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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.jdbc.kernel.exps;
import java.io.Serializable;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.ListIterator;
import org.apache.commons.lang.ObjectUtils;
import org.apache.openjpa.jdbc.kernel.JDBCFetchConfiguration;
import org.apache.openjpa.jdbc.kernel.JDBCStoreQuery;
import org.apache.openjpa.jdbc.meta.ClassMapping;
import org.apache.openjpa.jdbc.meta.Discriminator;
import org.apache.openjpa.jdbc.meta.FieldMapping;
import org.apache.openjpa.jdbc.meta.Strategy;
import org.apache.openjpa.jdbc.meta.ValueMapping;
import org.apache.openjpa.jdbc.meta.strats.HandlerCollectionTableFieldStrategy;
import org.apache.openjpa.jdbc.meta.strats.HandlerHandlerMapTableFieldStrategy;
import org.apache.openjpa.jdbc.meta.strats.LRSMapFieldStrategy;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.jdbc.schema.ForeignKey;
import org.apache.openjpa.jdbc.schema.Schemas;
import org.apache.openjpa.jdbc.sql.Joins;
import org.apache.openjpa.jdbc.sql.Result;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.Broker;
import org.apache.openjpa.kernel.Filters;
import org.apache.openjpa.kernel.OpenJPAStateManager;
import org.apache.openjpa.kernel.StoreContext;
import org.apache.openjpa.kernel.exps.CandidatePath;
import org.apache.openjpa.kernel.exps.Context;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.meta.ClassMetaData;
import org.apache.openjpa.meta.FieldMetaData;
import org.apache.openjpa.meta.JavaTypes;
import org.apache.openjpa.meta.XMLMetaData;
import org.apache.openjpa.util.ImplHelper;
import org.apache.openjpa.util.UserException;
/**
* A path represents a traversal into fields of a candidate object.
*
* @author Abe White
*/
public class PCPath
extends CandidatePath
implements JDBCPath {
protected static final String TRUE = "1 = 1";
protected static final String FALSE = "1 <> 1";
private static final int PATH = 0;
private static final int BOUND_VAR = 1;
private static final int UNBOUND_VAR = 2;
private static final int UNACCESSED_VAR = 3;
private static final int XPATH = 4;
private static final int OBJECT_PATH = 5;
private static final Localizer _loc = Localizer.forPackage(PCPath.class);
private final ClassMapping _candidate;
private ClassMapping _class = null;
private boolean _key = false;
private int _type = PATH;
private String _varName = null;
private Class _cast = null;
private boolean _cid = false;
private FieldMetaData _xmlfield = null;
private boolean _keyPath = false;
private String _schemaAlias = null;
/**
* Return a path starting with the 'this' ptr.
*/
public PCPath(ClassMapping type) {
_candidate = type;
}
/**
* Return a path starting from the given variable.
*/
public PCPath(ClassMapping candidate, Variable var) {
_candidate = candidate;
_actions = new LinkedList();
PCPath other = var.getPCPath();
Action action = new Action();
action.var = var.getName();
if (other == null) {
_type = UNBOUND_VAR;
action.op = Action.UNBOUND_VAR;
action.data = var;
_schemaAlias = var.getName();
} else {
// bound variable; copy path
_type = UNACCESSED_VAR;
_actions.addAll(other._actions);
_key = other._key;
action.op = Action.VAR;
action.data = var.getName();
_schemaAlias = other._schemaAlias;
_correlationVar = other._correlationVar;
}
_actions.add(action);
_cast = var.getType(); // initial type is var type
}
/**
* Return a path starting from the given subquery.
*/
public PCPath(SubQ sub) {
_candidate = sub.getCandidate();
_actions = new LinkedList();
Action action = new Action();
action.op = Action.SUBQUERY;
action.data = sub.getCandidateAlias();
_actions.add(action);
_cast = sub.getType(); // initial type is subquery type
_varName = sub.getCandidateAlias();
}
public void setSchemaAlias(String schemaAlias) {
if (_schemaAlias == null)
_schemaAlias = schemaAlias;
}
public String getSchemaAlias() {
return _schemaAlias;
}
public void setSubqueryContext(Context context, String correlationVar) {
Action action = lastFieldAction();
if (action == null)
return;
action.context = context;
_correlationVar = correlationVar;
}
/**
* Set the path as a binding of the given variable.
