org.apache.openjpa.persistence.jdbc.FetchMode Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* 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
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*/
package org.apache.openjpa.persistence.jdbc;
import org.apache.openjpa.jdbc.kernel.EagerFetchModes;
import org.apache.openjpa.kernel.FetchConfiguration;
import org.apache.openjpa.persistence.OpenJPAEnum;
/**
* Type of fetching to employ.
*
* @author Abe White
* @since 0.4.0
* @published
*/
public enum FetchMode implements OpenJPAEnum{
NONE(EagerFetchModes.EAGER_NONE, "none"),
JOIN(EagerFetchModes.EAGER_JOIN, "join"),
PARALLEL(EagerFetchModes.EAGER_PARALLEL, "parallel");
private final int eagerFetchConstant;
private final String[] _names;
private FetchMode(int value, String... names) {
eagerFetchConstant = value;
_names = names;
}
public int toKernelConstant() {
return eagerFetchConstant;
}
static FetchMode fromKernelConstant(int kernelConstant) {
switch (kernelConstant) {
case EagerFetchModes.EAGER_NONE:
return NONE;
case EagerFetchModes.EAGER_JOIN:
return JOIN;
case EagerFetchModes.EAGER_PARALLEL:
return PARALLEL;
default:
throw new IllegalArgumentException(kernelConstant + "");
}
}
public int convertToKernelConstant(String s) {
return FetchMode.toKernelConstantFromString(s);
}
public int convertToKernelConstant(int i) {
if (i == FetchConfiguration.DEFAULT)
return i;
for (FetchMode mode : FetchMode.values()) {
if (mode.eagerFetchConstant == i)
return i;
}
throw new IllegalArgumentException(i + " is invalid value for FetchMode");
}
public static int toKernelConstantFromString(String s) {
for (FetchMode level : FetchMode.values()) {
for (String name : level._names)
if (name.equalsIgnoreCase(s) || String.valueOf(level.toKernelConstant()).equals(s))
return level.toKernelConstant();
}
throw new IllegalArgumentException(s + " is not a valid name for " + FetchMode.class.getName());
}
}