pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / search / spans / SpanFirstQuery.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/spans/SpanFirstQuery.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/spans/SpanFirstQuery.java
new file mode 100644 (file)
index 0000000..4c9adaf
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/spans/SpanFirstQuery.java
@@ -0,0 +1,90 @@
+package org.apache.lucene.search.spans;
+
+/**
+ * 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.util.ToStringUtils;
+
+import java.io.IOException;
+
+/** Matches spans near the beginning of a field.
+ * <p/> 
+ * This class is a simple extension of {@link SpanPositionRangeQuery} in that it assumes the
+ * start to be zero and only checks the end boundary.
+ *
+ *
+ *  */
+public class SpanFirstQuery extends SpanPositionRangeQuery {
+
+  /** Construct a SpanFirstQuery matching spans in <code>match</code> whose end
+   * position is less than or equal to <code>end</code>. */
+  public SpanFirstQuery(SpanQuery match, int end) {
+    super(match, 0, end);
+  }
+
+  @Override
+  protected AcceptStatus acceptPosition(Spans spans) throws IOException {
+    assert spans.start() != spans.end();
+    if (spans.start() >= end)
+      return AcceptStatus.NO_AND_ADVANCE;
+    else if (spans.end() <= end)
+      return AcceptStatus.YES;
+    else
+      return AcceptStatus.NO;
+  }
+
+
+  @Override
+  public String toString(String field) {
+    StringBuilder buffer = new StringBuilder();
+    buffer.append("spanFirst(");
+    buffer.append(match.toString(field));
+    buffer.append(", ");
+    buffer.append(end);
+    buffer.append(")");
+    buffer.append(ToStringUtils.boost(getBoost()));
+    return buffer.toString();
+  }
+
+  @Override
+  public Object clone() {
+    SpanFirstQuery spanFirstQuery = new SpanFirstQuery((SpanQuery) match.clone(), end);
+    spanFirstQuery.setBoost(getBoost());
+    return spanFirstQuery;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (!(o instanceof SpanFirstQuery)) return false;
+
+    SpanFirstQuery other = (SpanFirstQuery)o;
+    return this.end == other.end
+         && this.match.equals(other.match)
+         && this.getBoost() == other.getBoost();
+  }
+
+  @Override
+  public int hashCode() {
+    int h = match.hashCode();
+    h ^= (h << 8) | (h >>> 25);  // reversible
+    h ^= Float.floatToRawIntBits(getBoost()) ^ end;
+    return h;
+  }
+
+
+}