net.ftlines.wicket.validation.bean.ValidationContext.java Source code

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Here is the source code for net.ftlines.wicket.validation.bean.ValidationContext.java

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/**
 * 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 net.ftlines.wicket.validation.bean;

import java.util.ArrayList;
import java.util.List;

import javax.validation.ConstraintViolation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;

import org.apache.wicket.Application;
import org.apache.wicket.MetaDataKey;
import org.apache.wicket.validation.ValidationError;

/**
 * The context for validation within a Wicket application
 * 
 * @author igor
 * 
 */
public class ValidationContext {
    private static final MetaDataKey<ValidationContext> METAKEY = new MetaDataKey<ValidationContext>() {
    };

    private final ValidatorFactory validatorFactory;
    private final IViolationConverter errorFactory;
    private final List<IPropertyResolver> propertyResolvers = new ArrayList<IPropertyResolver>();

    ValidationContext(ValidatorFactory validatorFactory, IViolationConverter errorFactory,
            List<IPropertyResolver> propertyResolvers) {
        this.validatorFactory = validatorFactory;
        this.errorFactory = errorFactory;
        this.propertyResolvers.addAll(propertyResolvers);
    }

    /**
     * Gets a {@link Validator} instance
     * 
     * @return
     */
    public Validator getValidator() {
        return validatorFactory.usingContext()
                .messageInterpolator(new SessionLocaleInterpolator(validatorFactory.getMessageInterpolator()))
                .getValidator();
    }

    /**
     * Converts a {@link ConstraintViolation} into a {@link ValidationError} using the
     * {@link IViolationConverter} specified in the {@link ValidationContext}
     * 
     * @param violation
     * @return
     */
    public ValidationError convert(ConstraintViolation<?> violation) {
        return errorFactory.convert(violation);
    }

    public IProperty resolveProperty(Object object) {
        for (IPropertyResolver resolver : propertyResolvers) {
            IProperty property = resolver.resolve(object);
            if (property != null) {
                return property;
            }
        }
        return null;
    }

    void bind(Application application) {
        application.setMetaData(METAKEY, this);
    }

    /**
     * Gets the {@link ValidationContext} associated with the specified {@code application}
     * 
     * @param application
     * @return
     */
    public static ValidationContext get(Application application) {
        ValidationContext validation = application.getMetaData(METAKEY);
        if (validation == null) {
            throw new IllegalStateException("No ValidationConfiguration instance bound to Application");
        }
        return validation;
    }

    /**
     * Gets the {@link ValidationContext} associated with the thread's current {@link Application}
     * instance
     * 
     * @return
     */
    public static ValidationContext get() {
        return get(Application.get());
    }

}