*/
public void addVariableAction(Variable var) {
_varName = var.getName();
}
/**
* Return true if this is a bound variable that has not been accessed
* after binding. Useful for filters like
* "coll.contains (var) && var == null", which should really
* just act like "coll.contains (null)".
*/
public boolean isUnaccessedVariable() {
return _type == UNACCESSED_VAR;
}
/**
* Return whether this is a path involving a variable.
*/
public boolean isVariablePath() {
return _type != PATH;
}
/**
* If this path is part of a contains clause, then alias it to the
* proper contains id before initialization.
*/
public synchronized void setContainsId(String id) {
if (_cid)
return;
Action last = _actions == null ? null : (Action) _actions.getLast();
if (last != null && last.op == Action.VAR && ((String)last.data).equals(last.var)) {
_cid = true;
return;
}
// treat it just like a unique variable
Action action = new Action();
action.op = Action.VAR;
action.data = id;
if (_actions == null)
_actions = new LinkedList();
_actions.add(action);
_cid = true;
}
public ClassMetaData getMetaData() {
return _class;
}
public void setMetaData(ClassMetaData meta) {
_class = (ClassMapping) meta;
}
public boolean isKey() {
return _key;
}
public boolean isXPath() {
return _type == XPATH;
}
public String getXPath() {
StringBuilder xpath = new StringBuilder();
Action action;
Iterator itr = _actions.iterator();
// Skip variable actions since they are not part of the xpath
// until we reach the first xpath action.
// The first xpath action maps to the root of an xml document.
do
action = (Action) itr.next();
while (action.op != Action.GET_XPATH);
// Skip XmlRootElement:
// We can't rely on the accuracy of the name of the root element,
// because it could be set to some default by JAXB XML Binding.
// The caller(DBDictionary) should start with "/*" or "/*/",
// we build the remaining xpath that follows the root element.
while (itr.hasNext()) {
action = (Action) itr.next();
if (((XMLMetaData) action.data).getXmlname() != null)
xpath.append(((XMLMetaData) action.data).getXmlname());
else
xpath.append("*");
if (itr.hasNext())
xpath.append("/");
}
return xpath.toString();
}
public String getPCPathString() {
if (_actions == null)
return (_varName == null) ? "" : _varName + ".";
StringBuilder path = new StringBuilder();
Action action;
for (Iterator itr = _actions.iterator(); itr.hasNext();) {
action = (Action) itr.next();
if (action.op == Action.VAR || action.op == Action.SUBQUERY)
path.append(action.data);
else if (action.op == Action.UNBOUND_VAR)
path.append(((Variable) action.data).getName());
else
path.append(((FieldMapping) action.data).getName());
path.append('.');
}
if (_varName != null)
path.append(_varName).append('.');
return path.toString();
}
public ClassMapping getClassMapping(ExpState state) {
PathExpState pstate = (PathExpState) state;
if (pstate.field == null)
return _class;
if (_key) {
if (pstate.field.getKey().getTypeCode() == JavaTypes.PC)
return pstate.field.getKeyMapping().getTypeMapping();
return null;
}
if (pstate.field.getElement().getTypeCode() == JavaTypes.PC) {
if (pstate.field.isElementCollection() &&
pstate.field.getElement().isEmbedded())
pstate.isEmbedElementColl = true;
return pstate.field.getElementMapping().getTypeMapping();
}
if (pstate.field.getTypeCode() == JavaTypes.PC)
return pstate.field.getTypeMapping();
return null;
}
public FieldMapping getFieldMapping(ExpState state) {
return ((PathExpState) state).field;
}
public Column[] getColumns(ExpState state) {
PathExpState pstate = (PathExpState) state;
if (pstate.cols == null)
pstate.cols = calculateColumns(pstate);
return pstate.cols;
}
/**
* The columns used by this path.
