NumericObjectArrayStringConverterFactory.java
/*
* Copyright 2010-present Stephen Colebourne
*
* 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 org.joda.convert.factory;
import java.util.Arrays;
import org.joda.convert.StringConverter;
import org.joda.convert.StringConverterFactory;
import org.joda.convert.TypedStringConverter;
/**
* Factory for {@code StringConverter} providing support for numeric object arrays
* as a comma separated list, using '-' for null.
* <p>
* To use, simply register the instance with a {@code StringConvert} instance.
* <p>
* This class is immutable and thread-safe.
*
* @since 1.5
*/
public final class NumericObjectArrayStringConverterFactory implements StringConverterFactory {
/**
* Singleton instance.
*/
public static final StringConverterFactory INSTANCE = new NumericObjectArrayStringConverterFactory();
/**
* Restricted constructor.
*/
private NumericObjectArrayStringConverterFactory() {
}
//-----------------------------------------------------------------------
/**
* Finds a converter by type.
*
* @param cls the type to lookup, not null
* @return the converter, null if not found
* @throws RuntimeException (or subclass) if source code is invalid
*/
@Override
public StringConverter<?> findConverter(Class<?> cls) {
if (cls.isArray()) {
if (cls == Long[].class) {
return LongArrayStringConverter.INSTANCE;
}
if (cls == Integer[].class) {
return IntArrayStringConverter.INSTANCE;
}
if (cls == Short[].class) {
return ShortArrayStringConverter.INSTANCE;
}
if (cls == Double[].class) {
return DoubleArrayStringConverter.INSTANCE;
}
if (cls == Float[].class) {
return FloatArrayStringConverter.INSTANCE;
}
}
return null;
}
//-----------------------------------------------------------------------
@Override
public String toString() {
return getClass().getSimpleName();
}
//-----------------------------------------------------------------------
enum LongArrayStringConverter implements TypedStringConverter<Long[]> {
INSTANCE {
@Override
public String convertToString(Long[] array) {
if (array.length == 0) {
return "";
}
StringBuilder buf = new StringBuilder(array.length * 8);
buf.append(array[0] != null ? array[0] : "-");
for (int i = 1; i < array.length; i++) {
buf.append(',').append(array[i] != null ? array[i] : "-");
}
return buf.toString();
}
@Override
public Long[] convertFromString(Class<? extends Long[]> cls, String str) {
if (str.length() == 0) {
return EMPTY;
}
int count = 0;
int base = 0;
int sep = str.indexOf(',');
Long[] array = new Long[str.length() / 2 + 1];
while (sep >= 0) {
String split = str.substring(base, sep);
array[count++] = split.equals("-") ? null : Long.valueOf(split);
base = sep + 1;
sep = str.indexOf(',', sep + 1);
}
String split = str.substring(base, str.length());
array[count++] = split.equals("-") ? null : Long.valueOf(split);
return Arrays.copyOf(array, count);
}
@Override
public Class<?> getEffectiveType() {
return Long[].class;
}
};
private static final Long[] EMPTY = new Long[0];
}
//-----------------------------------------------------------------------
enum IntArrayStringConverter implements TypedStringConverter<Integer[]> {
INSTANCE {
@Override
public String convertToString(Integer[] array) {
if (array.length == 0) {
return "";
}
StringBuilder buf = new StringBuilder(array.length * 6);
buf.append(array[0] != null ? array[0] : "-");
for (int i = 1; i < array.length; i++) {
buf.append(',').append(array[i] != null ? array[i] : "-");
}
return buf.toString();
}
@Override
public Integer[] convertFromString(Class<? extends Integer[]> cls, String str) {
if (str.length() == 0) {
return EMPTY;
}
int count = 0;
int base = 0;
int sep = str.indexOf(',');
Integer[] array = new Integer[str.length() / 2 + 1];
while (sep >= 0) {
String split = str.substring(base, sep);
array[count++] = split.equals("-") ? null : Integer.valueOf(split);
base = sep + 1;
