com.github.jknack.handlebars.internal.FormatterChain.java Source code

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Here is the source code for com.github.jknack.handlebars.internal.FormatterChain.java

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/**
 * Copyright (c) 2012-2015 Edgar Espina
 *
 * This file is part of Handlebars.java.
 *
 * 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.github.jknack.handlebars.internal;

import static org.apache.commons.lang3.Validate.notNull;

import java.util.Iterator;
import java.util.List;

import com.github.jknack.handlebars.Formatter;

/**
 * Default implementation for formatter chain.
 *
 * @author edgar
 * @since 2.1.0
 */
public class FormatterChain implements Formatter.Chain {

    /** Pointer to next formatter. */
    private Iterator<Formatter> chain;

    /**
     * Creates a new {@link FormatterChain}.
     *
     * @param formatter List of available formatters.
     */
    public FormatterChain(final List<Formatter> formatter) {
        this.chain = formatter.iterator();
    }

    @Override
    public Object format(final Object value) {
        Object output;
        if (chain.hasNext()) {
            Formatter formatter = chain.next();
            output = formatter.format(value, this);
            notNull(output, "Formatter " + formatter.getClass() + " returned a null result for " + value);
        } else {
            output = value.toString();
        }
        return output;
    }

}