*/
private Column[] calculateColumns(PathExpState pstate) {
if (_key ||
(_keyPath && pstate.field.getKey() != null &&
!pstate.field.getKey().isEmbedded())) {
if (!pstate.joinedRel
&& pstate.field.getKey().getValueMappedBy() != null)
joinRelation(pstate, _key, false, false);
else if (pstate.joinedRel
&& pstate.field.getKey().getTypeCode() == JavaTypes.PC)
return pstate.field.getKeyMapping().getTypeMapping().
getPrimaryKeyColumns();
return pstate.field.getKeyMapping().getColumns();
}
if (pstate.field != null) {
switch (pstate.field.getTypeCode()) {
case JavaTypes.MAP:
case JavaTypes.ARRAY:
case JavaTypes.COLLECTION:
ValueMapping elem = pstate.field.getElementMapping();
if (pstate.field.isElementCollection() && pstate.field.getElement().isEmbedded()) {
Strategy strategy = pstate.field.getStrategy();
if (strategy instanceof HandlerCollectionTableFieldStrategy) {
return ((HandlerCollectionTableFieldStrategy) strategy).
getElementColumns(elem.getTypeMapping());
} else if (strategy instanceof HandlerHandlerMapTableFieldStrategy) {
return ((HandlerHandlerMapTableFieldStrategy) strategy).
getValueColumns(elem.getTypeMapping());
}
}
if (pstate.joinedRel && elem.getTypeCode() == JavaTypes.PC)
return elem.getTypeMapping().getPrimaryKeyColumns();
if (elem.getColumns().length > 0)
return elem.getColumns();
return pstate.field.getColumns();
case JavaTypes.PC:
if (pstate.joinedRel)
return pstate.field.getTypeMapping().
getPrimaryKeyColumns();
return pstate.field.getColumns();
default:
return pstate.field.getColumns();
}
}
return (_class == null) ? Schemas.EMPTY_COLUMNS
: _class.getPrimaryKeyColumns();
}
public boolean isVariable() {
if (_actions == null)
return false;
Action action = (Action) _actions.getLast();
return action.op == Action.UNBOUND_VAR || action.op == Action.VAR;
}
public void get(FieldMetaData field, boolean nullTraversal) {
if (_actions == null)
_actions = new LinkedList();
Action action = new Action();
action.op = (nullTraversal) ? Action.GET_OUTER : Action.GET;
action.data = field;
_actions.add(action);
if (_type == UNACCESSED_VAR)
_type = BOUND_VAR;
_cast = null;
_key = false;
}
public void get(FieldMetaData fmd, XMLMetaData meta) {
if (_actions == null)
_actions = new LinkedList();
Action action = new Action();
action.op = Action.GET_XPATH;
action.data = meta;
_actions.add(action);
_cast = null;
_key = false;
_type = XPATH;
_xmlfield = fmd;
}
public void get(XMLMetaData meta, String name) {
Action action = new Action();
action.op = Action.GET_XPATH;
action.data = meta.getFieldMapping(name);
_actions.add(action);
_cast = null;
_key = false;
_type = XPATH;
}
public XMLMetaData getXmlMapping() {
Action act = (Action) _actions.getLast();
if (act != null)
return (XMLMetaData) act.data;
return null;
}
public synchronized void getKey() {
if (_cid)
return;
// replace the last field action to a get key
Action action = lastFieldAction();
Action key = new Action();
key.op = Action.GET_KEY;
key.data = action.data;
int pos = _actions.indexOf(action);
_actions.remove(action);
_actions.add(pos, key);
_cast = null;
_key = true;
_type = PATH;
}
private void checkObjectPathInheritanceTypeJoined(PathExpState pstate) {
// if this mapping is in InheritanceType.JOINED,
// then add joins
ClassMapping base = _class;
while (base.getJoinablePCSuperclassMapping() != null)
base = base.getJoinablePCSuperclassMapping();
if (base != _class) {
ClassMapping from = _class;
ClassMapping to = base;
_type = OBJECT_PATH;
for (; from != null && from != to; from = from.getJoinablePCSuperclassMapping()) {
pstate.joins = from.joinSuperclass(pstate.joins, false);
}
}
}
public FieldMetaData last() {
Action act = lastFieldAction();
return (act == null) ? null : isXPath() ?
_xmlfield : (FieldMetaData) act.data;
}
/**
* Return the last action that gets a field.
