| /* |
| * 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. |
| */ |
| |
| package org.apache.lucene.index; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| |
| import org.apache.lucene.codecs.PostingsFormat; // javadocs |
| import org.apache.lucene.index.TermsEnum.SeekStatus; |
| import org.apache.lucene.search.DocIdSetIterator; |
| import org.apache.lucene.util.Bits; |
| import org.apache.lucene.util.BytesRef; |
| import org.apache.lucene.util.PagedBytes; |
| import org.apache.lucene.util.StringHelper; |
| |
| /** |
| * This class enables fast access to multiple term ords for |
| * a specified field across all docIDs. |
| * |
| * Like FieldCache, it uninverts the index and holds a |
| * packed data structure in RAM to enable fast access. |
| * Unlike FieldCache, it can handle multi-valued fields, |
| * and, it does not hold the term bytes in RAM. Rather, you |
| * must obtain a TermsEnum from the {@link #getOrdTermsEnum} |
| * method, and then seek-by-ord to get the term's bytes. |
| * |
| * While normally term ords are type long, in this API they are |
| * int as the internal representation here cannot address |
| * more than MAX_INT unique terms. Also, typically this |
| * class is used on fields with relatively few unique terms |
| * vs the number of documents. In addition, there is an |
| * internal limit (16 MB) on how many bytes each chunk of |
| * documents may consume. If you trip this limit you'll hit |
| * an IllegalStateException. |
| * |
| * Deleted documents are skipped during uninversion, and if |
| * you look them up you'll get 0 ords. |
| * |
| * The returned per-document ords do not retain their |
| * original order in the document. Instead they are returned |
| * in sorted (by ord, ie term's BytesRef comparator) order. They |
| * are also de-dup'd (ie if doc has same term more than once |
| * in this field, you'll only get that ord back once). |
| * |
| * This class tests whether the provided reader is able to |
| * retrieve terms by ord (ie, it's single segment, and it |
| * uses an ord-capable terms index). If not, this class |
| * will create its own term index internally, allowing to |
| * create a wrapped TermsEnum that can handle ord. The |
| * {@link #getOrdTermsEnum} method then provides this |
| * wrapped enum, if necessary. |
| * |
| * The RAM consumption of this class can be high! |
| * |
| * @lucene.experimental |
| */ |
| |
| /* |
| * Final form of the un-inverted field: |
| * Each document points to a list of term numbers that are contained in that document. |
| * |
| * Term numbers are in sorted order, and are encoded as variable-length deltas from the |
| * previous term number. Real term numbers start at 2 since 0 and 1 are reserved. A |
| * term number of 0 signals the end of the termNumber list. |
| * |
| * There is a single int[maxDoc()] which either contains a pointer into a byte[] for |
| * the termNumber lists, or directly contains the termNumber list if it fits in the 4 |
| * bytes of an integer. If the first byte in the integer is 1, the next 3 bytes |
| * are a pointer into a byte[] where the termNumber list starts. |
| * |
| * There are actually 256 byte arrays, to compensate for the fact that the pointers |
| * into the byte arrays are only 3 bytes long. The correct byte array for a document |
| * is a function of it's id. |
| * |
| * To save space and speed up faceting, any term that matches enough documents will |
| * not be un-inverted... it will be skipped while building the un-inverted field structure, |
| * and will use a set intersection method during faceting. |
| * |
