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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.openjpa.kernel;
import java.io.Serializable;
import java.security.AccessController;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import org.apache.commons.collections.map.LinkedMap;
import org.apache.commons.lang.ObjectUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.openjpa.conf.OpenJPAConfiguration;
import org.apache.openjpa.enhance.PersistenceCapable;
import org.apache.openjpa.kernel.exps.AggregateListener;
import org.apache.openjpa.kernel.exps.FilterListener;
import org.apache.openjpa.kernel.exps.Constant;
import org.apache.openjpa.kernel.exps.Literal;
import org.apache.openjpa.kernel.exps.Path;
import org.apache.openjpa.kernel.exps.Val;
import org.apache.openjpa.lib.log.Log;
import org.apache.openjpa.lib.rop.EagerResultList;
import org.apache.openjpa.lib.rop.MergedResultObjectProvider;
import org.apache.openjpa.lib.rop.RangeResultObjectProvider;
import org.apache.openjpa.lib.rop.ResultList;
import org.apache.openjpa.lib.rop.ResultObjectProvider;
import org.apache.openjpa.lib.util.J2DoPrivHelper;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.lib.util.ReferenceHashSet;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.openjpa.meta.ClassMetaData;
import org.apache.openjpa.meta.FieldMetaData;
import org.apache.openjpa.meta.JavaTypes;
import org.apache.openjpa.meta.MetaDataRepository;
import org.apache.openjpa.util.GeneralException;
import org.apache.openjpa.util.InvalidStateException;
import org.apache.openjpa.util.NonUniqueResultException;
import org.apache.openjpa.util.NoResultException;
import org.apache.openjpa.util.OpenJPAException;
import org.apache.openjpa.util.UnsupportedException;
import org.apache.openjpa.util.UserException;
import org.apache.openjpa.util.ImplHelper;
import serp.util.Numbers;
import serp.util.Strings;
/**
* Implementation of the {@link Query} interface.
*
* @author Abe White
* @nojavadoc
*/
public class QueryImpl
implements Query {
private static final Localizer _loc = Localizer.forPackage(QueryImpl.class);
private final String _language;
private final StoreQuery _storeQuery;
private transient final BrokerImpl _broker;
private transient final Log _log;
private transient ClassLoader _loader = null;
// query has its own internal lock
private final ReentrantLock _lock;
// unparsed state
private Class _class = null;
private boolean _subclasses = true;
private boolean _readOnly = false;
private String _query = null;
private String _params = null;
// parsed state
private transient Compilation _compiled = null;
private transient boolean _compiling = false;
private transient ResultPacker _packer = null;
// candidates
private transient Collection _collection = null;
private transient Extent _extent = null;
// listeners
private Map _filtListeners = null;
private Map _aggListeners = null;
// configuration for loading objects
private FetchConfiguration _fc = null;
private boolean _ignoreChanges = false;
private Class _resultMappingScope = null;
private String _resultMappingName = null;
// these fields should only be used directly after we have a compilation,
// because their values may be encoded in the query string
private Boolean _unique = null;
private Class _resultClass = null;
private transient long _startIdx = 0;
private transient long _endIdx = Long.MAX_VALUE;
private transient boolean _rangeSet = false;
// remember the list of all the results we have returned so we
// can free their resources when close or closeAll is called
private transient final Collection _resultLists = new ReferenceHashSet
(ReferenceHashSet.WEAK);
/**
* Construct a query managed by the given broker.
*/
public QueryImpl(Broker broker, String language, StoreQuery storeQuery) {
_broker = (BrokerImpl) broker;
_language = language;
_storeQuery = storeQuery;
_fc = (FetchConfiguration) broker.getFetchConfiguration().clone();
_log = broker.getConfiguration().getLog(OpenJPAConfiguration.LOG_QUERY);
_storeQuery.setContext(this);
if (_broker != null && _broker.getMultithreaded())
_lock = new ReentrantLock();
else
_lock = null;
}
/**
* Internal store query.
*/
public StoreQuery getStoreQuery() {
return _storeQuery;
}
public Broker getBroker() {
return _broker;
}
public Query getQuery() {
return this;
}
public StoreContext getStoreContext() {
return _broker;
}
public String getLanguage() {
return _language;
}
public FetchConfiguration getFetchConfiguration() {
return _fc;
}
public String getQueryString() {
return _query;
}
public boolean getIgnoreChanges() {
assertOpen();
return _ignoreChanges;
}
public void setIgnoreChanges(boolean flag) {
lock();
try {
assertOpen();
// allowed modification: no read-only check
_ignoreChanges = flag;
} finally {
unlock();
}
}
public boolean isReadOnly() {
assertOpen();
return _readOnly;
}
public void setReadOnly(boolean flag) {
lock();
try {
assertOpen();
_readOnly = flag;
} finally {
unlock();
}
}
public void addFilterListener(FilterListener listener) {
lock();
try {
assertOpen();
assertNotReadOnly();
if (_filtListeners == null)
_filtListeners = new HashMap(5);
_filtListeners.put(listener.getTag(), listener);
} finally {
unlock();
}
}
public void removeFilterListener(FilterListener listener) {
lock();
try {
assertOpen();
assertNotReadOnly();
if (_filtListeners != null)
_filtListeners.remove(listener.getTag());
} finally {
unlock();
}
}
public Collection getFilterListeners() {
return (_filtListeners == null) ? Collections.EMPTY_LIST
: _filtListeners.values();
}
public FilterListener getFilterListener(String tag) {
// first check listeners for this query
if (_filtListeners != null) {
FilterListener listen = (FilterListener) _filtListeners.get(tag);
if (listen != null)
return listen;
}
// check user-defined listeners from configuration
FilterListener[] confListeners = _broker.getConfiguration().
getFilterListenerInstances();
for (int i = 0; i < confListeners.length; i++)
if (confListeners[i].getTag().equals(tag))
return confListeners[i];
// check store listeners
return _storeQuery.getFilterListener(tag);
}
public void addAggregateListener(AggregateListener listener) {
lock();
try {
assertOpen();
assertNotReadOnly();
if (_aggListeners == null)
_aggListeners = new HashMap(5);
_aggListeners.put(listener.getTag(), listener);
} finally {
unlock();
}
}
public void removeAggregateListener(AggregateListener listener) {
lock();
try {
assertOpen();
assertNotReadOnly();
if (_aggListeners != null)
_aggListeners.remove(listener.getTag());
} finally {
unlock();
}
}
public Collection getAggregateListeners() {
return (_aggListeners == null) ? Collections.EMPTY_LIST
: _aggListeners.values();
}
public AggregateListener getAggregateListener(String tag) {
// first check listeners for this query
if (_aggListeners != null) {
AggregateListener listen = (AggregateListener) _aggListeners.
