ClsReferenceParameterListImpl.java

/*
 * Copyright 2000-2016 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.intellij.psi.impl.compiled;

import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiReferenceParameterList;
import com.intellij.psi.PsiType;
import com.intellij.psi.PsiTypeElement;
import com.intellij.psi.impl.source.tree.TreeElement;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ClsReferenceParameterListImpl extends ClsElementImpl implements PsiReferenceParameterList {
  @NonNls private static final Pattern EXTENDS_PREFIX = Pattern.compile("^(\\?\\s*extends\\s*)(.*)");
  @NonNls private static final Pattern SUPER_PREFIX = Pattern.compile("^(\\?\\s*super\\s*)(.*)");

  private final PsiElement myParent;
  private final ClsTypeElementImpl[] myTypeParameters;
  private volatile PsiType[] myTypeParametersCachedTypes;

  public ClsReferenceParameterListImpl(PsiElement parent, String[] classParameters) {
    myParent = parent;

    int length = classParameters.length;
    myTypeParameters = new ClsTypeElementImpl[length];

    for (int i = 0; i < length; i++) {
      String s = classParameters[length - i - 1];
      char variance = ClsTypeElementImpl.VARIANCE_NONE;
      final Matcher extendsMatcher = EXTENDS_PREFIX.matcher(s);
      if (extendsMatcher.find()) {
        variance = ClsTypeElementImpl.VARIANCE_EXTENDS;
        s = extendsMatcher.group(2);
      }
      else {
        final Matcher superMatcher = SUPER_PREFIX.matcher(s);
        if (superMatcher.find()) {
          variance = ClsTypeElementImpl.VARIANCE_SUPER;
          s = superMatcher.group(2);
        }
        else if (StringUtil.startsWithChar(s, '?')) {
          variance = ClsTypeElementImpl.VARIANCE_INVARIANT;
          s = s.substring(1);
        }
      }

      myTypeParameters[i] = new ClsTypeElementImpl(this, s, variance);
    }
  }

  @Override
  public void appendMirrorText(int indentLevel, @NotNull StringBuilder buffer) { }

  @Override
  public void setMirror(@NotNull TreeElement element) throws InvalidMirrorException { }

  @NotNull
  @Override
  public PsiTypeElement[] getTypeParameterElements() {
    return myTypeParameters;
  }

  @NotNull
  @Override
  public PsiType[] getTypeArguments() {
    PsiType[] cachedTypes = myTypeParametersCachedTypes;
    if (cachedTypes == null) {
      cachedTypes = PsiType.createArray(myTypeParameters.length);
      for (int i = 0; i < cachedTypes.length; i++) {
        cachedTypes[cachedTypes.length - i - 1] = myTypeParameters[i].getType();
      }
      myTypeParametersCachedTypes = cachedTypes;
    }
    return cachedTypes;
  }

  @NotNull
  @Override
  public PsiElement[] getChildren() {
    return myTypeParameters;
  }

  @Override
  public PsiElement getParent() {
    return myParent;
  }
}