com.u1aryz.gae.lib.jsonvalidator.MaxlengthValidator Maven / Gradle / Ivy

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package com.u1aryz.gae.lib.jsonvalidator;

import org.slim3.util.ApplicationMessage;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

/**
 * A validator for maximum length check.
 * 
 * @author u1aryz
 * 
 */
public class MaxlengthValidator extends AbstractValidator {

	/**
	 * The maximum length.
	 */
	protected int maxlength;

	/**
	 * Constructor.
	 * 
	 * @param maxlength
	 *            the maximum length
	 */
	public MaxlengthValidator(int maxlength) {
		this(maxlength, null);
	}

	/**
	 * Constructor.
	 * 
	 * @param maxlength
	 *            the maximum length
	 * @param message
	 *            the error message
	 */
	public MaxlengthValidator(int maxlength, String message) {
		super(message);
		this.maxlength = maxlength;
	}

	@Override
	public String validate(JsonObject object, String name) {
		JsonElement element = object.get(name);

		// if the element is of the array type
		if (element != null && element.isJsonArray()) {
			return null;
		}

		String value = element == null ? null : element.getAsString();
		if (value == null || "".equals(value)) {
			return null;
		}
		if (value.length() <= maxlength) {
			return null;
		}

		if (message != null) {
			return message;
		}
		return ApplicationMessage.get(getMessageKey(), getLabel(name),
				maxlength);
	}

	@Override
	protected String getMessageKey() {
		return "validator.maxlength";
	}

}