get(tag);
if (listen != null)
return listen;
}
// check user-defined listeners from configuration
AggregateListener[] confListeners = _broker.getConfiguration().
getAggregateListenerInstances();
for (int i = 0; i < confListeners.length; i++)
if (confListeners[i].getTag().equals(tag))
return confListeners[i];
// check store listeners
return _storeQuery.getAggregateListener(tag);
}
public Extent getCandidateExtent() {
// if just the class is set, fetch the corresponding extent; if the
// extent is already set but its ignore cache setting is wrong,
// get a new extent with the correct setting (don't modify orig extent
// in case the user has a reference to it and might use it)
lock();
try {
Class cls = getCandidateType();
if (_extent == null && _collection == null && _broker != null
&& cls != null) {
_extent = _broker.newExtent(cls, _subclasses);
_extent.setIgnoreChanges(_ignoreChanges);
} else if (_extent != null
&& _extent.getIgnoreChanges() != _ignoreChanges && cls != null){
_extent = _broker.newExtent(cls, _extent.hasSubclasses());
_extent.setIgnoreChanges(_ignoreChanges);
}
return _extent;
} finally {
unlock();
}
}
public void setCandidateExtent(Extent candidateExtent) {
lock();
try {
assertOpen();
assertNotReadOnly();
if (candidateExtent == _extent)
return;
if (candidateExtent == null) {
_extent = null;
return;
}
// if extent then not collection
_extent = candidateExtent;
_collection = null;
boolean invalidate = false;
if (_extent.getElementType() != _class) {
_class = _extent.getElementType();
_loader = null;
invalidate = true;
}
if (_extent.hasSubclasses() != _subclasses) {
_subclasses = _extent.hasSubclasses();
invalidate = true;
}
if (invalidate)
invalidateCompilation();
} finally {
unlock();
}
}
public Collection getCandidateCollection() {
assertOpen();
return _collection;
}
public void setCandidateCollection(Collection candidateCollection) {
if (!_storeQuery.supportsInMemoryExecution())
throw new UnsupportedException(_loc.get("query-nosupport",
_language));
lock();
try {
assertOpen();
// if collection then not extent
_collection = candidateCollection;
if (_collection != null)
_extent = null;
} finally {
unlock();
}
}
public Class getCandidateType() {
lock();
try {
assertOpen();
if (_class != null || _compiled != null || _query == null
|| _broker == null)
return _class;
// check again after compilation; maybe encoded in string
compileForCompilation();
return _class;
} finally {
unlock();
}
}
public void setCandidateType(Class candidateClass, boolean subs) {
lock();
try {
assertOpen();
assertNotReadOnly();
_class = candidateClass;
_subclasses = subs;
_loader = null;
invalidateCompilation();
} finally {
unlock();
}
}
public boolean hasSubclasses() {
return _subclasses;
}
public String getResultMappingName() {
assertOpen();
return _resultMappingName;
}
public Class getResultMappingScope() {
assertOpen();
return _resultMappingScope;
}
public void setResultMapping(Class scope, String name) {
lock();
try {
assertOpen();
_resultMappingScope = scope;
_resultMappingName = name;
_packer = null;
} finally {
unlock();
}
}
public boolean isUnique() {
lock();
try {
assertOpen();
if (_unique != null)
return _unique.booleanValue();
if (_query == null || _compiling || _broker == null)
return false;
// check again after compilation; maybe encoded in string
if (_compiled == null) {
compileForCompilation();
if (_unique != null)
return _unique.booleanValue();
}
// no explicit setting; default
StoreQuery.Executor ex = compileForExecutor();
if (!ex.isAggregate(_storeQuery))
return false;
return !ex.hasGrouping(_storeQuery);
} finally {
unlock();
}
}
public void setUnique(boolean unique) {
lock();
try {
assertOpen();
assertNotReadOnly();
_unique = (unique) ? Boolean.TRUE : Boolean.FALSE;
} finally {
unlock();
}
}
public Class getResultType() {
lock();
try {
assertOpen();
if (_resultClass != null || _compiled != null || _query == null
|| _broker == null)
return _resultClass;
// check again after compilation; maybe encoded in string
compileForCompilation();
return _resultClass;
} finally {
unlock();
}
}
public void setResultType(Class cls) {
lock();
try {
assertOpen();
// allowed modification: no read-only check
_resultClass = cls;
_packer = null;
} finally {
unlock();
}
}
public long getStartRange() {
assertOpen();
return _startIdx;
}
public long getEndRange() {
assertOpen();
return _endIdx;
}
public void setRange(long start, long end) {
if (start < 0 || end < 0)
throw new UserException(_loc.get("invalid-range",
String.valueOf(start), String.valueOf(end)));
if (end - start > Integer.MAX_VALUE && end != Long.MAX_VALUE)
throw new UserException(_loc.get("range-too-big",
String.valueOf(start), String.valueOf(end)));
lock();
try {
assertOpen();
// allowed modification: no read-only check
_startIdx = start;
_endIdx = end;
_rangeSet = true;
} finally {
unlock();
}
}
public String getParameterDeclaration() {
lock();
try {
assertOpen();
if (_params != null || _compiled != null || _compiling
|| _broker == null)
return _params;
// check again after compilation; maybe encoded in string
compileForCompilation();
return _params;
} finally {
unlock();
}
}
public void declareParameters(String params) {
if (!_storeQuery.supportsParameterDeclarations())
throw new UnsupportedException(_loc.get("query-nosupport",
_language));
lock();
try {
assertOpen();
assertNotReadOnly();
_params = StringUtils.trimToNull(params);
invalidateCompilation();
} finally {
unlock();
}
}
public void compile() {
lock();
try {
assertOpen();
StoreQuery.Executor ex = compileForExecutor();
getResultPacker(_storeQuery, ex);
ex.validate(_storeQuery);
} finally {
unlock();
}
}
public Object getCompilation() {
lock();
try {
return compileForCompilation().storeData;
} finally {
unlock();
}
}
/**
* Compile query properties.
*/
private Compilation compileForCompilation() {
if (_compiled != null || _compiling)
return _compiled;
assertNotSerialized();
assertOpen();
boolean readOnly = _readOnly;
_readOnly = false;
_compiling = true;
try {
_compiled = compilationFromCache();
return _compiled;
} catch (OpenJPAException ke) {
throw ke;
} catch (RuntimeException re) {
throw new GeneralException(re);
} finally {
_compiling = false;
_readOnly = readOnly;
}
}
/**
* Find the cached compilation for the current query, creating one if it
* does not exist.
