com.github.fge.jsonschema.main.JsonSchemaFactory Maven / Gradle / Ivy
/*
* Copyright (c) 2012, Francis Galiegue
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Lesser GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Lesser GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see You can create a factory with all default settings using {@link
* JsonSchemaFactory#defaultFactory()}. This is what you will do in the vast
* majority of cases.
*
* If you want to customize it, you need to go through {@link
* JsonSchemaFactory.Builder}.
*
* This class is thread safe and immutable.
*
* @see JsonSchema
* @see com.github.fge.jsonschema.examples
*/
public final class JsonSchemaFactory
{
/**
* Schema registry
*/
private final SchemaRegistry registry;
/**
* Default schema URI
*/
private final JsonRef defaultSchemaURI;
/**
* Map of schema URIs and validator caches
*/
private final Map validatorCaches;
/**
* Build a factory with all default settings
*
* @return a schema factory instance
*/
public static JsonSchemaFactory defaultFactory()
{
return new Builder().build();
}
public static Builder builder()
{
return new Builder();
}
/**
* Constructor, private by design
*
* @see JsonSchemaFactory.Builder
* @param builder the builder
*/
private JsonSchemaFactory(final Builder builder)
{
registry = new SchemaRegistry(builder.uriManager, builder.namespace,
builder.addressingMode);
registry.addBundle(builder.bundle);
defaultSchemaURI = builder.defaultSchemaURI;
final ImmutableMap.Builder cacheBuilder
= ImmutableMap.builder();
final Map map = builder.metaSchemas;
JsonRef ref;
JsonValidatorCache validatorCache;
for (final Map.Entry entry: map.entrySet()) {
ref = entry.getKey();
validatorCache = new JsonValidatorCache(entry.getValue(), registry);
cacheBuilder.put(ref, validatorCache);
}
validatorCaches = cacheBuilder.build();
}
/**
* Create a schema instance from a JSON Schema, at a certain path
*
* For instance, if you submit this schema:
*
*
* {
* "schema1": { ... },
* "schema2": { ... }
* }
*
*
* then you can create a validator for {@code schema1} using:
*
*
* final JsonSchema schema = factory.create(schema, "#/schema1");
*
*
* The path can be a {@link JsonPointer} as above, but also an id
* reference.
*
* @see JsonFragment
*
* @param schema the schema
* @param path the pointer/id reference into the schema
* @return a {@link JsonSchema} instance
*/
public JsonSchema fromSchema(final JsonNode schema, final String path)
{
final SchemaContext schemaContext = registry.register(schema);
final JsonNode subSchema = JsonFragment.fromFragment(path)
.resolve(schemaContext.getSchema());
return createSchema(schemaContext, subSchema);
}
/**
* Create a schema instance from a JSON Schema
*
* This calls {@link #fromSchema(JsonNode, String)} with {@code ""} as
* a path.
*
* @param schema the schema
* @return a {@link JsonSchema} instance
*/
public JsonSchema fromSchema(final JsonNode schema)
{
return fromSchema(schema, "");
}
/**
* Create a schema instance from a JSON Schema located at a given URI, and
* at a given path
*
* This allows you, for instance, to load a schema using HTTP. Or, in
* fact, any other URI scheme that is supported.
*
* @see URIManager
* @see SchemaRegistry
*
* @param uri the URI
* @param path the JSON Pointer/id reference into the downloaded schema
* @return a {@link JsonSchema} instance
* @throws JsonSchemaException unable to get content from that URI
*/
public JsonSchema fromURI(final URI uri, final String path)
throws JsonSchemaException
{
final SchemaContext schemaContext = registry.get(uri);
final JsonNode subSchema = JsonFragment.fromFragment(path)
.resolve(schemaContext.getSchema());
return createSchema(schemaContext, subSchema);
}
/**
* Create a schema instance from a JSON Schema located at a given URI
*
* @see #fromSchema(JsonNode, String)
*
* @param uri the URI
* @return a {@link JsonSchema} instance
* @throws JsonSchemaException unable to get content from that URI
*/
public JsonSchema fromURI(final URI uri)
throws JsonSchemaException
{
return fromURI(uri, "");
}
/**
* Create a schema instance from a JSON Schema located at a given URI
*
* @see URI#create(String)
* @see #fromURI(URI, String)
*
* @param str the URI as a string
* @return a {@link JsonSchema} instance
* @throws JsonSchemaException unable to get content from that URI
* @throws IllegalArgumentException URI is invalid
*/
public JsonSchema fromURI(final String str)
throws JsonSchemaException
{
return fromURI(URI.create(str), "");
}
/**
* Create a schema instance from a JSON Schema located at a given URI and
* at a given path
*
* @see URI#create(String)
* @see #fromURI(URI, String)
*
* @param str the URI as a string
* @param path the JSON Pointer/id reference into the downloaded schema
* @return a {@link JsonSchema} instance
* @throws JsonSchemaException unable to get content from that URI
* @throws IllegalArgumentException URI is invalid
*/
public JsonSchema fromURI(final String str, final String path)
throws JsonSchemaException
{
return fromURI(URI.create(str), path);
}
/**
* Create a {@link JsonSchema} instance
*
* @param schemaContext the schema container
* @param schema the subschema
* @return a {@link JsonSchema} instance
*/
