ItemFilter.java

package crazypants.enderio.machine.invpanel.client;

import crazypants.enderio.conduit.item.filter.IItemFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Locale;
import java.util.regex.Pattern;

public abstract class ItemFilter {

  private static final Pattern SPLIT_PATTERN = Pattern.compile("\\s+");

  public abstract boolean matches(ItemEntry entry);

  public static ItemFilter parse(String filter, Locale locale, IItemFilter filterCard) {
    ArrayList<ItemFilter> list = new ArrayList<ItemFilter>();
    if(filterCard != null) {
      list.add(new CardFilter(filterCard));
    }

    String[] parts = SPLIT_PATTERN.split(filter);
    for(String part : parts) {
      if(part.startsWith("@")) {
        part = part.substring(1);
        if(!part.isEmpty()) {
          list.add(new ModFilter(part, locale));
        }
      } else if(!part.isEmpty()) {
        list.add(new NameFilter(part, locale));
      }
    }

    if(list.isEmpty()) {
      return null;
    }
    if(list.size() == 1) {
      return list.get(0);
    }
    return new AndFilter(list.toArray(new ItemFilter[list.size()]));
  }

  static class AndFilter extends ItemFilter {
    final ItemFilter[] list;

    AndFilter(ItemFilter[] list) {
      this.list = list;
    }

    @Override
    public boolean matches(ItemEntry entry) {
      for(ItemFilter f : list) {
        if(!f.matches(entry)) {
          return false;
        }
      }
      return true;
    }

    @Override
    public String toString() {
      return Arrays.deepToString(list);
    }
  }

  static class ModFilter extends ItemFilter {
    final String text;
    final Locale locale;

    ModFilter(String text, Locale locale) {
      this.text = text.toLowerCase(locale);
      this.locale = locale;
    }

    @Override
    public boolean matches(ItemEntry entry) {
      return entry.getModId().toLowerCase(locale).contains(text);
    }

    @Override
    public String toString() {
      return "@" + text;
    }
  }

  static class NameFilter extends ItemFilter {
    final String text;
    final Locale locale;

    NameFilter(String text, Locale locale) {
      this.text = text.toLowerCase(locale);
      this.locale = locale;
    }

    @Override
    public boolean matches(ItemEntry entry) {
      return entry.getLowercaseUnlocName(locale).contains(text);
    }

    @Override
    public String toString() {
      return text;
    }
  }

  static class CardFilter extends ItemFilter {
    final IItemFilter filter;
    CardFilter(IItemFilter filter) {
      this.filter = filter;
    }

    @Override
    public boolean matches(ItemEntry entry) {
      return filter.doesItemPassFilter(null, entry.makeItemStack());
    }
  }
}