192 lines
5.8 KiB
Java
192 lines
5.8 KiB
Java
/*
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* This file is part of Player Analytics (Plan).
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*
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* Plan is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License v3 as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Plan is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Plan. If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.djrapitops.plan.delivery.web.resource;
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import java.io.*;
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import java.nio.charset.StandardCharsets;
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import java.util.Optional;
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import java.util.function.Supplier;
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/**
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* Represents a customizable resource.
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* <p>
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* You can use the create methods for simple resources when using {@link com.djrapitops.plan.delivery.web.ResourceService}.
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* <p>
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* It is assumed that any text based files are encoded in UTF-8.
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*
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* @author AuroraLS3
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*/
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public interface WebResource {
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/**
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* Create a new WebResource from byte array.
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*
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* @param content Bytes of the resource.
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* @return WebResource.
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*/
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static WebResource create(byte[] content) {
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return new ByteResource(content);
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}
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/**
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* Create a new WebResource from an UTF-8 String.
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*
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* @param utf8String String in UTF-8 encoding.
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* @return WebResource.
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*/
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static WebResource create(String utf8String) {
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return new ByteResource(utf8String.getBytes(StandardCharsets.UTF_8));
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}
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/**
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* Creates a new WebResource from an InputStream.
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*
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* @param in InputStream for the resource, closed after inside the method.
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* @return WebResource.
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* @throws IOException If the stream can not be read.
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*/
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static WebResource create(InputStream in) throws IOException {
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return create(in, null);
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}
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/**
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* Creates a new WebResource from an InputStream.
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*
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* @param in InputStream for the resource, closed after inside the method.
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* @param lastModified Epoch millisecond the resource was last modified
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* @return WebResource.
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* @throws IOException If the stream can not be read.
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*/
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static WebResource create(InputStream in, Long lastModified) throws IOException {
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try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
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int read;
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byte[] bytes = new byte[1024];
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while ((read = in.read(bytes)) != -1) {
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out.write(bytes, 0, read);
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}
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return new ByteResource(out.toByteArray(), lastModified);
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} finally {
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in.close();
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}
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}
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/**
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* Create a lazy WebResource that only reads contents if necessary.
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*
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* @param in Supplier for InputStream, a lazy method that reads input when necessary.
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* @param lastModified Last modified date for the resource.
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* @return WebResource.
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*/
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static WebResource create(Supplier<InputStream> in, Long lastModified) {
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return new LazyWebResource(in, () -> {
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try (ByteArrayOutputStream out = new ByteArrayOutputStream();
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InputStream input = in.get()) {
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int read;
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byte[] bytes = new byte[1024];
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while ((read = input.read(bytes)) != -1) {
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out.write(bytes, 0, read);
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}
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return out.toByteArray();
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} catch (IOException e) {
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throw new UncheckedIOException(e);
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}
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}, lastModified);
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}
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byte[] asBytes();
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/**
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* Return the resource as a UTF-8 String.
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*
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* @return The resource in UTF-8.
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*/
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String asString();
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InputStream asStream();
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default Optional<Long> getLastModified() {
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return Optional.empty();
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}
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final class ByteResource implements WebResource {
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private final byte[] content;
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private final Long lastModified;
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public ByteResource(byte[] content) {
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this(content, null);
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}
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public ByteResource(byte[] content, Long lastModified) {
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this.content = content;
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this.lastModified = lastModified;
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}
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@Override
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public byte[] asBytes() {
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return content;
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}
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@Override
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public String asString() {
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return new String(content, StandardCharsets.UTF_8);
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}
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@Override
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public InputStream asStream() {
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return new ByteArrayInputStream(content);
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}
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@Override
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public Optional<Long> getLastModified() {
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return Optional.ofNullable(lastModified);
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}
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}
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final class LazyWebResource implements WebResource {
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private final Supplier<InputStream> inputStreamSupplier;
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private final Supplier<byte[]> contentSupplier;
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private final Long lastModified;
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public LazyWebResource(Supplier<InputStream> inputStreamSupplier, Supplier<byte[]> contentSupplier, Long lastModified) {
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this.inputStreamSupplier = inputStreamSupplier;
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this.contentSupplier = contentSupplier;
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this.lastModified = lastModified;
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}
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@Override
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public byte[] asBytes() {
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return contentSupplier.get();
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}
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@Override
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public String asString() {
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return new String(asBytes(), StandardCharsets.UTF_8);
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}
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@Override
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public InputStream asStream() {
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return inputStreamSupplier.get();
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}
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@Override
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public Optional<Long> getLastModified() {
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return Optional.ofNullable(lastModified);
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}
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}
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} |