Jackson Core Source Code

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

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

You can also browse Jackson Core Source Code below:

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com/fasterxml/jackson/core/TokenStreamFactory.java

package com.fasterxml.jackson.core;

import java.io.*;
import java.net.URL;

import com.fasterxml.jackson.core.io.DataOutputAsStream;

/**
 * Intermediate base class for actual format-specific factories for constructing
 * parsers (reading) and generators (writing). Although full power will only be
 * available with Jackson 3, skeletal implementation added in 2.10 to help conversion
 * of code for 2.x to 3.x migration of projects depending on Jackson
 *
 * @since 2.10
 */
public abstract class TokenStreamFactory
    implements Versioned,
    java.io.Serializable
{
    private static final long serialVersionUID = 2;

    /*
    /**********************************************************
    /* Capability introspection
    /**********************************************************
     */

    /**
     * Introspection method that higher-level functionality may call
     * to see whether underlying data format requires a stable ordering
     * of object properties or not.
     * This is usually used for determining
     * whether to force a stable ordering (like alphabetic ordering by name)
     * if no ordering if explicitly specified.
     *<p>
     * Default implementation returns <code>false</code> as JSON does NOT
     * require stable ordering. Formats that require ordering include positional
     * textual formats like <code>CSV</code>, and schema-based binary formats
     * like <code>Avro</code>.
     *
     * @return Whether format supported by this factory
     *   requires Object properties to be ordered.
     */
    public abstract boolean requiresPropertyOrdering();

    /**
     * Introspection method that higher-level functionality may call
     * to see whether underlying data format can read and write binary
     * data natively; that is, embeded it as-is without using encodings
     * such as Base64.
     *<p>
     * Default implementation returns <code>false</code> as JSON does not
     * support native access: all binary content must use Base64 encoding.
     * Most binary formats (like Smile and Avro) support native binary content.
     *
     * @return Whether format supported by this factory
     *    supports native binary content
     */
    public abstract boolean canHandleBinaryNatively();

    /**
     * Introspection method that can be used to check whether this
     * factory can create non-blocking parsers: parsers that do not
     * use blocking I/O abstractions but instead use a
     * {@link com.fasterxml.jackson.core.async.NonBlockingInputFeeder}.
     *
     * @return Whether this factory supports non-blocking ("async") parsing or
     *    not (and consequently whether {@code createNonBlockingXxx()} method(s) work)
     */
    public abstract boolean canParseAsync();

    /**
     * Method for accessing kind of {@link FormatFeature} that a parser
     * {@link JsonParser} produced by this factory would accept, if any;
     * <code>null</code> returned if none.
     *
     * @return Type of format-specific stream read features, if any; {@code null} if none
     *
     * @since 2.6
     */
    public abstract Class<? extends FormatFeature> getFormatReadFeatureType();

    /**
     * Method for accessing kind of {@link FormatFeature} that a parser
     * {@link JsonGenerator} produced by this factory would accept, if any;
     * <code>null</code> returned if none.
     *
     * @return Type of format-specific stream read features, if any; {@code null} if none
     *
     * @since 2.6
     */
    public abstract Class<? extends FormatFeature> getFormatWriteFeatureType();

    /*
    /**********************************************************
    /* Format detection functionality
    /**********************************************************
     */

    /**
     * Method that can be used to quickly check whether given schema
     * is something that parsers and/or generators constructed by this
     * factory could use. Note that this means possible use, at the level
     * of data format (i.e. schema is for same data format as parsers and
     * generators this factory constructs); individual schema instances
     * may have further usage restrictions.
     *
     * @param schema Schema instance to check
     *
     * @return Whether parsers and generators constructed by this factory
     *   can use specified format schema instance
     *
     * @since 2.1
     */
    public abstract boolean canUseSchema(FormatSchema schema);

    /**
     * Method that returns short textual id identifying format
     * this factory supports.
     *
     * @return Name of the format handled by parsers, generators this factory creates
     */
    public abstract String getFormatName();

    /*
    /**********************************************************
    /* Configuration access
    /**********************************************************
     */

    public abstract boolean isEnabled(JsonParser.Feature f);
    public abstract boolean isEnabled(JsonGenerator.Feature f);

    public abstract int getParserFeatures();
    public abstract int getGeneratorFeatures();

    public abstract int getFormatParserFeatures();
    public abstract int getFormatGeneratorFeatures();

    /*
    /**********************************************************
    /* Factory methods, parsers
    /**********************************************************
     */

    public abstract JsonParser createParser(byte[] data) throws IOException;
    public abstract JsonParser createParser(byte[] data, int offset, int len) throws IOException;
    public abstract JsonParser createParser(char[] content) throws IOException;
    public abstract JsonParser createParser(char[] content, int offset, int len) throws IOException;
    public abstract JsonParser createParser(DataInput in) throws IOException;
    public abstract JsonParser createParser(File f) throws IOException;
    public abstract JsonParser createParser(InputStream in) throws IOException;
    public abstract JsonParser createParser(Reader r) throws IOException;
    public abstract JsonParser createParser(String content) throws IOException;
    public abstract JsonParser createParser(URL url) throws IOException;

    public abstract JsonParser createNonBlockingByteArrayParser() throws IOException;

    /*
    /**********************************************************
    /* Factory methods, generators
    /**********************************************************
     */

    public abstract JsonGenerator createGenerator(DataOutput out, JsonEncoding enc) throws IOException;
    public abstract JsonGenerator createGenerator(DataOutput out) throws IOException;
    public abstract JsonGenerator createGenerator(File f, JsonEncoding enc) throws IOException;
    public abstract JsonGenerator createGenerator(OutputStream out) throws IOException;
    public abstract JsonGenerator createGenerator(OutputStream out, JsonEncoding enc) throws IOException;
    public abstract JsonGenerator createGenerator(Writer w) throws IOException;

    /*
    /**********************************************************
    /* Internal factory methods, other
    /**********************************************************
     */

    protected OutputStream _createDataOutputWrapper(DataOutput out) {
        return new DataOutputAsStream(out);
    }
    /**
     * Helper methods used for constructing an optimal stream for
     * parsers to use, when input is to be read from an URL.
     * This helps when reading file content via URL.
     *
     * @param url Source to read content to parse from
     *
     * @return InputStream constructed for given {@link URL}
     *
     * @throws IOException If there is a problem accessing content from specified {@link URL}
     */
    protected InputStream _optimizedStreamFromURL(URL url) throws IOException {
        if ("file".equals(url.getProtocol())) {
            /* Can not do this if the path refers
             * to a network drive on windows. This fixes the problem;
             * might not be needed on all platforms (NFS?), but should not
             * matter a lot: performance penalty of extra wrapping is more
             * relevant when accessing local file system.
             */
            String host = url.getHost();
            if (host == null || host.length() == 0) {
                // [core#48]: Let's try to avoid probs with URL encoded stuff
                String path = url.getPath();
                if (path.indexOf('%') < 0) {
                    return new FileInputStream(url.getPath());

                }
                // otherwise, let's fall through and let URL decoder do its magic
            }
        }
        return url.openStream();
    }
}

com/fasterxml/jackson/core/TokenStreamFactory.java

 

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2016-02-03, 29615👍, 1💬