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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 org.apache.lucene.store.DataInput;
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import org.apache.lucene.store.DataOutput;
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* Use this if you just want to build an FSA.
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* @lucene.experimental
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public final class NoOutputs extends Outputs<Object> {
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static final Object NO_OUTPUT = new Object() {
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// NodeHash calls hashCode for this output; we fix this
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// so we get deterministic hashing.
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public int hashCode() {
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public boolean equals(Object other) {
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private static final NoOutputs singleton = new NoOutputs();
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public static NoOutputs getSingleton() {
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public Object common(Object output1, Object output2) {
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assert output1 == NO_OUTPUT;
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assert output2 == NO_OUTPUT;
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public Object subtract(Object output, Object inc) {
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assert output == NO_OUTPUT;
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assert inc == NO_OUTPUT;
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public Object add(Object prefix, Object output) {
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assert prefix == NO_OUTPUT: "got " + prefix;
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assert output == NO_OUTPUT;
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public void write(Object prefix, DataOutput out) {
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public Object read(DataInput in) {
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public Object getNoOutput() {
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public String outputToString(Object output) {