org.atemsource.atem.utility.transform.impl.builder.Constant.java Source code

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Here is the source code for org.atemsource.atem.utility.transform.impl.builder.Constant.java

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/*******************************************************************************
 * Stefan Meyer, 2012 Licensed under the Apache License, Version 2.0 (the "License"); you may not use this fi in
 * compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LIC Unless
 * required by applicable law or agreed to in writing, software distributed under the License is distr an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License specific language governing
 * permissions and limitations under the License.
 ******************************************************************************/
package org.atemsource.atem.utility.transform.impl.builder;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.atemsource.atem.api.attribute.relation.SingleAttribute;
import org.atemsource.atem.api.type.EntityType;
import org.atemsource.atem.api.type.EntityTypeBuilder;
import org.atemsource.atem.api.type.Type;
import org.atemsource.atem.utility.path.AttributePath;
import org.atemsource.atem.utility.transform.api.AttributeTransformation;
import org.atemsource.atem.utility.transform.api.JavaTransformation;
import org.atemsource.atem.utility.transform.api.TransformationContext;
import org.atemsource.atem.utility.transform.impl.transformation.GenericAttributeTransformation;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

/**
 * Thie builder creates a single target attribute with a constant value.
 */
@Component
@Scope("prototype")
public class Constant<A, B>
        extends AbstractAttributeTransformationBuilder<A, B, GenericTransformationBuilder<A, B>> {
    private Object constantValue;

    private String targetAttribute;

    private Class<?> targetClass;

    @Override
    public void build(EntityTypeBuilder entityTypeBuilder) {
        Type<?> attributeTargetType;
        Type[] validTypes;
        attributeTargetType = entityTypeRepository.getType(targetClass);
        SingleAttribute<?> attribute = entityTypeBuilder.addSingleAttribute(targetAttribute, targetClass);
    }

    @Override
    public AttributeTransformation<A, B> create(EntityType<B> targetType) {
        GenericAttributeTransformation<A, B> instance = beanLocator
                .getInstance(GenericAttributeTransformation.class);
        Set<AttributePath> attributeAs = Collections.EMPTY_SET;
        instance.setAttributeAs(attributeAs);
        Set<AttributePath> attributeBs = new HashSet<AttributePath>();
        final AttributePath targetPath = attributePathBuilderFactory.createAttributePath(targetAttribute,
                targetType);
        attributeBs.add(targetPath);
        instance.setAttributeBs(attributeBs);
        instance.setTransformation(new JavaTransformation<A, B>() {

            @Override
            public void mergeAB(A a, B b, TransformationContext ctx) {
                targetPath.setValue(b, constantValue);
            }

            @Override
            public void mergeBA(B b, A a, TransformationContext ctx) {
            }
        });
        return instance;

    }

    @Override
    public GenericTransformationBuilder<A, B> from(String attributePath) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public A fromMethod() {
        // TODO Auto-generated method stub
        return null;
    }

    /**
     * define the name of the target attribute.
     */
    public Constant<A, B> to(String targetAttribute) {
        this.targetAttribute = targetAttribute;
        return this;
    }

    /**
     * define the type and value of the target attribute.
     */
    public <T> Constant<A, B> value(Class<T> targetClass, final T constantValue) {
        this.constantValue = constantValue;
        this.targetClass = targetClass;
        return this;
    }

}