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core/src/main/java/io/github/mmm/base/lang/ValueType.java
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| /* Copyright (c) The m-m-m Team, Licensed under the Apache License, Version 2.0 | ||
| * http://www.apache.org/licenses/LICENSE-2.0 */ | ||
| package io.github.mmm.base.lang; | ||
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| import java.util.Objects; | ||
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| import io.github.mmm.base.number.NumberType; | ||
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| /** | ||
| * Interface for generic support of a {@link #getType() value type}. It does not represent a value itself but only its | ||
| * type with ability to {@link #format(Object) format} and {@link #parse(String) parse} values of the represented type. | ||
| * | ||
| * @param <V> the {@link #getType() type type}. | ||
| * @since 1.0.0 | ||
| * @see io.github.mmm.base.number.NumberType | ||
| * @see io.github.mmm.base.temporal.TemporalType | ||
| */ | ||
| public abstract class ValueType<V> { | ||
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| /** {@link ValueType} for {@link String}. */ | ||
| public static final ValueType<String> STRING = new ValueType<>(String.class, null) { | ||
| @Override | ||
| public String parse(String value) { | ||
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| return value; | ||
| } | ||
| }; | ||
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| /** {@link ValueType} for {@link String}. */ | ||
| public static final ValueType<Boolean> BOOLEAN = new ValueType<>(Boolean.class, boolean.class) { | ||
| @Override | ||
| public Boolean parse(String value) { | ||
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| if (value == null) { | ||
| return null; | ||
| } | ||
| if ("true".equals(value)) { | ||
| return Boolean.TRUE; | ||
| } else if ("false".equals(value)) { | ||
| return Boolean.FALSE; | ||
| } | ||
| throw new IllegalArgumentException(value); | ||
| } | ||
| }; | ||
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| /** @see #getType() */ | ||
| protected final Class<V> type; | ||
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| /** @see #getType() */ | ||
| protected final Class<V> primitiveType; | ||
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| /** | ||
| * The constructor. | ||
| * | ||
| * @param type the {@link #getType() value type}. | ||
| */ | ||
| public ValueType(Class<V> type) { | ||
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| this(type, null); | ||
| } | ||
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| /** | ||
| * The constructor. | ||
| * | ||
| * @param type the {@link #getType() value type}. | ||
| * @param primitiveType the {@link #getPrimitiveType() primitive type}. | ||
| */ | ||
| public ValueType(Class<V> type, Class<V> primitiveType) { | ||
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| super(); | ||
| Objects.requireNonNull(type); | ||
| this.type = type; | ||
| this.primitiveType = primitiveType; | ||
| } | ||
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| /** | ||
| * @return the {@link Class} reflecting the {@link Number} represented by this {@link NumberType}. | ||
| */ | ||
| public Class<V> getType() { | ||
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| return this.type; | ||
| } | ||
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| /** | ||
| * @return the primitive type corresponding to the {@link #getType() value type} or {@code null} if not available. | ||
| */ | ||
| public Class<V> getPrimitiveType() { | ||
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| return this.primitiveType; | ||
| } | ||
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| /** | ||
| * @param value the value as {@link String}. | ||
| * @return the parsed value as its {@link #getType() value type}. | ||
| */ | ||
| public abstract V parse(String value); | ||
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| /** | ||
| * @param value the value to format. | ||
| * @return the {@link Object#toString() string representation} of the given {@code value}. | ||
| */ | ||
| public String format(V value) { | ||
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| if (value == null) { | ||
| return null; | ||
| } | ||
| return value.toString(); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
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| String name = this.type.getName(); | ||
| if (name.startsWith("java.")) { | ||
| return this.type.getSimpleName(); | ||
| } | ||
| return name; | ||
| } | ||
| } |
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