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Servlet-specific additions allowing one to more easily deploy the Stormpath SDK in a servlet-container-based web application.

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/*
 * Copyright 2015 Stormpath, Inc.
 *
 * 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 com.stormpath.sdk.servlet.io;

import com.stormpath.sdk.impl.io.AbstractResource;
import com.stormpath.sdk.lang.Assert;

import javax.servlet.ServletContext;
import java.io.IOException;
import java.io.InputStream;

/**
 * @since 1.0.RC3
 */
public class ServletContextResource extends AbstractResource {

    public static final String SCHEME = "servletContext";

    private final ServletContext servletContext;

    public ServletContextResource(String location, ServletContext servletContext) {
        super(qualify(location));
        Assert.notNull(servletContext, "servletContext argument cannot be null.");
        this.servletContext = servletContext;
    }

    @Override
    protected String canonicalize(String input) {
        return qualify(super.canonicalize(input));
    }

    private static String qualify(String location) {
        if (location != null && !location.startsWith("/")) {
            return "/" + location;
        }
        return location;
    }

    @Override
    protected String getScheme() {
        return SCHEME;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return servletContext.getResourceAsStream(getLocation());
    }
}