Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/ext/NioPathDeserializer.java

package com.fasterxml.jackson.databind.ext;

import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.FileSystemNotFoundException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.spi.FileSystemProvider;
import java.util.ServiceLoader;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer;

import static java.lang.Character.isLetter;

/**
 * @since 2.8
 */
public class NioPathDeserializer extends StdScalarDeserializer<Path>
{
    private static final long serialVersionUID = 1;

    private static final boolean areWindowsFilePathsSupported;
    static {
        boolean isWindowsRootFound = false;
        for (File file : File.listRoots()) {
            String path = file.getPath();
            if (path.length() >= 2 && isLetter(path.charAt(0)) && path.charAt(1) == ':') {
                isWindowsRootFound = true;
                break;
            }
        }
        areWindowsFilePathsSupported = isWindowsRootFound;
    }

    public NioPathDeserializer() { super(Path.class); }

    @Override
    public Path deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
        if (!p.hasToken(JsonToken.VALUE_STRING)) {
            return (Path) ctxt.handleUnexpectedToken(Path.class, p);
        }

        final String value = p.getText();

        // If someone gives us an input with no : at all, treat as local path, instead of failing
        // with invalid URI.
        if (value.indexOf(':') < 0) {
            return Paths.get(value);
        }

        if (areWindowsFilePathsSupported) {
            if (value.length() >= 2 && isLetter(value.charAt(0)) && value.charAt(1) == ':') {
                return Paths.get(value);
            }
        }

        final URI uri;
        try {
            uri = new URI(value);
        } catch (URISyntaxException e) {
            return (Path) ctxt.handleInstantiationProblem(handledType(), value, e);
        }
        try {
            return Paths.get(uri);
        } catch (FileSystemNotFoundException cause) {
            try {
                final String scheme = uri.getScheme();
                // We want to use the current thread's context class loader, not system class loader that is used in Paths.get():
                for (FileSystemProvider provider : ServiceLoader.load(FileSystemProvider.class)) {
                    if (provider.getScheme().equalsIgnoreCase(scheme)) {
                        return provider.getPath(uri);
                    }
                }
                return (Path) ctxt.handleInstantiationProblem(handledType(), value, cause);
            } catch (Throwable e) {
                e.addSuppressed(cause);
                return (Path) ctxt.handleInstantiationProblem(handledType(), value, e);
            }
        } catch (Throwable e) {
            return (Path) ctxt.handleInstantiationProblem(handledType(), value, e);
        }
    }
}

⏎ com/fasterxml/jackson/databind/ext/NioPathDeserializer.java

 

⇒ Jackson Annotations Source Code

⇐ Download and Install Jackson Binary Package

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library