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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.lens.driver.es.grammar;
import java.util.List;
import org.apache.lens.driver.es.ESDriverConfig;
import org.apache.lens.driver.es.exceptions.InvalidQueryException;
import org.apache.commons.lang.Validate;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.google.common.collect.ImmutableMap;
public enum Predicates {
term {
@Override
public void build(ObjectNode targetNode, String leftCol, List rightExps) {
final ObjectNode termNode = JSON_NODE_FACTORY.objectNode();
termNode.put(leftCol, removeSingleQuotesFromLiteral(rightExps.get(0)));
targetNode.put(ESDriverConfig.TERM, termNode);
}
},
not_term {
@Override
public void build(ObjectNode targetNode, String leftCol, List rightExps) {
final ObjectNode innerNode = addNotNode(targetNode);
term.build(innerNode, leftCol, rightExps);
}
},
terms {
@Override
public void build(ObjectNode targetNode, String leftCol, List rightExps) {
final ObjectNode termsNode = JSON_NODE_FACTORY.objectNode();
final ArrayNode arrayNode = JSON_NODE_FACTORY.arrayNode();
for (String right : rightExps) {
arrayNode.add(removeSingleQuotesFromLiteral(right));
}
termsNode.put(leftCol, arrayNode);
targetNode.put(ESDriverConfig.TERMS, termsNode);
}
},
not_terms {
@Override
public void build(ObjectNode targetNode, String leftCol, List rightExps) {
final ObjectNode innerNode = addNotNode(targetNode);
terms.build(innerNode, leftCol, rightExps);
}
},
gt {
@Override
public void build(ObjectNode targetNode, String leftCol, List rightExps) {
final ObjectNode rangeInnerNode = getRangeNode(targetNode, leftCol, rightExps);
rangeInnerNode.put("gt", removeSingleQuotesFromLiteral(rightExps.get(0)));
}
},
gte {
@Override
public void build(ObjectNode targetNode, String leftCol, List rightExps) {
final ObjectNode rangeInnerNode = getRangeNode(targetNode, leftCol, rightExps);
rangeInnerNode.put("gte", removeSingleQuotesFromLiteral(rightExps.get(0)));
}
},
lt {
@Override
public void build(ObjectNode targetNode, String leftCol, List rightExps) {
final ObjectNode rangeInnerNode = getRangeNode(targetNode, leftCol, rightExps);
rangeInnerNode.put("lt", removeSingleQuotesFromLiteral(rightExps.get(0)));
}
},
lte {
@Override
public void build(ObjectNode targetNode, String leftCol, List rightExps) {
final ObjectNode rangeInnerNode = getRangeNode(targetNode, leftCol, rightExps);
rangeInnerNode.put("lte", removeSingleQuotesFromLiteral(rightExps.get(0)));
}
},
range {
@Override
public void build(ObjectNode targetNode, String leftCol, List rightExps) {
Validate.isTrue(rightExps.size() == 2);
final ObjectNode rangeInnerNode = getRangeNode(targetNode, leftCol, rightExps);
rangeInnerNode.put("gt", removeSingleQuotesFromLiteral(rightExps.get(0)));
rangeInnerNode.put("lt", removeSingleQuotesFromLiteral(rightExps.get(1)));
}
};
private static ObjectNode getRangeNode(ObjectNode targetNode, String leftCol, List rightExps) {
final ObjectNode rangeNode = JSON_NODE_FACTORY.objectNode();
final ObjectNode rangeInnerNode = JSON_NODE_FACTORY.objectNode();
rangeNode.put(leftCol, rangeInnerNode);
targetNode.put(ESDriverConfig.RANGE, rangeNode);
return rangeInnerNode;
}
protected static final JsonNodeFactory JSON_NODE_FACTORY = JsonNodeFactory.instance;
private static String removeSingleQuotesFromLiteral(String rightExp) {
return rightExp.replaceAll("^\'|\'$", "");
}
protected final ObjectNode addNotNode(ObjectNode targetNode) {
final ObjectNode innerPredicateNode = JSON_NODE_FACTORY.objectNode();
targetNode.put("not", innerPredicateNode);
return innerPredicateNode;
}
public abstract void build(ObjectNode targetNode, String leftCol, List rightExps);
public static Predicates getFor(String hqlPredicate) throws InvalidQueryException {
if (HQL_PREDICATE_MAP.containsKey(hqlPredicate)) {
return HQL_PREDICATE_MAP.get(hqlPredicate);
}
throw new InvalidQueryException("Cannot find a handler for the hql predicate " + hqlPredicate);
}
private static final ImmutableMap HQL_PREDICATE_MAP;
static {
final ImmutableMap.Builder predicatesBuilder = ImmutableMap.builder();
predicatesBuilder.put(">", gt);
predicatesBuilder.put(">=", gte);
predicatesBuilder.put("<", lt);
predicatesBuilder.put("<=", lte);
predicatesBuilder.put("between", range);
predicatesBuilder.put("=", term);
predicatesBuilder.put("!=", not_term);
predicatesBuilder.put("in", terms);
predicatesBuilder.put("not in", not_terms);
HQL_PREDICATE_MAP = predicatesBuilder.build();
}
}
