org.apache.maven.index.reader.resource.UrlResource Maven / Gradle / Ivy

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Indexer Reader is a dependency-less library that is able to read published (remote) index with incremental update support, making usable to integrate published Maven Indexes into any engine without depending on maven-indexer-core and its transitive dependencies.

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package org.apache.maven.index.reader.resource;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Objects;

import org.apache.maven.index.reader.ResourceHandler.Resource;

/**
 * A {@link Resource} that represents a {@link URL}.
 */
public class UrlResource implements Resource
{
    private final URL url;

    public UrlResource( URL url )
    {
        Objects.requireNonNull( url, "url cannot be null" );
        this.url = url;
    }

    @Override
    public InputStream read() throws IOException
    {
        try
        {
            return url.openStream();
        }
        catch ( FileNotFoundException e )
        {
            return null;
        }
    }
}