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package org.apache.lucene.util.fst;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.io.IOException;
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import org.apache.lucene.store.DataInput;
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import org.apache.lucene.store.DataOutput;
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* Holds one or two longs for each input term. If it's a
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* single output, Long is returned; else, TwoLongs. Order
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* is preseved in the TwoLongs case, ie .first is the first
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* input/output added to Builder, and .second is the
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* second. You cannot store 0 output with this (that's
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* reserved to mean "no output")!
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* NOTE: the resulting FST is not guaranteed to be minimal!
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* See {@link Builder}.
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* @lucene.experimental
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public final class UpToTwoPositiveIntOutputs extends Outputs<Object> {
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public final static class TwoLongs {
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public TwoLongs(long first, long second) {
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public String toString() {
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return "TwoLongs:" + first + "," + second;
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public boolean equals(Object _other) {
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if (_other instanceof TwoLongs) {
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final TwoLongs other = (TwoLongs) _other;
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return first == other.first && second == other.second;
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public int hashCode() {
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return (int) ((first^(first>>>32)) ^ (second^(second>>32)));
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private final static Long NO_OUTPUT = new Long(0);
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private final boolean doShare;
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private final static UpToTwoPositiveIntOutputs singletonShare = new UpToTwoPositiveIntOutputs(true);
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private final static UpToTwoPositiveIntOutputs singletonNoShare = new UpToTwoPositiveIntOutputs(false);
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private UpToTwoPositiveIntOutputs(boolean doShare) {
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this.doShare = doShare;
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public static UpToTwoPositiveIntOutputs getSingleton(boolean doShare) {
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return doShare ? singletonShare : singletonNoShare;
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public Long get(long v) {
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return Long.valueOf(v);
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public TwoLongs get(long first, long second) {
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return new TwoLongs(first, second);
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public Long common(Object _output1, Object _output2) {
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assert valid(_output1, false);
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assert valid(_output2, false);
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final Long output1 = (Long) _output1;
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final Long output2 = (Long) _output2;
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if (output1 == NO_OUTPUT || output2 == NO_OUTPUT) {
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} else if (doShare) {
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return Math.min(output1, output2);
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} else if (output1.equals(output2)) {
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public Long subtract(Object _output, Object _inc) {
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assert valid(_output, false);
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assert valid(_inc, false);
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final Long output = (Long) _output;
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final Long inc = (Long) _inc;
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assert output >= inc;
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if (inc == NO_OUTPUT) {
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} else if (output.equals(inc)) {
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public Object add(Object _prefix, Object _output) {
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assert valid(_prefix, false);
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assert valid(_output, true);
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final Long prefix = (Long) _prefix;
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if (_output instanceof Long) {
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final Long output = (Long) _output;
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if (prefix == NO_OUTPUT) {
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} else if (output == NO_OUTPUT) {
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return prefix + output;
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final TwoLongs output = (TwoLongs) _output;
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final long v = prefix;
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return new TwoLongs(output.first + v, output.second + v);
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public void write(Object _output, DataOutput out) throws IOException {
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assert valid(_output, true);
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if (_output instanceof Long) {
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final Long output = (Long) _output;
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out.writeVLong(output<<1);
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final TwoLongs output = (TwoLongs) _output;
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out.writeVLong((output.first<<1) | 1);
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out.writeVLong(output.second);
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public Object read(DataInput in) throws IOException {
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final long code = in.readVLong();
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if ((code & 1) == 0) {
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final long v = code >>> 1;
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return Long.valueOf(v);
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final long first = code >>> 1;
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final long second = in.readVLong();
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return new TwoLongs(first, second);
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private boolean valid(Long o) {
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assert o instanceof Long;
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assert o == NO_OUTPUT || o > 0;
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// Used only by assert
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private boolean valid(Object _o, boolean allowDouble) {
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assert _o instanceof Long;
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return valid((Long) _o);
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} else if (_o instanceof TwoLongs) {
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return valid((Long) _o);
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public Object getNoOutput() {
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public String outputToString(Object output) {
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return output.toString();
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public Object merge(Object first, Object second) {
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assert valid(first, false);
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assert valid(second, false);
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return new TwoLongs((Long) first, (Long) second);