Example usage for org.apache.commons.collections.iterators SingletonIterator SingletonIterator

Introduction

In this page you can find the example usage for org.apache.commons.collections.iterators SingletonIterator SingletonIterator.

Prototype

public SingletonIterator(Object object) 

Source Link

Document

Constructs a new SingletonIterator where remove is a permitted operation.

Usage

From source file:com.splicemachine.derby.stream.output.direct.DirectDataSetWriter.java

@Override
public DataSet<LocatedRow> write() throws StandardException {
    try {/*from  w  w w  .  j a  v  a  2 s .  c om*/
        pipelineWriter.open();
        CountingIterator rows = new CountingIterator(dataSet.values().toLocalIterator());
        pipelineWriter.write(rows);
        pipelineWriter.close(); //make sure everything gets written

        ValueRow valueRow = new ValueRow(1);
        valueRow.setColumn(1, new SQLLongint(rows.count));
        return new ControlDataSet<>(new SingletonIterator(new LocatedRow(valueRow)));
    } catch (Exception e) {
        throw Exceptions.parseException(e);
    }
}

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From source file:com.splicemachine.derby.stream.iterator.GetNLJoinOneRowIterator.java

@Override
public Pair<OperationContext, Iterator<LocatedRow>> call() throws Exception {
    JoinOperation op = (JoinOperation) this.operationContext.getOperation();
    op.getLeftOperation().setCurrentLocatedRow(this.locatedRow);
    SpliceOperation rightOperation = op.getRightOperation();

    rightOperation.openCore(EngineDriver.driver().processorFactory().localProcessor(op.getActivation(), op));
    Iterator<LocatedRow> rightSideNLJIterator = rightOperation.getLocatedRowIterator();
    // Lets make sure we perform a call...
    boolean hasNext = rightSideNLJIterator.hasNext();
    if (hasNext) {
        // For left outer join, if there is no match, return an empty row from right side
        LocatedRow lr = rightSideNLJIterator.next();
        StreamLogUtils.logOperationRecordWithMessage(lr, operationContext, "outer - right side no rows");
        op.setCurrentLocatedRow(lr);//w w w  .  java2s . c  o  m
        rightSideNLJIterator = new SingletonIterator(lr);
    }

    return new Pair<>(operationContext, rightSideNLJIterator);
}

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From source file:com.splicemachine.derby.stream.function.InnerJoinRestrictionFlatMapFunction.java

@Override
public Iterator<LocatedRow> call(Tuple2<LocatedRow, Iterable<LocatedRow>> tuple) throws Exception {
    checkInit();/*from  w w  w  .j a  v a  2  s .  com*/
    leftRow = tuple._1();
    Iterator<LocatedRow> it = tuple._2.iterator();
    while (it.hasNext()) {
        rightRow = it.next();
        mergedRow = JoinUtils.getMergedRow(leftRow.getRow(), rightRow.getRow(), op.wasRightOuterJoin,
                executionFactory.getValueRow(numberOfColumns));
        op.setCurrentRow(mergedRow);
        if (op.getRestriction().apply(mergedRow)) { // Has Row, abandon
            LocatedRow lr = new LocatedRow(rightRow.getRowLocation(), mergedRow);
            op.setCurrentLocatedRow(lr);
            return new SingletonIterator(lr);
        }
        operationContext.recordFilter();
    }
    return Collections.EMPTY_LIST.iterator();
}

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From source file:com.splicemachine.derby.stream.iterator.GetNLJoinLeftOuterIterator.java