*/
protected Compilation compilationFromCache() {
Map compCache =
_broker.getConfiguration().getQueryCompilationCacheInstance();
if (compCache == null) {
return newCompilation();
} else {
CompilationKey key = new CompilationKey();
key.queryType = _storeQuery.getClass();
key.candidateType = getCandidateType();
key.subclasses = hasSubclasses();
key.query = getQueryString();
key.language = getLanguage();
key.storeKey = _storeQuery.newCompilationKey();
Compilation comp = (Compilation) compCache.get(key);
// parse declarations if needed
boolean cache = false;
if (comp == null) {
comp = newCompilation();
// only cache those queries that can be compiled
cache = comp.storeData != null;
} else
_storeQuery.populateFromCompilation(comp.storeData);
// cache parsed state if needed
if (cache)
compCache.put(key, comp);
return comp;
}
}
/**
* Create and populate a new compilation.
*/
private Compilation newCompilation() {
Compilation comp = new Compilation();
comp.storeData = _storeQuery.newCompilation();
_storeQuery.populateFromCompilation(comp.storeData);
return comp;
}
/**
* Compile for execution, choosing between datastore and in-mem
* compilation based on what we support and our settings.
*/
private StoreQuery.Executor compileForExecutor() {
Compilation comp = compileForCompilation();
if (_collection == null) {
if (comp.datastore != null)
return comp.datastore;
if (comp.memory != null)
return comp.memory;
if (_storeQuery.supportsDataStoreExecution())
return compileForDataStore(comp);
return compileForInMemory(comp);
}
if (comp.memory != null)
return comp.memory;
if (comp.datastore != null)
return comp.datastore;
if (_storeQuery.supportsInMemoryExecution())
return compileForInMemory(comp);
return compileForDataStore(comp);
}
/**
* Create an expression tree for datastore execution.
*/
private StoreQuery.Executor compileForDataStore(Compilation comp) {
if (comp.datastore == null)
comp.datastore = createExecutor(false);
return comp.datastore;
}
/**
* Create an expression tree for in-memory execution.
*/
private StoreQuery.Executor compileForInMemory(Compilation comp) {
if (comp.memory == null)
comp.memory = createExecutor(true);
return comp.memory;
}
/**
* Return a query executor of the proper type.
*/
private StoreQuery.Executor createExecutor(boolean inMem) {
assertCandidateType();
MetaDataRepository repos = _broker.getConfiguration().
getMetaDataRepositoryInstance();
ClassMetaData meta = repos.getMetaData(_class,
_broker.getClassLoader(), false);
ClassMetaData[] metas;
if (_class == null || _storeQuery.supportsAbstractExecutors())
metas = new ClassMetaData[]{ meta };
else if (_subclasses && (meta == null || meta.isManagedInterface()))
metas = repos.getImplementorMetaDatas(_class,
_broker.getClassLoader(), true);
else if (meta != null && (_subclasses || meta.isMapped()))
metas = new ClassMetaData[]{ meta };
else
metas = StoreQuery.EMPTY_METAS;
if (metas.length == 0)
throw new UserException(_loc.get("no-impls", _class));
try {
if (metas.length == 1) {
if (inMem)
return _storeQuery.newInMemoryExecutor(metas[0],
_subclasses);
return _storeQuery.newDataStoreExecutor(metas[0], _subclasses);
}
// multiple implementors
StoreQuery.Executor[] es = new StoreQuery.Executor[metas.length];
for (int i = 0; i < es.length; i++) {
if (inMem)
es[i] = _storeQuery.newInMemoryExecutor(metas[i], true);
else
es[i] = _storeQuery.newDataStoreExecutor(metas[i], true);
}
return new MergedExecutor(es);
} catch (OpenJPAException ke) {
throw ke;
} catch (RuntimeException re) {
throw new GeneralException(re);
}
}
/**
* Clear any compilation, forcing this query to be recompiled
* next time it's executed. This should be invoked whenever any
* state changes that would cause the underlying query
* representation to change.
*
* @since 0.3.0
*/
private boolean invalidateCompilation() {
if (_compiling)
return false;
_storeQuery.invalidateCompilation();
_compiled = null;
_packer = null;
return true;
}
public Object execute() {
return execute((Object[]) null);
}
public Object execute(Object[] params) {
return execute(OP_SELECT, params);
}
public Object execute(Map params) {
return execute(OP_SELECT, params);
}
private Object execute(int operation, Object[] params) {
if (params == null)
params = StoreQuery.EMPTY_OBJECTS;
lock();
try {
assertNotSerialized();
_broker.beginOperation(true);
try {
assertOpen();
_broker.assertNontransactionalRead();
// get executor
Compilation comp = compileForCompilation();
StoreQuery.Executor ex = (isInMemory(operation))
? compileForInMemory(comp) : compileForDataStore(comp);
assertParameters(_storeQuery, ex, params);
if (_log.isTraceEnabled())
logExecution(operation, ex.getParameterTypes(_storeQuery),
params);
if (operation == OP_SELECT)
return execute(_storeQuery, ex, params);
if (operation == OP_DELETE)
return delete(_storeQuery, ex, params);
if (operation == OP_UPDATE)
return update(_storeQuery, ex, params);
throw new UnsupportedException();
} catch (OpenJPAException ke) {
throw ke;
} catch (Exception e) {
throw new UserException(e);
} finally {
_broker.endOperation();
}
}
finally {
unlock();
}
}
private Object execute(int operation, Map params) {
if (params == null)
params = Collections.EMPTY_MAP;
lock();
try {
_broker.beginOperation(true);
try {
assertNotSerialized();
assertOpen();
_broker.assertNontransactionalRead();
// get executor
Compilation comp = compileForCompilation();
StoreQuery.Executor ex = (isInMemory(operation))
? compileForInMemory(comp) : compileForDataStore(comp);
Object[] arr = (params.isEmpty()) ? StoreQuery.EMPTY_OBJECTS :
toParameterArray(ex.getParameterTypes(_storeQuery), params);
assertParameters(_storeQuery, ex, arr);
if (_log.isTraceEnabled())
logExecution(operation, params);
if (operation == OP_SELECT)
return execute(_storeQuery, ex, arr);
if (operation == OP_DELETE)
return delete(_storeQuery, ex, arr);
if (operation == OP_UPDATE)
return update(_storeQuery, ex, arr);
throw new UnsupportedException();
} catch (OpenJPAException ke) {
throw ke;
} catch (Exception e) {
throw new UserException(e);
} finally {
_broker.endOperation();
}
}
finally {
unlock();
}
}
public long deleteAll() {
return deleteAll((Object[]) null);
}
public long deleteAll(Object[] params) {
return ((Number) execute(OP_DELETE, params)).longValue();
}
public long deleteAll(Map params) {
return ((Number) execute(OP_DELETE, params)).longValue();
}
public long updateAll() {
return updateAll((Object[]) null);
}
public long updateAll(Object[] params) {
return ((Number) execute(OP_UPDATE, params)).longValue();
}
public long updateAll(Map params) {
return ((Number) execute(OP_UPDATE, params)).longValue();
}
private Object[] toParameterArray(LinkedMap paramTypes, Map params) {
if (params == null || params.isEmpty())
return StoreQuery.EMPTY_OBJECTS;
Object[] arr = new Object[params.size()];
Map.Entry entry;
Object key;
int idx;
int base = -1;
for (Iterator itr = params.entrySet().iterator(); itr.hasNext();) {
entry = (Map.Entry) itr.next();
key = entry.getKey();
idx = (paramTypes == null) ? -1 : paramTypes.indexOf(key);
// allow positional parameters and natural order parameters
if (idx != -1)
arr[idx] = entry.getValue();
else if (key instanceof Number) {
if (base == -1)
base = positionalParameterBase(params.keySet());
arr[((Number) key).intValue() - base] = entry.getValue();
} else
throw new UserException(_loc.get("bad-param-name", key));
}
return arr;
}
/**
* Return the base (generally 0 or 1) to use for positional parameters.