*/
private Action lastFieldAction() {
if (_actions == null)
return null;
if (isXPath())
return (Action) _actions.getLast();
ListIterator itr = _actions.listIterator(_actions.size());
Action prev;
while (itr.hasPrevious()) {
prev = (Action) itr.previous();
if (prev.op == Action.GET || prev.op == Action.GET_OUTER
|| prev.op == Action.GET_KEY)
return prev;
}
return null;
}
public Class getType() {
if (_cast != null)
return _cast;
Action act = lastFieldAction();
if (act != null && act.op == Action.GET_XPATH)
return ((XMLMetaData) act.data).getType();
FieldMetaData fld = (act == null) ? null : (FieldMetaData) act.data;
boolean key = act != null && act.op == Action.GET_KEY;
if (fld != null) {
switch (fld.getDeclaredTypeCode()) {
case JavaTypes.ARRAY:
if (fld.getDeclaredType() == byte[].class
|| fld.getDeclaredType() == Byte[].class
|| fld.getDeclaredType() == char[].class
|| fld.getDeclaredType() == Character[].class)
return fld.getDeclaredType();
return fld.getElement().getDeclaredType();
case JavaTypes.MAP:
if (key)
return fld.getKey().getDeclaredType();
return fld.getElement().getDeclaredType();
case JavaTypes.COLLECTION:
return fld.getElement().getDeclaredType();
default:
return fld.getDeclaredType();
}
}
if (_class != null)
return _class.getDescribedType();
return Object.class;
}
public void setImplicitType(Class type) {
_cast = type;
}
public ExpState initialize(Select sel, ExpContext ctx, int flags) {
PathExpState pstate = new PathExpState(sel.newJoins());
boolean key = false;
boolean forceOuter = false;
ClassMapping rel = _candidate;
sel.setSchemaAlias(_schemaAlias);
// iterate to the final field
ClassMapping owner;
ClassMapping from, to;
Action action;
Variable var;
Iterator itr = (_actions == null) ? null : _actions.iterator();
FieldMapping field = null;
Action prevaction = null;
boolean isCorrelatedPath = false;
boolean fromParentRootInSubselect = navigateFromParentRootInSubselect(sel);
while (itr != null && itr.hasNext()) {
action = (Action) itr.next();
// treat subqueries like variables for alias generation purposes
if (action.op == Action.VAR) {
if (sel.getParent() != null && action.var != null &&
prevaction != null && prevaction.data != null &&
sel.ctx().getVariable(action.var) == null) {
isCorrelatedPath = true;
pstate.joins = pstate.joins.setCorrelatedVariable(action.var);
} else
pstate.joins = pstate.joins.setVariable((String) action.data);
}
else if (action.op == Action.SUBQUERY) {
pstate.joins = pstate.joins.setSubselect((String) action.data);
}
else if (action.op == Action.UNBOUND_VAR) {
// unbound vars are cross-joined to the candidate table
var = (Variable) action.data;
rel = (ClassMapping) var.getMetaData();
if (rel == null)
throw new IllegalArgumentException(_loc.get(
"invalid-unbound-var", var.getName()).toString());
if (sel.getParent() != null && action.var != null &&
sel.ctx().getVariable(action.var) == null) {
//System.out.println("Correlated action var="+action.var);
isCorrelatedPath = true;
pstate.joins = pstate.joins.setCorrelatedVariable(var.getName());
} else
pstate.joins = pstate.joins.setVariable(var.getName());
pstate.joins = pstate.joins.crossJoin(_candidate.getTable(),
rel.getTable());
if (!itr.hasNext() && isVariable()) {
checkObjectPathInheritanceTypeJoined(pstate);
}
} else {
// move past the previous field, if any
field = (FieldMapping) ((action.op == Action.GET_XPATH) ?
