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Java port of Stefan Goessner JsonPath.
/*
* Copyright 2011 the original author or authors.
* 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.jayway.jsonpath;
import com.jayway.jsonpath.internal.Path;
import com.jayway.jsonpath.internal.PathCompiler;
import com.jayway.jsonpath.internal.token.PredicateContextImpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.math.BigDecimal;
import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Pattern;
import static com.jayway.jsonpath.internal.Utils.join;
import static com.jayway.jsonpath.internal.Utils.notNull;
/**
*
*/
@SuppressWarnings("unchecked")
public class Criteria implements Predicate {
private static final Logger logger = LoggerFactory.getLogger(Criteria.class);
private static final String[] OPERATORS = {
CriteriaType.EQ.toString(),
CriteriaType.GTE.toString(),
CriteriaType.LTE.toString(),
CriteriaType.NE.toString(),
CriteriaType.LT.toString(),
CriteriaType.GT.toString(),
CriteriaType.REGEX.toString()
};
private Object left;
private CriteriaType criteriaType;
private Object right;
private final List criteriaChain;
private static enum CriteriaType {
EQ {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
boolean res = (0 == safeCompare(left, right));
if(logger.isDebugEnabled()) logger.debug("[{}] {} [{}] => {}", right, name(), left, res);
return res;
}
@Override
public String toString() {
return "==";
}
},
NE {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
boolean res = (0 != safeCompare(left, right));
if(logger.isDebugEnabled()) logger.debug("[{}] {} [{}] => {}", right, name(), left, res);
return res;
}
@Override
public String toString() {
return "!=";
}
},
GT {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
if ((left == null) ^ (right == null)) {
return false;
}
boolean res = (0 > safeCompare(left, right));
if(logger.isDebugEnabled()) logger.debug("[{}] {} [{}] => {}", right, name(), left, res);
return res;
}
@Override
public String toString() {
return ">";
}
},
GTE {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
if ((left == null) ^ (right == null)) {
return false;
}
boolean res = (0 >= safeCompare(left, right));
if(logger.isDebugEnabled()) logger.debug("[{}] {} [{}] => {}", right, name(), left, res);
return res;
}
@Override
public String toString() {
return ">=";
}
},
LT {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
if ((left == null) ^ (right == null)) {
return false;
}
boolean res = (0 < safeCompare(left, right));
if(logger.isDebugEnabled()) logger.debug("[{}] {} [{}] => {}", right, name(), left, res);
return res;
}
@Override
public String toString() {
return "<";
}
},
LTE {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
if ((left == null) ^ (right == null)) {
return false;
}
boolean res = (0 <= safeCompare(left, right));
if(logger.isDebugEnabled()) logger.debug("[{}] {} [{}] => {}", right, name(), left, res);
return res;
}
@Override
public String toString() {
return "<=";
}
},
IN {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
boolean res = false;
Collection exps = (Collection) left;
for (Object exp : exps) {
if (0 == safeCompare(exp, right)) {
res = true;
break;
}
}
if(logger.isDebugEnabled()) logger.debug("[{}] {} [{}] => {}", right, name(), join(", ", exps), res);
return res;
}
},
NIN {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
Collection nexps = (Collection) left;
boolean res = !nexps.contains(right);
if(logger.isDebugEnabled()) logger.debug("[{}] {} [{}] => {}", right, name(), join(", ", nexps), res);
return res;
}
},
ALL {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
boolean res = true;
Collection exps = (Collection) left;
if (ctx.configuration().jsonProvider().isArray(right)) {
for (Object exp : exps) {
boolean found = false;
for (Object check : ctx.configuration().jsonProvider().toIterable(right)) {
