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org.apache.hadoop.hive.conf.VariableSubstitution Maven / Gradle / Ivy

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/**
 * 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.hadoop.hive.conf; import org.apache.hadoop.conf.Configuration; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.util.Map; public class VariableSubstitution extends SystemVariables { private static final Logger l4j = LoggerFactory.getLogger(VariableSubstitution.class); private final HiveVariableSource hiveVariableSource; public VariableSubstitution(HiveVariableSource hiveVariableSource) { this.hiveVariableSource = hiveVariableSource; } /** * The super method will handle with the case of substitutions for system variables, * hive conf variables and env variables. In this method, it will retrieve the hive * variables using hiveVariableSource. * * @param conf * @param var * @return */ @Override protected String getSubstitute(Configuration conf, String var) { String val = super.getSubstitute(conf, var); if (val == null && hiveVariableSource != null) { Map vars = hiveVariableSource.getHiveVariable(); if (var.startsWith(HIVEVAR_PREFIX)) { val = vars.get(var.substring(HIVEVAR_PREFIX.length())); } else { val = vars.get(var); } } return val; } public String substitute(HiveConf conf, String expr) { if (expr == null) { return expr; } if (HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVEVARIABLESUBSTITUTE)) { l4j.debug("Substitution is on: " + expr); } else { return expr; } int depth = HiveConf.getIntVar(conf, HiveConf.ConfVars.HIVEVARIABLESUBSTITUTEDEPTH); return substitute(conf, expr, depth); } }





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