PositionGetterFactory.java
package com.gh.mygreen.xlsmapper.fieldaccessor;
import java.awt.Point;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.util.Map;
import java.util.Optional;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.gh.mygreen.xlsmapper.util.ArgUtils;
import com.gh.mygreen.xlsmapper.util.CellPosition;
import com.gh.mygreen.xlsmapper.util.Utils;
/**
* {@link PositionGetter}のインスタンスを作成する
*
* @since 2.0
* @author T.TSUCHIE
*
*/
public class PositionGetterFactory {
private static final Logger log = LoggerFactory.getLogger(PositionGetterFactory.class);
/**
* フィールドの位置情報を取得するためのアクセッサを作成します。
* @param beanClass フィールドが定義されているクラス情報
* @param fieldName フィールドの名称
* @return 位置情報のgetterが存在しない場合は空を返す。
* @throws IllegalArgumentException {@literal beanClass == null or fieldName == null}
* @throws IllegalArgumentException {@literal fieldName.isEmpty() = true}
*/
public Optional<PositionGetter> create(final Class<?> beanClass, final String fieldName) {
ArgUtils.notNull(beanClass, "beanClass");
ArgUtils.notEmpty(fieldName, "fieldName");
// フィールド Map positionsの場合
Optional<PositionGetter> positionGetter = createMapField(beanClass, fieldName);
if(positionGetter.isPresent()) {
return positionGetter;
}
// setter メソッドの場合
positionGetter = createMethod(beanClass, fieldName);
if(positionGetter.isPresent()) {
return positionGetter;
}
// フィールド + positionの場合
positionGetter = createField(beanClass, fieldName);
if(positionGetter.isPresent()) {
return positionGetter;
}
return Optional.empty();
}
private Optional<PositionGetter> createMapField(final Class<?> beanClass, final String fieldName) {
final Field positionsField;
try {
positionsField = beanClass.getDeclaredField("positions");
positionsField.setAccessible(true);
} catch (NoSuchFieldException | SecurityException e) {
// フィールドが見つからない場合は、何もしない。
return Optional.empty();
}
if(!Map.class.isAssignableFrom(positionsField.getType())) {
return Optional.empty();
}
final ParameterizedType type = (ParameterizedType) positionsField.getGenericType();
final Class<?> keyType = (Class<?>) type.getActualTypeArguments()[0];
final Class<?> valueType = (Class<?>) type.getActualTypeArguments()[1];
if(keyType.equals(String.class) && valueType.equals(CellPosition.class)) {
return Optional.of(new PositionGetter() {
@SuppressWarnings("unchecked")
@Override
public Optional<CellPosition> get(final Object beanObj) {
ArgUtils.notNull(beanObj, "beanObj");
try {
Map<String, CellPosition> positionsMapObj = (Map<String, CellPosition>) positionsField.get(beanObj);
if(positionsMapObj == null) {
return Optional.empty();
}
return Optional.ofNullable(positionsMapObj.get(fieldName));
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new RuntimeException("fail access positions field.", e);
}
}
});
} else if(keyType.equals(String.class) && valueType.equals(Point.class)) {
return Optional.of(new PositionGetter() {
@SuppressWarnings("unchecked")
@Override
public Optional<CellPosition> get(final Object beanObj) {
ArgUtils.notNull(beanObj, "beanObj");
try {
Map<String, Point> positionsMapObj = (Map<String, Point>) positionsField.get(beanObj);
if(positionsMapObj == null) {
return Optional.empty();
}
return Optional.ofNullable(positionsMapObj.get(fieldName))
.map(a -> CellPosition.of(a));
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new RuntimeException("fail access positions field.", e);
}
}
});
} else if(keyType.equals(String.class) && valueType.equals(org.apache.poi.ss.util.CellAddress.class)) {
return Optional.of(new PositionGetter() {
@SuppressWarnings("unchecked")
@Override
public Optional<CellPosition> get(final Object beanObj) {
ArgUtils.notNull(beanObj, "beanObj");
try {
Map<String, org.apache.poi.ss.util.CellAddress> positionsMapObj = (Map<String, org.apache.poi.ss.util.CellAddress>) positionsField.get(beanObj);
if(positionsMapObj == null) {
return Optional.empty();
}
return Optional.ofNullable(positionsMapObj.get(fieldName))
.map(a -> CellPosition.of(a));