*/
private static int positionalParameterBase(Collection params) {
int low = Integer.MAX_VALUE;
Object obj;
int val;
for (Iterator itr = params.iterator(); itr.hasNext();) {
obj = itr.next();
if (!(obj instanceof Number))
return 0; // use 0 base when params are mixed types
val = ((Number) obj).intValue();
if (val == 0)
return val;
if (val < low)
low = val;
}
return low;
}
/**
* Return whether we should execute this query in memory.
*/
private boolean isInMemory(int operation) {
// if there are any dirty instances in the current trans that are
// involved in this query, we have to execute in memory or flush
boolean inMem = !_storeQuery.supportsDataStoreExecution()
|| _collection != null;
if (!inMem && (!_ignoreChanges || operation != OP_SELECT)
&& _broker.isActive() && isAccessPathDirty()) {
int flush = _fc.getFlushBeforeQueries();
if ((flush == FLUSH_TRUE
|| (flush == FLUSH_WITH_CONNECTION && _broker.hasConnection())
|| operation != OP_SELECT
|| !_storeQuery.supportsInMemoryExecution())
&& _broker.getConfiguration().supportedOptions().
contains(OpenJPAConfiguration.OPTION_INC_FLUSH)) {
_broker.flush();
} else {
if (_log.isInfoEnabled())
_log.info(_loc.get("force-in-mem", _class));
inMem = true;
}
}
if (inMem && !_storeQuery.supportsInMemoryExecution())
throw new InvalidStateException(_loc.get("cant-exec-inmem",
_language));
return inMem;
}
/**
* Execute the query using the given compilation, executor, and parameter
* values. All other execute methods delegate to this one or to
* {@link #execute(StoreQuery.Executor,Map)} after validation and locking.
*/
private Object execute(StoreQuery q, StoreQuery.Executor ex,
Object[] params)
throws Exception {
// if this is an impossible result range, return null / empty list
StoreQuery.Range range = new StoreQuery.Range(_startIdx, _endIdx);
if (!_rangeSet)
ex.getRange(q, params, range);
if (range.start >= range.end)
return emptyResult(q, ex);
// execute; if we have a result class or we have only one result
// and so need to remove it from its array, wrap in a packing rop
range.lrs = isLRS(range.start, range.end);
ResultObjectProvider rop = ex.executeQuery(q, params, range);
try {
return toResult(q, ex, rop, range);
} catch (Exception e) {
if (rop != null)
try { rop.close(); } catch (Exception e2) {}
throw e;
}
}
/**
* Delete the query using the given executor, and parameter
* values. All other execute methods delegate to this one or to
* {@link #delete(StoreQuery.Executor,Map)} after validation and locking.
* The return value will be a Number indicating the number of
* instances deleted.
*/
private Number delete(StoreQuery q, StoreQuery.Executor ex, Object[] params)
throws Exception {
assertBulkModify(q, ex, params);
return ex.executeDelete(q, params);
}
public Number deleteInMemory(StoreQuery q, StoreQuery.Executor executor,
Object[] params) {
try {
Object o = execute(q, executor, params);
if (!(o instanceof Collection))
o = Collections.singleton(o);
int size = 0;
for (Iterator i = ((Collection) o).iterator(); i.hasNext(); size++)
_broker.delete(i.next(), null);
return Numbers.valueOf(size);
} catch (OpenJPAException ke) {
throw ke;
} catch (Exception e) {
throw new UserException(e);
}
}
/**
* Update the query using the given compilation, executor, and parameter
* values. All other execute methods delegate to this one or to
* {@link #update(StoreQuery.Executor,Map)} after validation and locking.
* The return value will be a Number indicating the number of
* instances updated.
*/
private Number update(StoreQuery q, StoreQuery.Executor ex, Object[] params)
throws Exception {
assertBulkModify(q, ex, params);
return ex.executeUpdate(q, params);
}
public Number updateInMemory(StoreQuery q, StoreQuery.Executor executor,
Object[] params) {
try {
Object o = execute(q, executor, params);
if (!(o instanceof Collection))
o = Collections.singleton(o);
int size = 0;
for (Iterator i = ((Collection) o).iterator(); i.hasNext(); size++)
updateInMemory(i.next(), params, q);
return Numbers.valueOf(size);
} catch (OpenJPAException ke) {
throw ke;
} catch (Exception e) {
throw new UserException(e);
}
}
/**
* Set the values for the updates in memory.
*
* @param ob the persistent instance to change
* @param params the parameters passed to the query
*/
private void updateInMemory(Object ob, Object[] params, StoreQuery q) {
for (Iterator it = getUpdates().entrySet().iterator();
it.hasNext();) {
Map.Entry e = (Map.Entry) it.next();
Path path = (Path) e.getKey();
FieldMetaData fmd = (FieldMetaData) path.last();
OpenJPAStateManager sm = _broker.getStateManager(ob);
Object val;
Object value = e.getValue();
if (value instanceof Val) {
val = ((Val) value).
