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gwt-jackson is a GWT JSON serializer/deserializer mechanism based on Jackson annotations
/*
* Copyright 2013 Nicolas Morel
*
* 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.nmorel.gwtjackson.rebind;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.EnumMap;
import java.util.EnumSet;
import java.util.List;
import com.fasterxml.jackson.annotation.JsonIgnoreType;
import com.github.nmorel.gwtjackson.client.stream.impl.DefaultJsonWriter;
import com.github.nmorel.gwtjackson.rebind.type.JMapperType;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.typeinfo.HasAnnotations;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.JPrimitiveType;
import com.google.gwt.core.ext.typeinfo.JType;
import com.google.gwt.thirdparty.guava.common.base.Optional;
import com.google.gwt.thirdparty.guava.common.collect.ImmutableList;
/**
* CreatorUtils class.
*
* @author Nicolas Morel
* @version $Id: $
*/
public final class CreatorUtils {
/**
* Browse all the hierarchy of the type and return the first corresponding annotation it found
*
* @param type type
* @param annotation annotation to find
* @return the annotation if found, null otherwise
* @param configuration a {@link com.github.nmorel.gwtjackson.rebind.RebindConfiguration} object.
* @param a T object.
*/
public static Optional findFirstEncounteredAnnotationsOnAllHierarchy( RebindConfiguration configuration,
JClassType type, Class annotation ) {
return findFirstEncounteredAnnotationsOnAllHierarchy( configuration, type, annotation, Optional.absent() );
}
/**
* Browse all the hierarchy of the type and return the first corresponding annotation it found
*
* @param type type
* @param annotation annotation to find
* @param type of the annotation
* @param ignoreType type to ignore when browsing the hierarchy
*
* @return the annotation if found, null otherwise
*/
private static Optional findFirstEncounteredAnnotationsOnAllHierarchy( RebindConfiguration configuration,
JClassType type, Class annotation,
Optional ignoreType ) {
JClassType currentType = type;
while ( null != currentType ) {
Optional mixin = configuration.getMixInAnnotations( currentType );
if ( mixin.isPresent() && mixin.get().isAnnotationPresent( annotation ) ) {
return Optional.of( mixin.get().getAnnotation( annotation ) );
}
if ( currentType.isAnnotationPresent( annotation ) ) {
return Optional.of( currentType.getAnnotation( annotation ) );
}
for ( JClassType interf : currentType.getImplementedInterfaces() ) {
if (!ignoreType.isPresent() || !ignoreType.get().equals( interf )) {
Optional annot = findFirstEncounteredAnnotationsOnAllHierarchy( configuration, interf, annotation );
if ( annot.isPresent() ) {
return annot;
}
}
}
currentType = currentType.getSuperclass();
if ( ignoreType.isPresent() && ignoreType.get().equals( currentType ) ) {
currentType = null;
}
}
return Optional.absent();
}
/**
* Returns true when one of the type has the specified annotation
*
* @param annotation the annotation
* @param hasAnnotationsList the types
* @return true if one the type has the annotation
* @param a T object.
*/
public static boolean isAnnotationPresent( Class annotation, List
hasAnnotationsList ) {
for ( HasAnnotations accessor : hasAnnotationsList ) {
if ( accessor.isAnnotationPresent( annotation ) ) {
return true;
}
}
return false;
}
/**
* Returns the first occurence of the annotation found on the types
*
* @param annotation the annotation
* @param hasAnnotationsList the types
* @return the first occurence of the annotation found on the types
* @param a T object.
*/
public static Optional getAnnotation( String annotation, List
hasAnnotationsList ) {
try {
Class clazz = Class.forName( annotation );
return getAnnotation( clazz, hasAnnotationsList );
} catch ( ClassNotFoundException e ) {
return Optional.absent();
}
}
/**
* Returns the first occurence of the annotation found on the types
*
* @param annotation the annotation
* @param hasAnnotationsList the types
* @return the first occurence of the annotation found on the types
* @param a T object.
*/
public static Optional getAnnotation( Class annotation, List
hasAnnotationsList ) {
for ( HasAnnotations accessor : hasAnnotationsList ) {
if ( accessor.isAnnotationPresent( annotation ) ) {
return Optional.of( accessor.getAnnotation( annotation ) );
}
}
return Optional.absent();
}
/**
* Returns the default value of the given type.
*
* - {@link Object} : null
* - char : '\u0000'
* - boolean : false
* - other primitive : 0
*
*
* @param type type to find the default value
* @return the default value of the type.