_xmlfield : action.data);
if (pstate.field != null) {
// if this is the second-to-last field and the last is
// the related field this field joins to, no need to
// traverse: just use this field's fk columns
if (!itr.hasNext() && (flags & JOIN_REL) == 0
&& isJoinedField(pstate.field, key, field)) {
pstate.cmpfield = field;
break;
}
if (fromParentRootInSubselect) {
isCorrelatedPath = true;
pstate.joins = pstate.joins.setCorrelatedVariable(_schemaAlias);
pstate.joins.setJoinContext(null);
}
rel = traverseField(pstate, key, forceOuter ||
ctx.store.getDBDictionary().fullResultCollectionInOrderByRelation, false);
}
// mark if the next traversal should go through
// the key rather than value
key = action.op == Action.GET_KEY;
forceOuter |= action.op == Action.GET_OUTER;
if (key && itr.hasNext())
_keyPath = true;
// get mapping for the current field
pstate.field = field;
owner = pstate.field.getDefiningMapping();
if (pstate.field.getManagement()
!= FieldMapping.MANAGE_PERSISTENT)
throw new UserException(_loc.get("non-pers-field",
pstate.field));
// find the most-derived type between the declared relation
// type and the field's owner, and join from that type to
// the lesser derived type
if (rel != owner && rel != null) {
if (rel.getDescribedType().isAssignableFrom
(owner.getDescribedType())) {
from = owner;
to = rel;
} else {
from = rel;
to = owner;
}
for (; from != null && from != to;
from = from.getJoinablePCSuperclassMapping()) {
FieldMapping cast = from.getFieldMapping(pstate.field
.getName());
if (cast != null)
pstate.field = cast;
pstate.joins = from.joinSuperclass(pstate.joins, false);
}
}
// nothing more to do from here on as we encountered an xpath
// action
if (action.op == Action.GET_XPATH)
break;
}
prevaction = action;
if (prevaction != null && prevaction.context != null) {
Context jCtx = JDBCStoreQuery.getThreadLocalContext(prevaction.context);
pstate.joins = pstate.joins.setJoinContext(jCtx);
}
}
if (_varName != null)
pstate.joins = pstate.joins.setVariable(_varName);
// if we're not comparing to null or doing an isEmpty, then
// join into the data on the final field; obviously we can't do these
// joins when comparing to null b/c the whole purpose is to see
// whether the joins even exist
if ((flags & NULL_CMP) == 0)
traverseField(pstate, key, forceOuter, true);
pstate.joinedRel = false;
if ((flags & JOIN_REL) != 0)
joinRelation(pstate, key, forceOuter || (flags & FORCE_OUTER) != 0,
false);
if (isCorrelatedPath) {
// check if there are joins that belong to parent
pstate.joins.moveJoinsToParent();
}
pstate.joins.setJoinContext(null);
if (_actions == null) {
String subqAlias = findSubqAlias(sel);
pstate.joins = pstate.joins.setSubselect(subqAlias);
pstate.joins.setCorrelatedVariable(_schemaAlias);
checkObjectPathInheritanceTypeJoined(pstate);
}
return pstate;
}
private String findSubqAlias(Select sel) {
Select pSel = sel.getParent();
if (pSel == null)
return null;
Context pCtx = pSel.ctx();
if (pCtx.subquery == null)
return null;
if (pCtx.getSchema(_schemaAlias) != null)
return ((SubQ)pCtx.subquery).getCandidateAlias();
return findSubqAlias(pSel);
}
/**
* When a PCPath is in subselect, and it is simply a navigation
* from the parent root, the joins involved in this PCPath
* must happen in the main select.
*/
private boolean navigateFromParentRootInSubselect(Select sel) {
if (sel.getParent() == null)
return false;
Iterator itr = (_actions == null) ? null : _actions.iterator();
boolean hasVar = false;
boolean startsWithSubquery = false;
while (itr != null && itr.hasNext()) {
Action action = (Action) itr.next();
if (action.op == Action.VAR)
hasVar = true;
else if (action.op == Action.SUBQUERY)
startsWithSubquery = true;
}
return !hasVar && !startsWithSubquery && sel.ctx().getSchema(_schemaAlias) == null;
}
/**
* Return whether the given source field joins to the given target field.
*/
private static boolean isJoinedField(FieldMapping src, boolean key,
FieldMapping target) {
ValueMapping vm;
switch (src.getTypeCode()) {
case JavaTypes.ARRAY:
case JavaTypes.COLLECTION:
vm = src.getElementMapping();
break;
case JavaTypes.MAP:
vm = (key) ? src.getKeyMapping() : src.getElementMapping();
break;
default:
vm = src;
}
if (vm.getJoinDirection() != ValueMapping.JOIN_FORWARD)
return false;
ForeignKey fk = vm.getForeignKey();
if (fk == null)
return false;
// foreign key must join to target columns
Column[] rels = fk.getColumns();
Column[] pks = target.getColumns();
if (rels.length != pks.length)
return false;
for (int i = 0; i < rels.length; i++)
if (fk.getPrimaryKeyColumn(rels[i]) != pks[i])
return false;
return true;
}
protected Object eval(Object candidate, Object orig,
StoreContext ctx, Object[] params) {
if (_actions == null)
return candidate;
Action action;
OpenJPAStateManager sm;
Broker tmpBroker;
for (Iterator itr = _actions.iterator(); itr.hasNext();) {
action = (Action)itr.next();
sm = null;
tmpBroker = null;
if (ImplHelper.isManageable(candidate))
sm = (OpenJPAStateManager) (ImplHelper.toPersistenceCapable(
candidate, ctx.getConfiguration())).