evaluate(ob, null, getStoreContext(), params);
} else if (value instanceof Literal) {
val = ((Literal) value).getValue();
} else if (value instanceof Constant) {
val = ((Constant) value).getValue(params);
} else {
try {
val = q.evaluate(value, ob, params, sm);
} catch (UnsupportedException e1) {
throw new UserException(_loc.get("fail-to-get-update-value"));
}
}
int i = fmd.getIndex();
PersistenceCapable into = ImplHelper.toPersistenceCapable(ob,
_broker.getConfiguration());
// set the actual field in the instance
int set = OpenJPAStateManager.SET_USER;
switch (fmd.getDeclaredTypeCode()) {
case JavaTypes.BOOLEAN:
sm.settingBooleanField(into, i, sm.fetchBooleanField(i),
val == null ? false : ((Boolean) val).booleanValue(),
set);
break;
case JavaTypes.BYTE:
sm.settingByteField(into, i, sm.fetchByteField(i),
val == null ? 0 : ((Number) val).byteValue(), set);
break;
case JavaTypes.CHAR:
sm.settingCharField(into, i, sm.fetchCharField(i),
val == null ? 0 : val.toString().charAt(0), set);
break;
case JavaTypes.DOUBLE:
sm.settingDoubleField(into, i, sm.fetchDoubleField(i),
val == null ? 0 : ((Number) val).doubleValue(), set);
break;
case JavaTypes.FLOAT:
sm.settingFloatField(into, i, sm.fetchFloatField(i),
val == null ? 0 : ((Number) val).floatValue(), set);
break;
case JavaTypes.INT:
sm.settingIntField(into, i, sm.fetchIntField(i),
val == null ? 0 : ((Number) val).intValue(), set);
break;
case JavaTypes.LONG:
sm.settingLongField(into, i, sm.fetchLongField(i),
val == null ? 0 : ((Number) val).longValue(), set);
break;
case JavaTypes.SHORT:
sm.settingShortField(into, i, sm.fetchShortField(i),
val == null ? 0 : ((Number) val).shortValue(), set);
break;
case JavaTypes.STRING:
sm.settingStringField(into, i, sm.fetchStringField(i),
val == null ? null : val.toString(), set);
break;
case JavaTypes.DATE:
case JavaTypes.NUMBER:
case JavaTypes.BOOLEAN_OBJ:
case JavaTypes.BYTE_OBJ:
case JavaTypes.CHAR_OBJ:
case JavaTypes.DOUBLE_OBJ:
case JavaTypes.FLOAT_OBJ:
case JavaTypes.INT_OBJ:
case JavaTypes.LONG_OBJ:
case JavaTypes.SHORT_OBJ:
case JavaTypes.BIGDECIMAL:
case JavaTypes.BIGINTEGER:
case JavaTypes.LOCALE:
case JavaTypes.OBJECT:
case JavaTypes.OID:
sm.settingObjectField(into, i, sm.fetchObjectField(i), val,
set);
break;
default:
throw new UserException(_loc.get("only-update-primitives"));
}
}
}
/**
* Trace log that the query is executing.
*/
private void logExecution(int op, LinkedMap types, Object[] params) {
Map pmap = Collections.EMPTY_MAP;
if (params.length > 0) {
pmap = new HashMap((int) (params.length * 1.33 + 1));
if (types != null && types.size() == params.length) {
int i = 0;
for (Iterator itr = types.keySet().iterator(); itr.hasNext();)
pmap.put(itr.next(), params[i++]);
} else {
for (int i = 0; i < params.length; i++)
pmap.put(String.valueOf(i), params[i]);
}
}
logExecution(op, pmap);
}
/**
* Trace log that the query is executing.
*/
private void logExecution(int op, Map params) {
String s = _query;
if (StringUtils.isEmpty(s))
s = toString();
String msg = "executing-query";
if (!params.isEmpty())
msg += "-with-params";
_log.trace(_loc.get(msg, s, params));
}
/**
* Return whether this should be treated as a potential large result set.
*/
private boolean isLRS(long start, long end) {
long range = end - start;
return _fc.getFetchBatchSize() >= 0
&& !(range <= _fc.getFetchBatchSize()
|| (_fc.getFetchBatchSize() == 0 && range <= 50));
}
/**
* Return the query result for the given result object provider.
*/
protected Object toResult(StoreQuery q, StoreQuery.Executor ex,
ResultObjectProvider rop, StoreQuery.Range range)
throws Exception {
// pack projections if necessary
String[] aliases = ex.getProjectionAliases(q);
if (!ex.isPacking(q)) {
ResultPacker packer = getResultPacker(q, ex);
if (packer != null || aliases.length == 1)
rop = new PackingResultObjectProvider(rop, packer,
aliases.length);
}
// if single result, extract it
if (_unique == Boolean.TRUE || (aliases.length > 0
&& !ex.hasGrouping(q) && ex.isAggregate(q)))
return singleResult(rop, range);
// now that we've executed the query, we can call isAggregate and
// hasGrouping efficiently
boolean detach = (_broker.getAutoDetach() &
AutoDetach.DETACH_NONTXREAD) > 0 && !_broker.isActive();
boolean lrs = range.lrs && !ex.isAggregate(q) && !ex.hasGrouping(q);
ResultList res = (!detach && lrs) ? _fc.newResultList(rop)
: new EagerResultList(rop);
_resultLists.add(decorateResultList(res));
return res;
}
/**
* Optionally decorate the native result.
*/
protected ResultList decorateResultList(ResultList res) {
return new RemoveOnCloseResultList(res);
}
/**
* Return a result packer for this projection, or null.
*/
private ResultPacker getResultPacker(StoreQuery q, StoreQuery.Executor ex) {
if (_packer != null)
return _packer;
Class resultClass = (_resultClass != null) ? _resultClass
: ex.getResultClass(q);
if (resultClass == null)
return null;
String[] aliases = ex.getProjectionAliases(q);
if (aliases.length == 0) {
// result class but no result; means candidate is being set
// into some result class
_packer = new ResultPacker(_class, getAlias(), resultClass);
} else if (resultClass != null) {
// projection
Class[] types = ex.getProjectionTypes(q);
_packer = new ResultPacker(types, aliases, resultClass);
}
return _packer;
}
/**
* Create an empty result for this query.
*/
private Object emptyResult(StoreQuery q, StoreQuery.Executor ex) {
if (_unique == Boolean.TRUE || (_unique == null
&& !ex.hasGrouping(q) && ex.isAggregate(q)))
return null;
return Collections.EMPTY_LIST;
}
/**
* Extract an expected single result from the given provider. Used when
* the result is an ungrouped aggregate or the unique flag is set to true.
*/
private Object singleResult(ResultObjectProvider rop,
StoreQuery.Range range)
throws Exception {
rop.open();
try {
// move to expected result
boolean next = rop.next();
// extract single result; throw an exception if multiple results
// match and not constrainted by range, or if a unique query with
// no results
Object single = null;
if (next) {
single = rop.getResultObject();
if (range.end != range.start + 1 && rop.next())
throw new NonUniqueResultException(_loc.get("not-unique",
_class, _query));
} else if (_unique == Boolean.TRUE)
throw new NoResultException(_loc.get("no-result",
_class, _query));
// if unique set to false, use collection
if (_unique == Boolean.FALSE) {
if (!next)
return Collections.EMPTY_LIST;
// Collections.singletonList is JDK 1.3, so...
return Arrays.asList(new Object[]{ single });
}
// return single result
return single;
} finally {
rop.close();
}
}
/**
* Calculates whether the access path of this query intersects with
* any dirty objects in the transaction.
