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package org.apidesign.bck2brwsr.dew;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.Reader;

import java.io.Writer;

/**

 *

 * @author Tomas Zeuzla

 */

class MemoryFileObject extends BaseFileObject {

    private byte[] content;

    private long lastModified;

    MemoryFileObject (

            String resourceName,

            Kind kind,

            byte[] content) {

        super(resourceName, kind);

        this.content = content;

        this.lastModified = this.content == null ?

            -1 :

            System.currentTimeMillis();

    }

    MemoryFileObject (

            String resourceName,

            byte[] content) {

        this(resourceName, getKind(resourceName) ,content);

    }

    @Override

    public InputStream openInputStream() throws IOException {

        if (content == null) {

            throw new IOException();

        } else {

            return new ByteArrayInputStream(content);

        }

    }

    @Override

    public OutputStream openOutputStream() throws IOException {

        return new CloseStream();

    }

    @Override

    public Reader openReader(boolean ignoreEncodingErrors) throws IOException {

        return new InputStreamReader(openInputStream());

    }

    @Override

    public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {

        if (content == null) {

            throw new IOException();

        } else {

            return new String(content);

        }

    }

    @Override

    public Writer openWriter() throws IOException {

        return new OutputStreamWriter(openOutputStream());

    }

    @Override

    public long getLastModified() {

        return lastModified;

    }

    @Override

    public boolean delete() {

        return false;

    }

    byte[] getContent() {

        return content;

    }

    private class CloseStream extends OutputStream {

        private final ByteArrayOutputStream delegate;

        CloseStream() {

            delegate = new ByteArrayOutputStream();

        }

        @Override

        public void write(int b) throws IOException {

            delegate.write(b);

        }

        @Override

        public void write(byte[] b) throws IOException {

            delegate.write(b);

        }

        @Override

        public void write(byte[] b, int off, int len) throws IOException {

            delegate.write(b, off, len);

        }

        @Override

        public void close() throws IOException {

            delegate.close();

            content = delegate.toByteArray();

            lastModified = System.currentTimeMillis();

        }                                    

    }

}