platform/platform-api/src/com/intellij/ui/speedSearch/NameFilteringListModel.java

/*
 * Copyright 2000-2012 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.
 */

/*
 * @author max
 */
package com.intellij.ui.speedSearch;

import com.intellij.openapi.util.Computable;
import com.intellij.openapi.util.Condition;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.util.Function;

import javax.swing.*;

/**
 * @param <T> list elements generic type
 *
 * @author max
 * @author Konstantin Bulenkov
 */
public class NameFilteringListModel<T> extends FilteringListModel<T> {
  private final Function<T, String> myNamer;
  private int myFullMatchIndex = -1;
  private int myStartsWithIndex = -1;
  private final Computable<String> myPattern;

  public NameFilteringListModel(JList list,
                                final Function<T, String> namer,
                                final Condition<String> filter,
                                final SpeedSearch speedSearch) {
    this(list, namer, filter, new Computable<String>() {
      @Override
      public String compute() {
        return speedSearch.getFilter();
      }
    });
  }

  public NameFilteringListModel(JList list, final Function<T, String> namer, final Condition<String> filter, final SpeedSearchSupply speedSearch) {
    this(list, namer, filter, new Computable<String>() {
          @Override
          public String compute() {
            final String prefix = speedSearch.getEnteredPrefix();
            return prefix == null ? "" : prefix;
          }
        });
  }

  public NameFilteringListModel(JList list, final Function<T, String> namer, final Condition<String> filter, Computable<String> pattern) {
    super(list);
    myPattern = pattern;
    myNamer = namer;
    setFilter(namer != null ? new Condition<T>() {
      public boolean value(T t) {
        return filter.value(namer.fun(t));
      }
    } : null);
  }

  @Override
  protected void addToFiltered(T elt) {
    super.addToFiltered(elt);

    if (myNamer != null) {
      String filterString = StringUtil.toUpperCase(myPattern.compute());
      String candidateString = StringUtil.toUpperCase(myNamer.fun(elt));
      int index = getSize() - 1;

      if (myFullMatchIndex == -1 && filterString.equals(candidateString)) {
        myFullMatchIndex = index;
      }

      if (myStartsWithIndex == -1 && candidateString.startsWith(filterString)) {
        myStartsWithIndex = index;
      }
    }
  }

  @Override
  public void refilter() {
    myFullMatchIndex = -1;
    myStartsWithIndex = -1;
    super.refilter();
  }

  public int getClosestMatchIndex() {
    return myFullMatchIndex != -1 ? myFullMatchIndex : myStartsWithIndex;
  }
}