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Closure Stylesheets is an extension to CSS that adds variables, functions, conditionals, and mixins to standard CSS. The tool also supports minification, linting, RTL flipping, and CSS class renaming.

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/*
 * Copyright 2008 Google Inc.
 *
 * 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.google.common.css;

import com.google.common.base.Preconditions;

import javax.annotation.Nullable;

/**
 * This is a wrapper for a file that will be compiled. It conveniently stores
 * both the file name and the file contents, so that the parser does not have
 * to deal with IO.
 *
 * Instances of this class are immutable.
 */
public final class SourceCode {
    private final String fileName;
    private final String fileContents;

    /**
     * Constructs a {@code SourceCode}. At least one of fileName and fileContents
     * must be non-{@code null}.
     *
     * @param fileName     the name of the source code file or {@code null} if the
     *                     input does not come from a file
     * @param fileContents the contents of the source code file or {@code null} if
     *                     the file contents is not yet known (the file has not yet been read)
     */
    public SourceCode(@Nullable String fileName, @Nullable String fileContents) {
        Preconditions.checkArgument(fileName != null || fileContents != null);
        this.fileName = fileName;
        this.fileContents = fileContents;
    }

    public String getFileName() {
        return fileName;
    }

    public String getFileContents() {
        return fileContents;
    }

    int getFileContentsLength() {
        return fileContents.length();
    }
}