com.lyncode.jtwig.functions.internal.generic.Reverse Maven / Gradle / Ivy

Go to download
/**
 * 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.generic;

import com.lyncode.jtwig.functions.Function;
import com.lyncode.jtwig.functions.exceptions.FunctionException;
import com.lyncode.jtwig.functions.util.ObjectIterator;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

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

public class Reverse implements Function {
    @Override
    public Object execute(Object... arguments) throws FunctionException {
        requires(arguments)
            .withNumberOfArguments(equalTo(1));

        if ((arguments[0] instanceof Iterable) || arguments[0].getClass().isArray())
            return reverse(new ObjectIterator(arguments[0]), arguments[0] instanceof Iterable);
        else if (arguments[0] instanceof String)
            return new StringBuilder(((String) arguments[0])).reverse().toString();
        else return 0;
    }

    private Object reverse(ObjectIterator objectIterator, boolean list) {
        List