@Override
public Pair<OperationContext, Iterator<LocatedRow>> call() throws Exception {
    JoinOperation op = (JoinOperation) this.operationContext.getOperation();
    op.getLeftOperation().setCurrentLocatedRow(this.locatedRow);
    SpliceOperation rightOperation = op.getRightOperation();

    rightOperation.openCore(EngineDriver.driver().processorFactory().localProcessor(op.getActivation(), op));
    Iterator<LocatedRow> rightSideNLJIterator = rightOperation.getLocatedRowIterator();
    // Lets make sure we perform a call...
    boolean hasNext = rightSideNLJIterator.hasNext();
    if (!hasNext) {
        // For left outer join, if there is no match, return an empty row from right side
        LocatedRow lr = new LocatedRow(locatedRow.getRowLocation(), op.getEmptyRow());
        StreamLogUtils.logOperationRecordWithMessage(lr, operationContext, "outer - right side no rows");
        op.setCurrentLocatedRow(lr);//  w  w w . j a  va 2  s. c  om
        rightSideNLJIterator = new SingletonIterator(lr);
    }

    return new Pair<>(operationContext, rightSideNLJIterator);
}

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From source file:com.splicemachine.derby.stream.iterator.GetNLJoinAntiIterator.java

@Override
public Pair<OperationContext, Iterator<LocatedRow>> call() throws Exception {
    JoinOperation op = (JoinOperation) this.operationContext.getOperation();
    op.getLeftOperation().setCurrentLocatedRow(this.locatedRow);
    SpliceOperation rightOperation = op.getRightOperation();

    rightOperation.openCore(EngineDriver.driver().processorFactory().localProcessor(op.getActivation(), op));
    Iterator<LocatedRow> rightSideNLJIterator = rightOperation.getLocatedRowIterator();
    // Lets make sure we perform a call...
    boolean hasNext = rightSideNLJIterator.hasNext();

    if (!hasNext) {
        // For anti join, if there is no match on the right side, return an empty row
        LocatedRow lr = new LocatedRow(locatedRow.getRowLocation(), op.getEmptyRow());
        StreamLogUtils.logOperationRecordWithMessage(lr, operationContext, "outer - right side no rows");
        op.setCurrentLocatedRow(lr);//www  .j  av a  2  s .c o m
        rightSideNLJIterator = new SingletonIterator(lr);
    } else {
        rightSideNLJIterator = Collections.<LocatedRow>emptyList().iterator();
    }

    return new Pair<>(operationContext, rightSideNLJIterator);
}

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From source file:com.splicemachine.derby.stream.function.MergeAllAggregatesFlatMapFunction.java

@SuppressWarnings("unchecked")
@Override//from w  w  w .  ja va  2  s.  c om
public Iterator<LocatedRow> call(Iterator<LocatedRow> locatedRows) throws Exception {
    if (!locatedRows.hasNext()) {
        return returnDefault ? new SingletonIterator(new LocatedRow(getOperation().getExecRowDefinition()))
                : Collections.EMPTY_LIST.iterator();
    }
    if (!initialized) {
        op = (GenericAggregateOperation) getOperation();
        aggregates = op.aggregates;
        initialized = true;
    }
    ExecRow r1 = locatedRows.next().getRow();
    for (SpliceGenericAggregator aggregator : aggregates) {
        if (!aggregator.isInitialized(r1)) {
            //                if (RDDUtils.LOG.isTraceEnabled()) {
            //                    RDDUtils.LOG.trace(String.format("Initializing and accumulating %s", r1));
            //                }
            aggregator.initializeAndAccumulateIfNeeded(r1, r1);
        }
    }
    while (locatedRows.hasNext()) {
        ExecRow r2 = locatedRows.next().getRow();
        for (SpliceGenericAggregator aggregator : aggregates) {
            if (!aggregator.isInitialized(r2)) {
                //                    if (RDDUtils.LOG.isTraceEnabled()) {
                //                        RDDUtils.LOG.trace(String.format("Accumulating %s to %s", r2, r1));
                //                    }
                aggregator.accumulate(r2, r1);
            } else {
                //                    if (RDDUtils.LOG.isTraceEnabled()) {
                //                        RDDUtils.LOG.trace(String.format("Merging %s to %s", r2, r1));
                //                    }
                aggregator.merge(r2, r1);
            }
        }
    }
    op.finishAggregation(r1); // calls setCurrentRow
    return new SingletonIterator(new LocatedRow(r1));
}

