com.blazebit.persistence.impl.DefaultOrderByElement Maven / Gradle / Ivy
/*
* Copyright 2014 - 2023 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;
import com.blazebit.persistence.spi.OrderByElement;
/**
* @author Christian Beikov
* @since 1.2.0
*/
public class DefaultOrderByElement implements OrderByElement {
private final String name;
private final int position;
private final boolean ascending;
private final boolean nullable;
private final boolean nullsFirst;
public DefaultOrderByElement(String name, int position, boolean ascending, boolean nullable, boolean nullsFirst) {
this.name = name;
this.position = position;
this.ascending = ascending;
this.nullable = nullable;
this.nullsFirst = nullsFirst;
}
public String getName() {
return name;
}
@Override
public int getPosition() {
return position;
}
@Override
public boolean isAscending() {
return ascending;
}
@Override
public boolean isNullable() {
return nullable;
}
@Override
public boolean isNullsFirst() {
return nullsFirst;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder(20);
sb.append(position);
if (ascending) {
sb.append(" ASC");
} else {
sb.append(" DESC");
}
if (nullable) {
if (nullsFirst) {
sb.append(" NULLS FIRST");
} else {
sb.append(" NULLS LAST");
}
}
return sb.toString();
}
public static OrderByElement fromString(String string, int startIndex, int endIndex) {
int spaceIndex = string.indexOf(' ', startIndex);
int pos = Integer.parseInt(string.substring(startIndex, spaceIndex));
boolean asc = string.charAt(spaceIndex + 1) == 'A';
int lastSpaceIndex = string.lastIndexOf(' ', endIndex);
if (spaceIndex == lastSpaceIndex) {
return new DefaultOrderByElement(null, pos, asc, false, false);
} else {
boolean nullFirst = string.charAt(lastSpaceIndex + 1) == 'F';
return new DefaultOrderByElement(null, pos, asc, true, nullFirst);
}
}
}