FileDocCategorySizeDatePackage
FieldCacheImpl.javaAPI DocApache Lucene 1.4.312816Thu Sep 30 21:10:26 BST 2004org.apache.lucene.search

FieldCacheImpl

public class FieldCacheImpl extends Object implements FieldCache
Expert: The default cache implementation, storing all values in memory. A WeakHashMap is used for storage.

Created: May 19, 2004 4:40:36 PM

author
Tim Jones (Nacimiento Software)
since
lucene 1.4
version
$Id: FieldCacheImpl.java,v 1.3.2.1 2004/09/30 19:10:26 dnaber Exp $

Fields Summary
final Map
cache
The internal cache. Maps Entry to array of interpreted term values.
Constructors Summary
Methods Summary
public java.lang.ObjectgetAuto(org.apache.lucene.index.IndexReader reader, java.lang.String field)
removed for java 1.3 compatibility protected static final Object pFloats = Pattern.compile ("[0-9+\\-\\.eEfFdD]+");

    field = field.intern();
    Object ret = lookup (reader, field, SortField.AUTO);
    if (ret == null) {
      TermEnum enumerator = reader.terms (new Term (field, ""));
      try {
        Term term = enumerator.term();
        if (term == null) {
          throw new RuntimeException ("no terms in field " + field + " - cannot determine sort type");
        }
        if (term.field() == field) {
          String termtext = term.text().trim();

          /**
           * Java 1.4 level code:

           if (pIntegers.matcher(termtext).matches())
           return IntegerSortedHitQueue.comparator (reader, enumerator, field);

           else if (pFloats.matcher(termtext).matches())
           return FloatSortedHitQueue.comparator (reader, enumerator, field);
           */

          // Java 1.3 level code:
          try {
            Integer.parseInt (termtext);
            ret = getInts (reader, field);
          } catch (NumberFormatException nfe1) {
            try {
              Float.parseFloat (termtext);
              ret = getFloats (reader, field);
            } catch (NumberFormatException nfe2) {
              ret = getStringIndex (reader, field);
            }
          }
          if (ret != null) {
            store (reader, field, SortField.AUTO, ret);
          }
        } else {
          throw new RuntimeException ("field \"" + field + "\" does not appear to be indexed");
        }
      } finally {
        enumerator.close();
      }

    }
    return ret;
public java.lang.Comparable[]getCustom(org.apache.lucene.index.IndexReader reader, java.lang.String field, org.apache.lucene.search.SortComparator comparator)

    field = field.intern();
    Object ret = lookup (reader, field, comparator);
    if (ret == null) {
      final Comparable[] retArray = new Comparable[reader.maxDoc()];
      if (retArray.length > 0) {
        TermDocs termDocs = reader.termDocs();
        TermEnum termEnum = reader.terms (new Term (field, ""));
        try {
          if (termEnum.term() == null) {
            throw new RuntimeException ("no terms in field " + field);
          }
          do {
            Term term = termEnum.term();
            if (term.field() != field) break;
            Comparable termval = comparator.getComparable (term.text());
            termDocs.seek (termEnum);
            while (termDocs.next()) {
              retArray[termDocs.doc()] = termval;
            }
          } while (termEnum.next());
        } finally {
          termDocs.close();
          termEnum.close();
        }
      }
      store (reader, field, SortField.CUSTOM, retArray);
      return retArray;
    }
    return (Comparable[]) ret;
public float[]getFloats(org.apache.lucene.index.IndexReader reader, java.lang.String field)

    field = field.intern();
    Object ret = lookup (reader, field, SortField.FLOAT);
    if (ret == null) {
      final float[] retArray = new float[reader.maxDoc()];
      if (retArray.length > 0) {
        TermDocs termDocs = reader.termDocs();
        TermEnum termEnum = reader.terms (new Term (field, ""));
        try {
          if (termEnum.term() == null) {
            throw new RuntimeException ("no terms in field " + field);
          }
          do {
            Term term = termEnum.term();
            if (term.field() != field) break;
            float termval = Float.parseFloat (term.text());
            termDocs.seek (termEnum);
            while (termDocs.next()) {
              retArray[termDocs.doc()] = termval;
            }
          } while (termEnum.next());
        } finally {
          termDocs.close();
          termEnum.close();
        }
      }
      store (reader, field, SortField.FLOAT, retArray);
      return retArray;
    }
    return (float[]) ret;
public int[]getInts(org.apache.lucene.index.IndexReader reader, java.lang.String field)

