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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2009, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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.jboss.shrinkwrap.impl.base.asset;

import java.io.ByteArrayInputStream;
import java.io.InputStream;

import org.jboss.shrinkwrap.api.asset.Asset;
import org.jboss.shrinkwrap.impl.base.Validate;

/**
 * ServiceProviderAsset
 *
 * @author Aslak Knutsen
 * @version $Revision: $
 */
public class ServiceProviderAsset implements Asset {

    private final String[] providerImpls;

    /**
     * Creates a newline separated text file off the providerImpls class names.
     *
     * @param providerImpls
     *            The Classes to use
     * @throws IllegalArgumentException
     *             if providerImpls is null or contain null values
     */
    public ServiceProviderAsset(Class... providerImpls) {
        Validate.notNullAndNoNullValues(providerImpls,
            "ProviderImpls must be specified and can not contain null values");
        String[] names = new String[providerImpls.length];
        for (int i = 0; i < providerImpls.length; i++) {
           names[i] = providerImpls[i].getName();
        }
        this.providerImpls = names;
    }

    /**
     * Creates a newline separated text file off the providerImpls class names.
     *
     * @param providerImpls
     *            The class names to use
     * @throws IllegalArgumentException
     *             if providerImpls is null or contain null values
     */
    public ServiceProviderAsset(String... providerImpls) {
        Validate.notNullAndNoNullValues(providerImpls,
            "ProviderImpls must be specified and can not contain null values");
        this.providerImpls = providerImpls;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.jboss.shrinkwrap.api.Asset#openStream()
     */
    @Override
    public InputStream openStream() {
        StringBuilder content = new StringBuilder();
        for (String providerImpl : providerImpls) {
            content.append(providerImpl).append('\n');
        }
        return new ByteArrayInputStream(content.toString().getBytes());
    }
}