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org.jsfr.json.path.JsonPath Maven / Gradle / Ivy
/*
* MIT License
*
* Copyright (c) 2019 WANG Lingsong
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.jsfr.json.path;
import org.jsfr.json.filter.JsonPathFilter;
import org.jsfr.json.resolver.DocumentResolver;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.NoSuchElementException;
public class JsonPath implements Iterable {
private static final int JSON_PATH_INITIAL_CAPACITY = 20;
private class JsonPathIterator implements Iterator {
private int current = 0;
@Override
public boolean hasNext() {
return current < size;
}
@Override
public PathOperator next() {
if (current >= size) {
throw new NoSuchElementException();
} else {
return operators[current++];
}
}
@Override
public void remove() {
throw new UnsupportedOperationException("unsupported");
}
}
@Override
public Iterator iterator() {
return new JsonPathIterator();
}
public static class Builder {
private JsonPath jsonPath;
public static Builder start() {
Builder builder = new Builder();
builder.jsonPath = new JsonPath();
return builder;
}
public static Builder startFilterPath() {
Builder builder = new Builder();
builder.jsonPath = new JsonPath(true);
return builder;
}
public Builder child(String key) {
jsonPath.push(new ChildNode(key));
return this;
}
public Builder children(String... children) {
jsonPath.push(new ChildrenNode(new HashSet(Arrays.asList(children))));
return this;
}
public Builder anyChild() {
jsonPath.push(Wildcard.SINGLETON);
return this;
}
public Builder index(int index) {
jsonPath.push(new ArrayIndex(index));
return this;
}
public Builder indexes(Integer... indexes) {
jsonPath.push(new ArrayIndexes(new HashSet(Arrays.asList(indexes))));
return this;
}
public Builder anyIndex() {
jsonPath.push(Wildcard.SINGLETON);
return this;
}
public Builder scan() {
jsonPath.definite = false;
if (!(jsonPath.peek().getType() == PathOperator.Type.DEEP_SCAN)) {
jsonPath.push(DeepScan.SINGLETON);
}
return this;
}
public Builder any() {
jsonPath.push(Wildcard.SINGLETON);
return this;
}
public Builder slicing(Integer lower, Integer upper) {
jsonPath.push(new ArraySlicing(lower, upper));
return this;
}
public Builder arrayFilter(JsonPathFilter jsonPathFilter) {
jsonPath.push(new ArrayFilter(jsonPathFilter));
return this;
}
public JsonPath build() {
if (jsonPath.peek().getType() == PathOperator.Type.DEEP_SCAN) {
throw new IllegalStateException("deep-scan shouldn't be the last operator.");
}
return this.jsonPath;
}
}
private boolean definite = true;
protected PathOperator[] operators;
protected int size;
protected JsonPath() {
this(false);
}
protected JsonPath(boolean filterPath) {
operators = new PathOperator[JSON_PATH_INITIAL_CAPACITY];
if (filterPath) {
operators[0] = FilterRoot.instance();
} else {
operators[0] = Root.instance();
}
size = 1;
}
public Object resolve(Object document, DocumentResolver resolver) {
if (!this.isDefinite()) {
throw new IllegalArgumentException("Indefinite JsonPath is not supported.");
}
Object current = document;
for (PathOperator pathOperator : this) {
if (current == null) {
return null;
}
current = pathOperator.resolve(current, resolver);
}
return current;
}
public boolean match(JsonPath jsonPath) {
int pointer1 = this.size - 1;
int pointer2 = jsonPath.size - 1;
if (!get(pointer1).match(jsonPath.get(pointer2))) {
return false;
}
pointer1--;
pointer2--;
while (pointer1 >= 0) {
if (!(pointer2 >= 0)) {
return false;
}
PathOperator o1 = this.get(pointer1--);
PathOperator o2 = jsonPath.get(pointer2--);
if (!o1.match(o2)) {
return false;
}
}
return !(pointer2 >= 0);
}
public boolean matchWithDeepScan(JsonPath jsonPath) {
int pointer1 = this.size - 1;
int pointer2 = jsonPath.size - 1;
if (!get(pointer1).match(jsonPath.get(pointer2))) {
return false;
}
pointer1--;
pointer2--;
while (pointer1 >= 0) {
if (!(pointer2 >= 0)) {
return false;
}
PathOperator o1 = this.get(pointer1--);
PathOperator o2 = jsonPath.get(pointer2--);
if (o1.getType() == PathOperator.Type.DEEP_SCAN) {