| * To further save memory, the terms (the actual string values) are not all stored in |
| * memory, but a TermIndex is used to convert term numbers to term values only |
| * for the terms needed after faceting has completed. Only every 128th term value |
| * is stored, along with it's corresponding term number, and this is used as an |
| * index to find the closest term and iterate until the desired number is hit (very |
| * much like Lucene's own internal term index). |
| * |
| */ |
| |
| public class DocTermOrds { |
| |
| // Term ords are shifted by this, internally, to reserve |
| // values 0 (end term) and 1 (index is a pointer into byte array) |
| private final static int TNUM_OFFSET = 2; |
| |
| /** Every 128th term is indexed, by default. */ |
| public final static int DEFAULT_INDEX_INTERVAL_BITS = 7; // decrease to a low number like 2 for testing |
| |
| private int indexIntervalBits; |
| private int indexIntervalMask; |
| private int indexInterval; |
| |
| /** Don't uninvert terms that exceed this count. */ |
| protected final int maxTermDocFreq; |
| |
| /** Field we are uninverting. */ |
| protected final String field; |
| |
| /** Number of terms in the field. */ |
| protected int numTermsInField; |
| |
| /** Total number of references to term numbers. */ |
| protected long termInstances; |
| private long memsz; |
| |
| /** Total time to uninvert the field. */ |
| protected int total_time; |
| |
| /** Time for phase1 of the uninvert process. */ |
| protected int phase1_time; |
| |
| /** Holds the per-document ords or a pointer to the ords. */ |
| protected int[] index; |
| |
| /** Holds term ords for documents. */ |
| protected byte[][] tnums = new byte[256][]; |
| |
| /** Total bytes (sum of term lengths) for all indexed terms.*/ |
| protected long sizeOfIndexedStrings; |
| |
| /** Holds the indexed (by default every 128th) terms. */ |
| protected BytesRef[] indexedTermsArray; |
| |
| /** If non-null, only terms matching this prefix were |
| * indexed. */ |
| protected BytesRef prefix; |
| |
| /** Ordinal of the first term in the field, or 0 if the |
| * {@link PostingsFormat} does not implement {@link |
| * TermsEnum#ord}. */ |
| protected int ordBase; |
| |
| /** Used while uninverting. */ |
| protected DocsEnum docsEnum; |
| |
| /** Returns total bytes used. */ |
| public long ramUsedInBytes() { |
| // can cache the mem size since it shouldn't change |
| if (memsz!=0) return memsz; |
| long sz = 8*8 + 32; // local fields |
| if (index != null) sz += index.length * 4; |
| if (tnums!=null) { |
| for (byte[] arr : tnums) |
| if (arr != null) sz += arr.length; |
| } |
| memsz = sz; |
| return sz; |
| } |
| |
| /** Inverts all terms */ |
| public DocTermOrds(AtomicReader reader, Bits liveDocs, String field) throws IOException { |
| this(reader, liveDocs, field, null, Integer.MAX_VALUE); |
| } |
| |
| /** Inverts only terms starting w/ prefix */ |
| public DocTermOrds(AtomicReader reader, Bits liveDocs, String field, BytesRef termPrefix) throws IOException { |
| this(reader, liveDocs, field, termPrefix, Integer.MAX_VALUE); |
| } |
| |
| /** Inverts only terms starting w/ prefix, and only terms |
| * whose docFreq (not taking deletions into account) is |
| * <= maxTermDocFreq */ |
| public DocTermOrds(AtomicReader reader, Bits liveDocs, String field, BytesRef termPrefix, int maxTermDocFreq) throws IOException { |
| this(reader, liveDocs, field, termPrefix, maxTermDocFreq, DEFAULT_INDEX_INTERVAL_BITS); |
| } |
| |
| /** Inverts only terms starting w/ prefix, and only terms |
| * whose docFreq (not taking deletions into account) is |
