Class DefaultPhraseSlopQueryNodeProcessor
java.lang.Object
org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl
org.apache.lucene.queryparser.flexible.standard.processors.DefaultPhraseSlopQueryNodeProcessor
- All Implemented Interfaces:
QueryNodeProcessor
This processor verifies if
StandardQueryConfigHandler.ConfigurationKeys.PHRASE_SLOP is defined in the QueryConfigHandler. If it is, it looks for every TokenizedPhraseQueryNode and MultiPhraseQueryNode that does not have any SlopQueryNode applied to it and creates an
SlopQueryNode and apply to it. The new SlopQueryNode has the same slop value
defined in the configuration.- See Also:
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprotected QueryNodepostProcessNode(QueryNode node) This method is invoked for every node when walking up the tree.protected QueryNodepreProcessNode(QueryNode node) This method is invoked for every node when walking down the tree.Processes a query node tree.protected voidprocessChildren(QueryNode queryTree) This method is called every time a child is processed.setChildrenOrder(List<QueryNode> children) This method is invoked for every node that has at least on child.Methods inherited from class org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl
getQueryConfigHandler, setQueryConfigHandler
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Constructor Details
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DefaultPhraseSlopQueryNodeProcessor
public DefaultPhraseSlopQueryNodeProcessor()
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Method Details
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process
Description copied from interface:QueryNodeProcessorProcesses a query node tree. It may return the same or another query tree. I should never returnnull.- Specified by:
processin interfaceQueryNodeProcessor- Overrides:
processin classQueryNodeProcessorImpl- Parameters:
queryTree- tree root node- Returns:
- the processed query tree
- Throws:
QueryNodeException
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postProcessNode
Description copied from class:QueryNodeProcessorImplThis method is invoked for every node when walking up the tree.- Specified by:
postProcessNodein classQueryNodeProcessorImpl- Parameters:
node- node the query node to be post-processed- Returns:
- a query node
- Throws:
QueryNodeException- if something goes wrong during the query node processing
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preProcessNode
Description copied from class:QueryNodeProcessorImplThis method is invoked for every node when walking down the tree.- Specified by:
preProcessNodein classQueryNodeProcessorImpl- Parameters:
node- the query node to be pre-processed- Returns:
- a query node
- Throws:
QueryNodeException- if something goes wrong during the query node processing
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processChildren
Description copied from class:QueryNodeProcessorImplThis method is called every time a child is processed.- Overrides:
processChildrenin classQueryNodeProcessorImpl- Parameters:
queryTree- the query node child to be processed- Throws:
QueryNodeException- if something goes wrong during the query node processing
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setChildrenOrder
Description copied from class:QueryNodeProcessorImplThis method is invoked for every node that has at least on child. It's invoked right beforeQueryNodeProcessorImpl.postProcessNode(QueryNode)is invoked.- Specified by:
setChildrenOrderin classQueryNodeProcessorImpl- Parameters:
children- the list containing all current node's children- Returns:
- a new list containing all children that should be set to the current node
- Throws:
QueryNodeException- if something goes wrong during the query node processing
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