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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.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import org.apache.openjpa.jdbc.meta.ClassMapping;
import org.apache.openjpa.jdbc.meta.Discriminator;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.Filters;
import org.apache.openjpa.kernel.exps.Parameter;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.util.ImplHelper;
/**
* A collection-valued input parameter in an in-expression.
*
* @author Catalina Wei
*/
public class CollectionParam
extends Const
implements Parameter {
private static final Localizer _loc = Localizer.forPackage(
CollectionParam.class);
private final Object _key;
private Class _type = null;
private int _idx = -1;
private boolean _container = false;
/**
* Constructor. Supply parameter name and type.
*/
public CollectionParam(Object key, Class type) {
_key = key;
setImplicitType(type);
}
public CollectionParam clone() {
CollectionParam c = new CollectionParam(this._key, this._type);
c._idx = this._idx;
c._container = this._container;
return c;
}
public Object getParameterKey() {
return _key;
}
public Class getType() {
return _type;
}
public void setImplicitType(Class type) {
_type = type;
_container = (getMetaData() == null || !ImplHelper.isManagedType(
getMetaData().getRepository().getConfiguration(), type))
&& (Collection.class.isAssignableFrom(type)
|| Map.class.isAssignableFrom(type));
}
public int getIndex() {
return _idx;
}
public void setIndex(int idx) {
_idx = idx;
}
public Object getValue(Object[] params) {
return Filters.convert(params[_idx], getType());
}
public Object getValue(ExpContext ctx, ExpState state) {
ParamExpState pstate = (ParamExpState) state;
if (pstate.discValue[0] != null)
return Arrays.asList(pstate.discValue);
else
return getValue(ctx.params);
}
public Object getSQLValue(Select sel, ExpContext ctx, ExpState state) {
return ((ParamExpState) state).sqlValue;
}
public ExpState initialize(Select sel, ExpContext ctx, int flags) {
return new ParamExpState(ctx.params[_idx]);
}
/**
* Expression state.
*/
public static class ParamExpState
extends ConstExpState {
public int size = 0;
public Object[] sqlValue = null;
public int[] otherLength;
public ClassMapping[] mapping = null;
public Discriminator[] disc = null;
public Object discValue[] = null;
ParamExpState(Object params) {
if (params instanceof Collection)
size = ((Collection) params).size();
sqlValue = new Object[size];
otherLength = new int[size];
mapping = new ClassMapping[size];
disc = new Discriminator[size];
discValue = new Object[size];
for (int i = 0; i < size; i++) {
sqlValue[i] = null;
otherLength[i] = 1;
mapping[i] = null;
disc[i] = null;
discValue[i] = null;
}
}
}
public void calculateValue(Select sel, ExpContext ctx, ExpState state,
Val other, ExpState otherState) {
super.calculateValue(sel, ctx, state, other, otherState);
ParamExpState pstate = (ParamExpState) state;
Object value = getValue(ctx.params);
if (!(value instanceof Collection))
throw new IllegalArgumentException(_loc.get(
"not-collection-parm", _key).toString());
if (((Collection) value).isEmpty())
throw new IllegalArgumentException(_loc.get(
"empty-collection-parm", _key).toString());
Iterator itr = ((Collection) value).iterator();
for (int i = 0; i < pstate.size && itr.hasNext(); i++) {
Object val = itr.next();
if (other != null && !_container) {
pstate.sqlValue[i] = other.toDataStoreValue(sel, ctx,
otherState, val);
pstate.otherLength[i] = other.length(sel, ctx, otherState);
if (other instanceof Type) {
pstate.mapping[i] = ctx.store.getConfiguration().
getMappingRepositoryInstance().getMapping((Class) val,
ctx.store.getContext().getClassLoader(), true);
pstate.disc[i] = pstate.mapping[i].getDiscriminator();
pstate.discValue[i] = pstate.disc[i] != null ?
pstate.disc[i].getValue() : null;
}
} else if (ImplHelper.isManageable(val)) {
ClassMapping mapping = ctx.store.getConfiguration().
getMappingRepositoryInstance().getMapping(val.getClass(),
ctx.store.getContext().getClassLoader(), true);
pstate.sqlValue[i] = mapping.toDataStoreValue(val,
mapping.getPrimaryKeyColumns(), ctx.store);
pstate.otherLength[i] = mapping.getPrimaryKeyColumns().length;
} else
pstate.sqlValue[i] = val;
}
}
public void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql, int index) {
ParamExpState pstate = (ParamExpState) state;
for (int i = 0; i < pstate.size; i++) {
if (pstate.otherLength[i] > 1)
sql.appendValue(((Object[]) pstate.sqlValue[i])[index],
pstate.getColumn(index), this);
else if (pstate.cols != null)
sql.appendValue(pstate.sqlValue[i], pstate.getColumn(index),
this);
else if (pstate.discValue[i] != null)
sql.appendValue(pstate.discValue[i]);
else
sql.appendValue(pstate.sqlValue[i], pstate.getColumn(index),
this);
}
}
}
