com.datatorrent.lib.streamquery.condition.EqualValueCondition Maven / Gradle / Ivy
/**
* 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 com.datatorrent.lib.streamquery.condition;
import java.util.HashMap;
import java.util.Map;
/**
* An implementation of condition on column equality.
*
* A valid row must have all key/value map in column name/value map.
*
* Properties :
* equalMap : Column equal value map store.
* @displayName Equal Value Condition
* @category Stream Manipulators
* @tags sql condition
* @since 0.3.4
*/
public class EqualValueCondition extends Condition
{
/**
* Equal column map.
*/
private HashMap equalMap = new HashMap();
/**
* Add column equal condition.
*/
public void addEqualValue(String column, Object value)
{
equalMap.put(column, value);
}
/**
* Check valid row.
*/
@Override
public boolean isValidRow(Map row)
{
// no conditions
if (equalMap.size() == 0) {
return true;
}
// compare each condition value
for (Map.Entry entry : equalMap.entrySet()) {
if (!row.containsKey(entry.getKey())) {
return false;
}
Object value = row.get(entry.getKey());
if (entry.getValue() == null) {
if (value == null) {
return true;
}
return false;
}
if (value == null) {
return false;
}
if (!entry.getValue().equals(value)) {
return false;
}
}
return true;
}
/**
* check valid join, not implemented
*
* @return false
*/
@Override
public boolean isValidJoin(Map row1, Map row2)
{
return false;
}
}