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A Java implementation of the JSON Schema specification.
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package xpertss.json.schema.library;

import com.github.fge.Thawed;
import com.github.fge.jackson.NodeType;
import xpertss.json.schema.core.keyword.syntax.checkers.SyntaxChecker;
import xpertss.json.schema.keyword.digest.Digester;
import xpertss.json.schema.keyword.digest.helpers.IdentityDigester;
import xpertss.json.schema.keyword.digest.helpers.SimpleDigester;
import xpertss.json.schema.keyword.validator.KeywordValidator;
import xpertss.json.schema.keyword.validator.KeywordValidatorFactory;
import xpertss.json.schema.keyword.validator.ReflectionKeywordValidatorFactory;
import xpertss.json.schema.messages.JsonSchemaConfigurationBundle;
import com.github.fge.msgsimple.bundle.MessageBundle;
import com.github.fge.msgsimple.load.MessageBundles;

/**
 * A keyword builder -- the thawed version of a {@link Keyword}
 *
 * Note that you may only supply a {@link SyntaxChecker} for a keyword, but
 * if you supply a validator class, the digester must also be present.
 * 
 */
public final class KeywordBuilder implements Thawed {

    private static final MessageBundle BUNDLE = MessageBundles.getBundle(JsonSchemaConfigurationBundle.class);
    final String name;
    SyntaxChecker syntaxChecker;
    Digester digester;
    KeywordValidatorFactory validatorFactory;

    /**
     * Create a new, empty keyword builder
     *
     * @param name the name of this keyword
     * @throws NullPointerException name is null
     * @see Keyword#newBuilder(String)
     */
    KeywordBuilder(String name)
    {
        BUNDLE.checkNotNull(name, "nullName");
        this.name = name;
    }

    /**
     * Create a thawed version of a frozen keyword
     *
     * @param keyword the keyword
     * @see Keyword#thaw()
     */
    KeywordBuilder(Keyword keyword)
    {
        name = keyword.name;
        syntaxChecker = keyword.syntaxChecker;
        digester = keyword.digester;
        validatorFactory = keyword.validatorFactory;
    }

    /**
     * Add a syntax checker to this builder
     *
     * @param syntaxChecker the syntax checker
     * @return this
     * @throws NullPointerException syntax checker is null
     */
    public KeywordBuilder withSyntaxChecker(SyntaxChecker syntaxChecker)
    {
        BUNDLE.checkNotNullPrintf(syntaxChecker, "nullSyntaxChecker", name);
        this.syntaxChecker = syntaxChecker;
        return this;
    }

    /**
     * Add a digester to this builder
     *
     * @param digester the digester
     * @return this
     * @throws NullPointerException digester is null
     */
    public KeywordBuilder withDigester(Digester digester)
    {
        BUNDLE.checkNotNullPrintf(digester, "nullDigester", name);
        this.digester = digester;
        return this;
    }

    /**
     * Set this keyword's digester to be an {@link IdentityDigester}
     *
     * @param first the first instance type supported by this keyword
     * @param other other instance types supported by this keyword
     * @return this
     * @throws NullPointerException one or more type(s) are null
     */
    public KeywordBuilder withIdentityDigester(NodeType first, NodeType... other)
    {
        digester = new IdentityDigester(name, checkType(first), checkTypes(other));
        return this;
    }

    /**
     * Set this keyword's digester to be a {@link SimpleDigester}
     *
     * @param first the first instance type supported by this keyword
     * @param other other instance types supported by this keyword
     * @return this
     * @throws NullPointerException one or more type(s) are null
     */
    public KeywordBuilder withSimpleDigester(NodeType first, NodeType... other)
    {
        digester = new SimpleDigester(name, checkType(first), checkTypes(other));
        return this;
    }

    /**
     * Set the validator class for this keyword
     *
     * @param c the class
     * @return this
     * @throws NullPointerException class is null
     * @throws IllegalArgumentException failed to find an appropriate
     * constructor
     */
    public KeywordBuilder withValidatorClass(Class c)
    {
        validatorFactory = new ReflectionKeywordValidatorFactory(name, c);
        return this;
    }

    /**
     * Set the validator factory for this keyword
     *
     * @param factory the factory
     * @return this
     */
    public KeywordBuilder withValidatorFactory(KeywordValidatorFactory factory)
    {
        validatorFactory = factory;
        return this;
    }

    /**
     * Build a frozen version of this builder
     *
     * @return a {@link Keyword}
     * @throws IllegalArgumentException no syntax checker; or a constructor has
     * been supplied without a digester
     * @see Keyword#Keyword(KeywordBuilder)
     */
    @Override
    public Keyword freeze()
    {
        BUNDLE.checkArgumentPrintf(syntaxChecker != null, "noChecker", name);
        /*
         * We can have a keyword without a validator; however, if there is one,
         * there must be a digester.
         */
        BUNDLE.checkArgumentPrintf(validatorFactory == null || digester != null, "malformedKeyword", name);
        return new Keyword(this);
    }

    private static NodeType checkType(NodeType type)
    {
        return BUNDLE.checkNotNull(type, "nullType");
    }

    private static NodeType[] checkTypes(NodeType... types)
    {
        for (final NodeType type: types)
            BUNDLE.checkNotNull(type, "nullType");
        return types;
    }
}