if (0 == safeCompare(exp, check)) {
found = true;
break;
}
}
if (!found) {
res = false;
break;
}
}
if(logger.isDebugEnabled()) logger.debug("[{}] {} [{}] => {}", join(", ", ctx.configuration().jsonProvider().toIterable(right)), name(), join(", ", exps), res);
} else {
res = false;
if(logger.isDebugEnabled()) logger.debug("[{}] {} [{}] => {}", "", name(), join(", ", exps), res);
}
return res;
}
},
SIZE {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
int size = (Integer) left;
boolean res;
if (ctx.configuration().jsonProvider().isArray(right)) {
int length = ctx.configuration().jsonProvider().length(right);
res = (length == size);
if(logger.isDebugEnabled()) logger.debug("Array with size {} {} {} => {}", length, name(), size, res);
} else if (right instanceof String) {
int length = ((String) right).length();
res = length == size;
if(logger.isDebugEnabled()) logger.debug("String with length {} {} {} => {}", length, name(), size, res);
} else {
res = false;
if(logger.isDebugEnabled()) logger.debug("{} {} {} => {}", right == null ? "null" : right.getClass().getName(), name(), size, res);
}
return res;
}
},
EXISTS {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
//This must be handled outside
throw new UnsupportedOperationException();
}
},
TYPE {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
final Class expType = (Class) left;
final Class actType = right == null ? null : right.getClass();
return actType != null && expType.isAssignableFrom(actType);
}
},
REGEX {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
boolean res = false;
Pattern pattern;
Object target;
if(right instanceof Pattern){
pattern = (Pattern) right;
target = left;
} else {
pattern = (Pattern) left;
target = right;
}
if(target != null){
res = pattern.matcher(target.toString()).matches();
}
if(logger.isDebugEnabled()) logger.debug("[{}] {} [{}] => {}", right == null?"null":right.toString(), name(), left==null?"null":left.toString(), res);
return res;
}
@Override
public String toString() {
return "=~";
}
},
MATCHES {
@Override
boolean eval(Object left, final Object right, final PredicateContext ctx) {
PredicateContextImpl pci = (PredicateContextImpl) ctx;
Predicate exp = (Predicate) left;
return exp.apply(new PredicateContextImpl(right, ctx.root(), ctx.configuration(), pci.documentPathCache()));
}
},
NOT_EMPTY {
@Override
boolean eval(Object left, Object right, PredicateContext ctx) {
boolean res = false;
if (right != null) {
if (ctx.configuration().jsonProvider().isArray(right)) {
int len = ctx.configuration().jsonProvider().length(right);
res = (0 != len);
if(logger.isDebugEnabled()) logger.debug("array length = {} {} => {}", len, name(), res);
} else if (right instanceof String) {
int len = ((String) right).length();
res = (0 != len);
if(logger.isDebugEnabled()) logger.debug("string length = {} {} => {}", len, name(), res);
}
}
return res;
}
};
abstract boolean eval(Object left, Object right, PredicateContext ctx);
public static CriteriaType parse(String str) {
if ("==".equals(str)) {
return EQ;
} else if (">".equals(str)) {
return GT;
} else if (">=".equals(str)) {
return GTE;
} else if ("<".equals(str)) {
return LT;
} else if ("<=".equals(str)) {
return LTE;
} else if ("!=".equals(str)) {
return NE;
} else if ("=~".equals(str)) {
return REGEX;
} else {
throw new UnsupportedOperationException("CriteriaType " + str + " can not be parsed");
}
}
}
private Criteria(List criteriaChain, Object left) {
if(left instanceof Path) {
if (!((Path)left).isDefinite()) {
throw new InvalidCriteriaException("A criteria path must be definite. The path " + left.toString() + " is not!");
}
}
this.left = left;
this.criteriaChain = criteriaChain;
this.criteriaChain.add(this);
}
private Criteria(Object left) {
this(new LinkedList(), left);
}
private Criteria(Object left, CriteriaType criteriaType, Object right) {
