pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / index / KeepOnlyLastCommitDeletionPolicy.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/KeepOnlyLastCommitDeletionPolicy.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/KeepOnlyLastCommitDeletionPolicy.java
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+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/KeepOnlyLastCommitDeletionPolicy.java
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+package org.apache.lucene.index;
+
+/**
+ * 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 java.util.List;
+
+/**
+ * This {@link IndexDeletionPolicy} implementation that
+ * keeps only the most recent commit and immediately removes
+ * all prior commits after a new commit is done.  This is
+ * the default deletion policy.
+ */
+
+public final class KeepOnlyLastCommitDeletionPolicy implements IndexDeletionPolicy {
+
+  /**
+   * Deletes all commits except the most recent one.
+   */
+  public void onInit(List<? extends IndexCommit> commits) {
+    // Note that commits.size() should normally be 1:
+    onCommit(commits);
+  }
+
+  /**
+   * Deletes all commits except the most recent one.
+   */
+  public void onCommit(List<? extends IndexCommit> commits) {
+    // Note that commits.size() should normally be 2 (if not
+    // called by onInit above):
+    int size = commits.size();
+    for(int i=0;i<size-1;i++) {
+      commits.get(i).delete();
+    }
+  }
+}