plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/typeEnhancers/FromStringHintProcessor.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.lang.psi.typeEnhancers;

import com.intellij.psi.*;
import com.intellij.util.Function;
import com.intellij.util.IncorrectOperationException;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;

import java.util.List;

/**
 * Created by Max Medvedev on 28/02/14
 */
public class FromStringHintProcessor extends SignatureHintProcessor {

  @Override
  public String getHintName() {
    return "groovy.transform.stc.FromString";
  }

  @NotNull
  @Override
  public List<PsiType[]> inferExpectedSignatures(@NotNull final PsiMethod method,
                                                 @NotNull final PsiSubstitutor substitutor,
                                                 @NotNull String[] options) {
    return ContainerUtil.map(options, new Function<String, PsiType[]>() {
      @Override
      public PsiType[] fun(String value) {
          String[] params = value.split(",");
          return ContainerUtil.map(params, new Function<String, PsiType>() {
            @Override
            public PsiType fun(String param) {
              try {
                PsiTypeParameterList typeParameterList = method.getTypeParameterList();
                PsiElement context = typeParameterList != null ? typeParameterList : method;
                PsiType original = JavaPsiFacade.getElementFactory(method.getProject()).createTypeFromText(param, context);
                return substitutor.substitute(original);
              }
              catch (IncorrectOperationException e) {
                //do nothing. Just don't throw an exception
              }
              return PsiType.NULL;
            }
          }, new PsiType[params.length]);
      }
    });
  }
}