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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.

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/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2017 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

package org.scijava.annotations;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.scijava.annotations.legacy.LegacyReader;

/**
 * Reads indexed annotations in JSON format.
 * 

 * Example: an annotation {@code @Simple(string1 = "World")} to the
 * {@code Annotated} class would be serialized as
 * 
 * 
 * {
 *     "class":"Annotated",
 *     "values":{
 *         "string1":"World"
 *     }
 * }
 * 

 * 
 * 

 * 
 * @author Johannes Schindelin
 */
class IndexReader {

	private final PushbackInputStream in;
	private final String originalISName;

	IndexReader(final InputStream in) {
		this(in, "");
	}

	IndexReader(final InputStream in, final String isName) {
		this.in =
			in instanceof PushbackInputStream ? (PushbackInputStream) in
				: new PushbackInputStream(new BufferedInputStream(in));
		this.originalISName = isName;
	}

	public Object next() throws IOException {
		int c = in.read();
		while (Character.isWhitespace(c)) c = in.read();
		if (c < 0) {
			return null;
		}
		if (c == '{') {
			Map map = new LinkedHashMap<>();
			for (;;) {
				if (expect('"', '}') == 1) {
					return map;
				}
				String key = readString();
				expect(':');
				Object value = next();
				map.put(key, value);
				if (expect(',', '}') == 1) {
					return map;
				}
			}
		}
		if (c == '[') {
			List list = new ArrayList<>();
			c = in.read();
			if (c == ']') {
				return list;
			}
			in.unread(c);
			for (;;) {
				Object value = next();
				list.add(value);
				if (expect(',', ']') == 1) {
					return list;
				}
			}
		}
		if (c == 't') {
			expect("rue");
			return true;
		}
		if (c == 'f') {
			expect("alse");
			return false;
		}
		if (c == 'n') {
			expect("ull");
			throw new IOException("Invalid stream: contains null");
		}
		if (c == '.' || c == '-' || (c >= '0' && c <= '9')) {
			boolean isInteger = true;
			StringBuilder builder = new StringBuilder();
			for (;;) {
				builder.append((char) c);
				c = in.read();
				if (c == '.' || c == 'e' || c == 'E') {
					isInteger = false;
				}
				else if (c < '0' || c > '9') {
					in.unread(c);
					break;
				}
			}
			c = in.read();
			if (c == 'I' && "-".equals(builder.toString())) {
				expect("nfinity");
				return Double.NEGATIVE_INFINITY;
			}
			in.unread(c);
			if (isInteger) {
				return Long.parseLong(builder.toString());
			}
			return (double) Double.parseDouble(builder.toString());
		}
		if (c == 'I') {
			expect("nfinity");
			return Double.POSITIVE_INFINITY;
		}
		if (c == 'N') {
			expect("aN");
			return Double.NaN;
		}
		if (c == '"') {
			return readString();
		}
		throw new IOException("Unexpected char: '" + (char) c + "'"+
				((originalISName.length()>0) ? " from "+originalISName : ""));
	}

	public void close() throws IOException {
		in.close();
	}

	private String readString() throws IOException {
		StringBuilder builder = new StringBuilder();
		for (;;) {
			int c = in.read();
			if (c == '"') {
				return builder.toString();
			}
			builder.append((char) readCharacter(c));
		}
	}

	private int readCharacter(int first) throws IOException {
		int c = first;
		if (c == '\\') {
			c = in.read();
			if (c == 'u') {
				String hex =
					"" + ((char) in.read()) + ((char) in.read()) + ((char) in.read()) +
						((char) in.read());
				c = Integer.parseInt(hex, 16);
			}
			else if (c != '\\' && c != '"') {
				throw new IOException("Expected '\"' or '\\', got '" + c + "'");
			}
		}
		return c;
	}

	private void expect(char expect) throws IOException {
		int c = in.read();
		if (c != expect) {
			throw new IOException("Expected '" + expect + "', got '" + (char) c + "'");
		}
	}

	private int expect(char a, char b) throws IOException {
		int c = in.read();
		if (c == a) {
			return 0;
		}
		if (c == b) {
			return 1;
		}
		throw new IOException("Expected '" + a + "' or '" + b + "', got '" +
			(char) c + "'"+((originalISName.length()>0) ? " from "+originalISName : ""));
	}

	private void expect(String match) throws IOException {
		for (char c : match.toCharArray()) {
			expect(c);
		}
	}

	private IndexReader() {
		this.in = null;
		this.originalISName="";
	}

	static IndexReader getLegacyReader(final InputStream in) throws IOException {
		final LegacyReader legacy = new LegacyReader(in);
		return new IndexReader() {

			@Override
			public Object next() throws IOException {
				return legacy.readObject();
			}

			@Override
			public void close() throws IOException {
				legacy.close();
			}
		};
	}
}
 















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