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/*
* 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.InvalidPathException;
import com.jayway.jsonpath.PathNotFoundException;
import com.jayway.jsonpath.internal.PathRef;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static java.lang.String.format;
/**
*
*/
public class ArrayPathToken extends PathToken {
private static final Logger logger = LoggerFactory.getLogger(ArrayPathToken.class);
private final ArraySliceOperation arraySliceOperation;
private final ArrayIndexOperation arrayIndexOperation;
ArrayPathToken(final ArraySliceOperation arraySliceOperation) {
this.arraySliceOperation = arraySliceOperation;
this.arrayIndexOperation = null;
}
ArrayPathToken(final ArrayIndexOperation arrayIndexOperation) {
this.arrayIndexOperation = arrayIndexOperation;
this.arraySliceOperation = null;
}
@Override
public void evaluate(String currentPath, PathRef parent, Object model, EvaluationContextImpl ctx) {
if (! checkArrayModel(currentPath, model, ctx))
return;
if(arraySliceOperation != null){
evaluateSliceOperation(currentPath, parent, model, ctx);
} else {
evaluateIndexOperation(currentPath, parent, model, ctx);
}
}
public void evaluateIndexOperation(String currentPath, PathRef parent, Object model, EvaluationContextImpl ctx) {
if (! checkArrayModel(currentPath, model, ctx))
return;
if(arrayIndexOperation.isSingleIndexOperation()){
handleArrayIndex(arrayIndexOperation.indexes().get(0), currentPath, model, ctx);
} else {
for (Integer index : arrayIndexOperation.indexes()) {
handleArrayIndex(index, currentPath, model, ctx);
}
}
}
public void evaluateSliceOperation(String currentPath, PathRef parent, Object model, EvaluationContextImpl ctx) {
if (! checkArrayModel(currentPath, model, ctx))
return;
switch (arraySliceOperation.operation()) {
case SLICE_FROM:
sliceFrom(arraySliceOperation, currentPath, parent, model, ctx);
break;
case SLICE_BETWEEN:
sliceBetween(arraySliceOperation, currentPath, parent, model, ctx);
break;
case SLICE_TO:
sliceTo(arraySliceOperation, currentPath, parent, model, ctx);
break;
}
}
public void sliceFrom(ArraySliceOperation operation, String currentPath, PathRef parent, Object model, EvaluationContextImpl ctx) {
int length = ctx.jsonProvider().length(model);
int from = operation.from();
if (from < 0) {
//calculate slice start from array length
from = length + from;
}
from = Math.max(0, from);
logger.debug("Slice from index on array with length: {}. From index: {} to: {}. Input: {}", length, from, length - 1, toString());
if (length == 0 || from >= length) {
return;
}
for (int i = from; i < length; i++) {
handleArrayIndex(i, currentPath, model, ctx);
}
}
public void sliceBetween(ArraySliceOperation operation, String currentPath, PathRef parent, Object model, EvaluationContextImpl ctx) {
int length = ctx.jsonProvider().length(model);
int from = operation.from();
int to = operation.to();
to = Math.min(length, to);
if (from >= to || length == 0) {
return;
}
logger.debug("Slice between indexes on array with length: {}. From index: {} to: {}. Input: {}", length, from, to, toString());
for (int i = from; i < to; i++) {
handleArrayIndex(i, currentPath, model, ctx);
}
}
public void sliceTo(ArraySliceOperation operation, String currentPath, PathRef parent, Object model, EvaluationContextImpl ctx) {
int length = ctx.jsonProvider().length(model);
if (length == 0) {
return;
}
int to = operation.to();
if (to < 0) {
//calculate slice end from array length
to = length + to;
}
to = Math.min(length, to);
logger.debug("Slice to index on array with length: {}. From index: 0 to: {}. Input: {}", length, to, toString());
for (int i = 0; i < to; i++) {
handleArrayIndex(i, currentPath, model, ctx);
}
}
@Override
public String getPathFragment() {
if(arrayIndexOperation != null){
return arrayIndexOperation.toString();
} else {
return arraySliceOperation.toString();
}
}
@Override
public boolean isTokenDefinite() {
if(arrayIndexOperation != null){
return arrayIndexOperation.isSingleIndexOperation();
} else {
return false;
}
}
/**
* Check if model is non-null and array.
* @param currentPath
* @param model
* @param ctx
* @return false if current evaluation call must be skipped, true otherwise
* @throws PathNotFoundException if model is null and evaluation must be interrupted
* @throws InvalidPathException if model is not an array and evaluation must be interrupted
*/
protected boolean checkArrayModel(String currentPath, Object model, EvaluationContextImpl ctx) {
if (model == null){
if (! isUpstreamDefinite()) {
return false;
} else {
throw new PathNotFoundException("The path " + currentPath + " is null");
}
}
if (!ctx.jsonProvider().isArray(model)) {
if (! isUpstreamDefinite()) {
return false;
} else {
throw new PathNotFoundException(format("Filter: %s can only be applied to arrays. Current context is: %s", toString(), model));
}
}
return true;
}
}
