com.github.jknack.amd4j.Minifier.java Source code

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Here is the source code for com.github.jknack.amd4j.Minifier.java

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/**
 * Copyright (c) 2013 Edgar Espina
 *
 * This file is part of amd4j (https://github.com/jknack/amd4j)
 *
 * 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.amd4j;

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

import java.util.HashMap;
import java.util.Map;

/**
 * Minify/Optimize JavaScript code.
 *
 * @author edgar.espina
 * @since 0.2.0
 */
public abstract class Minifier {

    /**
     * The default minifier.
     */
    public static final Minifier NONE = new Minifier() {
        @Override
        public CharSequence minify(final Config config, final CharSequence input) {
            return input;
        }
    };

    /**
     * The minifiers registry.
     */
    private static Map<String, Minifier> registry = new HashMap<String, Minifier>();

    static {
        register("none", NONE);

        register("white", new WhiteMinifier());
    }

    /**
     * Minify/Optimize JavaScript code.
     *
     * @param config The configuration options.
     * @param input The JavaScript code.
     * @return A minified output.
     */
    public abstract CharSequence minify(Config config, CharSequence input);

    /**
     * Get a minifier by name.
     *
     * @param name The minifier name.
     * @return A minifier.
     */
    public static Minifier get(final String name) {
        notEmpty(name, "The name is required.");
        Minifier minifier = registry.get(name.toLowerCase());
        if (minifier == null) {
            throw new IllegalArgumentException("No minifier/optimizer found for: " + name);
        }
        return minifier;
    }

    /**
     * Register a new optimizer/minifier.
     *
     * @param name The optimizer/minifier name. Required.
     * @param minifier The optimizer/minifier.
     */
    public static void register(final String name, final Minifier minifier) {
        notEmpty(name, "The name is required.");
        notNull(minifier, "The minifier is required.");
        registry.put(name.toLowerCase(), minifier);
    }
}