org.jclouds.io.CopyInputStreamIntoSupplier.java Source code

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Here is the source code for org.jclouds.io.CopyInputStreamIntoSupplier.java

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/*
 * 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.
 */
package org.jclouds.io;

import java.io.IOException;
import java.io.InputStream;

import javax.annotation.Resource;

import org.jclouds.logging.Logger;

import com.google.common.annotations.Beta;
import com.google.common.base.Function;
import com.google.common.io.ByteStreams;
import com.google.common.io.Closeables;
import com.google.common.io.InputSupplier;

/**
 * 
 * @author Adrian Cole
 */
@Beta
public class CopyInputStreamIntoSupplier implements Function<InputStream, InputSupplier<InputStream>> {
    @Resource
    protected Logger logger = Logger.NULL;

    @SuppressWarnings("unchecked")
    @Override
    public InputSupplier<InputStream> apply(InputStream from) {
        if (from == null)
            return new InputSupplier<InputStream>() {

                @Override
                public InputStream getInput() throws IOException {
                    return null;
                }

            };
        try {
            return InputSupplier.class.cast(ByteStreams.newInputStreamSupplier(ByteStreams.toByteArray(from)));
        } catch (Exception e) {
            logger.warn(e, "ignoring problem retrieving credentials");
            return null;
        } finally {
            Closeables.closeQuietly(from);
        }
    }
}