com.jayway.jsonpath.internal.path.ScanPathToken Maven / Gradle / Ivy
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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.internal.path;
import com.jayway.jsonpath.Option;
import com.jayway.jsonpath.internal.PathRef;
import com.jayway.jsonpath.spi.json.JsonProvider;
import java.util.Collection;
/**
*
*/
public class ScanPathToken extends PathToken {
ScanPathToken() {
}
@Override
public void evaluate(String currentPath, PathRef parent, Object model, EvaluationContextImpl ctx) {
PathToken pt = next();
walk(pt, currentPath, parent, model, ctx, createScanPredicate(pt, ctx));
}
public static void walk(PathToken pt, String currentPath, PathRef parent, Object model, EvaluationContextImpl ctx, Predicate predicate) {
if (ctx.jsonProvider().isMap(model)) {
walkObject(pt, currentPath, parent, model, ctx, predicate);
} else if (ctx.jsonProvider().isArray(model)) {
walkArray(pt, currentPath, parent, model, ctx, predicate);
}
}
public static void walkArray(PathToken pt, String currentPath, PathRef parent, Object model, EvaluationContextImpl ctx, Predicate predicate) {
if (predicate.matches(model)) {
if (pt.isLeaf()) {
pt.evaluate(currentPath, parent, model, ctx);
} else {
PathToken next = pt.next();
Iterable models = ctx.jsonProvider().toIterable(model);
int idx = 0;
for (Object evalModel : models) {
String evalPath = currentPath + "[" + idx + "]";
next.evaluate(evalPath, parent, evalModel, ctx);
idx++;
}
}
}
Iterable models = ctx.jsonProvider().toIterable(model);
int idx = 0;
for (Object evalModel : models) {
String evalPath = currentPath + "[" + idx + "]";
walk(pt, evalPath, PathRef.create(model, idx), evalModel, ctx, predicate);
idx++;
}
}
public static void walkObject(PathToken pt, String currentPath, PathRef parent, Object model, EvaluationContextImpl ctx, Predicate predicate) {
if (predicate.matches(model)) {
pt.evaluate(currentPath, parent, model, ctx);
}
Collection properties = ctx.jsonProvider().getPropertyKeys(model);
for (String property : properties) {
String evalPath = currentPath + "['" + property + "']";
Object propertyModel = ctx.jsonProvider().getMapValue(model, property);
if (propertyModel != JsonProvider.UNDEFINED) {
walk(pt, evalPath, PathRef.create(model, property), propertyModel, ctx, predicate);
}
}
}
private static Predicate createScanPredicate(final PathToken target, final EvaluationContextImpl ctx) {
if (target instanceof PropertyPathToken) {
return new PropertyPathTokenPredicate(target, ctx);
} else if (target instanceof ArrayPathToken) {
return new ArrayPathTokenPredicate(ctx);
} else if (target instanceof WildcardPathToken) {
return new WildcardPathTokenPredicate();
} else if (target instanceof PredicatePathToken) {
return new FilterPathTokenPredicate(target, ctx);
} else {
return FALSE_PREDICATE;
}
}
@Override
public boolean isTokenDefinite() {
return false;
}
@Override
public String getPathFragment() {
return "..";
}
private interface Predicate {
boolean matches(Object model);
}
private static final Predicate FALSE_PREDICATE = new Predicate() {
@Override
public boolean matches(Object model) {
return false;
}
};
private static final class FilterPathTokenPredicate implements Predicate {
private final EvaluationContextImpl ctx;
private PredicatePathToken predicatePathToken;
private FilterPathTokenPredicate(PathToken target, EvaluationContextImpl ctx) {
this.ctx = ctx;
predicatePathToken = (PredicatePathToken) target;
}
@Override
public boolean matches(Object model) {
return predicatePathToken.accept(model, ctx.rootDocument(), ctx.configuration(), ctx);
}
}
private static final class WildcardPathTokenPredicate implements Predicate {
@Override
public boolean matches(Object model) {
return true;
}
}
private static final class ArrayPathTokenPredicate implements Predicate {
private final EvaluationContextImpl ctx;
private ArrayPathTokenPredicate(EvaluationContextImpl ctx) {
this.ctx = ctx;
}
@Override
public boolean matches(Object model) {
return ctx.jsonProvider().isArray(model);
}
}
private static final class PropertyPathTokenPredicate implements Predicate {
private final EvaluationContextImpl ctx;
private PropertyPathToken propertyPathToken;
private PropertyPathTokenPredicate(PathToken target, EvaluationContextImpl ctx) {
this.ctx = ctx;
propertyPathToken = (PropertyPathToken) target;
}
@Override
public boolean matches(Object model) {
if (! ctx.jsonProvider().isMap(model)) {
return false;
}
//
// The commented code below makes it really hard understand, use and predict the result
// of deep scanning operations. It might be correct but was decided to be
// left out until the behavior of REQUIRE_PROPERTIES is more strictly defined
// in a deep scanning scenario. For details read conversation in commit
// https://github.com/jayway/JsonPath/commit/1a72fc078deb16995e323442bfb681bd715ce45a#commitcomment-14616092
//
// if (ctx.options().contains(Option.REQUIRE_PROPERTIES)) {
// // Have to require properties defined in path when an indefinite path is evaluated,
// // so have to go there and search for it.
// return true;
// }
if (! propertyPathToken.isTokenDefinite()) {
// It's responsibility of PropertyPathToken code to handle indefinite scenario of properties,
// so we'll allow it to do its job.
return true;
}
if (propertyPathToken.isLeaf() && ctx.options().contains(Option.DEFAULT_PATH_LEAF_TO_NULL)) {
// In case of DEFAULT_PATH_LEAF_TO_NULL missing properties is not a problem.
return true;
}
Collection keys = ctx.jsonProvider().getPropertyKeys(model);
return keys.containsAll(propertyPathToken.getProperties());
}
}
}