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org.apache.openjpa.jdbc.sql.MergedResult 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.openjpa.jdbc.sql;
import java.io.InputStream;
import java.io.Reader;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Array;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Ref;
import java.sql.SQLException;
import java.sql.Time;
import java.sql.Timestamp;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.time.OffsetTime;
import java.util.Calendar;
import java.util.Comparator;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import org.apache.openjpa.jdbc.kernel.JDBCFetchConfiguration;
import org.apache.openjpa.jdbc.kernel.JDBCStore;
import org.apache.openjpa.jdbc.meta.ClassMapping;
import org.apache.openjpa.jdbc.meta.FieldMapping;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.util.UnsupportedException;
/**
* Result that merges multiple result delegates. Support exists for
* maintaining ordering of the internally-held results, provided that each
* of the individual results is itself ordered.
*
* @author Abe White
*/
public class MergedResult implements Result {
private static final byte NEXT = 0;
private static final byte CURRENT = 1;
private static final byte DONE = 2;
private final Result[] _res;
private final byte[] _status;
private final ResultComparator _comp;
private final Object[] _order;
private int _idx = 0;
private boolean _pushedBack = false;
/**
* Constructor; supply delegates.
*/
public MergedResult(Result[] res) {
this(res, null);
}
/**
* Constructor; supply delegates and comparator for ordering results.
*/
public MergedResult(Result[] res, ResultComparator comp) {
_res = res;
_comp = comp;
_order = (comp == null) ? null : new Object[res.length];
_status = (comp == null) ? null : new byte[res.length];
}
@Override
public Object getEager(FieldMapping key) {
return _res[_idx].getEager(key);
}
@Override
public void putEager(FieldMapping key, Object res) {
_res[_idx].putEager(key, res);
}
@Override
public Joins newJoins() {
return _res[_idx].newJoins();
}
@Override
public void close() {
for (int i = 0; i < _res.length; i++)
_res[i].close();
}
@Override
public void setLocking(boolean locking) {
_res[_idx].setLocking(locking);
}
@Override
public boolean isLocking() {
return _res[_idx].isLocking();
}
@Override
public boolean supportsRandomAccess()
throws SQLException {
return false;
}
@Override
public boolean absolute(int row)
throws SQLException {
throw new UnsupportedException();
}
@Override
public boolean next()
throws SQLException {
if (_pushedBack) {
_pushedBack = false;
return true;
}
if (_comp == null) {
while (!_res[_idx].next()) {
if (_idx == _res.length - 1)
return false;
_idx++;
}
return true;
}
// ordering is involved; extract order values from each result
boolean hasValue = false;
for (int i = 0; i < _status.length; i++) {
switch (_status[i]) {
case NEXT:
if (_res[i].next()) {
hasValue = true;
_status[i] = CURRENT;
_order[i] = _comp.getOrderingValue(_res[i], i);
} else
_status[i] = DONE;
break;
case CURRENT:
hasValue = true;
break;
}
}
// all results exhausted
if (!hasValue)
return false;
// for all results with values, find the 'least' one according to
// the comparator
int least = -1;
Object orderVal = null;
for (int i = 0; i < _order.length; i++) {
if (_status[i] != CURRENT)
continue;
if (least == -1 || _comp.compare(_order[i], orderVal) < 0) {
least = i;
orderVal = _order[i];
}
}
// make the current result the one with the least value, and clear
// the cached value for that result
_idx = least;
_order[least] = null;
_status[least] = NEXT;
return true;
}
@Override
public void pushBack()
throws SQLException {
_pushedBack = true;
}
@Override
public int size()
throws SQLException {
int size = 0;
for (int i = 0; i < _res.length; i++)
size += _res[i].size();
return size;
}
@Override
public boolean contains(Object obj)
throws SQLException {
return _res[_idx].contains(obj);
}
@Override
public boolean containsAll(Object[] objs)
throws SQLException {
return _res[_idx].containsAll(objs);
}
@Override
public boolean contains(Column col, Joins joins)
throws SQLException {
return _res[_idx].contains(col, joins);
}
@Override
public boolean containsAll(Column[] cols, Joins joins)
throws SQLException {
return _res[_idx].containsAll(cols, joins);
}
@Override
public ClassMapping getBaseMapping() {
return _res[_idx].getBaseMapping();
}
@Override
public void setBaseMapping(ClassMapping mapping) {
