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package liquibase.resource;

import liquibase.AbstractExtensibleObject;
import liquibase.Scope;
import liquibase.util.StringUtil;

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

/**
 * Convenience base class for {@link ResourceAccessor} implementations.
 */
public abstract class AbstractResourceAccessor extends AbstractExtensibleObject implements ResourceAccessor {

    @Override
    @java.lang.SuppressWarnings("squid:S2095")
    public InputStream openStream(String relativeTo, String streamPath) throws IOException {
        InputStreamList streamList = this.openStreams(relativeTo, streamPath);

        if (streamList == null || streamList.size() == 0) {
            return null;
        } else if (streamList.size() > 1) {
            streamList.close();
            Scope.getCurrentScope().getLog(getClass()).warning("ResourceAccessor roots: "+Scope.getCurrentScope().getResourceAccessor().getClass().getName());
            throw new IOException("Found " + streamList.size() + " files that match " + streamPath+": "+ StringUtil.join(streamList.getURIs(), ", ", new StringUtil.ToStringFormatter()));
        } else {
            return streamList.iterator().next();
        }
    }
}