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From source file:com.splicemachine.derby.stream.function.AntiJoinRestrictionFlatMapFunction.java

@Override
public Iterator<LocatedRow> call(Tuple2<LocatedRow, Iterable<LocatedRow>> tuple) throws Exception {
    checkInit();/*from   w ww .ja v a  2  s.c  o m*/
    leftRow = tuple._1();
    Iterator<LocatedRow> it = tuple._2.iterator();
    while (it.hasNext()) {
        rightRow = it.next();
        mergedRow = JoinUtils.getMergedRow(leftRow.getRow(), rightRow.getRow(), op.wasRightOuterJoin,
                executionFactory.getValueRow(numberOfColumns));
        op.setCurrentRow(mergedRow);
        if (op.getRestriction().apply(mergedRow)) { // Has Row, abandon
            operationContext.recordFilter();
            return Collections.<LocatedRow>emptyList().iterator();
        }
    }
    // No Rows Matched...
    LocatedRow returnRow = new LocatedRow(leftRow.getRowLocation(), JoinUtils.getMergedRow(leftRow.getRow(),
            op.getEmptyRow(), op.wasRightOuterJoin, executionFactory.getValueRow(numberOfColumns)));
    op.setCurrentLocatedRow(returnRow);
    return new SingletonIterator(returnRow);
}

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From source file:com.splicemachine.derby.stream.function.NormalizeFunction.java

@Override
public Iterator<LocatedRow> call(LocatedRow sourceRow) throws Exception {

    NormalizeOperation normalize = operationContext.getOperation();
    normalize.source.setCurrentLocatedRow(sourceRow);
    if (sourceRow != null) {
        ExecRow normalized = null;/*from w w  w  .j av a 2s  . c o m*/
        try {
            normalized = normalize.normalizeRow(sourceRow.getRow(), true);
        } catch (StandardException e) {
            if (operationContext != null && operationContext.isPermissive()) {
                operationContext.recordBadRecord(e.getLocalizedMessage() + sourceRow.toString(), e);
                return Collections.<LocatedRow>emptyList().iterator();
            }
            throw e;
        }
        getActivation().setCurrentRow(normalized, normalize.getResultSetNumber());
        return new SingletonIterator(new LocatedRow(sourceRow.getRowLocation(), normalized.getClone()));
    } else
        return Collections.<LocatedRow>emptyList().iterator();
}

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From source file:com.jaspersoft.jasperserver.api.metadata.security.BasicMethodCollectionArgumentVoter.java

protected Iterator getObjectsIterator(Object secureObject) {
    Iterator<?> iterator;//from  w w  w  .ja va2s .  co m
    if (secureObject instanceof Collection) {
        iterator = ((Collection) secureObject).iterator();
    } else if (secureObject != null && secureObject.getClass().isArray()) {
        iterator = new ArrayIterator(secureObject);
    } else {
        iterator = new SingletonIterator(secureObject);
    }
    return iterator;
}

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From source file:com.splicemachine.derby.stream.function.ProjectRestrictFlatMapFunction.java

@Override
public Iterator<LocatedRow> call(LocatedRow from) throws Exception {
    if (!initialized) {
        initialized = true;/*w  w  w  .jav  a2  s  .com*/
        op = (ProjectRestrictOperation) getOperation();
        executionFactory = op.getExecutionFactory();
    }
    op.setCurrentRow(from.getRow());
    op.source.setCurrentRow(from.getRow());
    if (!op.getRestriction().apply(from.getRow())) {
        operationContext.recordFilter();
        return Collections.<LocatedRow>emptyList().iterator();
    }
    ExecRow preCopy = op.doProjection(from.getRow());
    LocatedRow locatedRow = new LocatedRow(from.getRowLocation(), preCopy);
    op.setCurrentLocatedRow(locatedRow);
    return new SingletonIterator(locatedRow);
}

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