com.google.gwt.validation.rebind.ValidatorGenerator.java Source code

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Here is the source code for com.google.gwt.validation.rebind.ValidatorGenerator.java

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/*
 * Copyright 2010 Google Inc.
 *
 * 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.google.gwt.validation.rebind;

import com.google.gwt.core.ext.Generator;
import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.TypeOracle;
import com.google.gwt.validation.client.GwtValidation;

/**
 * <strong>EXPERIMENTAL</strong> and subject to change. Do not use this in
 * production code.
 * <p>
 * Generates the generic {@link javax.validation.Validator}. The generic
 * validator only handles the classes listed in the
 * {@link com.google.gwt.validation.client.GwtValidation} annotation. See
 * {@link com.google.gwt.validation.client.GwtValidation} for usage.
 */
public class ValidatorGenerator extends Generator {

    @Override
    public String generate(TreeLogger logger, GeneratorContext context, String typeName)
            throws UnableToCompleteException {
        TypeOracle typeOracle = context.getTypeOracle();
        assert (typeOracle != null);

        JClassType validatorType = typeOracle.findType(typeName);
        if (validatorType == null) {
            logger.log(TreeLogger.ERROR, "Unable to find metadata for type '" + typeName + "'", null);
            throw new UnableToCompleteException();
        }

        GwtValidation gwtValidation = validatorType.findAnnotationInTypeHierarchy(GwtValidation.class);

        if (gwtValidation == null) {
            logger.log(TreeLogger.ERROR,
                    typeName + " must be anntotated with " + GwtValidation.class.getCanonicalName(), null);
            throw new UnableToCompleteException();
        }

        if (gwtValidation.value().length == 0) {
            logger.log(TreeLogger.ERROR, "The @" + GwtValidation.class.getSimpleName() + "  of " + typeName
                    + "must specify at least one bean type to validate.", null);
            throw new UnableToCompleteException();
        }

        TreeLogger validatorLogger = logger.branch(TreeLogger.DEBUG,
                "Generating Validator for  '" + validatorType.getQualifiedSourceName() + "'", null);
        AbstractCreator creator = new ValidatorCreator(validatorType, gwtValidation, validatorLogger, context);
        return creator.create();
    }
}