org.codehaus.jackson.node.ObjectNode Maven / Gradle / Ivy
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Data Mapper package is a high-performance data binding package
built on Jackson JSON processor
package org.codehaus.jackson.node;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.*;
import org.codehaus.jackson.*;
import org.codehaus.jackson.map.SerializerProvider;
/**
* Note that maps to Json Object structures in Json content.
*/
public class ObjectNode
extends ContainerNode
{
LinkedHashMap _children = null;
public ObjectNode(JsonNodeFactory nc) { super(nc); }
/*
///////////////////////////////////////////////////////////
// Implementation of core JsonNode API
///////////////////////////////////////////////////////////
*/
@Override public JsonToken asToken() { return JsonToken.START_OBJECT; }
@Override
public boolean isObject() { return true; }
@Override
public int size() {
return (_children == null) ? 0 : _children.size();
}
@Override
public Iterator getElements()
{
return (_children == null) ? NoNodesIterator.instance() : _children.values().iterator();
}
@Override
public JsonNode get(int index) { return null; }
@Override
public JsonNode get(String fieldName)
{
if (_children != null) {
return _children.get(fieldName);
}
return null;
}
@Override
public Iterator getFieldNames()
{
return (_children == null) ? NoStringsIterator.instance() : _children.keySet().iterator();
}
@Override
public JsonNode path(int index)
{
return MissingNode.getInstance();
}
@Override
public JsonNode path(String fieldName)
{
if (_children != null) {
JsonNode n = _children.get(fieldName);
if (n != null) {
return n;
}
}
return MissingNode.getInstance();
}
/*
////////////////////////////////////////////////////
// Public API, serialization
////////////////////////////////////////////////////
*/
/**
* Method that can be called to serialize this node and
* all of its descendants using specified JSON generator.
*/
@Override
public final void serialize(JsonGenerator jg, SerializerProvider provider)
throws IOException, JsonProcessingException
{
jg.writeStartObject();
if (_children != null) {
for (Map.Entry en : _children.entrySet()) {
jg.writeFieldName(en.getKey());
/* 17-Feb-2009, tatu: Can we trust that all nodes will always
* extend BaseJsonNode? Or if not, at least implement
* JsonSerializable? Let's start with former, change if
* we must.
*/
((BaseJsonNode) en.getValue()).serialize(jg, provider);
}
}
jg.writeEndObject();
}
/*
///////////////////////////////////////////////////////////
// Extended ObjectNode API, accessors
///////////////////////////////////////////////////////////
*/
/**
* Method to use for accessing all fields (with both names
* and values) of this Json Object.
*/
public Iterator> getFields()
{
if (_children == null) {
return NoFieldsIterator.instance;
}
return _children.entrySet().iterator();
}
/*
///////////////////////////////////////////////////////////
// Extended ObjectNode API, mutators, generic
///////////////////////////////////////////////////////////
*/
/**
* Method that will set specified field, replacing old value,
* if any.
*
* @param value to set field to; if null, will be converted
* to a {@link NullNode} first (to remove field entry, call
* {@link #remove} instead)
*
* @return Old value of the field, if any; null if there was no
* old value.
*/
public JsonNode put(String fieldName, JsonNode value)
{
if (value == null) { // let's not store 'raw' nulls but nodes
value = nullNode();
}
return _put(fieldName, value);
}
/**
* Method for removing field entry from this ObjectNode.
* Will return value of the field, if such field existed;
* null if not.
*/
public JsonNode remove(String fieldName)
{
if (_children != null) {
return _children.remove(fieldName);
}
return null;
}
public ObjectNode removeAll()
{
_children = null;
return this;
}
/**
* Method for adding given properties to this object node, overriding
* any existing values for those properties.
*
* @param properties Properties to add
*
* @return This node (to allow chaining)
*
* @since 1.3
*/
public JsonNode putAll(Map properties)
{
if (_children == null) {
_children = new LinkedHashMap(properties);
} else {
for (Map.Entry en : properties.entrySet()) {
JsonNode n = en.getValue();
if (n == null) {
n = nullNode();
}
_children.put(en.getKey(), n);
}
}
return this;
}
/**
* Method for adding all properties of the given Object, overriding
* any existing values for those properties.
