com.lyncode.jtwig.functions.internal.cast.ToDouble Maven / Gradle / Ivy

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/**
 * Copyright 2012 Lyncode
 *
 * 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.functions.internal.cast;

import com.lyncode.jtwig.functions.JtwigFunction;
import com.lyncode.jtwig.functions.annotations.JtwigFunctionDeclaration;
import com.lyncode.jtwig.functions.exceptions.FunctionException;

import static com.lyncode.jtwig.functions.util.Requirements.requires;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.core.IsInstanceOf.instanceOf;

@JtwigFunctionDeclaration(name = "toDouble", aliases = {"toFloat"})
public class ToDouble implements JtwigFunction {
    @Override
    public Object execute(Object... arguments) throws FunctionException {
        requires(arguments)
                .withNumberOfArguments(equalTo(1))
                .withArgument(0, instanceOf(Number.class));

        if (arguments[0] instanceof Number)
            return ((Number) arguments[0]).doubleValue();
        else {
            try {
                return Double.valueOf(arguments[0].toString());
            } catch (NumberFormatException e) {
                throw new FunctionException(e.getMessage(), e);
            }
        }
    }
}