UnionQueryExecutor (Carbonado 1.2.3 API)

java.lang.Object
+
- com.amazon.carbonado.qe.AbstractQueryExecutor<S>
- +
  - com.amazon.carbonado.qe.UnionQueryExecutor<S>
  +
+

+
+
All Implemented Interfaces:
+
QueryExecutor<S>
+
+
+
+
```
public class UnionQueryExecutor<S extends Storable>
+extends AbstractQueryExecutor<S>
```
+
QueryExecutor which wraps several others and unions the results.
+
Author:
+
Brian S O'Neill
+
See Also:
UnionCursor
+

+ +

Constructor Summary

+ + + + + + + + + + + + + + +

Constructors
Constructor and Description
`UnionQueryExecutor(java.util.List<QueryExecutor<S>> executors)`
`UnionQueryExecutor(java.util.List<QueryExecutor<S>> executors, + OrderingList<S> totalOrdering)`
`UnionQueryExecutor(QueryExecutor<S>... executors)`

+ +

+ + +

Method Summary

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

Methods
Modifier and Type	Method and Description
`Cursor<S>`	`fetch(FilterValues<S> values)` + Returns a new cursor using the given filter values. +
`Cursor<S>`	`fetch(FilterValues<S> values, + Query.Controller controller)` + Returns a new cursor using the given filter values. +
`Filter<S>`	`getFilter()` + Returns the combined filter of the wrapped executors. +
`OrderingList<S>`	`getOrdering()` + Returns the result ordering of this QueryExecutor. +
`boolean`	`printNative(java.lang.Appendable app, + int indentLevel, + FilterValues<S> values)` + Prints native queries of the wrapped executors. +
`boolean`	`printPlan(java.lang.Appendable app, + int indentLevel, + FilterValues<S> values)` + Prints the query plan to any appendable, if applicable. +

+ + +
Methods inherited from class com.amazon.carbonado.qe.AbstractQueryExecutor
+count, count, fetchSlice, fetchSlice, getStorableType, increaseIndent, indent, newline

+ + +
Methods inherited from class java.lang.Object
+clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

+ +
- + + +
  Constructor Detail
  + + + +
  - +
    UnionQueryExecutor
    +
```
public UnionQueryExecutor(QueryExecutor<S>... executors)
```
    +
    Parameters:
    executors - executors to wrap, each must have the exact same total ordering
    +
    Throws:
    +
    java.lang.IllegalArgumentException - if any parameter is null or if ordering doesn't match
    +
  + + + +
  - +
    UnionQueryExecutor
    +
```
public UnionQueryExecutor(java.util.List<QueryExecutor<S>> executors)
```
    +
    Parameters:
    executors - executors to wrap, each must have the exact same total ordering
    +
    Throws:
    +
    java.lang.IllegalArgumentException - if any executors is null or if ordering doesn't match
    +
  + + + +
  - +
    UnionQueryExecutor
    +
```
public UnionQueryExecutor(java.util.List<QueryExecutor<S>> executors,
+                  OrderingList<S> totalOrdering)
```
    +
    Parameters:
    executors - executors to wrap, each must have the exact same total ordering
    totalOrdering - effective total ordering of executors
    +
    Throws:
    +
    java.lang.IllegalArgumentException - if executors is null
    +
  +
+ +
- + + +
  Method Detail
  + + + +
  - +
    fetch
    +
```
public Cursor<S> fetch(FilterValues<S> values)
+                                 throws FetchException
```
    +
    Description copied from interface: QueryExecutor
    +
    Returns a new cursor using the given filter values.
    +
    Throws:
    +
    FetchException
    +
  + + + +
  - +
    fetch
    +
```
public Cursor<S> fetch(FilterValues<S> values,
+              Query.Controller controller)
+                                 throws FetchException
```
    +
    Description copied from interface: QueryExecutor
    +
    Returns a new cursor using the given filter values.
    +
    controller - optional controller which can abort query operation
    +
    Throws:
    +
    FetchException
    +
  + + + +
  - +
    getFilter
    +
```
public Filter<S> getFilter()
```
    +
    Returns the combined filter of the wrapped executors.
    +
    Returns:
    query filter, never null
    +
  + + + +
  - +
    getOrdering
    +
```
public OrderingList<S> getOrdering()
```
    +
    Description copied from interface: QueryExecutor
    +
    Returns the result ordering of this QueryExecutor.
    +
    Returns:
    query ordering in an unmodifiable list
    +
  + + + +
  - +
    printNative
    +
```
public boolean printNative(java.lang.Appendable app,
+                  int indentLevel,
+                  FilterValues<S> values)
+                    throws java.io.IOException
```
    +
    Prints native queries of the wrapped executors.
    +
    +
    Specified by:
    +
    printNative in interface QueryExecutor<S extends Storable>
    +
    Overrides:
    +
    printNative in class AbstractQueryExecutor<S extends Storable>
    +
    values - optional
    +
    Returns:
    false if not implemented
    +
    Throws:
    +
    java.io.IOException
    +
  + + + +
  - +
    printPlan
    +
```
public boolean printPlan(java.lang.Appendable app,
+                int indentLevel,
+                FilterValues<S> values)
+                  throws java.io.IOException
```
    +
    Description copied from interface: QueryExecutor
    +
    Prints the query plan to any appendable, if applicable.
    +
    values - optional
    +
    Returns:
    false if not implemented
    +
    Throws:
    +
    java.io.IOException
    +
  +
+

Class UnionQueryExecutor<S extends Storable>

Constructor Summary

Method Summary

Methods inherited from class com.amazon.carbonado.qe.AbstractQueryExecutor

Methods inherited from class java.lang.Object

Constructor Detail

UnionQueryExecutor

UnionQueryExecutor

UnionQueryExecutor

Method Detail

fetch

fetch

getFilter

getOrdering

printNative

printPlan