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Extensions for Java Swing

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// The MIT License (MIT)
//
// Copyright (c) 2019 Timothy D. Jones
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package io.github.jonestimd.swing.validation;

import java.beans.PropertyChangeListener;

/**
 * An interface for input components that provide validation feedback.
 */
public interface ValidatedComponent {
    String VALIDATION_MESSAGES = "validationMessages";

    /**
     * Perform validation of the current value.  Useful when validation depends on another component.
     */
    void validateValue();

    /**
     * Get the validation result.
     * @return a string describing the validation errors.
     */
    String getValidationMessages();

    /**
     * Add a listener to receive notification when the validation changes.
     */
    void addValidationListener(PropertyChangeListener listener);

    /**
     * Remove a listener that is receiving notification when the validation changes.
     */
    void removeValidationListener(PropertyChangeListener listener);

    boolean isVisible();
}