AbstractRegexValidator.java

/*
 * Copyright 2012 Soichiro Kashima
 *
 * 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 com.androidformenhancer.validator;

import android.text.TextUtils;

import com.androidformenhancer.FieldData;

import java.lang.annotation.Annotation;

/**
 * Validates that the value matches the regular expression.
 *
 * @author Soichiro Kashima
 */
public abstract class AbstractRegexValidator<T extends Annotation> extends Validator<T> {

    @Override
    public String validate(final T annotation, final FieldData fieldData) {
        final String value = fieldData.getValueAsString();
        if (TextUtils.isEmpty(value)) {
            return null;
        }
        if (!value.matches(getRegex(annotation))) {
            return getMessage(getNameStyleIndex(),
                    getErrorMessageResourceId(),
                    getName(fieldData, getOverrideNameResourceId(annotation)));
        }
        return null;
    }

    protected abstract String getRegex(final T annotation);

    protected abstract int getOverrideNameResourceId(final T annotation);

    protected abstract int getErrorMessageResourceId();

    protected int getNameStyleIndex() {
        return 0;
    }

}