org.apache.flink.python.util.HashMapWrapper 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.flink.python.util;
import org.apache.flink.annotation.Internal;
import java.util.HashMap;
/**
* Helper class to create a {@link HashMap} taking Numeric data as key or value from Python side.
* This is to avoid unexpected boxing/unboxing happens, see https://github.com/py4j/py4j/issues/374
* for more details.
*/
@SuppressWarnings("rawtypes,unchecked")
@Internal
public class HashMapWrapper {
private final Class> keyCls;
private final Class> valueCls;
private final HashMap underlyingMap;
public HashMapWrapper(Class> keyCls, Class> valueCls) {
this.keyCls = keyCls;
this.valueCls = valueCls;
this.underlyingMap = new HashMap();
}
public void put(Object key, Object value) throws Exception {
final Object typedKey;
final Object typedValue;
if (keyCls != null) {
typedKey = convert(keyCls, key);
} else {
typedKey = key;
}
if (valueCls != null) {
typedValue = convert(valueCls, value);
} else {
typedValue = value;
}
underlyingMap.put(typedKey, typedValue);
}
public HashMap asMap() {
return underlyingMap;
}
private static Object convert(Class> cls, Object data) {
final Number typedData = (Number) data;
if (cls == Integer.class) {
return typedData.intValue();
} else if (cls == Long.class) {
return typedData.longValue();
} else if (cls == Float.class) {
return typedData.floatValue();
} else if (cls == Double.class) {
return typedData.doubleValue();
} else if (cls == Byte.class) {
return typedData.byteValue();
} else if (cls == Short.class) {
return typedData.shortValue();
} else {
throw new RuntimeException("Unexpected class type: " + cls);
}
}
}
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