    field = field.intern();
    Object ret = lookup (reader, field, SortField.INT);
    if (ret == null) {
      final int[] retArray = new int[reader.maxDoc()];
      if (retArray.length > 0) {
        TermDocs termDocs = reader.termDocs();
        TermEnum termEnum = reader.terms (new Term (field, ""));
        try {
          if (termEnum.term() == null) {
            throw new RuntimeException ("no terms in field " + field);
          }
          do {
            Term term = termEnum.term();
            if (term.field() != field) break;
            int termval = Integer.parseInt (term.text());
            termDocs.seek (termEnum);
            while (termDocs.next()) {
              retArray[termDocs.doc()] = termval;
            }
          } while (termEnum.next());
        } finally {
          termDocs.close();
          termEnum.close();
        }
      }
      store (reader, field, SortField.INT, retArray);
      return retArray;
    }
    return (int[]) ret;
public StringIndexgetStringIndex(org.apache.lucene.index.IndexReader reader, java.lang.String field)

    field = field.intern();
    Object ret = lookup (reader, field, STRING_INDEX);
    if (ret == null) {
      final int[] retArray = new int[reader.maxDoc()];
      String[] mterms = new String[reader.maxDoc()+1];
      if (retArray.length > 0) {
        TermDocs termDocs = reader.termDocs();
        TermEnum termEnum = reader.terms (new Term (field, ""));
        int t = 0;  // current term number

        // an entry for documents that have no terms in this field
        // should a document with no terms be at top or bottom?
        // this puts them at the top - if it is changed, FieldDocSortedHitQueue
        // needs to change as well.
        mterms[t++] = null;

        try {
          if (termEnum.term() == null) {
            throw new RuntimeException ("no terms in field " + field);
          }
          do {
            Term term = termEnum.term();
            if (term.field() != field) break;

            // store term text
            // we expect that there is at most one term per document
            if (t >= mterms.length) throw new RuntimeException ("there are more terms than documents in field \"" + field + "\"");
            mterms[t] = term.text();

            termDocs.seek (termEnum);
            while (termDocs.next()) {
              retArray[termDocs.doc()] = t;
            }

            t++;
          } while (termEnum.next());
        } finally {
          termDocs.close();
          termEnum.close();
        }

        if (t == 0) {
          // if there are no terms, make the term array
          // have a single null entry
          mterms = new String[1];
        } else if (t < mterms.length) {
          // if there are less terms than documents,
          // trim off the dead array space
          String[] terms = new String[t];
          System.arraycopy (mterms, 0, terms, 0, t);
          mterms = terms;
        }
      }
      StringIndex value = new StringIndex (retArray, mterms);
      store (reader, field, STRING_INDEX, value);
      return value;
    }
    return (StringIndex) ret;
public java.lang.String[]getStrings(org.apache.lucene.index.IndexReader reader, java.lang.String field)

    field = field.intern();
    Object ret = lookup (reader, field, SortField.STRING);
    if (ret == null) {
      final String[] retArray = new String[reader.maxDoc()];
      if (retArray.length > 0) {
        TermDocs termDocs = reader.termDocs();
        TermEnum termEnum = reader.terms (new Term (field, ""));
        try {
          if (termEnum.term() == null) {
            throw new RuntimeException ("no terms in field " + field);
          }
          do {
            Term term = termEnum.term();
            if (term.field() != field) break;
            String termval = term.text();
            termDocs.seek (termEnum);
            while (termDocs.next()) {
              retArray[termDocs.doc()] = termval;
            }
          } while (termEnum.next());
        } finally {
          termDocs.close();
          termEnum.close();
        }
      }
      store (reader, field, SortField.STRING, retArray);
      return retArray;
    }
    return (String[]) ret;
java.lang.Objectlookup(org.apache.lucene.index.IndexReader reader, java.lang.String field, int type)
See if an object is in the cache.


           
          
    Entry entry = new Entry (field, type);
    synchronized (this) {
      HashMap readerCache = (HashMap)cache.get(reader);
      if (readerCache == null) return null;
      return readerCache.get (entry);
    }
java.lang.Objectlookup(org.apache.lucene.index.IndexReader reader, java.lang.String field, java.lang.Object comparer)
See if a custom object is in the cache.

    Entry entry = new Entry (field, comparer);
    synchronized (this) {
      HashMap readerCache = (HashMap)cache.get(reader);
      if (readerCache == null) return null;
      return readerCache.get (entry);
    }
java.lang.Objectstore(org.apache.lucene.index.IndexReader reader, java.lang.String field, int type, java.lang.Object value)
Put an object into the cache.

    Entry entry = new Entry (field, type);
    synchronized (this) {
      HashMap readerCache = (HashMap)cache.get(reader);
      if (readerCache == null) {
        readerCache = new HashMap();
        cache.put(reader,readerCache);
      }
      return readerCache.put (entry, value);
    }
java.lang.Objectstore(org.apache.lucene.index.IndexReader reader, java.lang.String field, java.lang.Object comparer, java.lang.Object value)
Put a custom object into the cache.

    Entry entry = new Entry (field, comparer);
    synchronized (this) {
      HashMap readerCache = (HashMap)cache.get(reader);
      if (readerCache == null) {
        readerCache = new HashMap();
        cache.put(reader, readerCache);
      }
      return readerCache.put (entry, value);
    }