| * <= maxTermDocFreq, with a custom indexing interval |
| * (default is every 128nd term). */ |
| public DocTermOrds(AtomicReader reader, Bits liveDocs, String field, BytesRef termPrefix, int maxTermDocFreq, int indexIntervalBits) throws IOException { |
| this(field, maxTermDocFreq, indexIntervalBits); |
| uninvert(reader, liveDocs, termPrefix); |
| } |
| |
| /** Subclass inits w/ this, but be sure you then call |
| * uninvert, only once */ |
| protected DocTermOrds(String field, int maxTermDocFreq, int indexIntervalBits) { |
| //System.out.println("DTO init field=" + field + " maxTDFreq=" + maxTermDocFreq); |
| this.field = field; |
| this.maxTermDocFreq = maxTermDocFreq; |
| this.indexIntervalBits = indexIntervalBits; |
| indexIntervalMask = 0xffffffff >>> (32-indexIntervalBits); |
| indexInterval = 1 << indexIntervalBits; |
| } |
| |
| /** Returns a TermsEnum that implements ord. If the |
| * provided reader supports ord, we just return its |
| * TermsEnum; if it does not, we build a "private" terms |
| * index internally (WARNING: consumes RAM) and use that |
| * index to implement ord. This also enables ord on top |
| * of a composite reader. The returned TermsEnum is |
| * unpositioned. This returns null if there are no terms. |
| * |
| * <p><b>NOTE</b>: you must pass the same reader that was |
| * used when creating this class */ |
| public TermsEnum getOrdTermsEnum(AtomicReader reader) throws IOException { |
| if (indexedTermsArray == null) { |
| //System.out.println("GET normal enum"); |
| final Fields fields = reader.fields(); |
| if (fields == null) { |
| return null; |
| } |
| final Terms terms = fields.terms(field); |
| if (terms == null) { |
| return null; |
| } else { |
| return terms.iterator(null); |
| } |
| } else { |
| //System.out.println("GET wrapped enum ordBase=" + ordBase); |
| return new OrdWrappedTermsEnum(reader); |
| } |
| } |
| |
| /** |
| * Returns the number of terms in this field |
| */ |
| public int numTerms() { |
| return numTermsInField; |
| } |
| |
| /** |
| * Returns {@code true} if no terms were indexed. |
| */ |
| public boolean isEmpty() { |
| return index == null; |
| } |
| |
| /** Subclass can override this */ |
| protected void visitTerm(TermsEnum te, int termNum) throws IOException { |
| } |
| |
| /** Invoked during {@link #uninvert(AtomicReader,Bits,BytesRef)} |
| * to record the document frequency for each uninverted |
| * term. */ |
| protected void setActualDocFreq(int termNum, int df) throws IOException { |
| } |
| |
| /** Call this only once (if you subclass!) */ |
| protected void uninvert(final AtomicReader reader, Bits liveDocs, final BytesRef termPrefix) throws IOException { |
| final FieldInfo info = reader.getFieldInfos().fieldInfo(field); |
| if (info != null && info.hasDocValues()) { |
| throw new IllegalStateException("Type mismatch: " + field + " was indexed as " + info.getDocValuesType()); |
| } |
| //System.out.println("DTO uninvert field=" + field + " prefix=" + termPrefix); |
| final long startTime = System.currentTimeMillis(); |
| prefix = termPrefix == null ? null : BytesRef.deepCopyOf(termPrefix); |
| |
| final int maxDoc = reader.maxDoc(); |
| final int[] index = new int[maxDoc]; // immediate term numbers, or the index into the byte[] representing the last number |
| final int[] lastTerm = new int[maxDoc]; // last term we saw for this document |
| final byte[][] bytes = new byte[maxDoc][]; // list of term numbers for the doc (delta encoded vInts) |
| |
| final Fields fields = reader.fields(); |
| if (fields == null) { |
| // No terms |
| return; |
| } |
| final Terms terms = fields.terms(field); |
| if (terms == null) { |
| // No terms |
| return; |
| } |
| |
| final TermsEnum te = terms.iterator(null); |
| final BytesRef seekStart = termPrefix != null ? termPrefix : new BytesRef(); |
| //System.out.println("seekStart=" + seekStart.utf8ToString()); |
| if (te.seekCeil(seekStart) == TermsEnum.SeekStatus.END) { |
| // No terms match |
| return; |
| } |
| |
| // If we need our "term index wrapper", these will be |
| // init'd below: |
| List<BytesRef> indexedTerms = null; |
| PagedBytes indexedTermsBytes = null; |
| |
| boolean testedOrd = false; |
| |
| // we need a minimum of 9 bytes, but round up to 12 since the space would |
| // be wasted with most allocators anyway. |
| byte[] tempArr = new byte[12]; |
| |
| // |
| // enumerate all terms, and build an intermediate form of the un-inverted field. |
| // |
| // During this intermediate form, every document has a (potential) byte[] |
| // and the int[maxDoc()] array either contains the termNumber list directly |
| // or the *end* offset of the termNumber list in it's byte array (for faster |
| // appending and faster creation of the final form). |
| // |
| // idea... if things are too large while building, we could do a range of docs |
| // at a time (but it would be a fair amount slower to build) |
| // could also do ranges in parallel to take advantage of multiple CPUs |
| |
| // OPTIONAL: remap the largest df terms to the lowest 128 (single byte) |
| // values. This requires going over the field first to find the most |
| // frequent terms ahead of time. |
| |
| int termNum = 0; |
| docsEnum = null; |
| |
| // Loop begins with te positioned to first term (we call |
| // seek above): |
| for (;;) { |
| final BytesRef t = te.term(); |
| if (t == null || (termPrefix != null && !StringHelper.startsWith(t, termPrefix))) { |
| break; |
| } |
| //System.out.println("visit term=" + t.utf8ToString() + " " + t + " termNum=" + termNum); |
| |
| if (!testedOrd) { |
| try { |
| ordBase = (int) te.ord(); |
| //System.out.println("got ordBase=" + ordBase); |
| } catch (UnsupportedOperationException uoe) { |
| // Reader cannot provide ord support, so we wrap |
| // our own support by creating our own terms index: |
| indexedTerms = new ArrayList<>(); |
| indexedTermsBytes = new PagedBytes(15); |
| //System.out.println("NO ORDS"); |
| } |
| testedOrd = true; |
| } |
| |
| visitTerm(te, termNum); |
| |
| if (indexedTerms != null && (termNum & indexIntervalMask) == 0) { |
| // Index this term |
| sizeOfIndexedStrings += t.length; |
| BytesRef indexedTerm = new BytesRef(); |
| indexedTermsBytes.copy(t, indexedTerm); |
| // TODO: really should 1) strip off useless suffix, |
| // and 2) use FST not array/PagedBytes |
| indexedTerms.add(indexedTerm); |
| } |
| |
| final int df = te.docFreq(); |
| if (df <= maxTermDocFreq) { |
| |
| docsEnum = te.docs(liveDocs, docsEnum, DocsEnum.FLAG_NONE); |
| |
| // dF, but takes deletions into account |
| int actualDF = 0; |
| |
| for (;;) { |
| int doc = docsEnum.nextDoc(); |
| if (doc == DocIdSetIterator.NO_MORE_DOCS) { |
| break; |
| } |
| //System.out.println(" chunk=" + chunk + " docs"); |
| |
| actualDF ++; |
| termInstances++; |
| |
| //System.out.println(" docID=" + doc); |
| // add TNUM_OFFSET to the term number to make room for special reserved values: |
| // 0 (end term) and 1 (index into byte array follows) |
| int delta = termNum - lastTerm[doc] + TNUM_OFFSET; |
| lastTerm[doc] = termNum; |
| int val = index[doc]; |
| |
| if ((val & 0xff)==1) { |
| // index into byte array (actually the end of |
| // the doc-specific byte[] when building) |
