com.liferay.compat.hook.webdav.CompatResourceInvocationHandler.java Source code

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Here is the source code for com.liferay.compat.hook.webdav.CompatResourceInvocationHandler.java

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/**
 * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.compat.hook.webdav;

import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;
import com.liferay.portal.kernel.repository.model.FileEntry;
import com.liferay.portal.kernel.repository.model.FileVersion;
import com.liferay.portal.kernel.webdav.Resource;
import com.liferay.portal.kernel.webdav.WebDAVException;

import java.io.InputStream;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * @author Brian Wing Shun Chan
 */
public class CompatResourceInvocationHandler implements InvocationHandler {

    public CompatResourceInvocationHandler(Resource resource) {
        _resource = resource;

        try {
            Class<?> clazz = resource.getClass();

            Field field = clazz.getDeclaredField("_fileEntry");

            field.setAccessible(true);

            _fileEntry = (FileEntry) field.get(resource);
        } catch (Exception e) {
            _log.error(e, e);
        }
    }

    public Object invoke(Object proxy, Method method, Object[] arguments) throws Throwable {

        try {
            if (_fileEntry == null) {
                return method.invoke(_resource, arguments);
            }

            String methodName = method.getName();

            if (methodName.equals("getContentAsStream")) {
                return getContentAsStream();
            } else if (methodName.equals("getContentType")) {
                return getContentType();
            } else if (methodName.equals("getSize")) {
                return getSize();
            }

            return method.invoke(_resource, arguments);
        } catch (InvocationTargetException ite) {
            throw ite.getTargetException();
        }
    }

    protected InputStream getContentAsStream() throws WebDAVException {
        try {
            FileVersion fileVersion = _fileEntry.getLatestFileVersion();

            return fileVersion.getContentStream(false);
        } catch (Exception e) {
            throw new WebDAVException(e);
        }
    }

    protected String getContentType() {
        try {
            FileVersion fileVersion = _fileEntry.getLatestFileVersion();

            return fileVersion.getMimeType();
        } catch (Exception e) {
            return _fileEntry.getMimeType();
        }
    }

    protected long getSize() {
        try {
            FileVersion fileVersion = _fileEntry.getLatestFileVersion();

            return fileVersion.getSize();
        } catch (Exception e) {
            return _fileEntry.getSize();
        }
    }

    private static Log _log = LogFactoryUtil.getLog(CompatResourceInvocationHandler.class);

    private FileEntry _fileEntry;
    private Resource _resource;

}