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Java implementation of the raml parser
/*
* Copyright 2016 (c) MuleSoft, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific
* language governing permissions and limitations under the License.
*/
package org.raml.parser.rule;
import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.raml.parser.annotation.Mapping;
import org.raml.parser.annotation.Scalar;
import org.raml.parser.annotation.Sequence;
import org.raml.parser.builder.AbstractFactory;
import org.raml.parser.resolver.DefaultTupleHandler;
import org.raml.parser.resolver.EnumHandler;
import org.raml.parser.resolver.TupleHandler;
import org.raml.parser.utils.ReflectionUtils;
import org.yaml.snakeyaml.nodes.MappingNode;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.ScalarNode;
import org.yaml.snakeyaml.nodes.SequenceNode;
public class NodeRuleFactory extends AbstractFactory
{
private NodeRuleFactoryExtension[] extensions;
private Map, Map>> pojoRulesCache = new HashMap, Map>>();
public NodeRuleFactory(NodeRuleFactoryExtension... extensions)
{
this.extensions = extensions;
}
public DefaultTupleRule createDocumentRule(Class documentClass)
{
DefaultTupleRule documentRule = new DefaultTupleRule(null, new DefaultTupleHandler());
documentRule.setNodeRuleFactory(this);
documentRule.addRulesFor(documentClass);
return documentRule;
}
public void addRulesTo(Class pojoClass, TupleRule parent)
{
Map> innerBuilders = pojoRulesCache.get(pojoClass);
if (innerBuilders != null)
{
innerBuilders = copyRules(innerBuilders);
}
else
{
innerBuilders = processPojoAnnotations(pojoClass);
pojoRulesCache.put(pojoClass, new HashMap>(innerBuilders));
}
for (TupleRule tupleRule : innerBuilders.values())
{
tupleRule.setParentTupleRule(parent);
}
parent.setNestedRules(innerBuilders);
}
private Map> copyRules(Map> sourceRules)
{
final Map> copy = new HashMap>();
for (Map.Entry> entry : sourceRules.entrySet())
{
copy.put(entry.getKey(), entry.getValue().deepCopy());
}
return copy;
}
private Map> processPojoAnnotations(Class pojoClass)
{
final List declaredFields = ReflectionUtils.getInheritedFields(pojoClass);
final Map> innerBuilders = new HashMap>();
for (Field declaredField : declaredFields)
{
Scalar scalar = declaredField.getAnnotation(Scalar.class);
Mapping mapping = declaredField.getAnnotation(Mapping.class);
Sequence sequence = declaredField.getAnnotation(Sequence.class);
TupleRule tupleRule = null;
TupleHandler tupleHandler = null;
boolean required = false;
if (scalar != null)
{
tupleRule = createScalarRule(declaredField, scalar);
tupleHandler = createHandler(scalar.handler(), scalar.alias(), ScalarNode.class);
required = scalar.required();
}
else if (mapping != null)
{
tupleRule = createMappingRule(declaredField, mapping);
tupleHandler = createHandler(mapping.handler(), mapping.alias(), MappingNode.class);
required = mapping.required();
if (tupleRule instanceof MapTupleRule)
{
((MapTupleRule) tupleRule).setInnerTupleHandler(createHandler(mapping.innerHandler(), "", null));
}
}
else if (sequence != null)
{
tupleRule = createSequenceRule(declaredField, sequence);
tupleHandler = createHandler(sequence.handler(), sequence.alias(), SequenceNode.class);
required = sequence.required();
}
if (tupleRule != null)
{
if (tupleHandler != null)
{
tupleRule.setHandler(tupleHandler);
}
tupleRule.setRequired(required);
tupleRule.setNodeRuleFactory(this);
innerBuilders.put(declaredField.getName(), tupleRule);
}
}
return innerBuilders;
}
private TupleRule createSequenceRule(Field declaredField, Sequence sequence)
{
TupleRule tupleRule = null;
if (List.class.isAssignableFrom(declaredField.getType()))
{
Type type = declaredField.getGenericType();
if (type instanceof ParameterizedType)
{
ParameterizedType pType = (ParameterizedType) type;
Type itemType = pType.getActualTypeArguments()[0];
if (sequence.rule() != TupleRule.class)
{
tupleRule = createInstanceOfTupleRule(sequence.rule(), declaredField.getName(), itemType);
}
else
{
tupleRule = new SequenceTupleRule(declaredField.getName(), itemType);
}
}
}
else
{
throw new RuntimeException("Only List can be sequence. Error on field " + declaredField.getName());
}
return tupleRule;
}
private TupleRule createMappingRule(Field declaredField, Mapping mapping)
{
TupleRule tupleRule = null;
if (mapping.rule() != TupleRule.class)
{
tupleRule = createInstanceOf(mapping.rule());
}
else
{
if (Map.class.isAssignableFrom(declaredField.getType()))
{
Type type = declaredField.getGenericType();
if (type instanceof ParameterizedType)
{
ParameterizedType pType = (ParameterizedType) type;
Type keyType = pType.getActualTypeArguments()[0];
Type valueType = pType.getActualTypeArguments()[1];
if (keyType instanceof Class)
{
Class keyClass = (Class) keyType;
if (valueType instanceof Class)
{
if (mapping.implicit())
{
tupleRule = new ImplicitMapEntryRule(declaredField.getName(), (Class) valueType);
}
else
{
tupleRule = new MapTupleRule(declaredField.getName(), (Class) valueType);
}
if (keyClass.isEnum())
{
tupleRule.setHandler(new EnumHandler(MappingNode.class, (Class) keyClass));
}
}
else if (valueType instanceof ParameterizedType)
{
Type rawType = ((ParameterizedType) valueType).getRawType();
if (rawType instanceof Class && List.class.isAssignableFrom((Class) rawType))
{
Type listType = ((ParameterizedType) valueType).getActualTypeArguments()[0];
if (listType instanceof Class)
{
tupleRule = new MapWithListValueTupleRule(declaredField.getName(), (Class) listType, this);
}
}
}
}
}
}
else
{
tupleRule = new PojoTupleRule(declaredField.getName(), declaredField.getType());
}
}
List contributionRules = new ArrayList();
for (NodeRuleFactoryExtension extension : extensions)
{
if (extension.handles(declaredField, mapping))
{
TupleRule rule = extension.createRule(declaredField, mapping);
contributionRules.add(rule);
}
}
if (!contributionRules.isEmpty())
{
tupleRule = new ContributionTupleRule(tupleRule, contributionRules);
}
return tupleRule;
}
private TupleRule createScalarRule(Field declaredField, Scalar scalar)
{
TupleRule tupleRule;
if (scalar.rule() != TupleRule.class)
{
tupleRule = createInstanceOfTupleRule(scalar.rule(), declaredField.getName(), declaredField.getType());
}
else
{
if (ReflectionUtils.isPojo(declaredField.getType()))
{
tupleRule = new PojoTupleRule(declaredField.getName(), declaredField.getType());
}
else
{
tupleRule = new SimpleRule(declaredField.getName(), declaredField.getType());
}
}
return tupleRule;
}
private TupleRule createInstanceOfTupleRule(Class rule, String fieldName, Type valueType)
{
TupleRule tupleRule = createInstanceOf(rule);
tupleRule.setName(fieldName);
tupleRule.setValueType(valueType);
tupleRule.setNodeRuleFactory(this);
return tupleRule;
}
}
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