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ColumnMetadata.java
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ColumnMetadata.java
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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.sysds.runtime.frame.data.columns;
import java.io.Serializable;
public class ColumnMetadata implements Serializable {
private static final long serialVersionUID = -90094082422100311L;
private static final long DEFAULT_DISTINCT = -1;
private long _ndistinct = DEFAULT_DISTINCT;
private String _mvValue = null;
/**
* Default constructor
*/
public ColumnMetadata() {
}
public ColumnMetadata(long ndistinct) {
_ndistinct = ndistinct;
}
public ColumnMetadata(long ndistinct, String mvval) {
_ndistinct = ndistinct <= 0 ? DEFAULT_DISTINCT: ndistinct;
_mvValue = mvval;
}
public ColumnMetadata(ColumnMetadata that) {
_ndistinct = that._ndistinct;
_mvValue = that._mvValue;
}
public long getNumDistinct() {
return _ndistinct;
}
public void setNumDistinct(long ndistinct) {
_ndistinct = ndistinct <= 0 ? DEFAULT_DISTINCT: ndistinct;
}
public String getMvValue() {
return _mvValue;
}
public void setMvValue(String mvVal) {
_mvValue = mvVal;
}
public boolean isDefault() {
return getMvValue() == null && getNumDistinct() == DEFAULT_DISTINCT;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(this.getClass().getSimpleName());
if(_ndistinct != DEFAULT_DISTINCT) {
sb.append(":");
sb.append(_ndistinct);
}
if(_mvValue != null)
sb.append("--" + _mvValue);
return sb.toString();
}
}