| int pos = val >>> 8; |
| int ilen = vIntSize(delta); |
| byte[] arr = bytes[doc]; |
| int newend = pos+ilen; |
| if (newend > arr.length) { |
| // We avoid a doubling strategy to lower memory usage. |
| // this faceting method isn't for docs with many terms. |
| // In hotspot, objects have 2 words of overhead, then fields, rounded up to a 64-bit boundary. |
| // TODO: figure out what array lengths we can round up to w/o actually using more memory |
| // (how much space does a byte[] take up? Is data preceded by a 32 bit length only? |
| // It should be safe to round up to the nearest 32 bits in any case. |
| int newLen = (newend + 3) & 0xfffffffc; // 4 byte alignment |
| byte[] newarr = new byte[newLen]; |
| System.arraycopy(arr, 0, newarr, 0, pos); |
| arr = newarr; |
| bytes[doc] = newarr; |
| } |
| pos = writeInt(delta, arr, pos); |
| index[doc] = (pos<<8) | 1; // update pointer to end index in byte[] |
| } else { |
| // OK, this int has data in it... find the end (a zero starting byte - not |
| // part of another number, hence not following a byte with the high bit set). |
| int ipos; |
| if (val==0) { |
| ipos=0; |
| } else if ((val & 0x0000ff80)==0) { |
| ipos=1; |
| } else if ((val & 0x00ff8000)==0) { |
| ipos=2; |
| } else if ((val & 0xff800000)==0) { |
| ipos=3; |
| } else { |
| ipos=4; |
| } |
| |
| //System.out.println(" ipos=" + ipos); |
| |
| int endPos = writeInt(delta, tempArr, ipos); |
| //System.out.println(" endpos=" + endPos); |
| if (endPos <= 4) { |
| //System.out.println(" fits!"); |
| // value will fit in the integer... move bytes back |
| for (int j=ipos; j<endPos; j++) { |
| val |= (tempArr[j] & 0xff) << (j<<3); |
| } |
| index[doc] = val; |
| } else { |
| // value won't fit... move integer into byte[] |
| for (int j=0; j<ipos; j++) { |
| tempArr[j] = (byte)val; |
| val >>>=8; |
| } |
| // point at the end index in the byte[] |
| index[doc] = (endPos<<8) | 1; |
| bytes[doc] = tempArr; |
| tempArr = new byte[12]; |
| } |
| } |
| } |
| setActualDocFreq(termNum, actualDF); |
| } |
| |
| termNum++; |
| if (te.next() == null) { |
| break; |
| } |
| } |
| |
| numTermsInField = termNum; |
| |
| long midPoint = System.currentTimeMillis(); |
| |
| if (termInstances == 0) { |
| // we didn't invert anything |
| // lower memory consumption. |
| tnums = null; |
| } else { |
| |
| this.index = index; |
| |
| // |
| // transform intermediate form into the final form, building a single byte[] |
| // at a time, and releasing the intermediate byte[]s as we go to avoid |
| // increasing the memory footprint. |
| // |
| |
| for (int pass = 0; pass<256; pass++) { |
| byte[] target = tnums[pass]; |
| int pos=0; // end in target; |
| if (target != null) { |
| pos = target.length; |
| } else { |
| target = new byte[4096]; |
| } |
| |
| // loop over documents, 0x00ppxxxx, 0x01ppxxxx, 0x02ppxxxx |
| // where pp is the pass (which array we are building), and xx is all values. |
| // each pass shares the same byte[] for termNumber lists. |
| for (int docbase = pass<<16; docbase<maxDoc; docbase+=(1<<24)) { |
| int lim = Math.min(docbase + (1<<16), maxDoc); |
| for (int doc=docbase; doc<lim; doc++) { |
| //System.out.println(" pass=" + pass + " process docID=" + doc); |
| int val = index[doc]; |
| if ((val&0xff) == 1) { |
| int len = val >>> 8; |
| //System.out.println(" ptr pos=" + pos); |
| index[doc] = (pos<<8)|1; // change index to point to start of array |
| if ((pos & 0xff000000) != 0) { |
| // we only have 24 bits for the array index |
| throw new IllegalStateException("Too many values for UnInvertedField faceting on field "+field); |
| } |
