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JcfRuntime.java
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JcfRuntime.java
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package io.burt.jmespath.jcf;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.Collection;
import java.util.Iterator;
import java.util.Collections;
import io.burt.jmespath.BaseRuntime;
import io.burt.jmespath.JmesPathType;
import io.burt.jmespath.RuntimeConfiguration;
import io.burt.jmespath.util.StringEscapeHelper;
import static io.burt.jmespath.JmesPathType.*;
public class JcfRuntime extends BaseRuntime<Object> {
private static final StringEscapeHelper jsonEscapeHelper = new StringEscapeHelper(
true,
'b', '\b',
't', '\t',
'n', '\n',
'f', '\f',
'r', '\r',
'\\', '\\',
'\"', '\"'
);
public JcfRuntime() {
}
public JcfRuntime(RuntimeConfiguration configuration) {
super(configuration);
}
@Override
public Object parseString(String string) {
return JsonParser.fromString(string, this);
}
@Override
@SuppressWarnings("unchecked")
public List<Object> toList(Object value) {
switch (typeOf(value)) {
case ARRAY:
if (value instanceof List) {
return (List<Object>) value;
} else {
return new ArrayList<>((Collection<Object>) value);
}
case OBJECT:
Map<Object, Object> object = (Map<Object, Object>) value;
return new ArrayList<>(object.values());
default:
return Collections.emptyList();
}
}
@Override
public String toString(Object str) {
if (typeOf(str) == STRING) {
return (String) str;
} else {
return unparse(str);
}
}
@Override
public Number toNumber(Object n) {
if (typeOf(n) == NUMBER) {
return (Number) n;
} else {
return null;
}
}
@Override
public JmesPathType typeOf(Object value) {
if (value == null) {
return NULL;
} else if (value instanceof Boolean) {
return BOOLEAN;
} else if (value instanceof Number) {
return NUMBER;
} else if (value instanceof Map) {
return OBJECT;
} else if (value instanceof Collection) {
return ARRAY;
} else if (value instanceof String) {
return STRING;
} else {
throw new IllegalStateException(String.format("Unknown node type encountered: %s", value.getClass().getName()));
}
}
@Override
@SuppressWarnings("unchecked")
public boolean isTruthy(Object value) {
switch (typeOf(value)) {
case NULL:
return false;
case NUMBER:
return true;
case BOOLEAN:
return ((Boolean)value).booleanValue();
case ARRAY:
return !((Collection<Object>) value).isEmpty();
case OBJECT:
return !((Map<Object,Object>) value).isEmpty();
case STRING:
return !((String) value).isEmpty();
default:
throw new IllegalStateException(String.format("Unknown node type encountered: %s", value.getClass().getName()));
}
}
@Override
@SuppressWarnings("unchecked")
public Object getProperty(Object value, Object name) {
if (typeOf(value) == OBJECT) {
return ((Map<Object, Object>) value).get(name);
} else {
return null;
}
}
@Override
@SuppressWarnings("unchecked")
public Collection<Object> getPropertyNames(Object value) {
if (typeOf(value) == OBJECT) {
return ((Map<Object, Object>) value).keySet();
} else {
return Collections.emptyList();
}
}
@Override
public Object createNull() {
return null;
}
@Override
public Object createArray(Collection<Object> elements) {
if (elements instanceof List) {
return elements;
} else {
return new ArrayList<>(elements);
}
}
@Override
public Object createString(String str) {
return str;
}
@Override
public Object createBoolean(boolean b) {
return Boolean.valueOf(b);
}
@Override
public Object createObject(Map<Object, Object> obj) {
return obj;
}
@Override
public Object createNumber(double n) {
return n;
}
@Override
public Object createNumber(long n) {
return n;
}
/**
* Helper method to render a value as JSON.
*
* Assumes that <code>null</code>, <code>number</code> and <code>boolean</code>
* render themseves correctly with <code>toString</code>, and that
* <code>string</code> renders itself as an unquoted string.
*/
private String unparse(Object object) {
switch (typeOf(object)) {
case NUMBER:
case BOOLEAN:
return object.toString();
case NULL:
return "null";
case STRING:
return '"' + jsonEscapeHelper.escape(toString(object)) + '"';
case OBJECT:
return unparseObject(object);
case ARRAY:
return unparseArray(object);
default:
throw new IllegalStateException();
}
}
private String unparseObject(Object object) {
StringBuilder str = new StringBuilder("{");
Collection<Object> propertyNames = getPropertyNames(object);
for (Object key: propertyNames) {
Object value = getProperty(object, key);
str.append('"').append(jsonEscapeHelper.escape(toString(key))).append("\":");
str.append(unparse(value));
str.append(',');
}
if (!propertyNames.isEmpty()) {
str.setLength(str.length() - 1);
}
return str.append('}').toString();
}
private String unparseArray(Object array) {
StringBuilder str = new StringBuilder("[");
List<Object> elements = toList(array);
for (Object element : elements) {
str.append(unparse(element)).append(',');
}
if (!elements.isEmpty()) {
str.setLength(str.length() - 1);
}
return str.append(']').toString();
}
}