/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.solr.client.solrj.beans;
import org.apache.solr.common.SolrDocumentList;
import org.apache.solr.common.SolrDocument;
import org.apache.solr.common.SolrInputDocument;
import java.lang.reflect.*;
import java.util.*;
import java.util.regex.Pattern;
import java.util.concurrent.ConcurrentHashMap;
import java.nio.ByteBuffer;
/**
* A class to map objects to and from solr documents.
*
* @version $Id: DocumentObjectBinder.java 945245 2010-05-17 17:18:10Z rmuir $
* @since solr 1.3
*/
public class DocumentObjectBinder {
private final Map<Class, List<DocField>> infocache = new ConcurrentHashMap<Class, List<DocField>>();
public DocumentObjectBinder() {
}
public <T> List<T> getBeans(Class<T> clazz, SolrDocumentList solrDocList) {
List<DocField> fields = getDocFields( clazz );
List<T> result = new ArrayList<T>(solrDocList.size());
for(int j=0;j<solrDocList.size();j++) {
SolrDocument sdoc = solrDocList.get(j);
result.add(getBean(clazz, fields, sdoc));
}
return result;
}
public <T> T getBean(Class<T> clazz, SolrDocument solrDoc) {
return getBean(clazz, null,solrDoc);
}
private <T> T getBean(Class<T> clazz, List<DocField> fields, SolrDocument solrDoc) {
if (fields == null) {
fields = getDocFields(clazz);
}
T obj = null;
try {
obj = clazz.newInstance();
} catch (Exception e) {
throw new RuntimeException("Could not instantiate object of " + clazz, e);
}
for (int i = 0; i < fields.size(); i++) {
DocField docField = fields.get(i);
docField.inject(obj, solrDoc);
}
return obj;
}
public SolrInputDocument toSolrInputDocument( Object obj )
{
List<DocField> fields = getDocFields( obj.getClass() );
if( fields.isEmpty() ) {
throw new RuntimeException( "class: "+obj.getClass()+" does not define any fields." );
}
SolrInputDocument doc = new SolrInputDocument();
for (DocField field : fields) {
if (field.dynamicFieldNamePatternMatcher != null
&& field.get(obj) != null && field.isContainedInMap) {
Map<String, Object> mapValue = (HashMap<String, Object>) field
.get(obj);
for (Map.Entry<String, Object> e : mapValue.entrySet()) {
doc.setField( e.getKey(), e.getValue(), 1.0f);
}
} else {
doc.setField(field.name, field.get(obj), 1.0f);
}
}
return doc;
}
private List<DocField> getDocFields( Class clazz )
{
List<DocField> fields = infocache.get(clazz);
if (fields == null) {
synchronized(infocache) {
infocache.put(clazz, fields = collectInfo(clazz));
}
}
return fields;
}
private List<DocField> collectInfo(Class clazz) {
List<DocField> fields = new ArrayList<DocField>();
Class superClazz = clazz;
ArrayList<AccessibleObject> members = new ArrayList<AccessibleObject>();
while (superClazz != null && superClazz != Object.class) {
members.addAll(Arrays.asList(superClazz.getDeclaredFields()));
members.addAll(Arrays.asList(superClazz.getDeclaredMethods()));
superClazz = superClazz.getSuperclass();
}
for (AccessibleObject member : members) {
if (member.isAnnotationPresent(Field.class)) {
member.setAccessible(true);
fields.add(new DocField(member));
}
}
return fields;
}
private static class DocField {
private String name;
private java.lang.reflect.Field field;
private Method setter;
private Method getter;
private Class type;
private boolean isArray = false, isList=false;
/*
* dynamic fields may use a Map based data structure to bind a given field.
* if a mapping is done using, "Map<String, List<String>> foo", <code>isContainedInMap</code>
* is set to <code>TRUE</code> as well as <code>isList</code> is set to <code>TRUE</code>
*/
boolean isContainedInMap =false;
private Pattern dynamicFieldNamePatternMatcher;
public DocField(AccessibleObject member) {
if (member instanceof java.lang.reflect.Field) {
field = (java.lang.reflect.Field) member;
} else {
setter = (Method) member;
}
Field annotation = member.getAnnotation(Field.class);
storeName(annotation);
storeType();
// Look for a matching getter
if( setter != null ) {
String gname = setter.getName();
if( gname.startsWith("set") ) {
gname = "get" + gname.substring(3);
try {
getter = setter.getDeclaringClass().getMethod( gname, (Class[])null );
}
catch( Exception ex ) {
// no getter -- don't worry about it...
if( type == Boolean.class ) {
gname = "is" + setter.getName().substring( 3 );
try {
getter = setter.getDeclaringClass().getMethod( gname, (Class[])null );
}
catch( Exception ex2 ) {
// no getter -- don't worry about it...
