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/*
 * Copyright 2017 ~ 2025 the original author or authors. James Wong 
 *
 * 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.wl4g.infra.common.resource;

/**
 * Retention of upstream license agreement statement:

 * Thank you very much spring framework, We fully comply with and support the open license
 * agreement of spring. The purpose of migration is to solve the problem
 * that these elegant API programs can still be easily used without running
 * in the spring environment.
 * 

 * Copyright 2002-2017 the original author or authors.
 *
 * 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.
 */
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;

import com.wl4g.infra.common.lang.Assert2;

/**
 * JBoss VFS based {@link StreamResource} implementation.
 *
 * 
 * As of Spring 4.0, this class supports VFS 3.x on JBoss AS 6+ (package
 * {@code org.jboss.vfs}) and is in particular compatible with JBoss AS 7 and
 * WildFly 8.
 *
 * @author Ales Justin
 * @author Juergen Hoeller
 * @author Costin Leau
 * @author Sam Brannen
 * @since 3.0
 * @see org.jboss.vfs.VirtualFile
 */
public class VfsStreamResource extends AbstractStreamResource {

    private final Object resource;

    public VfsStreamResource(Object resource) {
        Assert2.notNull(resource, "VirtualFile must not be null");
        this.resource = resource;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return VfsUtils2.getInputStream(this.resource);
    }

    @Override
    public boolean exists() {
        return VfsUtils2.exists(this.resource);
    }

    @Override
    public boolean isReadable() {
        return VfsUtils2.isReadable(this.resource);
    }

    @Override
    public URL getURL() throws IOException {
        try {
            return VfsUtils2.getURL(this.resource);
        } catch (Exception ex) {
            throw new IllegalArgumentException("Failed to obtain URL for file " + this.resource, ex);
        }
    }

    @Override
    public URI getURI() throws IOException {
        try {
            return VfsUtils2.getURI(this.resource);
        } catch (Exception ex) {
            throw new IllegalArgumentException("Failed to obtain URI for " + this.resource, ex);
        }
    }

    @Override
    public File getFile() throws IOException {
        return VfsUtils2.getFile(this.resource);
    }

    @Override
    public long contentLength() throws IOException {
        return VfsUtils2.getSize(this.resource);
    }

    @Override
    public long lastModified() throws IOException {
        return VfsUtils2.getLastModified(this.resource);
    }

    @Override
    public StreamResource createRelative(String relativePath) throws IOException {
        if (!relativePath.startsWith(".") && relativePath.contains("/")) {
            try {
                return new VfsStreamResource(VfsUtils2.getChild(this.resource, relativePath));
            } catch (IOException ex) {
                // fall back to getRelative
            }
        }

        return new VfsStreamResource(VfsUtils2.getRelative(new URL(getURL(), relativePath)));
    }

    @Override
    public String getFilename() {
        return VfsUtils2.getName(this.resource);
    }

    @Override
    public String getDescription() {
        return "VFS resource [" + this.resource + "]";
    }

    @Override
    public boolean equals(Object obj) {
        return (obj == this || (obj instanceof VfsStreamResource && this.resource.equals(((VfsStreamResource) obj).resource)));
    }

    @Override
    public int hashCode() {
        return this.resource.hashCode();
    }

}