*/
private boolean isAccessPathDirty() {
return isAccessPathDirty(_broker, getAccessPathMetaDatas());
}
public static boolean isAccessPathDirty(Broker broker,
ClassMetaData[] accessMetas) {
Collection persisted = broker.getPersistedTypes();
Collection updated = broker.getUpdatedTypes();
Collection deleted = broker.getDeletedTypes();
if (persisted.isEmpty() && updated.isEmpty() && deleted.isEmpty())
return false;
// if no access metas, assume every dirty object affects path just
// to be safe
if (accessMetas.length == 0)
return true;
// compare dirty classes to the access path classes
Class accClass;
for (int i = 0; i < accessMetas.length; i++) {
// shortcut if actual class is dirty
accClass = accessMetas[i].getDescribedType();
if (persisted.contains(accClass) || updated.contains(accClass)
|| deleted.contains(accClass))
return true;
// check for dirty subclass
for (Iterator dirty = persisted.iterator(); dirty.hasNext();)
if (accClass.isAssignableFrom((Class) dirty.next()))
return true;
for (Iterator dirty = updated.iterator(); dirty.hasNext();)
if (accClass.isAssignableFrom((Class) dirty.next()))
return true;
for (Iterator dirty = deleted.iterator(); dirty.hasNext();)
if (accClass.isAssignableFrom((Class) dirty.next()))
return true;
}
// no intersection
return false;
}
public void closeAll() {
closeResults(true);
}
public void closeResources() {
closeResults(false);
}
/**
* Close open results.
*/
private void closeResults(boolean force) {
lock();
try {
assertOpen();
RemoveOnCloseResultList res;
for (Iterator itr = _resultLists.iterator(); itr.hasNext();) {
res = (RemoveOnCloseResultList) itr.next();
if (force || res.isProviderOpen())
res.close(false);
}
_resultLists.clear();
} finally {
unlock();
}
}
public String[] getDataStoreActions(Map params) {
if (params == null)
params = Collections.EMPTY_MAP;
lock();
try {
assertNotSerialized();
assertOpen();
StoreQuery.Executor ex = compileForExecutor();
Object[] arr = toParameterArray(ex.getParameterTypes(_storeQuery),
params);
assertParameters(_storeQuery, ex, arr);
StoreQuery.Range range = new StoreQuery.Range(_startIdx, _endIdx);
if (!_rangeSet)
ex.getRange(_storeQuery, arr, range);
return ex.getDataStoreActions(_storeQuery, arr, range);
} catch (OpenJPAException ke) {
throw ke;
} catch (Exception e) {
throw new UserException(e);
} finally {
unlock();
}
}
public boolean setQuery(Object query) {
lock();
try {
assertOpen();
assertNotReadOnly();
if (query == null || query instanceof String) {
invalidateCompilation();
_query = (String) query;
if (_query != null)
_query = _query.trim();
return true;
}
if (!(query instanceof QueryImpl))
return _storeQuery.setQuery(query);
// copy all non-transient state from the given query
invalidateCompilation();
QueryImpl q = (QueryImpl) query;
_class = q._class;
_subclasses = q._subclasses;
_query = q._query;
_ignoreChanges = q._ignoreChanges;
_unique = q._unique;
_resultClass = q._resultClass;
_params = q._params;
_resultMappingScope = q._resultMappingScope;
_resultMappingName = q._resultMappingName;
_readOnly = q._readOnly;
// don't share mutable objects
_fc.copy(q._fc);
if (q._filtListeners != null)
_filtListeners = new HashMap(q._filtListeners);
if (q._aggListeners != null)
_aggListeners = new HashMap(q._aggListeners);
return true;
} finally {
unlock();
}
}
public String getAlias() {
lock();
try {
String alias = compileForExecutor().getAlias(_storeQuery);
if (alias == null)
alias = Strings.getClassName(_class);
return alias;
} finally {
unlock();
}
}
public String[] getProjectionAliases() {
lock();
try {
return compileForExecutor().getProjectionAliases(_storeQuery);
} finally {
unlock();
}
}
public Class[] getProjectionTypes() {
lock();
try {
return compileForExecutor().getProjectionTypes(_storeQuery);
} finally {
unlock();
}
}
public int getOperation() {
lock();
try {
return compileForExecutor().getOperation(_storeQuery);
} finally {
unlock();
}
}
public boolean isAggregate() {
lock();
try {
return compileForExecutor().isAggregate(_storeQuery);
} finally {
unlock();
}
}
public boolean hasGrouping() {
lock();
try {
return compileForExecutor().hasGrouping(_storeQuery);
} finally {
unlock();
}
}
public ClassMetaData[] getAccessPathMetaDatas() {
lock();
try {
ClassMetaData[] metas = compileForExecutor().
getAccessPathMetaDatas(_storeQuery);
return (metas == null) ? StoreQuery.EMPTY_METAS : metas;
} finally {
unlock();
}
}
public LinkedMap getParameterTypes() {
lock();
try {
return compileForExecutor().getParameterTypes(_storeQuery);
} finally {
unlock();
}
}
public Map getUpdates() {
lock();
try {
return compileForExecutor().getUpdates(_storeQuery);
} finally {
unlock();
}
}
public void lock() {
if (_lock != null)
_lock.lock();
}
public void unlock() {
if (_lock != null && _lock.isLocked())
_lock.unlock();
}
/////////
// Utils
/////////
public Class classForName(String name, String[] imports) {
// full class name or primitive type?
Class type = toClass(name);
if (type != null)
return type;
// first check the aliases map in the MetaDataRepository
ClassLoader loader = (_class == null) ? _loader
: (ClassLoader) AccessController.doPrivileged(
J2DoPrivHelper.getClassLoaderAction(_class));
ClassMetaData meta = _broker.getConfiguration().
getMetaDataRepositoryInstance().getMetaData(name, loader, false);
if (meta != null)
return meta.getDescribedType();
// try the name in the package of the candidate class
if (_class != null) {
String fullName = _class.getName().substring
(0, _class.getName().lastIndexOf('.') + 1) + name;
type = toClass(fullName);
if (type != null)
return type;
}
// try java.lang
type = toClass("java.lang." + name);
if (type != null)
return type;
// try each import
if (imports != null && imports.length > 0) {
String dotName = "." + name;
String importName;
for (int i = 0; i < imports.length; i++) {
importName = imports[i];
// full class name import
if (importName.endsWith(dotName))
type = toClass(importName);
// wildcard; strip to package
else if (importName.endsWith(".*")) {
importName = importName.substring
(0, importName.length() - 1);
type = toClass(importName + name);
}
if (type != null)
return type;
}
}
return null;
}
/**
* Return the {@link Class} for the given name, or null if name not valid.
