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Bobo is a Faceted Search implementation written purely in Java, an extension of Apache Lucene

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package com.browseengine.bobo.client;

import org.apache.lucene.search.SortField;

import com.browseengine.bobo.api.BrowseRequest;
import com.browseengine.bobo.api.BrowseSelection;
import com.browseengine.bobo.api.FacetSpec;
import com.browseengine.bobo.api.FacetSpec.FacetSortSpec;

public class BrowseRequestBuilder {
  private BrowseRequest _req;
  private String _qString;

  public BrowseRequestBuilder() {
    clear();
  }

  public BrowseRequestBuilder addSelection(String name, String val, boolean isNot) {
    BrowseSelection sel = _req.getSelection(name);
    if (sel == null) {
      sel = new BrowseSelection(name);
    }
    if (isNot) {
      sel.addNotValue(val);
    } else {
      sel.addValue(val);
    }
    _req.addSelection(sel);
    return this;
  }

  public BrowseRequestBuilder clearSelection(String name) {
    _req.removeSelection(name);
    return this;
  }

  public BrowseRequestBuilder applyFacetSpec(String name, int minHitCount, int maxCount,
      boolean expand, FacetSortSpec orderBy) {
    FacetSpec fspec = new FacetSpec();
    fspec.setMinHitCount(minHitCount);
    fspec.setMaxCount(maxCount);
    fspec.setExpandSelection(expand);
    fspec.setOrderBy(orderBy);
    _req.setFacetSpec(name, fspec);
    return this;
  }

  public BrowseRequestBuilder applySort(SortField[] sorts) {
    if (sorts == null) {
      _req.clearSort();
    } else {
      _req.setSort(sorts);
    }
    return this;
  }

  public BrowseRequestBuilder clearFacetSpecs() {
    _req.getFacetSpecs().clear();
    return this;
  }

  public BrowseRequestBuilder clearFacetSpec(String name) {
    _req.getFacetSpecs().remove(name);
    return this;
  }

  public BrowseRequestBuilder setOffset(int offset) {
    _req.setOffset(offset);
    return this;
  }

  public BrowseRequestBuilder setCount(int count) {
    _req.setCount(count);
    return this;
  }

  public BrowseRequestBuilder setQuery(String qString) {
    _qString = qString;
    return this;
  }

  public BrowseRequestBuilder clear() {
    _req = new BrowseRequest();
    _req.setOffset(0);
    _req.setCount(5);
    _req.setFetchStoredFields(true);
    _qString = null;
    return this;
  }

  public BrowseRequestBuilder clearSelections() {
    _req.clearSelections();
    return this;
  }

  public BrowseRequest getRequest() {
    return _req;
  }

  public String getQueryString() {
    return _qString;
  }
}