82 lines
2.1 KiB
Java
82 lines
2.1 KiB
Java
/**
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*
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*/
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package org.gcube.accounting.datamodel;
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import java.io.Serializable;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.util.HashSet;
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import java.util.Set;
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import org.gcube.accounting.exception.NotAggregatableRecordsExceptions;
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/**
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* @author Luca Frosini (ISTI - CNR) http://www.lucafrosini.com/
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*
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*/
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public abstract class AggregationStrategy<T extends AggregatedUsageRecord<T, B>, B extends SingleUsageRecord> {
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protected T t;
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protected Set<String> aggregationField;
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public AggregationStrategy(T t){
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this.t = t;
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this.aggregationField = new HashSet<String>();
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this.aggregationField.add(BasicUsageRecord.USAGE_RECORD_TYPE);
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this.aggregationField.add(BasicUsageRecord.SCOPE);
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}
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protected String commonFieldHash(B record) {
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try {
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MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
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String concatenation = "";
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for(String field : aggregationField){
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concatenation = concatenation + record.getResourceProperty(field).toString();
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}
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messageDigest.update(concatenation.getBytes());
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return new String(messageDigest.digest());
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}catch(NoSuchAlgorithmException e){
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throw new UnsupportedOperationException(e.getCause());
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}
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}
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protected boolean isAggregable(UsageRecord record) {
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for(String field : aggregationField){
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Serializable recordValue = record.getResourceProperty(field);
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Serializable thisValue = t.getResourceProperty(field);
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// TODO Check THIS
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if(!recordValue.equals(thisValue)){
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return false;
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}
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}
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return true;
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}
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protected abstract T reallyAggregate(T t) throws NotAggregatableRecordsExceptions;
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public T aggregate(B record) throws NotAggregatableRecordsExceptions {
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try{
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if(isAggregable(record)){
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throw new NotAggregatableRecordsExceptions("The Record provided as argument has different values for field wich must be common to be aggragatable");
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}
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t.getAggregatedUsageRecord(record);
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t = reallyAggregate(t);
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return t;
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}catch(NotAggregatableRecordsExceptions e){
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throw e;
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}catch(Exception ex){
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throw new NotAggregatableRecordsExceptions(ex.getCause());
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}
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}
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}
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