this(new LinkedList(), left);
this.criteriaType = criteriaType;
this.right = right;
}
@Override
public boolean apply(PredicateContext ctx) {
for (Criteria criteria : criteriaChain) {
if (!criteria.eval(ctx)) {
return false;
}
}
return true;
}
private Object evaluateIfPath(Object target, PredicateContext ctx){
Object res = target;
if(res instanceof Path){
Path leftPath = (Path) target;
if(ctx instanceof PredicateContextImpl){
//This will use cache for document ($) queries
PredicateContextImpl ctxi = (PredicateContextImpl) ctx;
res = ctxi.evaluate(leftPath);
} else {
Object doc = leftPath.isRootPath()?ctx.root():ctx.item();
res = leftPath.evaluate(doc, ctx.root(), ctx.configuration()).getValue();
}
}
return res;
}
private boolean eval(PredicateContext ctx) {
if (CriteriaType.EXISTS == criteriaType) {
boolean exists = ((Boolean) right);
try {
Configuration c = Configuration.builder().jsonProvider(ctx.configuration().jsonProvider()).options(Option.REQUIRE_PROPERTIES).build();
Object value = ((Path) left).evaluate(ctx.item(), ctx.root(), c).getValue();
if(exists){
return (value != null);
} else {
return (value == null);
}
} catch (PathNotFoundException e) {
return !exists;
}
} else {
try {
Object leftVal = evaluateIfPath(left, ctx);
Object rightVal = evaluateIfPath(right, ctx);
return criteriaType.eval(rightVal, leftVal, ctx);
} catch (ValueCompareException e) {
return false;
} catch (PathNotFoundException e) {
return false;
}
}
}
/**
* Static factory method to create a Criteria using the provided key
*
* @param key filed name
* @return the new criteria
*/
public static Criteria where(Path key) {
return new Criteria(key);
}
/**
* Static factory method to create a Criteria using the provided key
*
* @param key filed name
* @return the new criteria
*/
public static Criteria where(String key) {
if(!key.startsWith("$") && !key.startsWith("@")){
key = "@." + key;
}
return where(PathCompiler.compile(key));
}
/**
* Static factory method to create a Criteria using the provided key
*
* @param key ads new filed to criteria
* @return the criteria builder
*/
public Criteria and(String key) {
if(!key.startsWith("$") && !key.startsWith("@")){
key = "@." + key;
}
return new Criteria(this.criteriaChain, PathCompiler.compile(key));
}
/**
* Creates a criterion using equality
*
* @param o
* @return the criteria
*/
public Criteria is(Object o) {
this.criteriaType = CriteriaType.EQ;
this.right = o;
return this;
}
/**
* Creates a criterion using equality
*
* @param o
* @return the criteria
*/
public Criteria eq(Object o) {
return is(o);
}
/**
* Creates a criterion using the != operator
*
* @param o
* @return the criteria
*/
public Criteria ne(Object o) {
this.criteriaType = CriteriaType.NE;
this.right = o;
return this;
}
/**
* Creates a criterion using the < operator
*
* @param o
* @return the criteria
*/
public Criteria lt(Object o) {
this.criteriaType = CriteriaType.LT;
this.right = o;
return this;
}
/**
* Creates a criterion using the <= operator
*
* @param o
* @return the criteria
*/
public Criteria lte(Object o) {
this.criteriaType = CriteriaType.LTE;
this.right = o;
return this;
}
/**
* Creates a criterion using the > operator
*
* @param o
* @return the criteria
*/
public Criteria gt(Object o) {
this.criteriaType = CriteriaType.GT;
this.right = o;
return this;
}
/**
* Creates a criterion using the >= operator
*
* @param o
* @return the criteria
*/
public Criteria gte(Object o) {
this.criteriaType = CriteriaType.GTE;
this.right = o;
return this;
}
/**
* Creates a criterion using a Regex
*
* @param pattern
* @return the criteria
*/
public Criteria regex(Pattern pattern) {
notNull(pattern, "pattern can not be null");
this.criteriaType = CriteriaType.REGEX;
this.right = pattern;
return this;
}
/**
* The in operator is analogous to the SQL IN modifier, allowing you
* to specify an array of possible matches.
