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org.apache.cayenne.reflect.ConverterFactory Maven / Gradle / Ivy
/*****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* https://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 org.apache.cayenne.reflect;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Timestamp;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
* A factory of property type converters.
*
* @since 1.2
*/
public class ConverterFactory {
static final ConverterFactory factory = new ConverterFactory();
private final Map, Converter> converters;
private final EnumConverter enumConverter = new EnumConverter<>();
private final Converter toAnyConverter = new ToAnyConverter<>();
// TODO: this methods uses deprecated Date.parse method that has no direct replacement,
// we need to determine date formats we should support and update code accordingly
@SuppressWarnings("deprecation")
private ConverterFactory() {
Converter toStringConverter = (object, type) -> object != null ? object.toString() : null;
Converter toBooleanConverter = (object, type) -> {
if (object == null) {
return type.isPrimitive() ? Boolean.FALSE : null;
}
if (object instanceof Boolean) {
return (Boolean) object;
} else if (object instanceof Integer || object instanceof Long || object instanceof Short || object instanceof Byte) {
if (((Number) object).longValue() == 0) {
return Boolean.FALSE;
} else if (((Number) object).longValue() == 1) {
return Boolean.TRUE;
}
}
return "true".equalsIgnoreCase(object.toString())
? Boolean.TRUE
: Boolean.FALSE;
};
Converter toLongConverter = (object, type) -> {
if (object == null) {
return type.isPrimitive() ? 0L : null;
}
if (object instanceof Long) {
return (Long) object;
}
return Long.valueOf(object.toString());
};
Converter toIntConverter = (object, type) -> {
if (object == null) {
return type.isPrimitive() ? 0 : null;
}
if (object instanceof Integer) {
return (Integer) object;
}
return Integer.valueOf(object.toString());
};
Converter toByteConverter = (object, type) -> {
if (object == null) {
return type.isPrimitive() ? (byte) 0 : null;
}
if (object instanceof Byte) {
return (Byte) object;
}
return Byte.valueOf(object.toString());
};
Converter toShortConverter = (object, type) -> {
if (object == null) {
return type.isPrimitive() ? (short) 0 : null;
}
if (object instanceof Short) {
return (Short) object;
}
return Short.valueOf(object.toString());
};
Converter toCharConverter = (object, type) -> {
if (object == null) {
return type.isPrimitive() ? (char) 0 : null;
}
if (object instanceof Character) {
return (Character) object;
}
String string = object.toString();
return string.length() > 0 ? string.charAt(0) : 0;
};
Converter toDoubleConverter = (object, type) -> {
if (object == null) {
return type.isPrimitive() ? 0.0d : null;
}
if (object instanceof Double) {
return (Double) object;
}
return Double.valueOf(object.toString());
};
Converter toFloatConverter = (object, type) -> {
if (object == null) {
return type.isPrimitive() ? 0.0f : null;
}
if (object instanceof Float) {
return (Float) object;
}
return Float.valueOf(object.toString());
};
Converter toBigDecimalConverter = (object, type) -> {
if (object == null) {
return null;
}
if (object instanceof BigDecimal) {
return (BigDecimal) object;
}
return new BigDecimal(object.toString());
};
Converter toBigIntegerConverter = (object, type) -> {
if (object == null) {
return null;
}
if (object instanceof BigInteger) {
return (BigInteger) object;
}
return new BigInteger(object.toString());
};
Converter toDateConverter = (value, type) -> {
if (value == null) {
return null;
}
if (value instanceof Date) {
return (Date) value;
}
if (value instanceof Number) {
return new Date(((Number) value).longValue());
}
return new Date(value.toString());
};
Converter toTimestampConverter = (value, type) -> {
if (value == null) {
return null;
}
if (value instanceof Timestamp) {
return (Timestamp) value;
}
if (value instanceof Number) {
return new Timestamp(((Number) value).longValue());
}
return new Timestamp(Date.parse(value.toString()));
};
// TODO: byte[] converter...
converters = new HashMap<>();
_addConverter(Boolean.class, toBooleanConverter);
_addConverter(boolean.class, toBooleanConverter);
_addConverter(Short.class, toShortConverter);
_addConverter(short.class, toShortConverter);
_addConverter(Byte.class, toByteConverter);
_addConverter(byte.class, toByteConverter);
_addConverter(Integer.class, toIntConverter);
_addConverter(int.class, toIntConverter);
_addConverter(Long.class, toLongConverter);
_addConverter(long.class, toLongConverter);
_addConverter(Double.class, toDoubleConverter);
_addConverter(double.class, toDoubleConverter);
_addConverter(Float.class, toFloatConverter);
_addConverter(float.class, toFloatConverter);
_addConverter(Character.class, toCharConverter);
_addConverter(char.class, toCharConverter);
_addConverter(BigDecimal.class, toBigDecimalConverter);
_addConverter(BigInteger.class, toBigIntegerConverter);
_addConverter(Number.class, toBigDecimalConverter);
_addConverter(String.class, toStringConverter);
_addConverter(Date.class, toDateConverter);
_addConverter(Timestamp.class, toTimestampConverter);
}
/**
* Converters are used by {@link PropertyUtils#setProperty(Object, String, Object)} to coerce
* generic Object values into the specific type expected by the named setter.
*
* @param type the Class to convert a value to; the destination type
* @param converter a converter used to convert the value from Object to T
* @since 4.0
*/
public static void addConverter(Class type, Converter converter) {
factory._addConverter(type, converter);
}
private void _addConverter(Class type, Converter converter) {
converters.put(type, converter);
}
@SuppressWarnings("unchecked")
Converter getConverter(Class type) {
if (type == null) {
throw new IllegalArgumentException("Null type");
}
// check for enum BEFORE super call, as it will return a noop converter
if (type.isEnum()) {
return (Converter) enumConverter;
}
Converter c = (Converter) converters.get(type);
return c != null ? c : (Converter) toAnyConverter;
}
}