pcGetStateManager();
if (sm == null) {
tmpBroker = ctx.getBroker();
tmpBroker.transactional(candidate, false, null);
sm = tmpBroker.getStateManager(candidate);
}
if (action.op != Action.GET && action.op != Action.GET_OUTER)
continue;
try {
candidate = sm.fetchField(
((FieldMapping)action.data).getIndex(), true);
} catch (ClassCastException cce) {
throw new RuntimeException(action.data + " not a field path");
} finally {
// transactional does not clear the state, which is
// important since tmpCandidate might be also managed by
// another broker if it's a proxied non-pc instance
if (tmpBroker != null)
tmpBroker.nontransactional(sm.getManagedInstance(), null);
}
}
return candidate;
}
/**
* Expression state.
*/
public static class PathExpState
extends ExpState {
public FieldMapping field = null;
public FieldMapping cmpfield = null;
public Column[] cols = null;
public boolean joinedRel = false;
public boolean isEmbedElementColl = false;
public PathExpState(Joins joins) {
super(joins);
}
}
/**
* Traverse into the previous field of a relation path.
*
* @param last whether this is the last field in the path
* @return the mapping of the related type, or null
*/
private ClassMapping traverseField(PathExpState pstate, boolean key,
boolean forceOuter, boolean last) {
if (pstate.field == null)
return null;
// traverse into field value
if (key)
pstate.joins = pstate.field.joinKey(pstate.joins, forceOuter);
else
pstate.joins = pstate.field.join(pstate.joins, forceOuter);
// if this isn't the last field, traverse into the relation
if (!last)
joinRelation(pstate, key, forceOuter, true);
// return the maping of the related type, if any
if (key)
return pstate.field.getKeyMapping().getTypeMapping();
if (pstate.field.getElement().getTypeCode() == JavaTypes.PC)
return pstate.field.getElementMapping().getTypeMapping();
return pstate.field.getTypeMapping();
}
/**
* Join into the relation represented by the current field, if any.
*/
private void joinRelation(PathExpState pstate, boolean key,
boolean forceOuter, boolean traverse) {
if (pstate.field == null)
return;
if (key)
pstate.joins = pstate.field.joinKeyRelation(pstate.joins,
forceOuter, traverse);
else
pstate.joins = pstate.field.joinRelation(pstate.joins, forceOuter,
traverse);
pstate.joinedRel = true;
}
public Object toDataStoreValue(Select sel, ExpContext ctx, ExpState state,
Object val) {
PathExpState pstate = (PathExpState) state;
FieldMapping field = (pstate.cmpfield != null) ? pstate.cmpfield
: pstate.field;
if (isXPath())
return val;
if (field != null) {
if (_key)
return field.toKeyDataStoreValue(val, ctx.store);
if (field.getElement().getDeclaredTypeCode() != JavaTypes.OBJECT)
return field.toDataStoreValue(val, ctx.store);
val = field.getExternalValue(val, ctx.store.getContext());
return field.toDataStoreValue(val, ctx.store);
}
return _class.toDataStoreValue(val, _class.getPrimaryKeyColumns(),
ctx.store);
}
public void select(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
selectColumns(sel, ctx, state, pks);
}
public void selectColumns(Select sel, ExpContext ctx, ExpState state,
boolean pks) {
sel.setSchemaAlias(_schemaAlias);
ClassMapping mapping = getClassMapping(state);
PathExpState pstate = (PathExpState) state;
if (_type != OBJECT_PATH && (mapping == null || !pstate.joinedRel ||
pstate.isEmbedElementColl))
sel.select(getColumns(state), pstate.joins);
else if (_key && pstate.field.getKey().isEmbedded())
selectEmbeddedMapKey(sel, ctx, state);
else if (pks)
sel.select(mapping.getPrimaryKeyColumns(), pstate.joins);
else {
// select the mapping; allow any subs because we know this must
// be either a relation, in which case it will already be
// constrained by the joins, or 'this', in which case the
// JDBCExpressionFactory takes care of adding class conditions for
// the candidate class on the select
