/*
* Copyright 2013 serso aka se.solovyev
*
* 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.
*
* ---------------------------------------------------------------------
* Contact details
*
* Email: se.solovyev@gmail.com
* Site: http://se.solovyev.org
*/
package org.solovyev.common.text;
import org.solovyev.android.Check;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class NumberParser<N extends Number> implements Parser<N> {
static final List<Class<? extends Number>> supportedClasses = Arrays.<Class<? extends Number>>asList(Integer.class, Float.class, Long.class, Double.class);
private static final Map<Class<?>, Parser<?>> parsers = new HashMap<>(supportedClasses.size());
static {
for (Class<? extends Number> supportedClass : supportedClasses) {
parsers.put(supportedClass, new NumberParser<>(supportedClass));
}
}
@Nonnull
private final Class<? extends N> clazz;
private NumberParser(@Nonnull Class<? extends N> clazz) {
this.clazz = clazz;
}
@Nonnull
public static <N extends Number> Parser<N> of(@Nonnull Class<N> clazz) {
Check.isTrue(supportedClasses.contains(clazz), "Class " + clazz + " is not supported by " + NumberParser.class);
return (Parser<N>) parsers.get(clazz);
}
@Override
public N parseValue(@Nullable String value) throws IllegalArgumentException {
N result;
if (value != null) {
if (this.clazz.equals(Integer.class)) {
result = (N) Integer.valueOf(value);
} else if (this.clazz.equals(Float.class)) {
result = (N) Float.valueOf(value);
} else if (this.clazz.equals(Long.class)) {
result = (N) Long.valueOf(value);
} else if (this.clazz.equals(Double.class)) {
result = (N) Double.valueOf(value);
} else {
throw new UnsupportedOperationException(this.clazz + " is not supported!");
}
} else {
result = null;
}
return result;
}
}