com.marklogic.mapreduce.functions.FieldValueCooccurrences Maven / Gradle / Ivy
/*
* Copyright (c) 2019 MarkLogic Corporation
*
* Licensed 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 com.marklogic.mapreduce.functions;
/**
* Wrapper class for the cts:field-value-co-occurrences lexicon
* function. Subclass this class to generate map input based on a lexicon.
*
*
* Use this class with {@link com.marklogic.mapreduce.KeyValueInputFormat}
* or {@link com.marklogic.mapreduce.ValueInputFormat}.
*
*
* To generate map input with the lexicon function,
* create a subclass of this class and provide implementations
* of the methods that correspond to the function parameters you
* want to include in the call.
*
*
* For details, see "Using a Lexicon to Generate Key-Value Pairs"
* in the MarkLogic Connector for Hadoop Developer's Guide.
* For an example, see
* {@link com.marklogic.mapreduce.examples.LinkCountCooccurrences}.
*
*
*
* All co-occurrences functions using this API do NOT preserve
* frequency order even if "frequency-order" option is specified.
*
*
* @author jchen
*/
public abstract class FieldValueCooccurrences extends CooccurrencesFunction {
/**
* Get the value for the $field-name-1 parameter to the
* lexicon function call, as a string. The string should
* result in an xs:QName when evaluated as XQuery.
*
* @return first element QName.
*/
public abstract String getFieldName1();
/**
* Get the value for the $field-name-2 parameter to the
* lexicon function call, as a string. The string should
* result in an xs:QName when evaluated as XQuery.
*
* @return first element QName.
*/
public abstract String getFieldName2();
@Override
void appendFunctionName(StringBuilder buf) {
buf.append("cts:field-value-co-occurrences");
}
@Override
void appendNamesParams(StringBuilder buf) {
// first element name
buf.append(getFieldName1()).append(",\n");
// second element name
buf.append(getFieldName2()).append(",\n");;
}
}