| byte[] arr = bytes[doc]; |
| /* |
| for(byte b : arr) { |
| //System.out.println(" b=" + Integer.toHexString((int) b)); |
| } |
| */ |
| bytes[doc] = null; // IMPORTANT: allow GC to avoid OOM |
| if (target.length <= pos + len) { |
| int newlen = target.length; |
| /*** we don't have to worry about the array getting too large |
| * since the "pos" param will overflow first (only 24 bits available) |
| if ((newlen<<1) <= 0) { |
| // overflow... |
| newlen = Integer.MAX_VALUE; |
| if (newlen <= pos + len) { |
| throw new SolrException(400,"Too many terms to uninvert field!"); |
| } |
| } else { |
| while (newlen <= pos + len) newlen<<=1; // doubling strategy |
| } |
| ****/ |
| while (newlen <= pos + len) newlen<<=1; // doubling strategy |
| byte[] newtarget = new byte[newlen]; |
| System.arraycopy(target, 0, newtarget, 0, pos); |
| target = newtarget; |
| } |
| System.arraycopy(arr, 0, target, pos, len); |
| pos += len + 1; // skip single byte at end and leave it 0 for terminator |
| } |
| } |
| } |
| |
| // shrink array |
| if (pos < target.length) { |
| byte[] newtarget = new byte[pos]; |
| System.arraycopy(target, 0, newtarget, 0, pos); |
| target = newtarget; |
| } |
| |
| tnums[pass] = target; |
| |
| if ((pass << 16) > maxDoc) |
| break; |
| } |
| |
| } |
| if (indexedTerms != null) { |
| indexedTermsArray = indexedTerms.toArray(new BytesRef[indexedTerms.size()]); |
| } |
| |
| long endTime = System.currentTimeMillis(); |
| |
| total_time = (int)(endTime-startTime); |
| phase1_time = (int)(midPoint-startTime); |
| } |
| |
| /** Number of bytes to represent an unsigned int as a vint. */ |
| private static int vIntSize(int x) { |
| if ((x & (0xffffffff << (7*1))) == 0 ) { |
| return 1; |
| } |
| if ((x & (0xffffffff << (7*2))) == 0 ) { |
| return 2; |
| } |
| if ((x & (0xffffffff << (7*3))) == 0 ) { |
| return 3; |
| } |
| if ((x & (0xffffffff << (7*4))) == 0 ) { |
| return 4; |
| } |
| return 5; |
| } |
| |
| // todo: if we know the size of the vInt already, we could do |
| // a single switch on the size |
| private static int writeInt(int x, byte[] arr, int pos) { |
| int a; |
| a = (x >>> (7*4)); |
| if (a != 0) { |
| arr[pos++] = (byte)(a | 0x80); |
| } |
| a = (x >>> (7*3)); |
| if (a != 0) { |
| arr[pos++] = (byte)(a | 0x80); |
| } |
| a = (x >>> (7*2)); |
| if (a != 0) { |
| arr[pos++] = (byte)(a | 0x80); |
| } |
| a = (x >>> (7*1)); |
| if (a != 0) { |
| arr[pos++] = (byte)(a | 0x80); |
| } |
| arr[pos++] = (byte)(x & 0x7f); |
| return pos; |
| } |
| |
| /* Only used if original IndexReader doesn't implement |
| * ord; in this case we "wrap" our own terms index |
| * around it. */ |
| private final class OrdWrappedTermsEnum extends TermsEnum { |
| private final TermsEnum termsEnum; |
| private BytesRef term; |
| private long ord = -indexInterval-1; // force "real" seek |
| |
| public OrdWrappedTermsEnum(AtomicReader reader) throws IOException { |
| assert indexedTermsArray != null; |
| termsEnum = reader.fields().terms(field).iterator(null); |
| } |
| |
| @Override |
| public DocsEnum docs(Bits liveDocs, DocsEnum reuse, int flags) throws IOException { |
| return termsEnum.docs(liveDocs, reuse, flags); |
| } |
| |
| @Override |
| public DocsAndPositionsEnum docsAndPositions(Bits liveDocs, DocsAndPositionsEnum reuse, int flags) throws IOException { |
| return termsEnum.docsAndPositions(liveDocs, reuse, flags); |
| } |
| |
| @Override |
| public BytesRef term() { |
| return term; |
| } |
| |
| @Override |
| public BytesRef next() throws IOException { |
| if (++ord < 0) { |
| ord = 0; |
| } |
| if (termsEnum.next() == null) { |
| term = null; |
