pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / queries / src / java / org / apache / lucene / search / regex / RegexTermEnum.java

diff --git a/lucene-java-3.5.0/lucene/contrib/queries/src/java/org/apache/lucene/search/regex/RegexTermEnum.java b/lucene-java-3.5.0/lucene/contrib/queries/src/java/org/apache/lucene/search/regex/RegexTermEnum.java
new file mode 100644 (file)
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+++ b/lucene-java-3.5.0/lucene/contrib/queries/src/java/org/apache/lucene/search/regex/RegexTermEnum.java
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+package org.apache.lucene.search.regex;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+import org.apache.lucene.search.FilteredTermEnum;
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.Term;
+
+import java.io.IOException;
+
+/**
+ * Subclass of FilteredTermEnum for enumerating all terms that match the
+ * specified regular expression term using the specified regular expression
+ * implementation.
+ * <p>
+ * Term enumerations are always ordered by Term.compareTo().  Each term in
+ * the enumeration is greater than all that precede it.
+ */
+
+public class RegexTermEnum extends FilteredTermEnum {
+  private String field = "";
+  private String pre = "";
+  private boolean endEnum = false;
+  private RegexCapabilities regexImpl;
+
+  public RegexTermEnum(IndexReader reader, Term term, RegexCapabilities regexImpl) throws IOException {
+    super();
+    field = term.field();
+    String text = term.text();
+    this.regexImpl = regexImpl;
+
+    regexImpl.compile(text);
+
+    pre = regexImpl.prefix();
+    if (pre == null) pre = "";
+
+    setEnum(reader.terms(new Term(term.field(), pre)));
+  }
+
+  @Override
+  protected final boolean termCompare(Term term) {
+    if (field == term.field()) {
+      String searchText = term.text();
+      if (searchText.startsWith(pre)) {
+        return regexImpl.match(searchText);
+      }
+    }
+    endEnum = true;
+    return false;
+  }
+
+  @Override
+  public final float difference() {
+// TODO: adjust difference based on distance of searchTerm.text() and term().text()
+    return 1.0f;
+  }
+
+  @Override
+  public final boolean endEnum() {
+    return endEnum;
+  }
+
+  @Override
+  public void close() throws IOException {
+    super.close();
+    field = null;
+  }
+}