int subs = (_type == UNBOUND_VAR) ? Select.SUBS_JOINABLE
: Select.SUBS_ANY_JOINABLE;
sel.select(mapping, subs, ctx.store, ctx.fetch,
JDBCFetchConfiguration.EAGER_NONE, sel.outer(pstate.joins));
}
}
public void groupBy(Select sel, ExpContext ctx, ExpState state) {
ClassMapping mapping = getClassMapping(state);
PathExpState pstate = (PathExpState) state;
if (mapping == null || !pstate.joinedRel)
sel.groupBy(getColumns(state), sel.outer(pstate.joins));
else {
int subs = (_type == UNBOUND_VAR) ? Select.SUBS_JOINABLE
: Select.SUBS_ANY_JOINABLE;
sel.groupBy(mapping, subs, ctx.store, ctx.fetch,
sel.outer(pstate.joins));
}
}
public void orderBy(Select sel, ExpContext ctx, ExpState state,
boolean asc) {
sel.orderBy(getColumns(state), asc, sel.outer(state.joins), false);
}
public Object load(ExpContext ctx, ExpState state, Result res)
throws SQLException {
return load(ctx, state, res, false);
}
Object load(ExpContext ctx, ExpState state, Result res, boolean pks)
throws SQLException {
ClassMapping mapping = getClassMapping(state);
PathExpState pstate = (PathExpState) state;
if (mapping != null && (pstate.field == null
|| !pstate.field.isEmbedded())) {
if (pks)
return mapping.getObjectId(ctx.store, res, null, true,
pstate.joins);
if (_key && pstate.field.getKey().isEmbedded())
return loadEmbeddedMapKey(ctx, state, res);
if (pstate.isEmbedElementColl)
return pstate.field.loadProjection(ctx.store, ctx.fetch, res,
pstate.joins);
return res.load(mapping, ctx.store, ctx.fetch, pstate.joins);
}
Object ret;
if (_key) {
// Map key is a java primitive type
// example: Map emps
ret = res.getObject(pstate.cols[0], null, pstate.joins);
} else {
ret = pstate.field.loadProjection(ctx.store, ctx.fetch, res, pstate.joins);
}
if (pstate.field.isExternalized()) {
ret = pstate.field.getFieldValue(ret, ctx.store.getContext());
}
if (_cast != null)
ret = Filters.convert(ret, _cast);
return ret;
}
private void validateMapStrategy(Strategy strategy) {
if (strategy == null ||
!(strategy instanceof LRSMapFieldStrategy))
throw new RuntimeException("Invalid map field strategy:"+strategy);
}
private void selectEmbeddedMapKey(Select sel, ExpContext ctx,
ExpState state) {
PathExpState pstate = (PathExpState) state;
validateMapStrategy(pstate.field.getStrategy());
LRSMapFieldStrategy strategy = (LRSMapFieldStrategy)
pstate.field.getStrategy();
ClassMapping mapping = pstate.field.getKeyMapping().getTypeMapping();
strategy.selectKey(sel, mapping, null, ctx.store, ctx.fetch,
pstate.joins);
}
private Object loadEmbeddedMapKey(ExpContext ctx, ExpState state,
Result res) throws SQLException {
PathExpState pstate = (PathExpState) state;
validateMapStrategy(pstate.field.getStrategy());
LRSMapFieldStrategy strategy =
(LRSMapFieldStrategy) pstate.field.getStrategy();
return strategy.loadKey(null, ctx.store, ctx.fetch, res,
pstate.joins);
}
public void calculateValue(Select sel, ExpContext ctx, ExpState state,
Val other, ExpState otherState) {
// we don't create the SQL b/c it forces the Select to cache aliases
// for the tables we use, and these aliases might not ever be used if
// we eventually call appendIsEmpty or appendIsNull rather than appendTo
}
public void verifyIndexedField() {
Action lastAction = (Action) lastFieldAction();
FieldMapping fm = (FieldMapping) lastAction.data;
if (fm.getOrderColumn() == null)
throw new UserException(_loc.get("no-order-column", fm.getName()));
}
public int length(Select sel, ExpContext ctx, ExpState state) {
return getColumns(state).length;
}
public void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
Column[] cols = getColumns(state);
for (int i = 0; i < cols.length; i++) {
appendTo(sel, state, sql, cols[i]);
if (i < cols.length -1)
sql.append(", ");
}
}
public void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql, int index) {
