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package com.github.datalking.common.convert.editor;

import com.github.datalking.util.NumberUtils;
import com.github.datalking.util.StringUtils;

import java.beans.PropertyEditorSupport;
import java.text.NumberFormat;
/**
 */
public class CustomNumberEditor extends PropertyEditorSupport {

	private final Class numberClass;

	private final NumberFormat numberFormat;

	private final boolean allowEmpty;

	public CustomNumberEditor(Class numberClass, boolean allowEmpty) throws IllegalArgumentException {
		this(numberClass, null, allowEmpty);
	}

	public CustomNumberEditor(Class numberClass,
			NumberFormat numberFormat, boolean allowEmpty) throws IllegalArgumentException {

		if (numberClass == null || !Number.class.isAssignableFrom(numberClass)) {
			throw new IllegalArgumentException("Property class must be a subclass of Number");
		}
		this.numberClass = numberClass;
		this.numberFormat = numberFormat;
		this.allowEmpty = allowEmpty;
	}

	@Override
	public void setAsText(String text) throws IllegalArgumentException {
		if (this.allowEmpty && !StringUtils.hasText(text)) {
			// Treat empty String as null value.
			setValue(null);
		}
		else if (this.numberFormat != null) {
			// Use given NumberFormat for parsing text.
			setValue(NumberUtils.parseNumber(text, this.numberClass, this.numberFormat));
		}
		else {
			// Use default valueOf methods for parsing text.
			setValue(NumberUtils.parseNumber(text, this.numberClass));
		}
	}

	@Override
	public void setValue(Object value) {
		if (value instanceof Number) {
			super.setValue(NumberUtils.convertNumberToTargetClass((Number) value, this.numberClass));
		}
		else {
			super.setValue(value);
		}
	}

	@Override
	public String getAsText() {
		Object value = getValue();
		if (value == null) {
			return "";
		}
		if (this.numberFormat != null) {
			// Use NumberFormat for rendering value.
			return this.numberFormat.format(value);
		}
		else {
			// Use toString method for rendering value.
			return value.toString();
		}
	}

}