}
}
}
}
}
}
private void storeName(Field annotation) {
if (annotation.value().equals(Field.DEFAULT)) {
if (field != null) {
name = field.getName();
} else {
String setterName = setter.getName();
if (setterName.startsWith("set") && setterName.length() > 3) {
name = setterName.substring(3, 4).toLowerCase(Locale.ENGLISH) + setterName.substring(4);
} else {
name = setter.getName();
}
}
}
//dynamic fields are annotated as @Field("categories_*")
else if(annotation.value().indexOf('*') >= 0){
//if the field was annotated as a dynamic field, convert the name into a pattern
//the wildcard (*) is supposed to be either a prefix or a suffix, hence the use of replaceFirst
name = annotation.value().replaceFirst("\\*", "\\.*");
dynamicFieldNamePatternMatcher = Pattern.compile("^"+name+"$");
} else {
name = annotation.value();
}
}
private void storeType() {
if (field != null) {
type = field.getType();
} else {
Class[] params = setter.getParameterTypes();
if (params.length != 1)
throw new RuntimeException("Invalid setter method. Must have one and only one parameter");
type = params[0];
}
if(type == Collection.class || type == List.class || type == ArrayList.class) {
type = Object.class;
isList = true;
/*ParameterizedType parameterizedType = null;
if(field !=null){
if( field.getGenericType() instanceof ParameterizedType){
parameterizedType = (ParameterizedType) field.getGenericType();
Type[] types = parameterizedType.getActualTypeArguments();
if (types != null && types.length > 0) type = (Class) types[0];
}
}*/
} else if(type == byte[].class){
//no op
}else if (type.isArray()) {
isArray = true;
type = type.getComponentType();
}
//corresponding to the support for dynamicFields
else if (type == Map.class || type == HashMap.class) {
isContainedInMap = true;
//assigned a default type
type = Object.class;
if(field != null){
if(field.getGenericType() instanceof ParameterizedType){
//check what are the generic values
ParameterizedType parameterizedType = (ParameterizedType) field.getGenericType();
Type[] types = parameterizedType.getActualTypeArguments();
if(types != null && types.length == 2 && types[0] == String.class){
//the key should always be String
//Raw and primitive types
if(types[1] instanceof Class){
//the value could be multivalued then it is a List ,Collection,ArrayList
if(types[1]== Collection.class || types[1] == List.class || types[1] == ArrayList.class){
type = Object.class;
isList = true;
}else{
//else assume it is a primitive and put in the source type itself
type = (Class) types[1];
}
}
//Of all the Parameterized types, only List is supported
else if(types[1] instanceof ParameterizedType){
Type rawType = ((ParameterizedType)types[1]).getRawType();
if(rawType== Collection.class || rawType == List.class || rawType == ArrayList.class){
type = Object.class;
isList = true;
}
}
//Array types
else if(types[1] instanceof GenericArrayType){
type = (Class) ((GenericArrayType) types[1]).getGenericComponentType();
isArray = true;
}
//Throw an Exception if types are not known
else{
throw new RuntimeException("Allowed type for values of mapping a dynamicField are : " +
"Object, Object[] and List");
}
}
}
}
}
}
/**
* Called by the {@link #inject} method to read the value(s) for a field
* This method supports reading of all "matching" fieldName's in the <code>SolrDocument</code>
*
* Returns <code>SolrDocument.getFieldValue</code> for regular fields,
* and <code>Map<String, List<Object>></code> for a dynamic field. The key is all matching fieldName's.
*/
@SuppressWarnings("unchecked")
private Object getFieldValue(SolrDocument sdoc){
Object fieldValue = sdoc.getFieldValue(name);
if(fieldValue != null) {
//this is not a dynamic field. so return te value
return fieldValue;
}
//reading dynamic field values
if(dynamicFieldNamePatternMatcher != null){
Map<String, Object> allValuesMap = null;
ArrayList allValuesList = null;
if(isContainedInMap){
allValuesMap = new HashMap<String, Object>();
} else {
allValuesList = new ArrayList();
}
for(String field : sdoc.getFieldNames()){
if(dynamicFieldNamePatternMatcher.matcher(field).find()){
Object val = sdoc.getFieldValue(field);
if(val == null) continue;
if(isContainedInMap){
if(isList){
if (!(val instanceof List)) {
ArrayList al = new ArrayList();
al.add(val);
val = al;
}
} else if(isArray){
if (!(val instanceof List)) {
Object[] arr= (Object[]) Array.newInstance(type,1);
arr[0] = val;
val= arr;
} else {
val = Array.newInstance(type,((List)val).size());
}
}
allValuesMap.put(field, val);
}else {
if (val instanceof Collection) {
allValuesList.addAll((Collection) val);
} else {
allValuesList.add(val);
}
}
}
}
if (isContainedInMap) {
return allValuesMap.isEmpty() ? null : allValuesMap;
} else {
return allValuesList.isEmpty() ? null : allValuesList;
}
}
return null;
}
<T> void inject(T obj, SolrDocument sdoc) {
Object val = getFieldValue(sdoc);
if(val == null) {
return;
}
if(isArray && !isContainedInMap){
List list = null;
if(val.getClass().isArray()){
set(obj,val);
return;
} else if (val instanceof List) {
list = (List) val;
} else{
list = new ArrayList();
list.add(val);
}
set(obj, list.toArray((Object[]) Array.newInstance(type,list.size())));
} else if(isList && !isContainedInMap){
if (!(val instanceof List)) {
ArrayList list = new ArrayList();
list.add(val);
val = list;
}
set(obj, val);
} else if(isContainedInMap){
if (val instanceof Map) {
set(obj, val);
}
} else {
set(obj, val);
}
}
private void set(Object obj, Object v) {
if(v!= null && type == ByteBuffer.class && v.getClass()== byte[].class) {
v = ByteBuffer.wrap((byte[])v);
}
try {
if (field != null) {
field.set(obj, v);
} else if (setter != null) {
setter.invoke(obj, v);
}
}
catch (Exception e) {
throw new RuntimeException("Exception while setting value : "+v+" on " + (field != null ? field : setter), e);
}
}
public Object get( final Object obj )
{
if (field != null) {
try {
return field.get(obj);
}
catch (Exception e) {
throw new RuntimeException("Exception while getting value: " + field, e);
}
}
else if (getter == null) {
throw new RuntimeException( "Missing getter for field: "+name+" -- You can only call the 'get' for fields that have a field of 'get' method" );
}
try {
return getter.invoke( obj, (Object[])null );
}
catch (Exception e) {
throw new RuntimeException("Exception while getting value: " + getter, e);
}
}
}
}