plugins/groovy/src/org/jetbrains/plugins/groovy/codeInspection/bugs/AddMethodFix.java

/*
 * Copyright 2000-2014 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 org.jetbrains.plugins.groovy.codeInspection.bugs;

import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.ide.fileTemplates.FileTemplate;
import com.intellij.ide.fileTemplates.FileTemplateManager;
import com.intellij.ide.fileTemplates.JavaTemplateUtil;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.JavaPsiFacade;
import com.intellij.psi.PsiTypeParameter;
import com.intellij.psi.util.PsiTypesUtil;
import com.intellij.util.ArrayUtil;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.plugins.groovy.codeInspection.GroovyFix;
import org.jetbrains.plugins.groovy.codeInspection.GroovyInspectionBundle;
import org.jetbrains.plugins.groovy.lang.psi.GroovyPsiElementFactory;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.blocks.GrCodeBlock;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.GrTypeDefinition;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.members.GrMethod;

import java.io.IOException;
import java.util.Properties;

public class AddMethodFix extends GroovyFix {
  private static final Logger LOG = Logger.getInstance("#org.jetbrains.plugins.groovy.codeInspection.bugs.GroovyRangeTypeCheckInspection");
  private final String myMethodName;
  private final GrTypeDefinition myClass;

  public AddMethodFix(String methodName, GrTypeDefinition aClass) {
    myMethodName = methodName;
    myClass = aClass;
  }

  @Override
  protected void doFix(Project project, ProblemDescriptor descriptor) throws IncorrectOperationException {

    if (myClass.isInterface()) {
      final GrMethod method = GroovyPsiElementFactory.getInstance(project)
        .createMethodFromText("def " + myClass.getName() + " " + myMethodName + "();");
      myClass.add(method);
    }
    else {
      String templName = JavaTemplateUtil.TEMPLATE_IMPLEMENTED_METHOD_BODY;
      final FileTemplate template = FileTemplateManager.getInstance().getCodeTemplate(templName);

      Properties properties = new Properties();

      String returnType = generateTypeText(myClass);
      properties.setProperty(FileTemplate.ATTRIBUTE_RETURN_TYPE, returnType);
      properties.setProperty(FileTemplate.ATTRIBUTE_DEFAULT_RETURN_VALUE,
                             PsiTypesUtil.getDefaultValueOfType(JavaPsiFacade.getElementFactory(project).createType(myClass)));
      properties.setProperty(FileTemplate.ATTRIBUTE_CALL_SUPER, "");
      properties.setProperty(FileTemplate.ATTRIBUTE_CLASS_NAME, myClass.getQualifiedName());
      properties.setProperty(FileTemplate.ATTRIBUTE_SIMPLE_CLASS_NAME, myClass.getName());
      properties.setProperty(FileTemplate.ATTRIBUTE_METHOD_NAME, myMethodName);

      try {
        String bodyText = StringUtil.replace(template.getText(properties), ";", "");
        final GrCodeBlock newBody = GroovyPsiElementFactory.getInstance(project).createMethodBodyFromText("\n" + bodyText + "\n");

        final GrMethod method = GroovyPsiElementFactory.getInstance(project)
          .createMethodFromText("", myMethodName, returnType, ArrayUtil.EMPTY_STRING_ARRAY, myClass);
        method.setBlock(newBody);
        myClass.add(method);
      }
      catch (IOException e) {
        LOG.error(e);
      }
    }
  }


  @NotNull
  @Override
  public String getName() {
    return GroovyInspectionBundle.message("add.method", myMethodName, myClass.getName());
  }

  static String generateTypeText(GrTypeDefinition aClass) {
    StringBuilder returnType = new StringBuilder(aClass.getName());
    final PsiTypeParameter[] typeParameters = aClass.getTypeParameters();
    if (typeParameters.length > 0) {
      returnType.append('<');
      for (PsiTypeParameter typeParameter : typeParameters) {
        returnType.append(typeParameter.getName()).append(", ");
      }
      returnType.replace(returnType.length() - 2, returnType.length(), ">");
    }
    return returnType.toString();
  }
}