org.apache.openjpa.jdbc.kernel.ProjectionResultObjectProvider Maven / Gradle / Ivy
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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
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*/
package org.apache.openjpa.jdbc.kernel;
import org.apache.openjpa.jdbc.kernel.exps.ExpContext;
import org.apache.openjpa.jdbc.kernel.exps.QueryExpressionsState;
import org.apache.openjpa.jdbc.kernel.exps.Val;
import org.apache.openjpa.jdbc.sql.Result;
import org.apache.openjpa.jdbc.sql.SelectExecutor;
import org.apache.openjpa.kernel.exps.QueryExpressions;
/**
* Object provider implementation wrapped around a projection select.
*
* @author Abe White
*/
class ProjectionResultObjectProvider
extends SelectResultObjectProvider {
private final QueryExpressions[] _exps;
private final QueryExpressionsState[] _state;
private final ExpContext _ctx;
/**
* Constructor.
*
* @param sel the select to execute
* @param exps the query expressions
* @param states the query expression states
* @param ctx the query execution context
*/
public ProjectionResultObjectProvider(SelectExecutor sel,
QueryExpressions exps, QueryExpressionsState state, ExpContext ctx) {
this(sel, new QueryExpressions[]{ exps },
new QueryExpressionsState[]{ state }, ctx);
}
/**
* Constructor.
*
* @param sel the select to execute
* @param exps the query expressions
* @param states the query expression states
* @param ctx the query execution context
*/
public ProjectionResultObjectProvider(SelectExecutor sel,
QueryExpressions[] exps, QueryExpressionsState[] state, ExpContext ctx){
super(sel, ctx.store, ctx.fetch);
_exps = exps;
_state = state;
_ctx = ctx;
}
public Object getResultObject()
throws Exception {
Result res = getResult();
// for a projection, Result has no base mapping
res.setBaseMapping(null);
int idx = res.indexOf();
Object[] arr = new Object[_exps[idx].projections.length];
for (int i = 0; i < _exps[idx].projections.length; i++)
arr[i] = ((Val) _exps[idx].projections[i]).load(_ctx,
_state[idx].projections[i], res);
return arr;
}
}