sep = str.indexOf(',', sep + 1);
}
String split = str.substring(base, str.length());
array[count++] = split.equals("-") ? null : Integer.valueOf(split);
return Arrays.copyOf(array, count);
}
@Override
public Class<?> getEffectiveType() {
return Integer[].class;
}
};
private static final Integer[] EMPTY = new Integer[0];
}
//-----------------------------------------------------------------------
enum ShortArrayStringConverter implements TypedStringConverter<Short[]> {
INSTANCE {
@Override
public String convertToString(Short[] array) {
if (array.length == 0) {
return "";
}
StringBuilder buf = new StringBuilder(array.length * 3);
buf.append(array[0] != null ? array[0] : "-");
for (int i = 1; i < array.length; i++) {
buf.append(',').append(array[i] != null ? array[i] : "-");
}
return buf.toString();
}
@Override
public Short[] convertFromString(Class<? extends Short[]> cls, String str) {
if (str.length() == 0) {
return EMPTY;
}
int count = 0;
int base = 0;
int sep = str.indexOf(',');
Short[] array = new Short[str.length() / 2 + 1];
while (sep >= 0) {
String split = str.substring(base, sep);
array[count++] = split.equals("-") ? null : Short.valueOf(split);
base = sep + 1;
sep = str.indexOf(',', sep + 1);
}
String split = str.substring(base, str.length());
array[count++] = split.equals("-") ? null : Short.valueOf(split);
return Arrays.copyOf(array, count);
}
@Override
public Class<?> getEffectiveType() {
return Short[].class;
}
};
private static final Short[] EMPTY = new Short[0];
}
//-----------------------------------------------------------------------
enum DoubleArrayStringConverter implements TypedStringConverter<Double[]> {
INSTANCE {
@Override
public String convertToString(Double[] array) {
if (array.length == 0) {
return "";
}
StringBuilder buf = new StringBuilder(array.length * 8);
buf.append(array[0] != null ? array[0] : "-");
for (int i = 1; i < array.length; i++) {
buf.append(',').append(array[i] != null ? array[i] : "-");
}
return buf.toString();
}
@Override
public Double[] convertFromString(Class<? extends Double[]> cls, String str) {
if (str.length() == 0) {
return EMPTY;
}
int count = 0;
int base = 0;
int sep = str.indexOf(',');
Double[] array = new Double[str.length() / 2 + 1];
while (sep >= 0) {
String split = str.substring(base, sep);
array[count++] = split.equals("-") ? null : Double.valueOf(split);
base = sep + 1;
sep = str.indexOf(',', sep + 1);
}
String split = str.substring(base, str.length());
array[count++] = split.equals("-") ? null : Double.valueOf(split);
return Arrays.copyOf(array, count);
}
@Override
public Class<?> getEffectiveType() {
return Double[].class;
}
};
private static final Double[] EMPTY = new Double[0];
}
//-----------------------------------------------------------------------
enum FloatArrayStringConverter implements TypedStringConverter<Float[]> {
INSTANCE {
@Override
public String convertToString(Float[] array) {
if (array.length == 0) {
return "";
}
StringBuilder buf = new StringBuilder(array.length * 8);
buf.append(array[0] != null ? array[0] : "-");
for (int i = 1; i < array.length; i++) {
buf.append(',').append(array[i] != null ? array[i] : "-");
}
return buf.toString();
}
@Override
public Float[] convertFromString(Class<? extends Float[]> cls, String str) {
if (str.length() == 0) {
return EMPTY;
}
int count = 0;
int base = 0;
int sep = str.indexOf(',');
Float[] array = new Float[str.length() / 2 + 1];
while (sep >= 0) {
String split = str.substring(base, sep);
array[count++] = split.equals("-") ? null : Float.valueOf(split);
base = sep + 1;
sep = str.indexOf(',', sep + 1);
}
String split = str.substring(base, str.length());
array[count++] = split.equals("-") ? null : Float.valueOf(split);
return Arrays.copyOf(array, count);
}
@Override
public Class<?> getEffectiveType() {
return Float[].class;
}
};
private static final Float[] EMPTY = new Float[0];
}
}