111 lines
3.4 KiB
Java
111 lines
3.4 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.ahat;
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import java.net.URI;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.TreeMap;
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/**
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* A class for getting and modifying query parameters.
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*/
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class Query {
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private URI mUri;
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// Map from parameter name to value. If the same parameter appears multiple
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// times, only the last value is used.
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private Map<String, String> mParams;
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public Query(URI uri) {
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mUri = uri;
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mParams = new HashMap<String, String>();
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String query = uri.getQuery();
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if (query != null) {
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for (String param : query.split("&")) {
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int i = param.indexOf('=');
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if (i < 0) {
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mParams.put(param, "");
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} else {
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mParams.put(param.substring(0, i), param.substring(i + 1));
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}
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}
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}
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}
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/**
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* Return the value of a query parameter with the given name.
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* If there is no query parameter with that name, returns the default value.
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* If there are multiple query parameters with that name, the value of the
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* last query parameter is returned.
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* If the parameter is defined with an empty value, "" is returned.
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*/
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public String get(String name, String defaultValue) {
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String value = mParams.get(name);
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return (value == null) ? defaultValue : value;
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}
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/**
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* Return the long value of a query parameter with the given name.
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*/
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public long getLong(String name, long defaultValue) {
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String value = get(name, null);
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return value == null ? defaultValue : Long.parseLong(value);
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}
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/**
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* Return the int value of a query parameter with the given name.
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*/
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public int getInt(String name, int defaultValue) {
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String value = get(name, null);
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return value == null ? defaultValue : Integer.parseInt(value);
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}
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/**
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* Return a uri suitable for an href target that links to the current
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* page, except with the named query parameter set to the new value.
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*
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* The generated parameters will be sorted alphabetically so it is easier to
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* test.
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*/
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public URI with(String name, String value) {
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StringBuilder newQuery = new StringBuilder();
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newQuery.append(mUri.getRawPath());
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newQuery.append('?');
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Map<String, String> params = new TreeMap<String, String>(mParams);
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params.put(name, value);
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String and = "";
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for (Map.Entry<String, String> entry : params.entrySet()) {
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newQuery.append(and);
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newQuery.append(entry.getKey());
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newQuery.append('=');
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newQuery.append(entry.getValue());
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and = "&";
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}
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return DocString.uri(newQuery.toString());
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}
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/**
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* Return a uri suitable for an href target that links to the current
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* page, except with the named query parameter set to the new long value.
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*/
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public URI with(String name, long value) {
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return with(name, String.valueOf(value));
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}
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}
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