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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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.android.ahat;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
/**
* A class for getting and modifying query parameters.
*/
class Query {
private URI mUri;
// Map from parameter name to value. If the same parameter appears multiple
// times, only the last value is used.
private Map<String, String> mParams;
public Query(URI uri) {
mUri = uri;
mParams = new HashMap<String, String>();
String query = uri.getQuery();
if (query != null) {
for (String param : query.split("&")) {
int i = param.indexOf('=');
if (i < 0) {
mParams.put(param, "");
} else {
mParams.put(param.substring(0, i), param.substring(i + 1));
}
}
}
}
/**
* Return the value of a query parameter with the given name.
* If there is no query parameter with that name, returns the default value.
* If there are multiple query parameters with that name, the value of the
* last query parameter is returned.
* If the parameter is defined with an empty value, "" is returned.
*/
public String get(String name, String defaultValue) {
String value = mParams.get(name);
return (value == null) ? defaultValue : value;
}
/**
* Return the long value of a query parameter with the given name.
*/
public long getLong(String name, long defaultValue) {
String value = get(name, null);
return value == null ? defaultValue : Long.parseLong(value);
}
/**
* Return the int value of a query parameter with the given name.
*/
public int getInt(String name, int defaultValue) {
String value = get(name, null);
return value == null ? defaultValue : Integer.parseInt(value);
}
/**
* Return a uri suitable for an href target that links to the current
* page, except with the named query parameter set to the new value.
*
* The generated parameters will be sorted alphabetically so it is easier to
* test.
*/
public URI with(String name, String value) {
StringBuilder newQuery = new StringBuilder();
newQuery.append(mUri.getRawPath());
newQuery.append('?');
Map<String, String> params = new TreeMap<String, String>(mParams);
params.put(name, value);
String and = "";
for (Map.Entry<String, String> entry : params.entrySet()) {
newQuery.append(and);
newQuery.append(entry.getKey());
newQuery.append('=');
newQuery.append(entry.getValue());
and = "&";
}
return DocString.uri(newQuery.toString());
}
/**
* Return a uri suitable for an href target that links to the current
* page, except with the named query parameter set to the new long value.
*/
public URI with(String name, long value) {
return with(name, String.valueOf(value));
}
}