com.formkiq.core.util.Resources.java Source code

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Here is the source code for com.formkiq.core.util.Resources.java

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/*
 * Copyright (C) 2017 FormKiQ 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.formkiq.core.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.io.IOUtils;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.util.StringUtils;

/**
 * Class for finding Resource(s).
 *
 */
public final class Resources {

    /**
     * Gets a file from classpath as bytes.
     * @param file String
     * @return byte[]
     * @throws IOException IOException
     */
    public static byte[] getResourceAsBytes(final String file) throws IOException {
        InputStream is = getResourceAsInputStream(file);
        try {
            byte[] bytes = IOUtils.toByteArray(is);
            return bytes;
        } finally {
            IOUtils.closeQuietly(is);
        }
    }

    /**
     * Gets a file from classpath as bytes.
     * @param file {@link String}
     * @return {@link String}
     * @throws IOException IOException
     */
    public static InputStream getResourceAsInputStream(final String file) throws IOException {

        InputStream is = null;
        Resource resource = new ClassPathResource(file);

        try {
            is = resource.getInputStream();
        } catch (FileNotFoundException e) {

            // check for file in tomcat conf directory
            String catalinabase = System.getProperty("catalina.base");

            if (StringUtils.hasText(catalinabase)) {
                File configDir = new File(catalinabase, "conf");
                File configFile = new File(configDir, file);

                if (configFile.exists()) {
                    is = new FileInputStream(configFile);
                }
            }
        }

        return is;
    }

    /**
     * Gets a file from classpath as bytes.
     * @param file {@link String}
     * @return {@link String}
     * @throws IOException IOException
     */
    public static String getResourceAsString(final String file) throws IOException {
        InputStream is = getResourceAsInputStream(file);

        if (is == null) {
            throw new FileNotFoundException(file);
        }

        try {
            byte[] bytes = IOUtils.toByteArray(is);
            String s = Strings.toString(bytes);
            return s;
        } finally {
            IOUtils.closeQuietly(is);
        }
    }

    /**
     * private constructor.
     */
    private Resources() {
    }
}