ClsReferenceParameterListImpl.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.intellij.psi.impl.compiled;

import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.*;
import com.intellij.psi.impl.source.tree.TreeElement;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

public class ClsReferenceParameterListImpl extends ClsElementImpl implements PsiReferenceParameterList {
  @NonNls private static final String EXTENDS_PREFIX = "?extends";
  @NonNls private static final String SUPER_PREFIX = "?super";

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

  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;
      if (s.startsWith(EXTENDS_PREFIX)) {
        variance = ClsTypeElementImpl.VARIANCE_EXTENDS;
        s = s.substring(EXTENDS_PREFIX.length());
      }
      else if (s.startsWith(SUPER_PREFIX)) {
        variance = ClsTypeElementImpl.VARIANCE_SUPER;
        s = s.substring(SUPER_PREFIX.length());
      }
      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 = myTypeParameters.length == 0 ? PsiType.EMPTY_ARRAY : new PsiType[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;
  }
}