*/
private Class toClass(String name) {
if (_loader == null)
_loader = _broker.getConfiguration().getClassResolverInstance().
getClassLoader(_class, _broker.getClassLoader());
try {
return Strings.toClass(name, _loader);
} catch (RuntimeException re) {
} catch (NoClassDefFoundError ncdfe) {
}
return null;
}
public void assertOpen() {
if (_broker != null)
_broker.assertOpen();
}
public void assertNotReadOnly() {
if (_readOnly)
throw new InvalidStateException(_loc.get("read-only"));
}
public void assertNotSerialized() {
if (_broker == null)
throw new InvalidStateException(_loc.get("serialized"));
}
/**
* Check that a candidate class has been set for the query.
*/
private void assertCandidateType() {
if (_class == null && _storeQuery.requiresCandidateType())
throw new InvalidStateException(_loc.get("no-class"));
}
/**
* Check that we are in a state to be able to perform a bulk operation;
* also flush the current modfications if any elements are currently dirty.
*/
private void assertBulkModify(StoreQuery q, StoreQuery.Executor ex,
Object[] params) {
_broker.assertActiveTransaction();
if (_startIdx != 0 || _endIdx != Long.MAX_VALUE)
throw new UserException(_loc.get("no-modify-range"));
if (_resultClass != null)
throw new UserException(_loc.get("no-modify-resultclass"));
StoreQuery.Range range = new StoreQuery.Range();
ex.getRange(q, params, range);
if (range.start != 0 || range.end != Long.MAX_VALUE)
throw new UserException(_loc.get("no-modify-range"));
}
/**
* Checks that the passed parameters match the declarations.
*/
protected void assertParameters(StoreQuery q, StoreQuery.Executor ex,
Object[] params) {
if (!q.requiresParameterDeclarations())
return;
LinkedMap paramTypes = ex.getParameterTypes(q);
int typeCount = paramTypes.size();
if (typeCount > params.length)
throw new UserException(_loc.get("unbound-params",
paramTypes.keySet()));
Iterator itr = paramTypes.entrySet().iterator();
Map.Entry entry;
for (int i = 0; itr.hasNext(); i++) {
entry = (Map.Entry) itr.next();
if (((Class) entry.getValue()).isPrimitive() && params[i] == null)
throw new UserException(_loc.get("null-primitive-param",
entry.getKey()));
}
}
public String toString() {
StringBuffer buf = new StringBuffer(64);
buf.append("Query: ").append(super.toString());
buf.append("; candidate class: ").append(_class);
buf.append("; query: ").append(_query);
return buf.toString();
}
/**
* Struct of compiled query properties.
*/
protected static class Compilation
implements Serializable {
public StoreQuery.Executor memory = null;
public StoreQuery.Executor datastore = null;
public Object storeData = null;
}
/**
* Struct to hold the unparsed properties associated with a query.
*/
private static class CompilationKey
implements Serializable {
public Class queryType = null;
public Class candidateType = null;
public boolean subclasses = true;
public String query = null;
public String language = null;
public Object storeKey = null;
public int hashCode() {
int rs = 17;
rs = 37 * rs + ((queryType == null) ? 0 : queryType.hashCode());
rs = 37 * rs + ((query == null) ? 0 : query.hashCode());
rs = 37 * rs + ((language == null) ? 0 : language.hashCode());
rs = 37 * rs + ((storeKey == null) ? 0 : storeKey.hashCode());
if (subclasses)
rs++;
return rs;
}
public boolean equals(Object other) {
if (other == this)
return true;
if (other == null || other.getClass() != getClass())
return false;
CompilationKey key = (CompilationKey) other;
if (key.queryType != queryType
|| !StringUtils.equals(key.query, query)
|| !StringUtils.equals(key.language, language))
return false;
if (key.subclasses != subclasses)
return false;
if (!ObjectUtils.equals(key.storeKey, storeKey))
return false;
// allow either candidate type to be null because it might be
// encoded in the query string, but if both are set then they
// must be equal
return key.candidateType == null || candidateType == null
|| key.candidateType == candidateType;
}
}
/**
* A merged executor executes multiple Queries and returns
* a merged result list with the appropriate ordering (if more than
* one query needs to be executed). This executor has the following
* limitations:
*
*
It cannot combine aggregates.
*
It cannot collate the result lists if ordering is specified and
* a result string is given, but does not include the ordering
* criteria.
*
It cannot filter duplicate results from different result lists if
* the result is marked distinct. This would require tracking all
* previous results, which would interfere with large result set
* handling.
*
*
* @author Marc Prud'hommeaux
* @nojavadoc
*/
private static class MergedExecutor
implements StoreQuery.Executor {
private final StoreQuery.Executor[] _executors;
public MergedExecutor(StoreQuery.Executor[] executors) {
_executors = executors;
}
public ResultObjectProvider executeQuery(StoreQuery q,
Object[] params, StoreQuery.Range range) {
if (_executors.length == 1)
return _executors[0].executeQuery(q, params, range);
// use lrs settings if we couldn't take advantage of the start index
// so that hopefully the skip to the start will be efficient
StoreQuery.Range ropRange = new StoreQuery.Range(0, range.end);
ropRange.lrs = range.lrs || (range.start > 0 && q.getContext().
