python/psi-api/src/com/jetbrains/python/psi/resolve/PyResolveContext.java

/*
 * Copyright 2000-2013 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.jetbrains.python.psi.resolve;

import com.jetbrains.python.psi.types.TypeEvalContext;
import org.jetbrains.annotations.NotNull;

/**
 * @author yole
 */
public class PyResolveContext {
  private final boolean myAllowImplicits;
  private final boolean myAllowProperties;
  private final TypeEvalContext myTypeEvalContext;

  private PyResolveContext(boolean allowImplicits, boolean allowProperties) {
    myAllowImplicits = allowImplicits;
    myAllowProperties = allowProperties;
    myTypeEvalContext = null;
  }

  private PyResolveContext(boolean allowImplicits, boolean allowProperties, TypeEvalContext typeEvalContext) {
    myAllowImplicits = allowImplicits;
    myAllowProperties = allowProperties;
    myTypeEvalContext = typeEvalContext;
  }

  public boolean allowImplicits() {
    return myAllowImplicits;
  }

  public boolean allowProperties() {
    return myAllowProperties;
  }

  private static final PyResolveContext ourDefaultContext = new PyResolveContext(true, true);
  private static final PyResolveContext ourNoImplicitsContext = new PyResolveContext(false, true);
  private static final PyResolveContext ourNoPropertiesContext = new PyResolveContext(false, false);

  public static PyResolveContext defaultContext() {
    return ourDefaultContext;
  }

  public static PyResolveContext noImplicits() {
    return ourNoImplicitsContext;
  }

  public static PyResolveContext noProperties() {
    return ourNoPropertiesContext;
  }

  public PyResolveContext withTypeEvalContext(@NotNull TypeEvalContext context) {
    return new PyResolveContext(myAllowImplicits, myAllowProperties, context);
  }

  public PyResolveContext withoutImplicits() {
    return new PyResolveContext(false, myAllowProperties, myTypeEvalContext);
  }

  public TypeEvalContext getTypeEvalContext() {
    return myTypeEvalContext != null ? myTypeEvalContext : TypeEvalContext.codeInsightFallback();
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    PyResolveContext that = (PyResolveContext)o;

    if (myAllowImplicits != that.myAllowImplicits) return false;
    if (myTypeEvalContext != null ? !myTypeEvalContext.equals(that.myTypeEvalContext) : that.myTypeEvalContext != null) return false;

    return true;
  }

  @Override
  public int hashCode() {
    int result = (myAllowImplicits ? 1 : 0);
    result = 31 * result + (myTypeEvalContext != null ? myTypeEvalContext.hashCode() : 0);
    return result;
  }
}