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A packaging of the IntelliJ Community Edition java-psi-api library. This is release number 1 of trunk branch 142.

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/*
 * Copyright 2000-2009 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.patterns;

import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiMethod;
import com.intellij.psi.PsiParameter;
import com.intellij.util.PairProcessor;
import com.intellij.util.ProcessingContext;
import org.jetbrains.annotations.NotNull;

/**
 * @author Gregory Shrago
 */
public class PsiParameterPattern extends PsiModifierListOwnerPattern {

  protected PsiParameterPattern() {
    super(PsiParameter.class);
  }

  public PsiParameterPattern ofMethod(final int index, final ElementPattern pattern) {
    return with(new PatternConditionPlus("ofMethod", pattern) {
      @Override
      public boolean processValues(PsiParameter t,
                                   ProcessingContext context,
                                   PairProcessor processor) {
        PsiElement scope = t.getDeclarationScope();
        if (!(scope instanceof PsiMethod)) return true;
        return processor.process((PsiMethod)scope, context);
      }

      public boolean accepts(@NotNull final PsiParameter t, final ProcessingContext context) {
        if (!super.accepts(t, context)) return false;
        final PsiMethod psiMethod = (PsiMethod)t.getDeclarationScope();

        final PsiParameter[] parameters = psiMethod.getParameterList().getParameters();
        if (index < 0 || index >= parameters.length || !t.equals(parameters[index])) return false;
        return true;
      }
    });
  }
}