/**
* Copyright (C) 2010-2011 J.W.Marsden
*
* 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 jsonij.json.jpath;
import java.lang.reflect.Array;
import java.util.ArrayList;
import jsonij.json.JSON;
import jsonij.json.Value;
import jsonij.json.jpath.ExpressionPredicate.ExpressionPredicateCondition;
import jsonij.json.jpath.ExpressionPredicate.ExpressionPredicateOperator;
/**
* JPath implementation. Inspired by XPath and <a href="http://goessner.net/articles/JsonPath/">JsonPath</a>.
*
* @author J.W.Marsden
*/
public class JPathImp<C extends Component> extends ArrayList<C> {
boolean recordEvaluateTime;
long lastEvaluateTime;
public JPathImp() {
recordEvaluateTime = false;
lastEvaluateTime = -1;
}
public Value evaluate(JSON json) throws JPathRuntimeException {
Value value = json.getRoot();
return evaluate(value);
}
public Value[] evaluateAll(JSON json) throws JPathRuntimeException {
Value value = json.getRoot();
return evaluateAll(value);
}
public Value evaluate(Value value) throws JPathRuntimeException {
Value[] returnValues = evaluateAll(value);
if (Array.getLength(returnValues) > 0) {
return returnValues[0];
} else {
return null;
}
}
public Value[] evaluateAll(Value value) throws JPathRuntimeException {
long startTime = 0, finishTime = -1;
if (recordEvaluateTime) {
startTime = System.nanoTime();
}
ArrayList<Value> currentValues = new ArrayList<Value>();
ArrayList<Value> nextValues = null;
currentValues.add(value);
int count = 0;
for (int i = 0; i < size(); i++) {
Component c = get(i);
nextValues = new ArrayList<Value>();
if (c.getClass() == SearchComponent.class) {
throw new JPathRuntimeException("notSupported", SearchComponent.class);
}
c.evaluate(currentValues, nextValues);
currentValues = nextValues;
count++;
}
if (recordEvaluateTime) {
finishTime = System.nanoTime();
lastEvaluateTime = finishTime - startTime;
}
int size = currentValues.size();
Value[] returnValues = new Value[size];
for (int i = 0; i < size; i++) {
returnValues[i] = currentValues.get(i);
}
return returnValues;
}
public boolean isRecordEvaluateTime() {
return recordEvaluateTime;
}
public void setRecordEvaluateTime(boolean recordEvaluateTime) {
this.recordEvaluateTime = recordEvaluateTime;
}
public long getLastEvaluateTime() {
return lastEvaluateTime / 1000L;
}
}