getFetchConfiguration().getFetchBatchSize() >= 0);
// execute the query; we cannot use the lower bound of the result
// range, but we can take advantage of the upper bound
ResultObjectProvider[] rops =
new ResultObjectProvider[_executors.length];
for (int i = 0; i < _executors.length; i++)
rops[i] = _executors[i].executeQuery(q, params, ropRange);
boolean[] asc = _executors[0].getAscending(q);
ResultObjectProvider rop;
if (asc.length == 0)
rop = new MergedResultObjectProvider(rops);
else
rop = new OrderingMergedResultObjectProvider(rops, asc,
_executors, q, params);
// if there is a lower bound, wrap in range rop
if (range.start != 0)
rop = new RangeResultObjectProvider(rop, range.start,
range.end);
return rop;
}
public Number executeDelete(StoreQuery q, Object[] params) {
long num = 0;
for (int i = 0; i < _executors.length; i++)
num += _executors[i].executeDelete(q, params).longValue();
return Numbers.valueOf(num);
}
public Number executeUpdate(StoreQuery q, Object[] params) {
long num = 0;
for (int i = 0; i < _executors.length; i++)
num += _executors[i].executeUpdate(q, params).longValue();
return Numbers.valueOf(num);
}
public String[] getDataStoreActions(StoreQuery q, Object[] params,
StoreQuery.Range range) {
if (_executors.length == 1)
return _executors[0].getDataStoreActions(q, params, range);
List results = new ArrayList(_executors.length);
StoreQuery.Range ropRange = new StoreQuery.Range(0L, range.end);
String[] actions;
for (int i = 0; i < _executors.length; i++) {
actions = _executors[i].getDataStoreActions(q, params,ropRange);
if (actions != null && actions.length > 0)
results.addAll(Arrays.asList(actions));
}
return (String[]) results.toArray(new String[results.size()]);
}
public void validate(StoreQuery q) {
_executors[0].validate(q);
}
public void getRange(StoreQuery q, Object[] params,
StoreQuery.Range range) {
_executors[0].getRange(q, params, range);
}
public Object getOrderingValue(StoreQuery q, Object[] params,
Object resultObject, int idx) {
// unfortunately, at this point (must be a merged rop containing
// other merged rops) we have no idea which executor to extract
// the value from
return _executors[0].getOrderingValue(q, params, resultObject, idx);
}
public boolean[] getAscending(StoreQuery q) {
return _executors[0].getAscending(q);
}
public String getAlias(StoreQuery q) {
return _executors[0].getAlias(q);
}
public String[] getProjectionAliases(StoreQuery q) {
return _executors[0].getProjectionAliases(q);
}
public Class getResultClass(StoreQuery q) {
return _executors[0].getResultClass(q);
}
public Class[] getProjectionTypes(StoreQuery q) {
return _executors[0].getProjectionTypes(q);
}
public boolean isPacking(StoreQuery q) {
return _executors[0].isPacking(q);
}
public ClassMetaData[] getAccessPathMetaDatas(StoreQuery q) {
if (_executors.length == 1)
return _executors[0].getAccessPathMetaDatas(q);
// create set of base class metadatas in access path
List metas = null;
for (int i = 0; i < _executors.length; i++)
metas = Filters.addAccessPathMetaDatas(metas, _executors[i].
getAccessPathMetaDatas(q));
if (metas == null)
return StoreQuery.EMPTY_METAS;
return (ClassMetaData[]) metas.toArray
(new ClassMetaData[metas.size()]);
}
public boolean isAggregate(StoreQuery q) {
if (!_executors[0].isAggregate(q))
return false;
// we can't merge aggregates
throw new UnsupportedException(_loc.get("merged-aggregate",
q.getContext().getCandidateType(),
q.getContext().getQueryString()));
}
public int getOperation(StoreQuery q) {
return _executors[0].getOperation(q);
}
public boolean hasGrouping(StoreQuery q) {
return _executors[0].hasGrouping(q);
}
public LinkedMap getParameterTypes(StoreQuery q) {
return _executors[0].getParameterTypes(q);
}
public Map getUpdates(StoreQuery q) {
return _executors[0].getUpdates(q);
}
}
/**
* Result object provider that packs results before returning them.
*/
private static class PackingResultObjectProvider
implements ResultObjectProvider {
private final ResultObjectProvider _delegate;
private final ResultPacker _packer;
private final int _len;
public PackingResultObjectProvider(ResultObjectProvider delegate,
ResultPacker packer, int resultLength) {
_delegate = delegate;
_packer = packer;
_len = resultLength;
}
public boolean supportsRandomAccess() {
return _delegate.supportsRandomAccess();
}
public void open()
throws Exception {
_delegate.open();
}
public Object getResultObject()
throws Exception {
Object ob = _delegate.getResultObject();
if (_packer == null && _len == 1)
return ((Object[]) ob)[0];
if (_packer == null)
return ob;
if (_len == 0)
return _packer.pack(ob);
return _packer.pack((Object[]) ob);
}
public boolean next()
throws Exception {
return _delegate.next();
}
public boolean absolute(int pos)
throws Exception {
return _delegate.absolute(pos);
}
public int size()
throws Exception {
return _delegate.size();
}
public void reset()
throws Exception {
_delegate.reset();
}
public void close()
throws Exception {
_delegate.close();
}
public void handleCheckedException(Exception e) {
_delegate.handleCheckedException(e);
}
}
/**
* Result list that removes itself from the query's open result list
* when it is closed. Public for testing.
*/
public class RemoveOnCloseResultList
implements ResultList {
private final ResultList _res;
public RemoveOnCloseResultList(ResultList res) {
_res = res;
}
public ResultList getDelegate() {
return _res;
}
public boolean isProviderOpen() {
return _res.isProviderOpen();
}
public boolean isClosed() {
return _res.isClosed();
}
public void close() {
close(true);
}
public void close(boolean remove) {
if (isClosed())
return;
_res.close();
if (!remove)
return;
lock();
try {
// don't use standard _resultLists.remove method b/c relies on
// collection equality, which relies on element equality, which
// means we end up traversing entire result lists!
for (Iterator itr = _resultLists.iterator(); itr.hasNext();) {
if (itr.next() == this) {
itr.remove();
break;
}
}
} finally {
unlock();
}
}
public int size() {
return _res.size();
}
public boolean isEmpty() {
return _res.isEmpty();
}
public boolean contains(Object o) {
return _res.contains(o);
}
public Iterator iterator() {
return _res.iterator();
}
public Object[] toArray() {
return _res.toArray();
}
public Object[] toArray(Object[] a) {
return _res.toArray(a);
}
public boolean add(Object o) {
return _res.add(o);
}
public boolean remove(Object o) {
return _res.remove(o);
}
public boolean containsAll(Collection c) {
return _res.containsAll(c);
}
public boolean addAll(Collection c) {
return _res.addAll(c);
}
public boolean addAll(int idx, Collection c) {
return _res.addAll(idx, c);
}
public boolean removeAll(Collection c) {
return _res.removeAll(c);
}
public boolean retainAll(Collection c) {
return _res.retainAll(c);
}
public void clear() {
_res.clear();
}
public Object get(int idx) {
return _res.get(idx);
}
public Object set(int idx, Object o) {
return _res.set(idx, o);
}
public void add(int idx, Object o) {
_res.add(idx, o);
}
public Object remove(int idx) {
return _res.remove(idx);
}
public int indexOf(Object o) {
return _res.indexOf(o);
}
public int lastIndexOf(Object o) {
return _res.lastIndexOf(o);
}
public ListIterator listIterator() {
return _res.listIterator();
}
public ListIterator listIterator(int idx) {
return _res.listIterator(idx);
}
public List subList(int start, int end) {
return _res.subList(start, end);
}
public boolean equals(Object o) {
return _res.equals(o);
}
public int hashCode() {
return _res.hashCode();
}
public String toString ()
{
return _res.toString ();
}
public Object writeReplace ()
{
return _res;
}
}
}
