org.alloy.metal.resource.ResourceInputStream.java Source code

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Here is the source code for org.alloy.metal.resource.ResourceInputStream.java

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/*
* #%L
* BroadleafCommerce Common Libraries
* %%
* Copyright (C) 2009 - 2013 Broadleaf Commerce
* %%
* 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.
* #L%
*/

package org.alloy.metal.resource;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;

import org.alloy.metal.collections.list._Lists;
import org.apache.commons.lang3.StringUtils;
import org.springframework.core.io.InputStreamResource;
import org.springframework.core.io.Resource;

import com.google.common.base.Throwables;

/**
* @author jfischer
*/
public class ResourceInputStream extends InputStream {

    private final InputStream is;
    private List<String> names = new ArrayList<String>(20);

    public ResourceInputStream(InputStream is, String name) {
        this.is = is;
        names.add(name);
    }

    public ResourceInputStream(InputStream is, String name, List<String> previousNames) {
        this.is = is;
        names.addAll(previousNames);
        if (!StringUtils.isEmpty(name)) {
            names.add(name);
        }
    }

    public List<String> getNames() {
        return names;
    }

    public String getName() {
        assert names.size() == 1;
        return names.get(0);
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder(100);
        int size = names.size();
        for (int j = 0; j < size; j++) {
            sb.append(names.get(j));
            if (j < size - 1) {
                sb.append(" : ");
            }
        }

        return sb.toString();
    }

    @Override
    public int available() throws IOException {
        return (is == null) ? -1 : is.available();
    }

    @Override
    public void close() throws IOException {
        is.close();
    }

    @Override
    public void mark(int i) {
        is.mark(i);
    }

    @Override
    public boolean markSupported() {
        return is.markSupported();
    }

    @Override
    public int read() throws IOException {
        return is.read();
    }

    @Override
    public int read(byte[] bytes) throws IOException {
        return is.read(bytes);
    }

    @Override
    public int read(byte[] bytes, int i, int i1) throws IOException {
        return is.read(bytes, i, i1);
    }

    @Override
    public void reset() throws IOException {
        is.reset();
    }

    @Override
    public long skip(long l) throws IOException {
        return is.skip(l);
    }

    public static Resource toResource(ResourceInputStream stream) {
        return _Lists.list(stream).map(InputStreamResource::new).singleStrict();
    }

    public static Function<Resource, ResourceInputStream> transformer() {
        return (resource) -> {
            try {
                return new ResourceInputStream(resource.getInputStream(), resource.getURL().getPath());
            } catch (IOException e) {
                throw Throwables.propagate(e);
            }
        };
    }
}