/
JsonTypeDescriptor.java
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/
JsonTypeDescriptor.java
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package com.vladmihalcea.hibernate.type.json.internal;
import com.vladmihalcea.hibernate.util.LogUtils;
import com.vladmihalcea.hibernate.type.util.ObjectMapperWrapper;
import com.vladmihalcea.hibernate.util.ReflectionUtils;
import org.hibernate.HibernateException;
import org.hibernate.annotations.common.reflection.XProperty;
import org.hibernate.annotations.common.reflection.java.JavaXMember;
import org.hibernate.engine.jdbc.BinaryStream;
import org.hibernate.engine.jdbc.internal.BinaryStreamImpl;
import org.hibernate.type.descriptor.WrapperOptions;
import org.hibernate.type.descriptor.java.AbstractTypeDescriptor;
import org.hibernate.type.descriptor.java.BlobTypeDescriptor;
import org.hibernate.type.descriptor.java.DataHelper;
import org.hibernate.type.descriptor.java.MutableMutabilityPlan;
import org.hibernate.usertype.DynamicParameterizedType;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.sql.Blob;
import java.sql.SQLException;
import java.util.*;
/**
* @author Vlad Mihalcea
*/
public class JsonTypeDescriptor
extends AbstractTypeDescriptor<Object> implements DynamicParameterizedType {
private Type propertyType;
private Class propertyClass;
private ObjectMapperWrapper objectMapperWrapper;
public JsonTypeDescriptor() {
this(ObjectMapperWrapper.INSTANCE);
}
public JsonTypeDescriptor(Type type) {
this();
setPropertyClass(type);
}
public JsonTypeDescriptor(final ObjectMapperWrapper objectMapperWrapper) {
super(Object.class, new MutableMutabilityPlan<Object>() {
@Override
protected Object deepCopyNotNull(Object value) {
return objectMapperWrapper.clone(value);
}
});
this.objectMapperWrapper = objectMapperWrapper;
}
public JsonTypeDescriptor(final ObjectMapperWrapper objectMapperWrapper, Type type) {
this(objectMapperWrapper);
setPropertyClass(type);
}
@Override
public void setParameterValues(Properties parameters) {
final XProperty xProperty = (XProperty) parameters.get(DynamicParameterizedType.XPROPERTY);
Type type = (xProperty instanceof JavaXMember) ?
((JavaXMember) xProperty).getJavaType() :
((ParameterType) parameters.get(PARAMETER_TYPE)).getReturnedClass();
setPropertyClass(type);
}
@Override
public boolean areEqual(Object one, Object another) {
if (one == another) {
return true;
}
if (one == null || another == null) {
return false;
}
if (one instanceof String && another instanceof String) {
return one.equals(another);
}
if (one instanceof Collection && another instanceof Collection) {
return Objects.equals(one, another);
}
if (one.getClass().equals(another.getClass()) &&
ReflectionUtils.getDeclaredMethodOrNull(one.getClass(), "equals", Object.class) != null) {
return one.equals(another);
}
return objectMapperWrapper.toJsonNode(objectMapperWrapper.toString(one)).equals(
objectMapperWrapper.toJsonNode(objectMapperWrapper.toString(another))
);
}
@Override
public String toString(Object value) {
return objectMapperWrapper.toString(value);
}
@Override
public Object fromString(String string) {
if (String.class.isAssignableFrom(propertyClass)) {
return string;
}
return objectMapperWrapper.fromString(string, propertyType);
}
@SuppressWarnings({"unchecked"})
@Override
public <X> X unwrap(Object value, Class<X> type, WrapperOptions options) {
if (value == null) {
return null;
}
if (String.class.isAssignableFrom(type)) {
return value instanceof String ? (X) value : (X) toString(value);
} else if (BinaryStream.class.isAssignableFrom(type) ||
byte[].class.isAssignableFrom(type)) {
String stringValue = (value instanceof String) ? (String) value : toString(value);
return (X) new BinaryStreamImpl(DataHelper.extractBytes(new ByteArrayInputStream(stringValue.getBytes())));
} else if (Blob.class.isAssignableFrom(type)) {
String stringValue = (value instanceof String) ? (String) value : toString(value);
final Blob blob = BlobTypeDescriptor.INSTANCE.fromString(stringValue);
return (X) blob;
} else if (Object.class.isAssignableFrom(type)) {
String stringValue = (value instanceof String) ? (String) value : toString(value);
return (X) objectMapperWrapper.toJsonNode(stringValue);
}
throw unknownUnwrap(type);
}
@Override
public <X> Object wrap(X value, WrapperOptions options) {
if (value == null) {
return null;
}
Blob blob = null;
if (Blob.class.isAssignableFrom(value.getClass())) {
blob = options.getLobCreator().wrap((Blob) value);
} else if (byte[].class.isAssignableFrom(value.getClass())) {
blob = options.getLobCreator().createBlob((byte[]) value);
} else if (InputStream.class.isAssignableFrom(value.getClass())) {
InputStream inputStream = (InputStream) value;
try {
blob = options.getLobCreator().createBlob(inputStream, inputStream.available());
} catch (IOException e) {
throw unknownWrap(value.getClass());
}
}
String stringValue;
try {
stringValue = (blob != null) ? new String(DataHelper.extractBytes(blob.getBinaryStream())) : value.toString();
} catch (SQLException e) {
throw new HibernateException("Unable to extract binary stream from Blob", e);
}
return fromString(stringValue);
}
private void setPropertyClass(Type type) {
this.propertyType = type;
if (type instanceof ParameterizedType) {
type = ((ParameterizedType) type).getRawType();
} else if (type instanceof TypeVariable) {
type = ((TypeVariable) type).getGenericDeclaration().getClass();
}
this.propertyClass = (Class) type;
validatePropertyType();
}
private void validatePropertyType() {
if(Collection.class.isAssignableFrom(propertyClass)) {
if (propertyType instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) propertyType;
for(Class genericType : ReflectionUtils.getGenericTypes(parameterizedType)) {
if(validatedTypes.contains(genericType)) {
continue;
}
validatedTypes.add(genericType);
Method equalsMethod = ReflectionUtils.getMethodOrNull(genericType, "equals", Object.class);
Method hashCodeMethod = ReflectionUtils.getMethodOrNull(genericType, "hashCode");
if(equalsMethod == null ||
hashCodeMethod == null ||
Object.class.equals(equalsMethod.getDeclaringClass()) ||
Object.class.equals(hashCodeMethod.getDeclaringClass())) {
LogUtils.LOGGER.warn("The {} class should override both the equals and hashCode methods based on the JSON object value it represents!", genericType);
}
}
}
}
}
private static List<Class> validatedTypes = new ArrayList<>();
}