platform/platform-api/src/com/intellij/psi/statistics/StatisticsInfo.java

/*
 * 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.psi.statistics;

import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @author peter
 */
public class StatisticsInfo {
  public static final StatisticsInfo EMPTY = new StatisticsInfo("empty", "empty");

  private static final StatisticsManager ourManager = StatisticsManager.getInstance();
  private final String myContext;
  private final String myValue;
  private final List<StatisticsInfo> myConjuncts;

  public StatisticsInfo(@NonNls @NotNull final String context, @NonNls @NotNull final String value) {
    myContext = context;
    myValue = value;
    myConjuncts = Collections.singletonList(this);
  }

  private StatisticsInfo(String context, String value, List<StatisticsInfo> conjuncts) {
    myContext = context;
    myValue = value;
    myConjuncts = conjuncts;
  }

  public static StatisticsInfo createComposite(List<StatisticsInfo> conjuncts) {
    if (conjuncts.isEmpty()) {
      return EMPTY;
    }

    ArrayList<StatisticsInfo> flattened = new ArrayList<StatisticsInfo>(conjuncts.size());
    for (StatisticsInfo conjunct : conjuncts) {
      flattened.addAll(conjunct.getConjuncts());
    }
    return new StatisticsInfo(conjuncts.get(0).getContext(), conjuncts.get(0).getValue(), flattened);
  }

  @NotNull
  public String getContext() {
    return myContext;
  }

  @NotNull
  public String getValue() {
    return myValue;
  }

  public List<StatisticsInfo> getConjuncts() {
    return myConjuncts;
  }

  public void incUseCount() {
    ourManager.incUseCount(this);
  }

  public int getUseCount() {
    return ourManager.getUseCount(this);
  }

  public int getLastUseRecency() {
    return ourManager.getLastUseRecency(this);
  }

  public String toString() {
    return myContext + "::::" + myValue + (myConjuncts.size() == 1 ? "" : "::::" + myConjuncts);
  }
}