pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/StoredFieldsWriter.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/StoredFieldsWriter.java
new file mode 100644 (file)
index 0000000..f6b68ac
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/StoredFieldsWriter.java
@@ -0,0 +1,155 @@
+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.io.IOException;
+import org.apache.lucene.store.RAMOutputStream;
+import org.apache.lucene.util.ArrayUtil;
+import org.apache.lucene.util.RamUsageEstimator;
+
+/** This is a DocFieldConsumer that writes stored fields. */
+final class StoredFieldsWriter {
+
+  FieldsWriter fieldsWriter;
+  final DocumentsWriter docWriter;
+  final FieldInfos fieldInfos;
+  int lastDocID;
+
+  PerDoc[] docFreeList = new PerDoc[1];
+  int freeCount;
+
+  public StoredFieldsWriter(DocumentsWriter docWriter, FieldInfos fieldInfos) {
+    this.docWriter = docWriter;
+    this.fieldInfos = fieldInfos;
+  }
+
+  public StoredFieldsWriterPerThread addThread(DocumentsWriter.DocState docState) throws IOException {
+    return new StoredFieldsWriterPerThread(docState, this);
+  }
+
+  synchronized public void flush(SegmentWriteState state) throws IOException {
+    if (state.numDocs > lastDocID) {
+      initFieldsWriter();
+      fill(state.numDocs);
+    }
+
+    if (fieldsWriter != null) {
+      fieldsWriter.close();
+      fieldsWriter = null;
+      lastDocID = 0;
+
+      String fieldsIdxName = IndexFileNames.segmentFileName(state.segmentName, IndexFileNames.FIELDS_INDEX_EXTENSION);
+      if (4 + ((long) state.numDocs) * 8 != state.directory.fileLength(fieldsIdxName)) {
+        throw new RuntimeException("after flush: fdx size mismatch: " + state.numDocs + " docs vs " + state.directory.fileLength(fieldsIdxName) + " length in bytes of " + fieldsIdxName + " file exists?=" + state.directory.fileExists(fieldsIdxName));
+      }
+    }
+  }
+
+  private synchronized void initFieldsWriter() throws IOException {
+    if (fieldsWriter == null) {
+      fieldsWriter = new FieldsWriter(docWriter.directory, docWriter.getSegment(), fieldInfos);
+      lastDocID = 0;
+    }
+  }
+
+  int allocCount;
+
+  synchronized PerDoc getPerDoc() {
+    if (freeCount == 0) {
+      allocCount++;
+      if (allocCount > docFreeList.length) {
+        // Grow our free list up front to make sure we have
+        // enough space to recycle all outstanding PerDoc
+        // instances
+        assert allocCount == 1+docFreeList.length;
+        docFreeList = new PerDoc[ArrayUtil.oversize(allocCount, RamUsageEstimator.NUM_BYTES_OBJECT_REF)];
+      }
+      return new PerDoc();
+    } else {
+      return docFreeList[--freeCount];
+    }
+  }
+
+  synchronized void abort() {
+    if (fieldsWriter != null) {
+      fieldsWriter.abort();
+      fieldsWriter = null;
+      lastDocID = 0;
+    }
+  }
+
+  /** Fills in any hole in the docIDs */
+  void fill(int docID) throws IOException {
+    // We must "catch up" for all docs before us
+    // that had no stored fields:
+    while(lastDocID < docID) {
+      fieldsWriter.skipDocument();
+      lastDocID++;
+    }
+  }
+
+  synchronized void finishDocument(PerDoc perDoc) throws IOException {
+    assert docWriter.writer.testPoint("StoredFieldsWriter.finishDocument start");
+    initFieldsWriter();
+
+    fill(perDoc.docID);
+
+    // Append stored fields to the real FieldsWriter:
+    fieldsWriter.flushDocument(perDoc.numStoredFields, perDoc.fdt);
+    lastDocID++;
+    perDoc.reset();
+    free(perDoc);
+    assert docWriter.writer.testPoint("StoredFieldsWriter.finishDocument end");
+  }
+
+  synchronized void free(PerDoc perDoc) {
+    assert freeCount < docFreeList.length;
+    assert 0 == perDoc.numStoredFields;
+    assert 0 == perDoc.fdt.length();
+    assert 0 == perDoc.fdt.getFilePointer();
+    docFreeList[freeCount++] = perDoc;
+  }
+
+  class PerDoc extends DocumentsWriter.DocWriter {
+    final DocumentsWriter.PerDocBuffer buffer = docWriter.newPerDocBuffer();
+    RAMOutputStream fdt = new RAMOutputStream(buffer);
+    int numStoredFields;
+
+    void reset() {
+      fdt.reset();
+      buffer.recycle();
+      numStoredFields = 0;
+    }
+
+    @Override
+    void abort() {
+      reset();
+      free(this);
+    }
+
+    @Override
+    public long sizeInBytes() {
+      return buffer.getSizeInBytes();
+    }
+
+    @Override
+    public void finish() throws IOException {
+      finishDocument(this);
+    }
+  }
+}