int blockHead = indexOfPreviousDeepScanOrRoot(this, pointer1);
int blockSize = pointer1 - blockHead;
int offset2 = pointer2 - blockSize + 2;
while (offset2 > 0 && !matchPathBlock(this, blockHead + 1, jsonPath, offset2, blockSize)) {
offset2--;
}
pointer1 = blockHead;
pointer2 = offset2 - 1;
} else {
if (!o1.match(o2)) {
return false;
}
}
}
return !(pointer2 >= 0);
}
private boolean matchPathBlock(JsonPath path1, int offset1, JsonPath path2, int offset2, int blockSize) {
for (int i = 0; i < blockSize; i++) {
if (!path1.get(offset1 + i).match(path2.get(offset2 + i))) {
return false;
}
}
return true;
}
private int indexOfPreviousDeepScanOrRoot(JsonPath path, int from) {
int pointer = from - 1;
while (pointer > 0) {
if (path.get(pointer).getType() == PathOperator.Type.DEEP_SCAN) {
return pointer;
} else {
pointer--;
}
}
return pointer;
}
private int indexOfPreviousDeepScanOrFilter(JsonPath path, int from) {
int pointer = from - 1;
while (pointer > 0) {
if (path.get(pointer).getType() == PathOperator.Type.DEEP_SCAN || path.get(pointer) instanceof ArrayFilter) {
return pointer;
} else {
pointer--;
}
}
return pointer;
}
public boolean matchFilterPath(JsonPath jsonPath, int startDepth) {
int pointer1 = this.size - 1;
int pointer2 = jsonPath.size - 1;
if (!get(pointer1).match(jsonPath.get(pointer2))) {
return false;
}
pointer1--;
pointer2--;
while (pointer1 >= 0) {
if (!(pointer2 >= 0)) {
return false;
}
PathOperator o1 = this.get(pointer1--);
PathOperator o2 = jsonPath.get(pointer2--);
// TODO Allow deep scan in filter path?
if (o1.getType() == PathOperator.Type.FILTER_ROOT && pointer2 + 2 == startDepth) {
return true;
} else {
if (!o1.match(o2)) {
return false;
}
}
}
return !(pointer2 >= 0);
}
public boolean matchFilterPathUntilDepth(JsonPath jsonPath, int startDepth) {
int pointer1 = this.size - 1;
int pointer2 = jsonPath.size - 1;
// if (!get(pointer1).match(jsonPath.get(pointer2))) {
// return false;
// }
// pointer1--;
// pointer2--;
while (pointer1 >= 0) {
if (!(pointer2 >= 0)) {
return false;
}
PathOperator o1 = this.get(pointer1--);
PathOperator o2 = jsonPath.get(pointer2--);
if (o1 instanceof ArrayFilter) {
return (pointer2 + 2 == startDepth);
}
if (o1.getType() == PathOperator.Type.DEEP_SCAN) {
int blockHead = indexOfPreviousDeepScanOrFilter(this, pointer1);
int blockSize = pointer1 - blockHead;
int offset2 = pointer2 - blockSize + 2;
while (offset2 > 0 && !matchPathBlock(this, blockHead + 1, jsonPath, offset2, blockSize)) {
offset2--;
}
pointer1 = blockHead;
pointer2 = offset2 - 1;
} else {
if (!o1.match(o2)) {
return false;
}
}
}
return !(pointer2 >= 0);
}
public JsonPath derivePath(int depth) {
JsonPath newPath = new JsonPath();
newPath.size = depth;
newPath.operators = this.operators;
return newPath;
}
public PathOperator get(int i) {
return operators[i];
}
public PathOperator peek() {
return operators[size - 1];
}
protected void push(PathOperator operator) {
ensureCapacity(size + 1);
operators[size++] = operator;
}
private void ensureCapacity(int capacity) {
if (operators.length < capacity) {
PathOperator[] newOperators = new PathOperator[operators.length * 2];
System.arraycopy(operators, 0, newOperators, 0, operators.length);
operators = newOperators;
}
}
protected void pop() {
size--;
}
public int pathDepth() {
return this.size;
}
public void clear() {
operators = null;
}
public static int minimumPathDepth(JsonPath path) {
if (path.definite) {
return path.pathDepth();
} else {
int minimumDepth = 0;
for (PathOperator operator : path) {
if (!(operator.getType() == PathOperator.Type.DEEP_SCAN)) {
minimumDepth++;
}
}
return minimumDepth;
}
}
public boolean isDefinite() {
return definite;
}
public boolean checkDefinite() {
for (PathOperator operator : this) {
if (operator.getType() == PathOperator.Type.DEEP_SCAN) {
this.definite = false;
return false;
}
}
return true;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
for (PathOperator operator : this) {
sb.append(operator);
}
return sb.toString();
}
}