| return null; |
| } |
| return setTerm(); // this is extra work if we know we are in bounds... |
| } |
| |
| @Override |
| public int docFreq() throws IOException { |
| return termsEnum.docFreq(); |
| } |
| |
| @Override |
| public long totalTermFreq() throws IOException { |
| return termsEnum.totalTermFreq(); |
| } |
| |
| @Override |
| public long ord() { |
| return ordBase + ord; |
| } |
| |
| @Override |
| public SeekStatus seekCeil(BytesRef target) throws IOException { |
| |
| // already here |
| if (term != null && term.equals(target)) { |
| return SeekStatus.FOUND; |
| } |
| |
| int startIdx = Arrays.binarySearch(indexedTermsArray, target); |
| |
| if (startIdx >= 0) { |
| // we hit the term exactly... lucky us! |
| TermsEnum.SeekStatus seekStatus = termsEnum.seekCeil(target); |
| assert seekStatus == TermsEnum.SeekStatus.FOUND; |
| ord = startIdx << indexIntervalBits; |
| setTerm(); |
| assert term != null; |
| return SeekStatus.FOUND; |
| } |
| |
| // we didn't hit the term exactly |
| startIdx = -startIdx-1; |
| |
| if (startIdx == 0) { |
| // our target occurs *before* the first term |
| TermsEnum.SeekStatus seekStatus = termsEnum.seekCeil(target); |
| assert seekStatus == TermsEnum.SeekStatus.NOT_FOUND; |
| ord = 0; |
| setTerm(); |
| assert term != null; |
| return SeekStatus.NOT_FOUND; |
| } |
| |
| // back up to the start of the block |
| startIdx--; |
| |
| if ((ord >> indexIntervalBits) == startIdx && term != null && term.compareTo(target) <= 0) { |
| // we are already in the right block and the current term is before the term we want, |
| // so we don't need to seek. |
| } else { |
| // seek to the right block |
| TermsEnum.SeekStatus seekStatus = termsEnum.seekCeil(indexedTermsArray[startIdx]); |
| assert seekStatus == TermsEnum.SeekStatus.FOUND; |
| ord = startIdx << indexIntervalBits; |
| setTerm(); |
| assert term != null; // should be non-null since it's in the index |
| } |
| |
| while (term != null && term.compareTo(target) < 0) { |
| next(); |
| } |
| |
| if (term == null) { |
| return SeekStatus.END; |
| } else if (term.compareTo(target) == 0) { |
| return SeekStatus.FOUND; |
| } else { |
| return SeekStatus.NOT_FOUND; |
| } |
| } |
| |
| @Override |
| public void seekExact(long targetOrd) throws IOException { |
| int delta = (int) (targetOrd - ordBase - ord); |
| //System.out.println(" seek(ord) targetOrd=" + targetOrd + " delta=" + delta + " ord=" + ord + " ii=" + indexInterval); |
| if (delta < 0 || delta > indexInterval) { |
| final int idx = (int) (targetOrd >>> indexIntervalBits); |
| final BytesRef base = indexedTermsArray[idx]; |
| //System.out.println(" do seek term=" + base.utf8ToString()); |
| ord = idx << indexIntervalBits; |
| delta = (int) (targetOrd - ord); |
| final TermsEnum.SeekStatus seekStatus = termsEnum.seekCeil(base); |
| assert seekStatus == TermsEnum.SeekStatus.FOUND; |
| } else { |
| //System.out.println("seek w/in block"); |
| } |
| |
| while (--delta >= 0) { |
| BytesRef br = termsEnum.next(); |
| if (br == null) { |
| assert false; |
| return; |
| } |
| ord++; |
| } |
| |
| setTerm(); |
| assert term != null; |
| } |
| |
| private BytesRef setTerm() throws IOException { |
| term = termsEnum.term(); |
| //System.out.println(" setTerm() term=" + term.utf8ToString() + " vs prefix=" + (prefix == null ? "null" : prefix.utf8ToString())); |
| if (prefix != null && !StringHelper.startsWith(term, prefix)) { |
| term = null; |
| } |
| return term; |
| } |
| } |
| |
| /** Returns the term ({@link BytesRef}) corresponding to |
| * the provided ordinal. */ |
