gradle-master/subprojects/core/src/main/java/org/gradle/api/internal/file/MaybeCompressedFileResource.java
/*
 * Copyright 2011 the original author or authors.
 *
 * 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 org.gradle.api.internal.file;

import org.apache.commons.io.FilenameUtils;
import org.gradle.api.internal.file.archive.compression.Bzip2Archiver;
import org.gradle.api.internal.file.archive.compression.CompressedReadableResource;
import org.gradle.api.internal.file.archive.compression.GzipArchiver;
import org.gradle.api.resources.MissingResourceException;
import org.gradle.api.resources.ReadableResource;
import org.gradle.api.resources.internal.ReadableResourceInternal;
import org.gradle.api.tasks.bundling.Compression;

import java.io.File;
import java.io.InputStream;
import java.net.URI;

public class MaybeCompressedFileResource implements ReadableResourceInternal {

    private final ReadableResourceInternal resource;

    public MaybeCompressedFileResource(ReadableResourceInternal resource) {
        if (resource instanceof CompressedReadableResource) {
            // Already in something to uncompress it
            this.resource = resource;
        } else {
            String ext = FilenameUtils.getExtension(resource.getURI().toString());

            if (Compression.BZIP2.getSupportedExtensions().contains(ext)) {
                this.resource = new Bzip2Archiver(resource);
            } else if (Compression.GZIP.getSupportedExtensions().contains(ext)) {
                this.resource = new GzipArchiver(resource);
            } else {
                // Unrecognized extension
                this.resource = resource;
            }
        }
    }

    @Override
    public InputStream read() throws MissingResourceException {
        return resource.read();
    }

    public ReadableResource getResource() {
        return resource;
    }

    @Override
    public String getDisplayName() {
        return resource.getDisplayName();
    }

    @Override
    public URI getURI() {
        return resource.getURI();
    }

    @Override
    public String getBaseName() {
        return resource.getBaseName();
    }

    @Override
    public File getBackingFile() {
        return resource.getBackingFile();
    }
}