_res[_idx].setBaseMapping(mapping);
}
@Override
public FieldMapping getMappedByFieldMapping() {
return _res[_idx].getMappedByFieldMapping();
}
@Override
public void setMappedByFieldMapping(FieldMapping fieldMapping) {
_res[_idx].setMappedByFieldMapping(fieldMapping);
}
@Override
public Object getMappedByValue() {
return _res[_idx].getMappedByValue();
}
@Override
public void setMappedByValue(Object mappedByValue) {
_res[_idx].setMappedByValue(mappedByValue);
}
@Override
public int indexOf() {
return _res[_idx].indexOf();
}
@Override
public Object load(ClassMapping mapping, JDBCStore store,
JDBCFetchConfiguration fetch)
throws SQLException {
return _res[_idx].load(mapping, store, fetch);
}
@Override
public Object load(ClassMapping mapping, JDBCStore store,
JDBCFetchConfiguration fetch, Joins joins)
throws SQLException {
return _res[_idx].load(mapping, store, fetch, joins);
}
@Override
public Array getArray(Object obj)
throws SQLException {
return _res[_idx].getArray(obj);
}
@Override
public InputStream getAsciiStream(Object obj)
throws SQLException {
return _res[_idx].getAsciiStream(obj);
}
@Override
public BigDecimal getBigDecimal(Object obj)
throws SQLException {
return _res[_idx].getBigDecimal(obj);
}
@Override
public BigInteger getBigInteger(Object obj)
throws SQLException {
return _res[_idx].getBigInteger(obj);
}
@Override
public InputStream getBinaryStream(Object obj)
throws SQLException {
return _res[_idx].getBinaryStream(obj);
}
@Override
public InputStream getLOBStream(JDBCStore store, Object obj)
throws SQLException {
return _res[_idx].getLOBStream(store, obj);
}
@Override
public Blob getBlob(Object obj)
throws SQLException {
return _res[_idx].getBlob(obj);
}
@Override
public boolean getBoolean(Object obj)
throws SQLException {
return _res[_idx].getBoolean(obj);
}
@Override
public byte getByte(Object obj)
throws SQLException {
return _res[_idx].getByte(obj);
}
@Override
public byte[] getBytes(Object obj)
throws SQLException {
return _res[_idx].getBytes(obj);
}
@Override
public Calendar getCalendar(Object obj)
throws SQLException {
return _res[_idx].getCalendar(obj);
}
@Override
public LocalDate getLocalDate(Object obj) throws SQLException {
return _res[_idx].getLocalDate(obj);
}
@Override
public LocalTime getLocalTime(Object obj) throws SQLException {
return _res[_idx].getLocalTime(obj);
}
@Override
public LocalDateTime getLocalDateTime(Object obj) throws SQLException {
return _res[_idx].getLocalDateTime(obj);
}
@Override
public OffsetTime getOffsetTime(Object obj) throws SQLException {
return _res[_idx].getOffsetTime(obj);
}
@Override
public OffsetDateTime getOffsetDateTime(Object obj) throws SQLException {
return _res[_idx].getOffsetDateTime(obj);
}
@Override
public char getChar(Object obj)
throws SQLException {
return _res[_idx].getChar(obj);
}
@Override
public Reader getCharacterStream(Object obj)
throws SQLException {
return _res[_idx].getCharacterStream(obj);
}
@Override
public Clob getClob(Object obj)
throws SQLException {
return _res[_idx].getClob(obj);
}
@Override
public Date getDate(Object obj)
throws SQLException {
return _res[_idx].getDate(obj);
}
@Override
public java.sql.Date getDate(Object obj, Calendar cal)
throws SQLException {
return _res[_idx].getDate(obj, cal);
}
@Override
public double getDouble(Object obj)
throws SQLException {
return _res[_idx].getDouble(obj);
}
@Override
public float getFloat(Object obj)
throws SQLException {
return _res[_idx].getFloat(obj);
}
@Override
public int getInt(Object obj)
throws SQLException {
return _res[_idx].getInt(obj);
}
@Override
public Locale getLocale(Object obj)
throws SQLException {
return _res[_idx].getLocale(obj);
}
@Override
public long getLong(Object obj)
throws SQLException {
return _res[_idx].getLong(obj);
}
@Override
public Number getNumber(Object obj)
throws SQLException {
return _res[_idx].getNumber(obj);
}
@Override
public Object getObject(Object obj, int metaType, Object arg)
throws SQLException {
return _res[_idx].getObject(obj, metaType, arg);
}
@Override
public Object getSQLObject(Object obj, Map map)
throws SQLException {
return _res[_idx].getSQLObject(obj, map);
}
@Override
public Ref getRef(Object obj, Map map)
throws SQLException {
return _res[_idx].getRef(obj, map);
}
@Override
public short getShort(Object obj)
throws SQLException {
return _res[_idx].getShort(obj);
}
@Override
public String getString(Object obj)
throws SQLException {
