NumericArrayStringConverterFactory.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 primitive arrays
* as a comma separated list.
* <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 NumericArrayStringConverterFactory implements StringConverterFactory {
/**
* Singleton instance.
*/
public static final StringConverterFactory INSTANCE = new NumericArrayStringConverterFactory();
/**
* Restricted constructor.
*/
private NumericArrayStringConverterFactory() {
}
//-----------------------------------------------------------------------
/**
* 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() && cls.getComponentType().isPrimitive()) {
if (cls == long[].class) {
return LongArrayStringConverter.INSTANCE;
}
if (cls == int[].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]);
for (int i = 1; i < array.length; i++) {
buf.append(',').append(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) {
array[count++] = Long.parseLong(str.substring(base, sep));
base = sep + 1;
sep = str.indexOf(',', sep + 1);
}
array[count++] = Long.parseLong(str.substring(base, str.length()));
return Arrays.copyOf(array, count);
}
@Override
public Class<?> getEffectiveType() {
return long[].class;
}
};
private static final long[] EMPTY = new long[0];
}
//-----------------------------------------------------------------------
enum IntArrayStringConverter implements TypedStringConverter<int[]> {
INSTANCE {
@Override
public String convertToString(int[] array) {
if (array.length == 0) {
return "";
}
StringBuilder buf = new StringBuilder(array.length * 6);
buf.append(array[0]);
for (int i = 1; i < array.length; i++) {
buf.append(',').append(array[i]);
}
return buf.toString();
}
@Override
public int[] convertFromString(Class<? extends int[]> cls, String str) {
if (str.length() == 0) {
return EMPTY;
}
int count = 0;
int base = 0;
int sep = str.indexOf(',');
int[] array = new int[str.length() / 2 + 1];
while (sep >= 0) {
array[count++] = Integer.parseInt(str.substring(base, sep));
base = sep + 1;
sep = str.indexOf(',', sep + 1);
}
array[count++] = Integer.parseInt(str.substring(base, str.length()));
return Arrays.copyOf(array, count);
}
@Override
public Class<?> getEffectiveType() {
return int[].class;
}
};
private static final int[] EMPTY = new int[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]);
for (int i = 1; i < array.length; i++) {
buf.append(',').append(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) {
array[count++] = Short.parseShort(str.substring(base, sep));
base = sep + 1;
sep = str.indexOf(',', sep + 1);
}
array[count++] = Short.parseShort(str.substring(base, str.length()));
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]);
for (int i = 1; i < array.length; i++) {
buf.append(',').append(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) {
array[count++] = Double.parseDouble(str.substring(base, sep));
base = sep + 1;
sep = str.indexOf(',', sep + 1);
}
array[count++] = Double.parseDouble(str.substring(base, str.length()));
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]);
for (int i = 1; i < array.length; i++) {
buf.append(',').append(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) {
array[count++] = Float.parseFloat(str.substring(base, sep));
base = sep + 1;
sep = str.indexOf(',', sep + 1);
}
array[count++] = Float.parseFloat(str.substring(base, str.length()));
return Arrays.copyOf(array, count);
}
@Override
public Class<?> getEffectiveType() {
return float[].class;
}
};
private static final float[] EMPTY = new float[0];
}
}