Column col = getColumns(state)[index];
appendTo(sel, state, sql, col);
}
public void appendTo(Select sel, ExpState state, SQLBuffer sql, Column col) {
if (sel != null)
sel.setSchemaAlias(_schemaAlias);
// if select is null, it means we are not aliasing columns
// (e.g., during a bulk update)
if (sel == null)
sql.append(col.getIdentifier());
else if (_type == XPATH)
// if this is an xpath, append xpath string
sql.append(getXPath());
else
sql.append(sel.getColumnAlias(col, state.joins));
}
public void appendIsEmpty(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
PathExpState pstate = (PathExpState) state;
if (pstate.field == null)
sql.append(FALSE);
else
pstate.field.appendIsEmpty(sql, sel, pstate.joins);
}
public void appendIsNotEmpty(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
PathExpState pstate = (PathExpState) state;
if (pstate.field == null)
sql.append(FALSE);
else
pstate.field.appendIsNotEmpty(sql, sel, pstate.joins);
}
public void appendIndex(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
PathExpState pstate = (PathExpState) state;
if (pstate.field == null)
sql.append("1");
else
pstate.field.appendIndex(sql, sel, pstate.joins);
}
public void appendType(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
Discriminator disc = null;
ClassMapping sup = _class;
while (sup.getMappedPCSuperclassMapping() != null)
sup = sup.getMappedPCSuperclassMapping();
disc = sup.getDiscriminator();
Column[] cols = null;
if (disc != null)
cols = disc.getColumns();
else
cols = getColumns(state);
if (cols == null || cols.length == 0) {
sql.append("1");
return;
}
for (int i = 0; i < cols.length; i++) {
if (i > 0)
sql.append(", ");
sql.append(sel.getColumnAlias(cols[i], state.joins));
}
}
public void appendSize(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
PathExpState pstate = (PathExpState) state;
if (pstate.field == null)
sql.append("1");
else
pstate.field.appendSize(sql, sel, pstate.joins);
}
public void appendIsNull(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
PathExpState pstate = (PathExpState) state;
if (pstate.field == null)
sql.append(FALSE);
else
pstate.field.appendIsNull(sql, sel, pstate.joins);
}
public void appendIsNotNull(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql) {
PathExpState pstate = (PathExpState) state;
if (pstate.field == null)
sql.append(TRUE);
else
pstate.field.appendIsNotNull(sql, sel, pstate.joins);
}
public boolean isSubqueryPath() {
if (_actions != null && _actions.size() == 1 &&
((Action)_actions.get(0)).op == Action.SUBQUERY)
return true;
return false;
}
public int hashCode() {
if (_actions == null)
return _candidate.hashCode();
return _candidate.hashCode() ^ _actions.hashCode();
}
public boolean equals(Object other) {
if (other == this)
return true;
if (!(other instanceof PCPath))
return false;
PCPath path = (PCPath) other;
return ObjectUtils.equals(_candidate, path._candidate)
&& ObjectUtils.equals(_actions, path._actions);
}
public int getId() {
return Val.VAL;
}
/**
* Helper class representing an action.
*/
private static class Action
implements Serializable {
public static final int GET = 0;
public static final int GET_OUTER = 1;
public static final int GET_KEY = 2;
public static final int VAR = 3;
public static final int SUBQUERY = 4;
public static final int UNBOUND_VAR = 5;
public static final int CAST = 6;
public static final int GET_XPATH = 7;
public int op = -1;
public Object data = null;
public String var = null;
public Context context = null;
public String toString() {
return op + "|" + data;
}
public int hashCode() {
if (data == null)
return op;
return op ^ data.hashCode();
}
public boolean equals(Object other) {
if (other == null)
return false;
if (other == this)
return true;
Action a = (Action) other;
return op == a.op
&& ObjectUtils.equals(data, a.data);
}
}
}
