com.blazebit.persistence.impl.function.concat.ConcatFunction Maven / Gradle / Ivy

/*
 * Copyright 2014 - 2020 Blazebit.
 *
 * 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.blazebit.persistence.impl.function.concat;

import com.blazebit.persistence.spi.FunctionRenderContext;
import com.blazebit.persistence.spi.JpqlFunction;

/**
 *
 * @author Christian Beikov
 * @since 1.0.0
 */
public class ConcatFunction implements JpqlFunction {

    public static final String FUNCTION_NAME = "concat";
    public static final ConcatFunction INSTANCE = new ConcatFunction();

    @Override
    public boolean hasArguments() {
        return true;
    }

    @Override
    public boolean hasParenthesesIfNoArguments() {
        return true;
    }

    @Override
    public Class getReturnType(Class firstArgumentType) {
        return String.class;
    }

    @Override
    public void render(FunctionRenderContext context) {
        context.addChunk("concat(");
        context.addArgument(0);
        for (int i = 1; i < context.getArgumentsSize(); i++) {
            context.addChunk(",");
            context.addArgument(i);
        }
        context.addChunk(")");
    }

    public String startConcat() {
        return "concat(";
    }

    public String endConcat() {
        return ")";
    }

    public String concatSeparator() {
        return ",";
    }
}