*/
public static String getDefaultValueForType( JType type ) {
JPrimitiveType primitiveType = type.isPrimitive();
if ( null != primitiveType ) {
return primitiveType.getUninitializedFieldExpression();
}
return "null";
}
/**
* isObject
*
* @param type the type to test
* @return true if the type is {@link Object}, false otherwise
*/
public static boolean isObject( JType type ) {
return null != type.isClass() && Object.class.getName().equals( type.getQualifiedSourceName() );
}
/**
* isSerializable
*
* @param type the type to test
* @return true if the type is {@link Serializable}, false otherwise
*/
public static boolean isSerializable( JType type ) {
return null != type.isInterface() && Serializable.class.getName().equals( type.getQualifiedSourceName() );
}
/**
* isObjectOrSerializable
*
* @param type the type to test
* @return true if the type is {@link Object} or {@link Serializable}, false otherwise
*/
public static boolean isObjectOrSerializable( JType type ) {
return isObject( type ) || isSerializable( type );
}
/**
* filterSubtypesForSerialization
*
* @param logger a {@link com.google.gwt.core.ext.TreeLogger} object.
* @param configuration a {@link com.github.nmorel.gwtjackson.rebind.RebindConfiguration} object.
* @param type a {@link com.google.gwt.core.ext.typeinfo.JClassType} object.
* @return a {@link com.google.gwt.thirdparty.guava.common.collect.ImmutableList} object.
*/
public static ImmutableList filterSubtypesForSerialization( TreeLogger logger, RebindConfiguration configuration,
JClassType type ) {
boolean filterOnlySupportedType = isObjectOrSerializable( type );
ImmutableList.Builder builder = ImmutableList.builder();
if ( type.getSubtypes().length > 0 ) {
for ( JClassType subtype : type.getSubtypes() ) {
if ( null == subtype.isAnnotation()
&& subtype.isPublic()
&& (!filterOnlySupportedType || configuration.isTypeSupportedForSerialization( logger, subtype ))
&& !findFirstEncounteredAnnotationsOnAllHierarchy( configuration, subtype.isClassOrInterface(), JsonIgnoreType.class, Optional.of( type ) ).isPresent()) {
builder.add( subtype );
}
}
}
return builder.build();
}
/**
* filterSubtypesForDeserialization
*
* @param logger a {@link com.google.gwt.core.ext.TreeLogger} object.
* @param configuration a {@link com.github.nmorel.gwtjackson.rebind.RebindConfiguration} object.
* @param type a {@link com.google.gwt.core.ext.typeinfo.JClassType} object.
* @return a {@link com.google.gwt.thirdparty.guava.common.collect.ImmutableList} object.
*/
public static ImmutableList filterSubtypesForDeserialization( TreeLogger logger, RebindConfiguration configuration,
JClassType type ) {
boolean filterOnlySupportedType = isObjectOrSerializable( type );
ImmutableList.Builder builder = ImmutableList.builder();
if ( type.getSubtypes().length > 0 ) {
for ( JClassType subtype : type.getSubtypes() ) {
if ( (null == subtype.isInterface() && !subtype.isAbstract() && (!subtype.isMemberType() || subtype.isStatic()))
&& null == subtype.isAnnotation()
&& subtype.isPublic()
&& (!filterOnlySupportedType ||
(configuration.isTypeSupportedForDeserialization( logger, subtype )
// EnumSet and EnumMap are not supported in subtype deserialization because we can't know the enum to use.
&& !EnumSet.class.getCanonicalName().equals( subtype.getQualifiedSourceName() )
&& !EnumMap.class.getCanonicalName().equals( subtype.getQualifiedSourceName() )))
&& !findFirstEncounteredAnnotationsOnAllHierarchy( configuration, subtype.isClassOrInterface(), JsonIgnoreType.class, Optional.of( type ) ).isPresent() ) {
builder.add( subtype );
}
}
}
return builder.build();
}
/**
* Escapes the {@link String} given in parameter
*
* @param value the {@link String}
* @return the escaped {@link String}
*/
public static String escapeString( String value ) {
return DefaultJsonWriter.encodeString( value );
}
/**
* findFirstTypeToApplyPropertyAnnotation
*
* @param mapperType the type to search inside
* @return the first bean type encountered
*/
public static JClassType findFirstTypeToApplyPropertyAnnotation( JMapperType mapperType ) {
return findFirstTypeToApplyPropertyAnnotation( Arrays.asList( mapperType ) );
}
/**
* @param mapperTypeList the types to search inside
*
* @return the first bean type encountered
*/
private static JClassType findFirstTypeToApplyPropertyAnnotation( List mapperTypeList ) {
if ( mapperTypeList.isEmpty() ) {
return null;
}
List subLevel = new ArrayList();
for ( JMapperType mapperType : mapperTypeList ) {
if ( mapperType.isBeanMapper() ) {
return mapperType.getType().isClass();
} else if ( mapperType.getParameters().size() > 0 ) {
subLevel.addAll( mapperType.getParameters() );
}
}
return findFirstTypeToApplyPropertyAnnotation( subLevel );
}
private CreatorUtils() {
}
}
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