ValidFileConstraint.java

package org.jtheque.ui.impl.constraints;

import org.jtheque.errors.Errors;
import org.jtheque.ui.components.FileChooser;
import org.jtheque.ui.constraints.Constraint;
import org.jtheque.ui.utils.ValidationUtils;

import java.io.File;
import java.util.Collection;

/*
 * Copyright JTheque (Baptiste Wicht)
 *
 * 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.
 */

/**
 * A constraint to indicate that the field cannot be null.
 *
 * @author Baptiste Wicht
 */
public final class ValidFileConstraint implements Constraint {
    private final String fieldName;
    private final int maxLength;

    /**
     * Construct a new NotNullConstraint.
     *
     * @param fieldName The field name.
     * @param maxLength The max length of the field.
     */
    public ValidFileConstraint(String fieldName, int maxLength) {
        super();

        this.fieldName = fieldName;
        this.maxLength = maxLength;
    }

    @Override
    public int getMaxLength() {
        return maxLength;
    }

    @Override
    public boolean isLengthControlled() {
        return false;
    }

    @Override
    public void validate(Object field, Collection<org.jtheque.errors.Error> errors) {
        if (field instanceof FileChooser) {
            String filePath = ((FileChooser) field).getFilePath();

            if (maxLength > 0) {
                ValidationUtils.rejectIfLongerThan(filePath, fieldName, maxLength, errors);
            }

            if (errors.isEmpty() && !new File(filePath).exists()) {
                errors.add(Errors.newI18nError("error.validation.field.file", new Object[]{fieldName}));
            }
        }
    }

    @Override
    public void configure(Object component) {
        //Nothing to do here
    }
}