*
* @param o the values to match against
* @return the criteria
*/
public Criteria in(Object... o) {
return in(Arrays.asList(o));
}
/**
* The in operator is analogous to the SQL IN modifier, allowing you
* to specify an array of possible matches.
*
* @param c the collection containing the values to match against
* @return the criteria
*/
public Criteria in(Collection c) {
notNull(c, "collection can not be null");
this.criteriaType = CriteriaType.IN;
this.right = c;
return this;
}
/**
* The nin operator is similar to $in except that it selects objects for
* which the specified field does not have any value in the specified array.
*
* @param o the values to match against
* @return the criteria
*/
public Criteria nin(Object... o) {
return nin(Arrays.asList(o));
}
/**
* The nin operator is similar to $in except that it selects objects for
* which the specified field does not have any value in the specified array.
*
* @param c the values to match against
* @return the criteria
*/
public Criteria nin(Collection c) {
notNull(c, "collection can not be null");
this.criteriaType = CriteriaType.NIN;
this.right = c;
return this;
}
/**
* The all operator is similar to $in, but instead of matching any value
* in the specified array all values in the array must be matched.
*
* @param o
* @return the criteria
*/
public Criteria all(Object... o) {
return all(Arrays.asList(o));
}
/**
* The all operator is similar to $in, but instead of matching any value
* in the specified array all values in the array must be matched.
*
* @param c
* @return the criteria
*/
public Criteria all(Collection c) {
notNull(c, "collection can not be null");
this.criteriaType = CriteriaType.ALL;
this.right = c;
return this;
}
/**
* The size operator matches:
*
*
* - array with the specified number of elements.
* - string with given length.
*
*
* @param size
* @return the criteria
*/
public Criteria size(int size) {
this.criteriaType = CriteriaType.SIZE;
this.right = size;
return this;
}
/**
* Check for existence (or lack thereof) of a field.
*
* @param b
* @return the criteria
*/
public Criteria exists(boolean b) {
this.criteriaType = CriteriaType.EXISTS;
this.right = b;
return this;
}
/**
* The $type operator matches values based on their Java type.
*
* @param t
* @return the criteria
*/
public Criteria type(Class t) {
notNull(t, "type can not be null");
this.criteriaType = CriteriaType.TYPE;
this.right = t;
return this;
}
/**
* The notEmpty operator checks that an array or String is not empty.
*
* @return the criteria
*/
public Criteria notEmpty() {
this.criteriaType = CriteriaType.NOT_EMPTY;
this.right = null;
return this;
}
/**
* The matches operator checks that an object matches the given predicate.
