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A packaging of the IntelliJ Community Edition groovy-psi library. This is release number 1 of trunk branch 142.
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/*
 * 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.impl;

import com.intellij.psi.*;
import com.intellij.psi.scope.PsiScopeProcessor;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.lang.psi.GroovyFile;
import org.jetbrains.plugins.groovy.lang.psi.GroovyFileBase;
import org.jetbrains.plugins.groovy.lang.psi.api.toplevel.imports.GrImportStatement;
import org.jetbrains.plugins.groovy.lang.resolve.DefaultImportContributor;
import org.jetbrains.plugins.groovy.lang.resolve.PackageSkippingProcessor;
import org.jetbrains.plugins.groovy.lang.resolve.ResolveUtil;
import org.jetbrains.plugins.groovy.lang.resolve.processors.ClassHint;

import java.util.LinkedHashSet;

/**
 * @author Max Medvedev
 */
public class GroovyImportHelper {
  public static boolean isImplicitlyImported(PsiElement element, String expectedName, GroovyFile file) {
    if (!(element instanceof PsiClass)) return false;

    final PsiClass psiClass = (PsiClass)element;
    if (!expectedName.equals(psiClass.getName())) return false;

    final String qname = psiClass.getQualifiedName();
    if (qname == null) return false;

    for (String importedClass : GroovyFileBase.IMPLICITLY_IMPORTED_CLASSES) {
      if (qname.equals(importedClass)) {
        return true;
      }
    }
    for (String pkg : getImplicitlyImportedPackages(file)) {
      if (qname.equals(pkg + "." + expectedName) || pkg.isEmpty() && qname.equals(expectedName)) {
        return true;
      }
    }
    return false;
  }

  public static LinkedHashSet getImplicitlyImportedPackages(@NotNull GroovyFile file) {
    final LinkedHashSet result = new LinkedHashSet();
    ContainerUtil.addAll(result, GroovyFileBase.IMPLICITLY_IMPORTED_PACKAGES);

    for (DefaultImportContributor contributor : DefaultImportContributor.EP_NAME.getExtensions()) {
      result.addAll(contributor.appendImplicitlyImportedPackages(file));
    }

    return result;
  }

  public static boolean processImports(@NotNull ResolveState state,
                                       @Nullable PsiElement lastParent,
                                       @NotNull PsiElement place,
                                       @NotNull PsiScopeProcessor importProcessor,
                                       @NotNull GrImportStatement[] importStatements,
                                       boolean shouldProcessOnDemand) {
    for (int i = importStatements.length - 1; i >= 0; i--) {
      final GrImportStatement imp = importStatements[i];
      if (shouldProcessOnDemand != imp.isOnDemand()) continue;
      if (!imp.processDeclarations(importProcessor, state, lastParent, place)) {
        return false;
      }
    }
    return true;
  }

  public static boolean processImplicitImports(@NotNull PsiScopeProcessor processor,
                                               @NotNull ResolveState state,
                                               @Nullable PsiElement lastParent,
                                               @NotNull PsiElement place,
                                               @NotNull GroovyFile file) {
    if (!ResolveUtil.shouldProcessClasses(processor.getHint(ClassHint.KEY))) return true;

    JavaPsiFacade facade = JavaPsiFacade.getInstance(file.getProject());

    final PsiScopeProcessor packageSkipper = new PackageSkippingProcessor(processor);

    for (final String implicitlyImported : getImplicitlyImportedPackages(file)) {
      PsiPackage aPackage = facade.findPackage(implicitlyImported);
      if (aPackage == null) continue;

      if (!aPackage.processDeclarations(packageSkipper, state, lastParent, place)) {
        return false;
      }
    }

    GroovyPsiManager groovyPsiManager = GroovyPsiManager.getInstance(file.getProject());
    for (String implicitlyImportedClass : GroovyFileBase.IMPLICITLY_IMPORTED_CLASSES) {
      PsiClass clazz = groovyPsiManager.findClassWithCache(implicitlyImportedClass, file.getResolveScope());
      if (clazz != null && !ResolveUtil.processElement(processor, clazz, state)) return false;
    }
    return true;
  }
}