com.marklogic.mapreduce.functions.CooccurrencesFunction Maven / Gradle / Ivy
/*
* Copyright 2003-2019 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;
import java.util.Collection;
import java.util.Iterator;
/**
* Supper class of wrapper classes for supported co-occurrences lexicon
* functions, such as cts:element-value-co-occurrences.
*
*
* All co-occurrences functions using this API do NOT preserve
* frequency order even if "frequency-order" option is specified.
*
*
* @author jchen
*/
public abstract class CooccurrencesFunction extends LexiconFunction {
abstract void appendFunctionName(StringBuilder buf);
abstract void appendNamesParams(StringBuilder buf);
@Override
public String getInputQuery(Collection nsCol, long start,
long count) {
StringBuilder buf = new StringBuilder();
buf.append("xquery version \"1.0-ml\";\n");
buf.append("let $M := xdmp:with-namespaces((");
if (nsCol != null) {
for (Iterator nsIt = nsCol.iterator(); nsIt.hasNext();) {
String ns = nsIt.next();
buf.append('"').append(ns).append('"');
if (nsIt.hasNext()) {
buf.append(',');
}
}
}
buf.append("),");
// function name
appendFunctionName(buf);
buf.append("(");
// names
appendNamesParams(buf);
// options
buf.append("(\"skip=").append(start);
buf.append("\",\"truncate=").append(count).append("\"");
buf.append(",\"map\"");
String[] userOptions = getUserDefinedOptions();
if (userOptions != null) {
for (int i = 0; i < userOptions.length; i++) {
buf.append(",\"").append(userOptions[i]).append("\"");
}
}
buf.append("),\n");
// query
buf.append(getLexiconQuery()).append("))\n");
buf.append("for $k in map:keys($M)\n");
buf.append("let $v := map:get($M, $k)\n");
buf.append("for $each in $v\n");
buf.append("return ($k, $each)\n");
return buf.toString();
}
}