org.apache.parquet.pig.summary.SummaryData 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 org.apache.parquet.pig.summary;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import org.apache.pig.impl.logicalLayer.schema.Schema.FieldSchema;
/**
* Base class for a node of the data summary tree
*/
@JsonInclude(JsonInclude.Include.NON_NULL)
public abstract class SummaryData {
private static ObjectMapper objectMapper = new ObjectMapper();
private static ObjectMapper prettyObjectMapper = new ObjectMapper();
static {
prettyObjectMapper.enable(SerializationFeature.INDENT_OUTPUT);
}
private long count;
public static String toJSON(SummaryData summaryData) {
return toJSON(summaryData, objectMapper);
}
public static String toPrettyJSON(SummaryData summaryData) {
return toJSON(summaryData, prettyObjectMapper);
}
private static String toJSON(SummaryData summaryData, ObjectMapper mapper) {
StringWriter stringWriter = new StringWriter();
try {
mapper.writeValue(stringWriter, summaryData);
} catch (JsonGenerationException e) {
throw new RuntimeException(e);
} catch (JsonMappingException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
}
return stringWriter.toString();
}
public static T fromJSON(String json, Class clazz) {
try {
return objectMapper.readValue(new StringReader(json), clazz);
} catch (JsonParseException e) {
throw new RuntimeException(e);
} catch (JsonMappingException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public static T merge(T s1, T s2) {
if (s1 == null) {
return s2;
} else if (s2 == null) {
return s1;
} else {
s1.merge(s2);
return s1;
}
}
protected FieldSchema getField(Schema schema, int i) {
try {
if (schema == null || i >= schema.size()) {
return null;
}
FieldSchema field = schema.getField(i);
return field;
} catch (FrontendException e) {
throw new RuntimeException(e);
}
}
protected Schema getSchema(FieldSchema field) {
return field == null ? null : field.schema;
}
protected String getName(FieldSchema field) {
return field == null ? null : field.alias;
}
/**
* add a single element to the structure
* @param o never null
*/
public void add(Object o) {
++count;
}
/**
* merge the given input into this one
* @param other never null
*/
public void merge(SummaryData other) {
this.count += other.count;
}
public long getCount() {
return count;
}
public void setCount(long count) {
this.count = count;
}
@Override
public String toString() {
return toJSON(this);
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy