From 11a1b8c1a8fdca9f6314bd61695345737309b630 Mon Sep 17 00:00:00 2001
From: Simon Willnauer <simonw@apache.org>
Date: Wed, 17 Oct 2018 10:16:31 +0200
Subject: [PATCH] LUCENE-6572: Remove dependency on analyzer-common from
 highlighing

This makes a simplifed copy of LimitTokenOffsetFilter to the highlighting
module to detach the dependency on analyzer-common.
---
 lucene/highlighter/build.xml                  |  9 +++-
 .../highlight/LimitTokenOffsetFilter.java     | 52 +++++++++++++++++++
 .../lucene/search/highlight/TokenSources.java |  1 -
 3 files changed, 60 insertions(+), 2 deletions(-)
 create mode 100644 lucene/highlighter/src/java/org/apache/lucene/search/highlight/LimitTokenOffsetFilter.java

diff --git a/lucene/highlighter/build.xml b/lucene/highlighter/build.xml
index e0dfa7ef86f..ed6cc74be8a 100644
--- a/lucene/highlighter/build.xml
+++ b/lucene/highlighter/build.xml
@@ -32,10 +32,17 @@
     <pathelement path="${memory.jar}"/>
     <pathelement path="${queries.jar}"/>
     <pathelement path="${join.jar}"/>
-    <pathelement path="${analyzers-common.jar}"/>
     <path refid="base.classpath"/>
   </path>
 
+  <path id="test.classpath">
+    <pathelement path="${memory.jar}"/>
+    <pathelement path="${queries.jar}"/>
+    <pathelement path="${join.jar}"/>
+    <pathelement path="${analyzers-common.jar}"/>
+    <path refid="test.base.classpath"/>
+  </path>
+
   <target name="compile-core" depends="jar-memory,jar-queries,jar-join,jar-analyzers-common,common.compile-core" />
 
   <target name="javadocs" depends="javadocs-memory,compile-core,check-javadocs-uptodate"
diff --git a/lucene/highlighter/src/java/org/apache/lucene/search/highlight/LimitTokenOffsetFilter.java b/lucene/highlighter/src/java/org/apache/lucene/search/highlight/LimitTokenOffsetFilter.java
new file mode 100644
index 00000000000..149584e42d3
--- /dev/null
+++ b/lucene/highlighter/src/java/org/apache/lucene/search/highlight/LimitTokenOffsetFilter.java
@@ -0,0 +1,52 @@
+/*
+ * 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.search.highlight;
+
+import java.io.IOException;
+
+import org.apache.lucene.analysis.TokenFilter;
+import org.apache.lucene.analysis.TokenStream;
+import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
+
+/**
+ * This is a simplified version of org.apache.lucene.analysis.miscellaneous.LimitTokenOffsetFilter to prevent
+ * a dependency on analyzers-common.jar.
+ */
+final class LimitTokenOffsetFilter extends TokenFilter {
+
+  private final OffsetAttribute offsetAttrib = addAttribute(OffsetAttribute.class);
+  private int maxStartOffset;
+
+  LimitTokenOffsetFilter(TokenStream input, int maxStartOffset) {
+    super(input);
+    if (maxStartOffset < 0) {
+      throw new IllegalArgumentException("maxStartOffset must be >= zero");
+    }
+    this.maxStartOffset = maxStartOffset;
+  }
+
+  @Override
+  public boolean incrementToken() throws IOException {
+    if (!input.incrementToken()) {
+      return false;
+    }
+    if (offsetAttrib.startOffset() <= maxStartOffset) {
+      return true;
+    }
+    return false;
+  }
+}
diff --git a/lucene/highlighter/src/java/org/apache/lucene/search/highlight/TokenSources.java b/lucene/highlighter/src/java/org/apache/lucene/search/highlight/TokenSources.java
index 2730f40409a..0c0a63f9400 100644
--- a/lucene/highlighter/src/java/org/apache/lucene/search/highlight/TokenSources.java
+++ b/lucene/highlighter/src/java/org/apache/lucene/search/highlight/TokenSources.java
@@ -23,7 +23,6 @@ import java.io.IOException;
 
 import org.apache.lucene.analysis.Analyzer;
 import org.apache.lucene.analysis.TokenStream;
-import org.apache.lucene.analysis.miscellaneous.LimitTokenOffsetFilter;
 import org.apache.lucene.document.Document;
 import org.apache.lucene.index.Fields;
 import org.apache.lucene.index.IndexReader;