/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.openejb.util;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
// only maps json objects, doesn't handle array, number, true/false/null
public final class SimpleJSonParser {
public static Object read(final InputStream is) throws IOException {
Map<String, Object> json = null;
Collection<Object> array = null;
int read;
char current;
while ((read = is.read()) != -1) {
current = (char) read; // cast after otherwise -1 test will likely fail if the input file is not correct
if (current == '{') {
json = new HashMap<String, Object>();
} else if (current == '}') {
return json;
} else if (current == '[') {
array = new ArrayList<Object>();
} else if (current == ']') {
return array;
} else if (current == '"') {
final StringBuilder b = new StringBuilder();
do {
read = is.read();
current = (char) read;
b.append(current);
} while (read != -1 && current != '\"');
if (read == -1) {
throw new IllegalArgumentException("String should be between \"");
}
final String value = PropertyPlaceHolderHelper.simpleValue(b.substring(0, b.length() - 1)); // remove last "
if (valueRead(is, json, array, value)) {
return value;
}
} else if (current != ':' && current != '=' && current != ',' && !isWhiteSpace(current)) {
final StringBuilder b = new StringBuilder().append(current);
do {
read = is.read();
current = (char) read;
b.append(current);
} while (read != -1 && !isWhiteSpace(current) && current != ',');
final String value = PropertyPlaceHolderHelper.simpleValue(b.substring(0, b.length() - 1)); // remove last character
if (valueRead(is, json, array, value)) {
return value;
}
}
// else skip
}
throw new IllegalArgumentException("Please check input, a } is probably missing");
}
private static boolean valueRead(final InputStream is, final Map<String, Object> json, final Collection<Object> array, final String value) throws IOException {
int read;
char c;
do {
read = is.read();
c = (char) read;
} while (read != -1 && c != ':' && c != '=' && (c == ',' || c == '\n' || c == '\r'));
if (json != null) {
json.put(value, read(is));
} else if (array != null) {
array.add(value);
} else {
return true;
}
return false;
}
private static boolean isWhiteSpace(final char current) {
return current == ' ' || current == '\n' || current == '\r' || current == '\t';
}
private SimpleJSonParser() {
// no-op
}
}