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Java JSON Schema Generator – creating a JSON Schema (Draft 7) from your Java classes
/*
* Copyright 2019 VicTools.
*
* 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 com.github.victools.jsonschema.generator;
import com.fasterxml.classmate.ResolvedType;
import com.fasterxml.classmate.ResolvedTypeWithMembers;
import com.fasterxml.classmate.members.ResolvedMethod;
import com.github.victools.jsonschema.generator.impl.LazyValue;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedParameterizedType;
import java.lang.reflect.AnnotatedType;
import java.lang.reflect.Method;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;
/**
* Representation of a single introspected method.
*/
public class MethodScope extends MemberScope {
private final LazyValue getterField = new LazyValue<>(this::doFindGetterField);
/**
* Constructor.
*
* @param method targeted method
* @param declaringTypeMembers collection of the declaring type's fields and (other) methods
* @param context the overall type resolution context
*/
protected MethodScope(ResolvedMethod method, ResolvedTypeWithMembers declaringTypeMembers, TypeContext context) {
this(method, null, null, declaringTypeMembers, false, context);
}
/**
* Constructor.
*
* @param method targeted method
* @param overriddenType alternative type for this method's return value
* @param overriddenName alternative name for this method
* @param declaringTypeMembers collection of the declaring type's fields and (other) methods
* @param fakeContainerItemScope whether this field/method scope represents only the container item type of the actual field/method
* @param context the overall type resolution context
*/
protected MethodScope(ResolvedMethod method, ResolvedType overriddenType, String overriddenName,
ResolvedTypeWithMembers declaringTypeMembers, boolean fakeContainerItemScope, TypeContext context) {
super(method, overriddenType, overriddenName, declaringTypeMembers, fakeContainerItemScope, context);
}
@Override
public MethodScope withOverriddenType(ResolvedType overriddenType) {
return new MethodScope(this.getMember(), overriddenType, this.getOverriddenName(), this.getDeclaringTypeMembers(),
this.isFakeContainerItemScope(), this.getContext());
}
@Override
public MethodScope withOverriddenName(String overriddenName) {
return new MethodScope(this.getMember(), this.getOverriddenType(), overriddenName, this.getDeclaringTypeMembers(),
this.isFakeContainerItemScope(), this.getContext());
}
@Override
public MethodScope asFakeContainerItemScope() {
return (MethodScope) super.asFakeContainerItemScope();
}
/**
* Indicating whether the method is declared as {@code void}, i.e. has no return value.
*
* @return whether method has no return value
*/
public boolean isVoid() {
return this.getType() == null;
}
/**
* Returns the number of arguments this method has.
*
* @return number of arguments
*/
public int getArgumentCount() {
return this.getMember().getArgumentCount();
}
/**
* Returns the list of types of this method's arguments.
*
* @return argument types
*/
public List getArgumentTypes() {
return IntStream.range(0, this.getArgumentCount())
.mapToObj(this.getMember()::getArgumentType)
.collect(Collectors.toList());
}
/**
* Look-up the field associated with this method if it is deemed to be a getter by convention.
*
* @return associated field
*/
public FieldScope findGetterField() {
return this.getterField.get();
}
/**
* Look-up the field associated with this method if it is deemed to be a getter by convention.
*
* @return associated field
*/
private FieldScope doFindGetterField() {
if (this.getType() == null || !this.isPublic() || this.getArgumentCount() > 0) {
// void and non-public methods or those with arguments are not deemed to be getters
return null;
}
String methodName = this.getName();
String fieldName;
if (methodName.startsWith("get") && methodName.length() > 3 && Character.isUpperCase(methodName.charAt(3))) {
// ensure that the variable starts with a lower-case letter
fieldName = methodName.substring(3, 4).toLowerCase() + methodName.substring(4);
} else if (methodName.startsWith("is") && methodName.length() > 2 && Character.isUpperCase(methodName.charAt(2))) {
// ensure that the variable starts with a lower-case letter
fieldName = methodName.substring(2, 3).toLowerCase() + methodName.substring(3);
} else {
// method name does not fall into getter conventions
fieldName = null;
}
if (fieldName == null) {
return null;
}
// method name matched getter conventions
// check whether a matching field exists
return Stream.of(this.getDeclaringTypeMembers().getMemberFields())
.filter(memberField -> memberField.getName().equals(fieldName))
.findFirst()
.map(field -> this.getContext().createFieldScope(field, this.getDeclaringTypeMembers()))
.orElse(null);
}
/**
* Determine whether the method's name matches the getter naming convention ("getFoo()"/"isFoo()") and a respective field ("foo") exists.
*
* @return whether method name starts with "get"/"is" and rest matches name of field in declaring class
* @see #findGetterField()
*/
public boolean isGetter() {
return this.findGetterField() != null;
}
/**
* Return the annotation of the given type on the method or its return type, if such an annotation is present.
*
* @param type of annotation to look-up
* @param annotationClass annotation class to look up instance on member for
* @return annotation instance (or {@code null} if no annotation of the given type is present
*/
@Override
public A getAnnotation(Class annotationClass) {
A annotation = super.getAnnotation(annotationClass);
if (annotation == null) {
annotation = this.getRawMember().getAnnotatedReturnType().getAnnotation(annotationClass);
}
return annotation;
}
@Override
public A getContainerItemAnnotation(Class annotationClass) {
AnnotatedType annotatedReturnType = this.getRawMember().getAnnotatedReturnType();
if (annotatedReturnType instanceof AnnotatedParameterizedType) {
AnnotatedType[] typeArguments = ((AnnotatedParameterizedType) annotatedReturnType).getAnnotatedActualTypeArguments();
if (typeArguments.length > 0) {
return typeArguments[0].getAnnotation(annotationClass);
}
}
return null;
}
@Override
public A getAnnotationConsideringFieldAndGetter(Class annotationClass) {
A annotation = this.getAnnotation(annotationClass);
if (annotation == null) {
MemberScope associatedField = this.findGetterField();
annotation = associatedField == null ? null : associatedField.getAnnotation(annotationClass);
}
return annotation;
}
@Override
public A getContainerItemAnnotationConsideringFieldAndGetter(Class annotationClass) {
A annotation = this.getContainerItemAnnotation(annotationClass);
if (annotation == null) {
MemberScope associatedField = this.findGetterField();
annotation = associatedField == null ? null : associatedField.getContainerItemAnnotation(annotationClass);
}
return annotation;
}
/**
* Returns the name to be used to reference this method in its parent's "properties".
*
* @return the (potentially overridden) name of the method followed by its argument types in parentheses
* @see #getName()
* @see TypeContext#getMethodPropertyArgumentTypeDescription(ResolvedType)
*/
@Override
protected String doGetSchemaPropertyName() {
String result = this.getName();
if (this.getContext().isDerivingFieldsFromArgumentFreeMethods() && this.getArgumentCount() == 0) {
if (this.getOverriddenName() == null) {
// remove the "get"/"is" prefix from non-overridden method names
if (result.startsWith("get") && result.length() > 3) {
result = Character.toLowerCase(result.charAt(3)) + result.substring(4);
} else if (result.startsWith("is") && result.length() > 2) {
result = Character.toLowerCase(result.charAt(2)) + result.substring(3);
}
}
} else {
result += this.getArgumentTypes().stream()
.map(this.getContext()::getMethodPropertyArgumentTypeDescription)
.collect(Collectors.joining(", ", "(", ")"));
}
return result;
}
}