com.blazebit.persistence.impl.keyset.LazyKeysetLink Maven / Gradle / Ivy
/*
* Copyright 2014 - 2019 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.keyset;
import java.io.Serializable;
import java.util.List;
import java.util.Map;
import com.blazebit.persistence.Keyset;
import com.blazebit.persistence.impl.OrderByExpression;
/**
*
* @author Christian Beikov
* @since 1.0.0
*/
public class LazyKeysetLink extends AbstractKeysetLink {
private final Map keysetValues;
private Keyset keyset;
public LazyKeysetLink(Map keysetValues, KeysetMode keysetMode) {
super(keysetMode);
this.keysetValues = keysetValues;
}
@Override
public void initialize(List orderByExpressions) {
Serializable[] tuple = new Serializable[orderByExpressions.size()];
for (int i = 0; i < tuple.length; i++) {
String expressionString = orderByExpressions.get(0).getExpression().toString();
Object value = keysetValues.get(expressionString);
if (value == null) {
if (!keysetValues.containsKey(expressionString)) {
throw new IllegalArgumentException("The keyset provided [" + keysetValues
+ "] does not contain an entry for the order by expression: " + expressionString);
}
tuple[i] = null;
} else {
if (!(value instanceof Serializable)) {
throw new IllegalArgumentException("The keyset value [" + value + "] provided for the order by expression [" + expressionString
+ "] is not an instance of java.io.Serializable!");
}
tuple[i] = (Serializable) value;
}
}
keyset = new KeysetImpl(tuple);
validate(keyset, orderByExpressions);
}
@Override
public Keyset getKeyset() {
return keyset;
}
}