText = operationSign.getText();
@NonNls final StringBuilder buffer = new StringBuilder(lhsText);
buffer.append("==null?");
buffer.append(rhsText);
buffer.append(signText);
buffer.append(" null:");
if (tokenType.equals(JavaTokenType.NE)) {
buffer.append('!');
}
if (ParenthesesUtils.getPrecedence(strippedLhs) >
ParenthesesUtils.METHOD_CALL_PRECEDENCE) {
buffer.append('(');
buffer.append(lhsText);
buffer.append(')');
}
else {
buffer.append(lhsText);
}
buffer.append(".equals(");
buffer.append(rhsText);
buffer.append(')');
PsiReplacementUtil.replaceExpression(exp, buffer.toString());
}
}
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