java/java-analysis-impl/src/com/intellij/codeInsight/daemon/impl/quickfix/ConvertDoubleToFloatFix.java

/*
 * Copyright 2000-2012 JetBrains s.r.o.
 *
 * 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.intellij.codeInsight.daemon.impl.quickfix;

import com.intellij.codeInsight.daemon.impl.HighlightInfo;
import com.intellij.codeInsight.intention.IntentionAction;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.TextRange;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.*;
import com.intellij.psi.util.TypeConversionUtil;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * User: anna
 * Date: 2/10/12
 */
public class ConvertDoubleToFloatFix implements IntentionAction {
  private final PsiExpression myExpression;

  public ConvertDoubleToFloatFix(PsiExpression expression) {
    myExpression = expression;
  }

  @NotNull
  @Override
  public String getText() {
    return "Convert '" + myExpression.getText() + "' to float";
  }

  @NotNull
  @Override
  public String getFamilyName() {
    return getText();
  }

  @Override
  public boolean isAvailable(@NotNull Project project, Editor editor, PsiFile file) {
    if (myExpression.isValid()) {
      if (!StringUtil.endsWithIgnoreCase(myExpression.getText(), "f")) {
        final PsiLiteralExpression expression = (PsiLiteralExpression)createFloatingPointExpression(project);
        final Object value = expression.getValue();
        return value instanceof Float && !((Float)value).isInfinite() && !(((Float)value).floatValue() == 0 && !TypeConversionUtil.isFPZero(expression.getText()));
      }
    }
    return false;
  }

  @Override
  public void invoke(@NotNull Project project, Editor editor, PsiFile file) throws IncorrectOperationException {
    myExpression.replace(createFloatingPointExpression(project));
  }

  private PsiExpression createFloatingPointExpression(Project project) {
    final String text = myExpression.getText();
    if (StringUtil.endsWithIgnoreCase(text, "d")) {
      return JavaPsiFacade.getElementFactory(project).createExpressionFromText(text.substring(0, text.length() - 1) + "f", myExpression);
    } else {
      return JavaPsiFacade.getElementFactory(project).createExpressionFromText(text + "f", myExpression);
    }
  }

  @Override
  public boolean startInWriteAction() {
    return true;
  }

  public static void registerIntentions(@NotNull JavaResolveResult[] candidates,
                                        @NotNull PsiExpressionList list,
                                        @Nullable HighlightInfo highlightInfo,
                                        TextRange fixRange) {
    if (candidates.length == 0) return;
    PsiExpression[] expressions = list.getExpressions();
    for (JavaResolveResult candidate : candidates) {
      registerIntention(expressions, highlightInfo, fixRange, candidate, list);
    }
  }

  private static void registerIntention(@NotNull PsiExpression[] expressions,
                                        @Nullable HighlightInfo highlightInfo,
                                        TextRange fixRange,
                                        @NotNull JavaResolveResult candidate,
                                        @NotNull PsiElement context) {
    if (!candidate.isStaticsScopeCorrect()) return;
    PsiMethod method = (PsiMethod)candidate.getElement();
    if (method != null && context.getManager().isInProject(method)) {
      final PsiParameter[] parameters = method.getParameterList().getParameters();
      if (parameters.length == expressions.length) {
        for (int i = 0, length = parameters.length; i < length; i++) {
          PsiParameter parameter = parameters[i];
          final PsiExpression expression = expressions[i];
          if (expression instanceof PsiLiteralExpression && PsiType.FLOAT.equals(parameter.getType()) && PsiType.DOUBLE.equals(expression.getType())) {
            QuickFixAction.registerQuickFixAction(highlightInfo, fixRange, new ConvertDoubleToFloatFix(expression));
          }
        }
      }
    }
  }
}