com.abubusoft.kripton.processor.sqlite.SelectScalarHelper Maven / Gradle / Ivy

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/*******************************************************************************
 * Copyright 2015, 2017 Francesco Benincasa ([email protected]).
 *
 * 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.abubusoft.kripton.processor.sqlite;

import java.util.Set;

import com.abubusoft.kripton.processor.core.AssertKripton;
import com.abubusoft.kripton.processor.core.reflect.TypeUtility;
import com.abubusoft.kripton.processor.sqlite.grammars.jql.JQLProjection;
import com.abubusoft.kripton.processor.sqlite.model.SQLiteModelMethod;
import com.abubusoft.kripton.processor.sqlite.transform.SQLTransform;
import com.abubusoft.kripton.processor.sqlite.transform.SQLTransformer;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeName;
import com.squareup.javapoet.TypeSpec;

// TODO: Auto-generated Javadoc
/**
 * Manage query with only one value.
 *
 * @author Francesco Benincasa ([email protected])
 * @since 17/mag/2016
 */
public class SelectScalarHelper extends AbstractSelectCodeGenerator {

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.abubusoft.kripton.processor.sqlite.SQLiteSelectBuilder.
	 * SelectCodeGenerator#generate(com.squareup.javapoet.MethodSpec.Builder)
	 */
	@Override
	public void generateSpecializedPart(SQLiteModelMethod method, TypeSpec.Builder classBuilder, MethodSpec.Builder methodBuilder, Set fieldList, boolean mapFields) {
		TypeName returnTypeName = method.getReturnClass();

		//ASSERT: returnType is a supported type
		
		// no column or too many columns
		AssertKripton.assertTrueOrInvalidMethodSignException(fieldList.size() == 1, method, "no way to understand which field is the result for this method");				

		SQLTransform t = SQLTransformer.lookup(returnTypeName);

		methodBuilder.addCode("$T result=", returnTypeName);
		t.generateDefaultValue(methodBuilder);
		methodBuilder.addCode(";\n");

		methodBuilder.addCode("\n");
		// methodBuilder.beginControlFlow("try");
		methodBuilder.beginControlFlow("if (_cursor.moveToFirst())");

		// generate index from columns
		methodBuilder.addCode("\n");

		if (TypeUtility.isNullable(returnTypeName)) {
			methodBuilder.addCode("if (_cursor.isNull(0)) { return null; }\n");
		} else {
			methodBuilder.addCode("if (_cursor.isNull(0)) { return ");
			t.generateDefaultValue(methodBuilder);
			methodBuilder.addCode("; }\n", t);
		}
		methodBuilder.addCode("result=");
		t.generateReadValueFromCursor(methodBuilder, method.getParent(), returnTypeName, "_cursor", "0");
		methodBuilder.addCode(";\n");

		// end cursor
		methodBuilder.endControlFlow();

		methodBuilder.addCode("return result;\n");
		// end method
		methodBuilder.endControlFlow();
	}

}