com.lyncode.jtwig.expressions.model.Constant Maven / Gradle / Ivy

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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 com.lyncode.jtwig.expressions.model;

import com.lyncode.jtwig.compile.CompileContext;
import com.lyncode.jtwig.exception.CalculateException;
import com.lyncode.jtwig.exception.CompileException;
import com.lyncode.jtwig.expressions.api.CompilableExpression;
import com.lyncode.jtwig.expressions.api.Expression;
import com.lyncode.jtwig.render.RenderContext;

public class Constant implements CompilableExpression {
    private T value;

    public Constant(T value) {
        this.value = value;
    }

    public T getValue() {
        return value;
    }

    public boolean isInstanceOf (Class clazzToTest) {
        return clazzToTest.isInstance(value);
    }

    public  S as (Class type) {
        return type.cast(this.value);
    }

    public boolean isNull () {
        return value == null;
    }

    @Override
    public Expression compile(CompileContext context) throws CompileException {
        return new Compiled(value);
    }

    public static class Compiled implements Expression {
        private final Object value;

        public Compiled(Object value) {
            this.value = value;
        }

        @Override
        public Object calculate(RenderContext context) throws CalculateException {
            return value;
        }
    }
}