private JsonSchema createSchema(final SchemaContext schemaContext,
final JsonNode schema)
{
final SchemaNode schemaNode = new SchemaNode(schemaContext, schema);
final JsonValidatorCache cache
= getValidatorCache(schemaContext.getSchema());
return new JsonSchema(cache, schemaNode);
}
private JsonValidatorCache getValidatorCache(final JsonNode schema)
{
final JsonNode node = schema.path("$schema");
if (!node.isTextual())
return validatorCaches.get(defaultSchemaURI);
JsonRef ref;
try {
ref = JsonRef.fromString(node.textValue());
if (!validatorCaches.containsKey(ref))
ref = defaultSchemaURI;
} catch (JsonSchemaException ignored) {
ref = defaultSchemaURI;
}
return validatorCaches.get(ref);
}
/**
* Builder class for a {@link JsonSchemaFactory}
*/
public static final class Builder
{
/**
* Addressing mode
*/
private AddressingMode addressingMode = AddressingMode.CANONICAL;
/**
* Default schema URI
*/
private JsonRef defaultSchemaURI = SchemaURIs.draftV3HyperSchema();
/**
* Keyword registries
*/
private final Map metaSchemas;
/**
* The URI manager
*/
private final URIManager uriManager = new URIManager();
/**
* The namespace
*/
private URI namespace = URI.create("");
/**
* Schema bundle
*/
private final SchemaBundle bundle = new SchemaBundle();
/**
* Constructor
*/
public Builder()
{
// Build keyword registries
metaSchemas = Maps.newHashMap();
JsonRef ref;
MetaSchema metaSchema;
for (final BuiltinSchemas builtin: BuiltinSchemas.values()) {
ref = JsonRef.fromURI(builtin.getURI());
metaSchema = MetaSchema.copyOf(builtin);
metaSchemas.put(ref, metaSchema);
}
}
/**
* Register a {@link URIDownloader} for a given scheme
*
* @param scheme the URI scheme
* @param downloader the downloader
* @return the builder
* @throws NullPointerException scheme is null
* @throws IllegalArgumentException illegal scheme
*/
public Builder registerScheme(final String scheme,
final URIDownloader downloader)
{
uriManager.registerScheme(scheme, downloader);
return this;
}
/**
* Unregister a scheme
*
* @param scheme the scheme to desupport
* @return the builder
*/
public Builder unregisterScheme(final String scheme)
{
uriManager.unregisterScheme(scheme);
return this;
}
/**
* Sets the addressing mode for this factory
*
* @param addressingMode the addressing mode
* @return the builder
*/
public Builder addressingMode(final AddressingMode addressingMode)
{
this.addressingMode = addressingMode;
return this;
}
/**
* Set the schema registry's namespace
*
* @see SchemaRegistry
*
* @param namespace the namespace, as a string
* @return the builder
* @throws IllegalArgumentException invalid URI (see {@link
* URI#create(String)})
*/
public Builder setNamespace(final String namespace)
{
this.namespace = URI.create(namespace);
return this;
}
/**
* Add an URI redirection
*
* This allows you to add an alias for a schema location so that it
* point to another of your choice. It may be useful if you have to
* resolve absolute JSON References normally unreachable, but you have
* a copy of this schema locally.
*
* Note that both URIs must be absolute.
*
* @see JsonRef
*
* @param from the source URI, as a string
* @param to the target URI, as a string
* @return the builder
* @throws IllegalArgumentException either {@code from} or {@code to}
* is an invalid URI, or it is not an absolute JSON Reference
*/
public Builder addRedirection(final String from, final String to)
{
uriManager.addRedirection(from, to);
return this;
}
/**
* Add a keyword registry to the factory
*
* @param schemaURI the URI for the new registry
* @param keywordRegistry the keyword registry
* @param byDefault whether this registry will be the default
* @return the builder
* @throws NullPointerException the URI or registry are null
*
* @deprecated
*/
@Deprecated
public Builder addKeywordRegistry(final JsonRef schemaURI,
final KeywordRegistry keywordRegistry, final boolean byDefault)
{
Preconditions.checkNotNull(schemaURI, "schema URI cannot be null");
Preconditions.checkNotNull(keywordRegistry,
"keyword registry cannot be null");
final MetaSchema metaSchema = MetaSchema.builder()
.withURI(schemaURI.toString())
.addKeywordRegistry(keywordRegistry).build();
metaSchemas.put(schemaURI, metaSchema);
if (byDefault)
defaultSchemaURI = schemaURI;
return this;
}
public Builder addMetaSchema(final MetaSchema metaSchema,
final boolean byDefault)
{
final JsonRef dollarSchema = metaSchema.getDollarSchema();
metaSchemas.put(dollarSchema, metaSchema);
if (byDefault)
defaultSchemaURI = dollarSchema;
return this;
}
/**
* Register a schema
*
* @param uri the URI of this schema
* @param schema the schema
* @return the builder
*
* @see SchemaBundle#addSchema(URI, JsonNode)
*/
public Builder addSchema(final URI uri, final JsonNode schema)
{
bundle.addSchema(uri, schema);
return this;
}
/**
* Register a schema
*
* @param uri the URI of this schema
* @param schema the schema
* @return the builder
*
* @see SchemaBundle#addSchema(String, JsonNode)
*/
public Builder addSchema(final String uri, final JsonNode schema)
{
bundle.addSchema(uri, schema);
return this;
}
/**
* Build the factory
*
* @return the factory
*/
public JsonSchemaFactory build()
{
return new JsonSchemaFactory(this);
}
}
}
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