com.blazebit.persistence.impl.function.datetime.yearweek.YearWeekFunction 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.function.datetime.yearweek;
import com.blazebit.persistence.spi.FunctionRenderContext;
import com.blazebit.persistence.spi.JpqlFunction;
import com.blazebit.persistence.spi.TemplateRenderer;
/**
* @author Jan-Willem Gmelig Meyling
* @since 1.4.0
*/
public class YearWeekFunction implements JpqlFunction {
protected final TemplateRenderer renderer;
public YearWeekFunction() {
// Work in PostgreSQL (verified), Oracle 10g (according to SO)
// Does not work in H2, although it should. Interestingly, IYYY is returned correctly, but IW is not.
// Does not work in MySQL, as it lacks the TO_CHAR method.
this("TO_CHAR(?1, 'IYYY-IW')");
}
public YearWeekFunction(String template) {
this.renderer = new TemplateRenderer(template);
}
@Override
public boolean hasArguments() {
return true;
}
@Override
public boolean hasParenthesesIfNoArguments() {
return true;
}
@Override
public Class getReturnType(Class firstArgumentType) {
return String.class;
}
@Override
public void render(FunctionRenderContext context) {
if (context.getArgumentsSize() != 1) {
throw new RuntimeException("The second function needs exactly one argument ! args=" + context);
}
renderDiff(context);
}
protected void renderDiff(FunctionRenderContext context) {
renderer.start(context).addArgument(0).build();
}
}