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ElementParser.java
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96 lines (86 loc) · 3.06 KB
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/* Copyright (c) 2008 Google Inc.
*
* 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 sample.contacts;
import java.util.EnumMap;
import java.util.Map;
/**
* Parser to tokenize element descriptions.
* The general format of an element specification looks like:
* [<value>]|[<name_1>:<value_1>][,<name_2>:<value_2>]...[,<name_n>:<value_n>]
*
* For convenience a single unnamed value can be specified. It is treated as
* "value:<value>", and the parsed value can be accessed with the VALUE key.
*
*
*/
class ElementParser {
// Map of parsed property names and values.
private Map<PropertyName, String> propertyMap;
/**
* Constructor.
* Parses the element description, and fills the propertyMap.
*
* @param elementDesc the element description.
* @throws IllegalArgumentException on badly formated element description.
*/
ElementParser(String elementDesc) throws IllegalArgumentException {
propertyMap = new EnumMap<PropertyName, String>(PropertyName.class);
for (String propertyDesc : elementDesc.split(",")) {
String nameValuePair[] = propertyDesc.split(":", 2);
if (nameValuePair.length == 1) {
propertyMap.put(PropertyName.VALUE, propertyDesc);
} else if (nameValuePair.length == 2){
propertyMap.put(
PropertyName.valueOf(nameValuePair[0].toUpperCase()),
nameValuePair[1]);
} else {
throw new IllegalArgumentException("Badly formated property:"
+ propertyDesc);
}
}
}
/**
* Checks if the given property has a parsed in value.
*
* @param property the property.
* @return {@code true} if the given property has a parsed in value,
* otherwise {@code false}
*/
boolean has(PropertyName property) {
return propertyMap.containsKey(property);
}
/**
* Retrieves the parsed in value for the given property.
*
* @param property the property.
* @return the parsed in value for the given property, or {@code null} if
* the given property was not specified in the element description
* string.
*/
String get(PropertyName property) {
return propertyMap.get(property);
}
/**
* Convenience method to check the value of a boolean property.
*
* @param property the property.
* @return {@code true} if the parsed in value of the given property is "true"
* {@code false} in any other cases.
*/
boolean is(PropertyName property) {
String value = propertyMap.get(property);
return (value != null) && (value.toLowerCase().equals("true"));
}
}