+++ /dev/null
-package org.apache.lucene.util.fst;
-
-/**
- * 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.DataInput;
-import org.apache.lucene.store.DataOutput;
-
-/**
- * Holds one or two longs for each input term. If it's a
- * single output, Long is returned; else, TwoLongs. Order
- * is preseved in the TwoLongs case, ie .first is the first
- * input/output added to Builder, and .second is the
- * second. You cannot store 0 output with this (that's
- * reserved to mean "no output")!
- *
- * NOTE: the resulting FST is not guaranteed to be minimal!
- * See {@link Builder}.
- *
- * @lucene.experimental
- */
-
-public final class UpToTwoPositiveIntOutputs extends Outputs<Object> {
-
- public final static class TwoLongs {
- final long first;
- final long second;
-
- public TwoLongs(long first, long second) {
- this.first = first;
- this.second = second;
- assert first >= 0;
- assert second >= 0;
- }
-
- @Override
- public String toString() {
- return "TwoLongs:" + first + "," + second;
- }
-
- @Override
- public boolean equals(Object _other) {
- if (_other instanceof TwoLongs) {
- final TwoLongs other = (TwoLongs) _other;
- return first == other.first && second == other.second;
- } else {
- return false;
- }
- }
-
- @Override
- public int hashCode() {
- return (int) ((first^(first>>>32)) ^ (second^(second>>32)));
- }
- }
-
- private final static Long NO_OUTPUT = new Long(0);
-
- private final boolean doShare;
-
- private final static UpToTwoPositiveIntOutputs singletonShare = new UpToTwoPositiveIntOutputs(true);
- private final static UpToTwoPositiveIntOutputs singletonNoShare = new UpToTwoPositiveIntOutputs(false);
-
- private UpToTwoPositiveIntOutputs(boolean doShare) {
- this.doShare = doShare;
- }
-
- public static UpToTwoPositiveIntOutputs getSingleton(boolean doShare) {
- return doShare ? singletonShare : singletonNoShare;
- }
-
- public Long get(long v) {
- if (v == 0) {
- return NO_OUTPUT;
- } else {
- return Long.valueOf(v);
- }
- }
-
- public TwoLongs get(long first, long second) {
- return new TwoLongs(first, second);
- }
-
- @Override
- public Long common(Object _output1, Object _output2) {
- assert valid(_output1, false);
- assert valid(_output2, false);
- final Long output1 = (Long) _output1;
- final Long output2 = (Long) _output2;
- if (output1 == NO_OUTPUT || output2 == NO_OUTPUT) {
- return NO_OUTPUT;
- } else if (doShare) {
- assert output1 > 0;
- assert output2 > 0;
- return Math.min(output1, output2);
- } else if (output1.equals(output2)) {
- return output1;
- } else {
- return NO_OUTPUT;
- }
- }
-
- @Override
- public Long subtract(Object _output, Object _inc) {
- assert valid(_output, false);
- assert valid(_inc, false);
- final Long output = (Long) _output;
- final Long inc = (Long) _inc;
- assert output >= inc;
-
- if (inc == NO_OUTPUT) {
- return output;
- } else if (output.equals(inc)) {
- return NO_OUTPUT;
- } else {
- return output - inc;
- }
- }
-
- @Override
- public Object add(Object _prefix, Object _output) {
- assert valid(_prefix, false);
- assert valid(_output, true);
- final Long prefix = (Long) _prefix;
- if (_output instanceof Long) {
- final Long output = (Long) _output;
- if (prefix == NO_OUTPUT) {
- return output;
- } else if (output == NO_OUTPUT) {
- return prefix;
- } else {
- return prefix + output;
- }
- } else {
- final TwoLongs output = (TwoLongs) _output;
- final long v = prefix;
- return new TwoLongs(output.first + v, output.second + v);
- }
- }
-
- @Override
- public void write(Object _output, DataOutput out) throws IOException {
- assert valid(_output, true);
- if (_output instanceof Long) {
- final Long output = (Long) _output;
- out.writeVLong(output<<1);
- } else {
- final TwoLongs output = (TwoLongs) _output;
- out.writeVLong((output.first<<1) | 1);
- out.writeVLong(output.second);
- }
- }
-
- @Override
- public Object read(DataInput in) throws IOException {
- final long code = in.readVLong();
- if ((code & 1) == 0) {
- // single long
- final long v = code >>> 1;
- if (v == 0) {
- return NO_OUTPUT;
- } else {
- return Long.valueOf(v);
- }
- } else {
- // two longs
- final long first = code >>> 1;
- final long second = in.readVLong();
- return new TwoLongs(first, second);
- }
- }
-
- private boolean valid(Long o) {
- assert o != null;
- assert o instanceof Long;
- assert o == NO_OUTPUT || o > 0;
- return true;
- }
-
- // Used only by assert
- private boolean valid(Object _o, boolean allowDouble) {
- if (!allowDouble) {
- assert _o instanceof Long;
- return valid((Long) _o);
- } else if (_o instanceof TwoLongs) {
- return true;
- } else {
- return valid((Long) _o);
- }
- }
-
- @Override
- public Object getNoOutput() {
- return NO_OUTPUT;
- }
-
- @Override
- public String outputToString(Object output) {
- return output.toString();
- }
-
- @Override
- public Object merge(Object first, Object second) {
- assert valid(first, false);
- assert valid(second, false);
- return new TwoLongs((Long) first, (Long) second);
- }
-}
fnp / pylucene.git / blobdiff