*
* @param p
* @return the criteria
*/
public Criteria matches(Predicate p) {
this.criteriaType = CriteriaType.MATCHES;
this.right = p;
return this;
}
private static boolean isPath(String string){
return (string != null
&& (string.startsWith("$") || string.startsWith("@") || string.startsWith("!@")));
}
private static boolean isString(String string){
return (string != null && !string.isEmpty() && string.charAt(0) == '\'' && string.charAt(string.length() - 1) == '\'');
}
private static boolean isPattern(String string){
return (string != null
&& !string.isEmpty()
&& string.charAt(0) == '/'
&& (string.charAt(string.length() - 1) == '/' || (string.charAt(string.length() - 2) == '/' && string.charAt(string.length() - 1) == 'i'))
);
}
private static Pattern compilePattern(String string) {
int lastIndex = string.lastIndexOf('/');
boolean ignoreCase = string.endsWith("i");
String regex = string.substring(1, lastIndex);
int flags = ignoreCase ? Pattern.CASE_INSENSITIVE : 0;
return Pattern.compile(regex, flags);
}
/**
* Parse the provided criteria
* @param criteria
* @return a criteria
*/
public static Criteria parse(String criteria){
int operatorIndex = -1;
String left = "";
String operator = "";
String right = "";
for (int y = 0; y < OPERATORS.length; y++) {
operatorIndex = criteria.indexOf(OPERATORS[y]);
if (operatorIndex != -1) {
operator = OPERATORS[y];
break;
}
}
if (!operator.isEmpty()) {
left = criteria.substring(0, operatorIndex).trim();
right = criteria.substring(operatorIndex + operator.length()).trim();
} else {
left = criteria.trim();
}
return Criteria.create(left, operator, right);
}
/**
* Creates a new criteria
* @param left path to evaluate in criteria
* @param operator operator
* @param right expected value
* @return a new Criteria
*/
public static Criteria create(String left, String operator, String right) {
Object leftPrepared = left;
Object rightPrepared = right;
Path leftPath = null;
Path rightPath = null;
boolean existsCheck = true;
if(isPath(left)){
if(left.charAt(0) == '!'){
existsCheck = false;
left = left.substring(1);
}
leftPath = PathCompiler.compile(left);
if(!leftPath.isDefinite()){
throw new InvalidPathException("the predicate path: " + left + " is not definite");
}
leftPrepared = leftPath;
} else if(isString(left)) {
leftPrepared = left.substring(1, left.length() - 1);
} else if(isPattern(left)){
leftPrepared = compilePattern(left);
}
if(isPath(right)){
if(right.charAt(0) == '!'){
throw new InvalidPathException("Invalid negation! Can only be used for existence check e.g [?([email protected])]");
}
rightPath = PathCompiler.compile(right);
if(!rightPath.isDefinite()){
throw new InvalidPathException("the predicate path: " + right + " is not definite");
}
rightPrepared = rightPath;
} else if(isString(right)) {
rightPrepared = right.substring(1, right.length() - 1);
} else if(isPattern(right)){
rightPrepared = compilePattern(right);
}
if(leftPath != null && operator.isEmpty()){
return Criteria.where(leftPath).exists(existsCheck);
} else {
return new Criteria(leftPrepared, CriteriaType.parse(operator), rightPrepared);
}
}
private static int safeCompare(Object left, Object right) throws ValueCompareException {
if(left == right){
return 0;
}
boolean leftNullish = isNullish(left);
boolean rightNullish = isNullish(right);
if (leftNullish && !rightNullish) {
return -1;
} else if (!leftNullish && rightNullish) {
return 1;
} else if (leftNullish && rightNullish) {
return 0;
} else if (left instanceof String && right instanceof String) {
return ((String) left).compareTo((String) right);
} else if (left instanceof Number && right instanceof Number) {
return new BigDecimal(left.toString()).compareTo(new BigDecimal(right.toString()));
} else if (left instanceof String && right instanceof Number) {
return new BigDecimal(left.toString()).compareTo(new BigDecimal(right.toString()));
} else if (left instanceof String && right instanceof Boolean) {
Boolean e = Boolean.valueOf((String) left);
Boolean a = (Boolean) right;
return e.compareTo(a);
} else if (left instanceof Boolean && right instanceof Boolean) {
Boolean e = (Boolean) left;
Boolean a = (Boolean) right;
return e.compareTo(a);
} else {
logger.debug("Can not compare a {} with a {}", left.getClass().getName(), right.getClass().getName());
throw new ValueCompareException();
}
}
private static boolean isNullish(Object o) {
return (o == null || ((o instanceof String) && ("null".equals(o))));
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(left.toString())
//.append("|")
.append(criteriaType.toString())
//.append("|")
.append(wrapString(right));
//.append("|");
return sb.toString();
}
private static String wrapString(Object o){
if(o == null){
return "null";
}
if(o instanceof String){
return "'" + o.toString() + "'";
} else {
return o.toString();
}
}
}