NUTCH-3032 Code for an ArbitraryIndexingFilter to index values resolved by user POJO code at index time

build.xml

@@ -203,6 +203,7 @@
       <packageset dir="${plugins.dir}/headings/src/java"/>
       <packageset dir="${plugins.dir}/exchange-jexl/src/java"/>
       <packageset dir="${plugins.dir}/index-anchor/src/java"/>
+      <packageset dir="${plugins.dir}/index-arbitrary/src/java"/>
       <packageset dir="${plugins.dir}/index-basic/src/java"/>
       <packageset dir="${plugins.dir}/index-geoip/src/java"/>
       <packageset dir="${plugins.dir}/index-jexl-filter/src/java"/>
@@ -646,6 +647,7 @@
       <packageset dir="${plugins.dir}/headings/src/java"/>
       <packageset dir="${plugins.dir}/exchange-jexl/src/java"/>
       <packageset dir="${plugins.dir}/index-anchor/src/java"/>
+      <packageset dir="${plugins.dir}/index-arbitrary/src/java"/>
       <packageset dir="${plugins.dir}/index-basic/src/java"/>
       <packageset dir="${plugins.dir}/index-geoip/src/java"/>
       <packageset dir="${plugins.dir}/index-jexl-filter/src/java"/>
@@ -1173,6 +1175,8 @@
         <source path="${plugins.dir}/exchange-jexl/src/java/" />
         <source path="${plugins.dir}/index-anchor/src/java/" />
         <source path="${plugins.dir}/index-anchor/src/test/" />
+        <source path="${plugins.dir}/index-arbitrary/src/java/" />
+        <source path="${plugins.dir}/index-arbitrary/src/test/" />
         <source path="${plugins.dir}/index-basic/src/java/" />
         <source path="${plugins.dir}/index-basic/src/test/" />
         <source path="${plugins.dir}/index-geoip/src/java/" />

conf/nutch-default.xml

@@ -2252,6 +2252,72 @@ CAUTION: Set the parser.timeout to -1 or a bigger value than 30, when using this
   </description>
 </property>
 
+<!-- index-arbitrary plugin properties -->
+<property>
+  <name>index.arbitrary.function.count</name>
+  <value></value>
+  <description>The count of arbitrary additions/edits to the document.
+    Specify the remaining properties (fieldName, className, constructorArgs,
+    methodName, and methodArgs) independently in this file by appending a
+    dot (.) followed by integer numerals (beginning with '0') to the property
+    names, e.g.:
+
+    index.arbitrary.fieldName.0
+    for the field to add/set with the first arbitrary addition or:
+
+    index.arbitrary.className.3
+    for the POJO class name to use in setting the fourth arbitrary addition.
+  </description>
+</property>
+
+<property>
+  <name>index.arbitrary.fieldName.0</name>
+  <value></value>
+  <description>The name of the field to add to the document with the value
+    returned from the custom POJO.</description>
+</property>
+
+<property>
+  <name>index.arbitrary.className.0</name>
+  <value></value>
+  <description>The fully qualified name of the POJO class that will supply
+    values for the new field.</description>
+</property>
+
+<property>
+  <name>index.arbitrary.constructorArgs.0</name>
+  <value></value>
+  <description>The values (as strings) to pass into the POJO constructor.
+    The POJO must accept a String representation of the NutchDocument's URL
+    as the first parameter in the constructor. The values you specify here 
+    will populate the constructor arguments 1,..,n-1 where n=the count of
+    arguments to the constructor. Argument #0 will be the NutchDocument's URL.
+  </description>
+</property>
+
+<property>
+  <name>index.arbitrary.methodName.0</name>
+  <value></value>
+  <description>The name of the method to invoke on the instance of your custom
+    class in order to determine the value to add to the document.</description>
+  </property>
+
+<property>
+  <name>index.arbitrary.methodArgs.0</name>
+  <value></value>
+  <description>The values (as strings) to pass into the named method on the POJO
+    instance. Unlike the constructor args, there is no required argument that this
+    method in the POJO must accept, i.e., the Arbitrary Indexer doesn't supply any
+    arguments taken from the NutchDocument values by default.</description>
+</property>
+
+<property>
+  <name>index.arbitrary.overwrite.0</name>
+  <description>Whether to overwrite any existing value in the doc for
+    for fieldName. Default is false if not specified in config</description>
+  <value></value>
+</property>
+
 <!-- parse-metatags plugin properties -->
 <property>
   <name>metatags.names</name>

src/plugin/build.xml

@@ -40,6 +40,7 @@
     <ant dir="headings" target="deploy"/>
     <ant dir="exchange-jexl" target="deploy"/>
     <ant dir="index-anchor" target="deploy"/>
+    <ant dir="index-arbitrary" target="deploy"/>
     <ant dir="index-basic" target="deploy"/>
     <ant dir="index-geoip" target="deploy"/>
     <ant dir="index-jexl-filter" target="deploy"/>
@@ -117,6 +118,7 @@
      <ant dir="feed" target="test"/>
      <ant dir="headings" target="test"/>
      <ant dir="index-anchor" target="test"/>
+     <ant dir="index-arbitrary" target="test"/>
      <ant dir="index-basic" target="test"/>
      <!--ant dir="index-geoip" target="test"/-->
      <ant dir="index-jexl-filter" target="test"/>
@@ -179,6 +181,7 @@
     <ant dir="headings" target="clean"/>
     <ant dir="exchange-jexl" target="clean"/>
     <ant dir="index-anchor" target="clean"/>
+    <ant dir="index-arbitrary" target="clean"/>
     <ant dir="index-basic" target="clean"/>
     <ant dir="index-geoip" target="clean"/>
     <ant dir="index-jexl-filter" target="clean"/>

src/plugin/index-arbitrary/build.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0"?>
+<!--
+   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.
+-->
+<project name="index-arbitrary" default="jar-core">
+
+  <import file="../build-plugin.xml"/>
+
+</project>

src/plugin/index-arbitrary/ivy.xml

@@ -0,0 +1,39 @@
+<?xml version="1.0" ?>
+<!--
+   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.
+-->
+<ivy-module version="1.0">
+  <info organisation="org.apache.nutch" module="${ant.project.name}">
+    <license name="Apache 2.0"/>
+    <ivyauthor name="Apache Nutch Team" url="https://nutch.apache.org/"/>
+    <description>
+        Apache Nutch
+    </description>
+  </info>
+
+  <configurations>
+    <include file="../../../ivy/ivy-configurations.xml"/>
+  </configurations>
+
+  <publications>
+    <!--get the artifact from our module name-->
+    <artifact conf="master"/>
+  </publications>
+
+  <dependencies>
+  </dependencies>
+
+</ivy-module>

src/plugin/index-arbitrary/plugin.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ 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.
+-->
+<plugin
+    id="index-arbitrary"
+    name="Index Arbitrary"
+    version="1.0.0"
+    provider-name="nutch.org">
+
+  <runtime>
+    <library name="index-arbitrary.jar">
+      <export name="*"/>
+    </library>
+  </runtime>
+
+  <requires>
+    <import plugin="nutch-extensionpoints"/>
+  </requires>
+
+
+  <extension id="org.apache.nutch.indexer.arbitrary"
+    name="Nutch arbitrary data indexer"
+    point="org.apache.nutch.indexer.IndexingFilter">
+    <implementation id="ArbitraryIndexingFilter"
+     class="org.apache.nutch.indexer.arbitrary.ArbitraryIndexingFilter"/>
+  </extension>
+
+</plugin>