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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.util;

import com.intellij.openapi.diagnostic.Logger;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiMethod;
import org.jetbrains.annotations.Contract;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.GrTypeDefinition;

import static com.intellij.psi.PsiModifier.ABSTRACT;

/**
 * Created by Max Medvedev on 16/05/14
 */
public class GrTraitUtil {
  private static final Logger LOG = Logger.getInstance(GrTraitUtil.class);

  @Contract("null -> false")
  public static boolean isInterface(@Nullable PsiClass aClass) {
    return aClass != null && aClass.isInterface() && !isTrait(aClass);
  }

  public static boolean isMethodAbstract(PsiMethod method) {
    if (method.getModifierList().hasExplicitModifier(ABSTRACT)) return true;

    PsiClass aClass = method.getContainingClass();
    return isInterface(aClass);
  }

  @NotNull
  public static String getTraitFieldPrefix(@NotNull PsiClass aClass) {
    String qname = aClass.getQualifiedName();
    LOG.assertTrue(qname != null, aClass.getClass());

    String[] idents = qname.split("\\.");

    StringBuilder buffer = new StringBuilder();
    for (String ident : idents) {
      buffer.append(ident).append("_");
    }

    buffer.append("_");
    return buffer.toString();
  }

  @Contract("null -> false")
  public static boolean isTrait(@Nullable PsiClass containingClass) {
    return containingClass instanceof GrTypeDefinition && ((GrTypeDefinition)containingClass).isTrait();
  }
}