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new RuntimeException("fail access positions field.", e);
}
}
});
} else {
// タイプが一致しない場合
log.warn("not match generics type of positions. key type:{}, value type:{}.", keyType.getName(), valueType.getName());
return Optional.empty();
}
}
private Optional<PositionGetter> createMethod(final Class<?> beanClass, final String fieldName) {
final String positionMethodName = "get" + Utils.capitalize(fieldName) + "Position";
final Method method;
try {
method = beanClass.getDeclaredMethod(positionMethodName);
method.setAccessible(true);
} catch (NoSuchMethodException | SecurityException e) {
return Optional.empty();
}
if(method.getReturnType().equals(CellPosition.class)) {
return Optional.of(new PositionGetter() {
@Override
public Optional<CellPosition> get(final Object beanObj) {
ArgUtils.notNull(beanObj, "beanObj");
try {
final CellPosition address = (CellPosition)method.invoke(beanObj);
return Optional.ofNullable(address);
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
throw new RuntimeException("fail access positions getter method.", e);
}
}
});
} else if(method.getReturnType().equals(Point.class)) {
return Optional.of(new PositionGetter() {
@Override
public Optional<CellPosition> get(final Object beanObj) {
ArgUtils.notNull(beanObj, "beanObj");
try {
final Point point = (Point)method.invoke(beanObj);
return Optional.ofNullable(point).map(p -> CellPosition.of(p));
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
throw new RuntimeException("fail access positions getter method.", e);
}
}
});
} else if(method.getReturnType().equals(org.apache.poi.ss.util.CellAddress.class)) {
return Optional.of(new PositionGetter() {
@Override
public Optional<CellPosition> get(final Object beanObj) {
ArgUtils.notNull(beanObj, "beanObj");
try {
final org.apache.poi.ss.util.CellAddress address = (org.apache.poi.ss.util.CellAddress)method.invoke(beanObj);
return Optional.ofNullable(address).map(a -> CellPosition.of(a));
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
throw new RuntimeException("fail access positions getter method.", e);
}
}
});
}
return Optional.empty();
}
private Optional<PositionGetter> createField(final Class<?> beanClass, final String fieldName) {
final String positionFieldName = fieldName + "Position";
final Field positionField;
try {
positionField = beanClass.getDeclaredField(positionFieldName);
positionField.setAccessible(true);
} catch (NoSuchFieldException | SecurityException e) {
return Optional.empty();
}
if(positionField.getType().equals(CellPosition.class)) {
return Optional.of(new PositionGetter() {
@Override
public Optional<CellPosition> get(final Object beanObj) {
ArgUtils.notNull(beanObj, "beanObj");
try {
final CellPosition address = (CellPosition) positionField.get(beanObj);
return Optional.ofNullable(address);
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new RuntimeException("fail access position field.", e);
}
}
});
} else if(positionField.getType().equals(Point.class)) {
return Optional.of(new PositionGetter() {
@Override
public Optional<CellPosition> get(final Object beanObj) {
ArgUtils.notNull(beanObj, "beanObj");
try {
final Point point = (Point) positionField.get(beanObj);
return Optional.ofNullable(point).map(p -> CellPosition.of(p));
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new RuntimeException("fail access position field.", e);
}
}
});
} else if(positionField.getType().equals(org.apache.poi.ss.util.CellAddress.class)) {
return Optional.of(new PositionGetter() {
@Override
public Optional<CellPosition> get(final Object beanObj) {
ArgUtils.notNull(beanObj, "beanObj");
try {
final org.apache.poi.ss.util.CellAddress address = (org.apache.poi.ss.util.CellAddress) positionField.get(beanObj);
return Optional.ofNullable(address).map(a -> CellPosition.of(a));
} catch (IllegalArgumentException | IllegalAccessException e) {
throw new RuntimeException("fail access position field.", e);
}
}
});
}
return Optional.empty();
}
}