*
* @param other Object of which properties to add to this object
*
* @return This node (to allow chaining)
*
* @since 1.3
*/
public JsonNode putAll(ObjectNode other)
{
if (_children == null) {
_children = new LinkedHashMap();
}
Iterator> it = other.getFields();
while (it.hasNext()) {
Map.Entry en = it.next();
_children.put(en.getKey(), en.getValue());
}
return this;
}
/*
///////////////////////////////////////////////////////////
// Extended ObjectNode API, mutators, typed
///////////////////////////////////////////////////////////
*/
/**
* Method that will construct an ArrayNode and add it as a
* field of this ObjectNode, replacing old value, if any.
*
* @return Newly constructed ArrayNode (NOT the old value,
* which could be of any type)
*/
public ArrayNode putArray(String fieldName)
{
ArrayNode n = arrayNode();
_put(fieldName, n);
return n;
}
/**
* Method that will construct an ObjectNode and add it as a
* field of this ObjectNode, replacing old value, if any.
*
* @return Newly constructed ObjectNode (NOT the old value,
* which could be of any type)
*/
public ObjectNode putObject(String fieldName)
{
ObjectNode n = objectNode();
_put(fieldName, n);
return n;
}
public void putPOJO(String fieldName, Object pojo)
{
_put(fieldName, POJONode(pojo));
}
public void putNull(String fieldName)
{
_put(fieldName, nullNode());
}
/**
* Method for setting value of a field to specified numeric value.
*/
public void put(String fieldName, int v) { _put(fieldName, numberNode(v)); }
/**
* Method for setting value of a field to specified numeric value.
*/
public void put(String fieldName, long v) { _put(fieldName, numberNode(v)); }
/**
* Method for setting value of a field to specified numeric value.
*/
public void put(String fieldName, float v) { _put(fieldName, numberNode(v)); }
/**
* Method for setting value of a field to specified numeric value.
*/
public void put(String fieldName, double v) { _put(fieldName, numberNode(v)); }
/**
* Method for setting value of a field to specified numeric value.
*/
public void put(String fieldName, BigDecimal v) {
if (v == null) {
putNull(fieldName);
} else {
_put(fieldName, numberNode(v));
}
}
/**
* Method for setting value of a field to specified String value.
*/
public void put(String fieldName, String v) {
if (v == null) {
putNull(fieldName);
} else {
_put(fieldName, textNode(v));
}
}
/**
* Method for setting value of a field to specified String value.
*/
public void put(String fieldName, boolean v) { _put(fieldName, booleanNode(v)); }
/**
* Method for setting value of a field to specified binary value
*/
public void put(String fieldName, byte[] v) {
if (v == null) {
putNull(fieldName);
} else {
_put(fieldName, binaryNode(v));
}
}
/*
////////////////////////////////////////////////////////
// Standard methods
////////////////////////////////////////////////////////
*/
@Override
public boolean equals(Object o)
{
if (o == this) return true;
if (o == null) return false;
if (o.getClass() != getClass()) {
return false;
}
ObjectNode other = (ObjectNode) o;
if (other.size() != size()) {
return false;
}
if (_children != null) {
for (Map.Entry en : _children.entrySet()) {
String key = en.getKey();
JsonNode value = en.getValue();
JsonNode otherValue = other.get(key);
if (otherValue == null || !otherValue.equals(value)) {
return false;
}
}
}
return true;
}
@Override
public int hashCode()
{
return (_children == null) ? -1 : _children.hashCode();
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder(32 + (size() << 4));
sb.append("{");
if (_children != null) {
int count = 0;
for (Map.Entry en : _children.entrySet()) {
if (count > 0) {
sb.append(",");
}
++count;
TextNode.appendQuoted(sb, en.getKey());
sb.append(':');
sb.append(en.getValue().toString());
}
}
sb.append("}");
return sb.toString();
}
/*
////////////////////////////////////////////////////////
// Internal methods
////////////////////////////////////////////////////////
*/
private final JsonNode _put(String fieldName, JsonNode value)
{
if (_children == null) {
_children = new LinkedHashMap();
}
return _children.put(fieldName, value);
}
/*
////////////////////////////////////////////////////////
// Helper classes
////////////////////////////////////////////////////////
*/
/**
* For efficiency, let's share the "no fields" iterator...
*/
protected static class NoFieldsIterator
implements Iterator>
{
final static NoFieldsIterator instance = new NoFieldsIterator();
private NoFieldsIterator() { }
public boolean hasNext() { return false; }
public Map.Entry next() { throw new NoSuchElementException(); }
public void remove() { // or IllegalOperationException?
throw new IllegalStateException();
}
}
}
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