com.speedment.common.codegen.internal.java.view.trait.HasValueView Maven / Gradle / Ivy

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A Speedment bundle that shades all dependencies into one jar. This is useful when deploying an application on a server.

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/*
 *
 * Copyright (c) 2006-2019, Speedment, Inc. All Rights Reserved.
 *
 * 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.speedment.common.codegen.internal.java.view.trait;

import com.speedment.common.codegen.Generator;
import com.speedment.common.codegen.Transform;
import com.speedment.common.codegen.model.trait.HasValue;

import static com.speedment.common.codegen.util.Formatting.ifelse;

/**
 * A trait with the functionality to render models with the trait 
 * {@link HasValue}.
 * 
 * @author     Emil Forslund
 * @param   The model type
 * @see        Transform
 */
public interface HasValueView> extends Transform {
    
    /**
     * Render the value of the model if it exists, else an empty string.
     * 
     * @param gen    the generator
     * @param model  the model
     * @return       the generated code
     */
    default String renderValue(Generator gen, M model) {
        return ifelse(model.getValue(), 
			v -> " = " + gen.on(v).orElse(""), 
            ""
        );
    }
}