| public BytesRef lookupTerm(TermsEnum termsEnum, int ord) throws IOException { |
| termsEnum.seekExact(ord); |
| return termsEnum.term(); |
| } |
| |
| /** Returns a SortedSetDocValues view of this instance */ |
| public SortedSetDocValues iterator(AtomicReader reader) throws IOException { |
| if (isEmpty()) { |
| return DocValues.EMPTY_SORTED_SET; |
| } else { |
| return new Iterator(reader); |
| } |
| } |
| |
| private class Iterator extends SortedSetDocValues { |
| final AtomicReader reader; |
| final TermsEnum te; // used internally for lookupOrd() and lookupTerm() |
| // currently we read 5 at a time (using the logic of the old iterator) |
| final int buffer[] = new int[5]; |
| int bufferUpto; |
| int bufferLength; |
| |
| private int tnum; |
| private int upto; |
| private byte[] arr; |
| |
| Iterator(AtomicReader reader) throws IOException { |
| this.reader = reader; |
| this.te = termsEnum(); |
| } |
| |
| @Override |
| public long nextOrd() { |
| while (bufferUpto == bufferLength) { |
| if (bufferLength < buffer.length) { |
| return NO_MORE_ORDS; |
| } else { |
| bufferLength = read(buffer); |
| bufferUpto = 0; |
| } |
| } |
| return buffer[bufferUpto++]; |
| } |
| |
| /** Buffer must be at least 5 ints long. Returns number |
| * of term ords placed into buffer; if this count is |
| * less than buffer.length then that is the end. */ |
| int read(int[] buffer) { |
| int bufferUpto = 0; |
| if (arr == null) { |
| // code is inlined into upto |
| //System.out.println("inlined"); |
| int code = upto; |
| int delta = 0; |
| for (;;) { |
| delta = (delta << 7) | (code & 0x7f); |
| if ((code & 0x80)==0) { |
| if (delta==0) break; |
| tnum += delta - TNUM_OFFSET; |
| buffer[bufferUpto++] = ordBase+tnum; |
| //System.out.println(" tnum=" + tnum); |
| delta = 0; |
| } |
| code >>>= 8; |
| } |
| } else { |
| // code is a pointer |
| for(;;) { |
| int delta = 0; |
| for(;;) { |
| byte b = arr[upto++]; |
| delta = (delta << 7) | (b & 0x7f); |
| //System.out.println(" cycle: upto=" + upto + " delta=" + delta + " b=" + b); |
| if ((b & 0x80) == 0) break; |
| } |
| //System.out.println(" delta=" + delta); |
| if (delta == 0) break; |
| tnum += delta - TNUM_OFFSET; |
| //System.out.println(" tnum=" + tnum); |
| buffer[bufferUpto++] = ordBase+tnum; |
| if (bufferUpto == buffer.length) { |
| break; |
| } |
| } |
| } |
| |
| return bufferUpto; |
| } |
| |
| @Override |
| public void setDocument(int docID) { |
| tnum = 0; |
| final int code = index[docID]; |
| if ((code & 0xff)==1) { |
| // a pointer |
| upto = code>>>8; |
| //System.out.println(" pointer! upto=" + upto); |
| int whichArray = (docID >>> 16) & 0xff; |
| arr = tnums[whichArray]; |
| } else { |
| //System.out.println(" inline!"); |
| arr = null; |
| upto = code; |
| } |
| bufferUpto = 0; |
| bufferLength = read(buffer); |
| } |
| |
| @Override |
| public void lookupOrd(long ord, BytesRef result) { |
| BytesRef ref = null; |
| try { |
| ref = DocTermOrds.this.lookupTerm(te, (int) ord); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| result.bytes = ref.bytes; |
| result.offset = ref.offset; |
| result.length = ref.length; |
| } |
| |
| @Override |
| public long getValueCount() { |
| return numTerms(); |
| } |
| |
| @Override |
| public long lookupTerm(BytesRef key) { |
| try { |
| if (te.seekCeil(key) == SeekStatus.FOUND) { |
| return te.ord(); |
| } else { |
| return -te.ord()-1; |
| } |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| @Override |
| public TermsEnum termsEnum() { |
| try { |
| return getOrdTermsEnum(reader); |
| } catch (IOException e) { |
| throw new RuntimeException(); |
| } |
| } |
| } |
| } |
