/*
* Copyright (C) 2014 The Datarobot Authors
*
* 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.arconsis.android.datarobot.builder.schema.reader;
import javax.annotation.processing.Messager;
import javax.lang.model.element.VariableElement;
import javax.tools.Diagnostic.Kind;
import com.arconsis.android.datarobot.builder.schema.data.Column;
import com.arconsis.android.datarobot.entity.AutoIncrement;
import com.arconsis.android.datarobot.entity.PrimaryKey;
import com.arconsis.android.datarobot.schema.ColumnType;
/**
* @author Falk Appel
* @author Alexander Frank
*/
public class ColumnReader implements Reader<Column> {
private final VariableElement column;
private final Messager messager;
public ColumnReader(final VariableElement column, final Messager messager) {
this.column = column;
this.messager = messager;
}
@Override
public Column read() {
String nameInEntity = column.getSimpleName().toString();
String typeInEntity = column.asType().toString();
boolean isPrimaryKey = isPrimaryKeyAnnotated(column);
boolean isAutoincrementing = isAutoIncrementAnnotated(column);
checkPrimaryKeyAndAutoincrementLocation(isPrimaryKey, isAutoincrementing, column, typeInEntity);
try {
return new Column(nameInEntity, typeInEntity, ColumnType.resolveColumnType(typeInEntity), isPrimaryKey, isAutoincrementing);
} catch (IllegalStateException e) {
messager.printMessage(Kind.ERROR, e.getMessage(), column);
return null;
}
}
private boolean isPrimaryKeyAnnotated(final VariableElement variableElement) {
return variableElement.getAnnotation(PrimaryKey.class) != null;
}
private boolean isAutoIncrementAnnotated(final VariableElement variableElement) {
return variableElement.getAnnotation(AutoIncrement.class) != null;
}
private void checkPrimaryKeyAndAutoincrementLocation(final boolean hasPrimaryKey, final boolean hasAutoIncrement, final VariableElement variableElement,
final String fieldType) {
if (!hasPrimaryKey && hasAutoIncrement) {
messager.printMessage(Kind.ERROR, "@AutoIncrement is only allowed for @PrimaryKey fields", variableElement);
} else if (hasPrimaryKey && fieldIsNotAWholeNumber(fieldType)) {
messager.printMessage(Kind.ERROR, "@PrimaryKey is only allowed for non-primitiv whole-numbers", variableElement);
}
}
private boolean fieldIsNotAWholeNumber(final String fieldType) {
return !Integer.class.getCanonicalName().equals(fieldType) && //
!Long.class.getCanonicalName().equals(fieldType);
}
}