com.blazebit.persistence.impl.builder.object.TupleObjectBuilder Maven / Gradle / Ivy
/*
* Copyright 2014 - 2020 Blazebit.
*
* Licensed 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 com.blazebit.persistence.impl.builder.object;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import javax.persistence.Tuple;
import javax.persistence.TupleElement;
import com.blazebit.persistence.ObjectBuilder;
import com.blazebit.persistence.SelectBuilder;
import com.blazebit.persistence.impl.SelectInfo;
/**
*
* @author Christian Beikov
* @author Moritz Becker
* @since 1.0.0
*/
public class TupleObjectBuilder implements ObjectBuilder {
private final Map selectAliasToPositionMap;
private String[] aliases;
public TupleObjectBuilder(List selectInfos, Map selectAliasToPositionMap) {
aliases = new String[selectInfos.size()];
for (int i = 0; i < aliases.length; i++) {
aliases[i] = selectInfos.get(i).getAlias();
}
this.selectAliasToPositionMap = selectAliasToPositionMap;
}
@Override
public Tuple build(Object[] tuple) {
return new TupleImpl(tuple);
}
@Override
public List buildList(List list) {
return list;
}
@Override
public > void applySelects(X queryBuilder) {
}
private String[] getSelectAliases() {
return aliases;
}
/**
* @author Christian Beikov
* @since 1.0.0
*/
private class TupleImpl implements Tuple {
private final Object[] tuple;
private List> tupleElements;
private TupleImpl(Object[] tuple) {
this.tuple = tuple;
}
@Override
public X get(TupleElement tupleElement) {
return get(tupleElement.getAlias(), tupleElement.getJavaType());
}
@Override
public Object get(String alias) {
Integer index = null;
if (alias != null) {
alias = alias.trim();
if (alias.length() > 0) {
index = selectAliasToPositionMap.get(alias);
}
}
if (index == null) {
throw new IllegalArgumentException("Given alias [" + alias + "] did not correspond to an element in the result tuple");
}
// index should be "in range" by nature of size check in ctor
return tuple[index];
}
@Override
public X get(String alias, Class type) {
return type.cast(get(alias));
}
@Override
public Object get(int i) {
if (i >= tuple.length || i < 0) {
throw new IllegalArgumentException("Given index [" + i + "] was outside the range of result tuple size [" + tuple.length + "] ");
}
return tuple[i];
}
@Override
public X get(int i, Class type) {
return type.cast(get(i));
}
@Override
public Object[] toArray() {
return tuple.clone();
}
@Override
public List> getElements() {
if (tupleElements == null) {
if (aliases == null) {
aliases = getSelectAliases();
}
tupleElements = new ArrayList>(tuple.length);
for (int i = 0; i < tuple.length; i++) {
tupleElements.add(new TupleElementImpl