return _res[_idx].getString(obj);
}
@Override
public Time getTime(Object obj, Calendar cal)
throws SQLException {
return _res[_idx].getTime(obj, cal);
}
@Override
public Timestamp getTimestamp(Object obj, Calendar cal)
throws SQLException {
return _res[_idx].getTimestamp(obj, cal);
}
@Override
public Array getArray(Column col, Joins joins)
throws SQLException {
return _res[_idx].getArray(col, joins);
}
@Override
public InputStream getAsciiStream(Column col, Joins joins)
throws SQLException {
return _res[_idx].getAsciiStream(col, joins);
}
@Override
public BigDecimal getBigDecimal(Column col, Joins joins)
throws SQLException {
return _res[_idx].getBigDecimal(col, joins);
}
@Override
public BigInteger getBigInteger(Column col, Joins joins)
throws SQLException {
return _res[_idx].getBigInteger(col, joins);
}
@Override
public InputStream getBinaryStream(Column col, Joins joins)
throws SQLException {
return _res[_idx].getBinaryStream(col, joins);
}
@Override
public Blob getBlob(Column col, Joins joins)
throws SQLException {
return _res[_idx].getBlob(col, joins);
}
@Override
public boolean getBoolean(Column col, Joins joins)
throws SQLException {
return _res[_idx].getBoolean(col, joins);
}
@Override
public byte getByte(Column col, Joins joins)
throws SQLException {
return _res[_idx].getByte(col, joins);
}
@Override
public byte[] getBytes(Column col, Joins joins)
throws SQLException {
return _res[_idx].getBytes(col, joins);
}
@Override
public Calendar getCalendar(Column col, Joins joins)
throws SQLException {
return _res[_idx].getCalendar(col, joins);
}
@Override
public char getChar(Column col, Joins joins)
throws SQLException {
return _res[_idx].getChar(col, joins);
}
@Override
public Reader getCharacterStream(Column col, Joins joins)
throws SQLException {
return _res[_idx].getCharacterStream(col, joins);
}
@Override
public Clob getClob(Column col, Joins joins)
throws SQLException {
return _res[_idx].getClob(col, joins);
}
@Override
public Date getDate(Column col, Joins joins)
throws SQLException {
return _res[_idx].getDate(col, joins);
}
@Override
public java.sql.Date getDate(Column col, Calendar cal, Joins joins)
throws SQLException {
return _res[_idx].getDate(col, cal, joins);
}
@Override
public double getDouble(Column col, Joins joins)
throws SQLException {
return _res[_idx].getDouble(col, joins);
}
@Override
public float getFloat(Column col, Joins joins)
throws SQLException {
return _res[_idx].getFloat(col, joins);
}
@Override
public int getInt(Column col, Joins joins)
throws SQLException {
return _res[_idx].getInt(col, joins);
}
@Override
public Locale getLocale(Column col, Joins joins)
throws SQLException {
return _res[_idx].getLocale(col, joins);
}
@Override
public long getLong(Column col, Joins joins)
throws SQLException {
return _res[_idx].getLong(col, joins);
}
@Override
public Number getNumber(Column col, Joins joins)
throws SQLException {
return _res[_idx].getNumber(col, joins);
}
@Override
public Object getObject(Column col, Object arg, Joins joins)
throws SQLException {
return _res[_idx].getObject(col, arg, joins);
}
@Override
public Object getSQLObject(Column col, Map map, Joins joins)
throws SQLException {
return _res[_idx].getSQLObject(col, map, joins);
}
@Override
public Ref getRef(Column col, Map map, Joins joins)
throws SQLException {
return _res[_idx].getRef(col, map, joins);
}
@Override
public short getShort(Column col, Joins joins)
throws SQLException {
return _res[_idx].getShort(col, joins);
}
@Override
public String getString(Column col, Joins joins)
throws SQLException {
return _res[_idx].getString(col, joins);
}
@Override
public Time getTime(Column col, Calendar cal, Joins joins)
throws SQLException {
return _res[_idx].getTime(col, cal, joins);
}
@Override
public Timestamp getTimestamp(Column col, Calendar cal, Joins joins)
throws SQLException {
return _res[_idx].getTimestamp(col, cal, joins);
}
@Override
public boolean wasNull()
throws SQLException {
return _res[_idx].wasNull();
}
@Override
public void startDataRequest(Object mapping) {
for (int i = 0; i < _res.length; i++)
_res[i].startDataRequest(mapping);
}
@Override
public void endDataRequest() {
for (int i = 0; i < _res.length; i++)
_res[i].endDataRequest();
}
/**
* Comparator for ordering result rows.
*/
public interface ResultComparator
extends Comparator {
/**
* Return the ordering value of the current row of the given result.
*/
Object getOrderingValue(Result res, int idx);
}
}
