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/*
* Copyright (C) 2010 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.providers.contacts;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/**
* A convenience wrapper for a projection map. Makes it easier to create and use projection maps.
*/
public class ProjectionMap extends HashMap<String, String> {
public static class Builder {
private ProjectionMap mMap = new ProjectionMap();
public Builder add(String column) {
mMap.putColumn(column, column);
return this;
}
public Builder add(String alias, String expression) {
mMap.putColumn(alias, expression + " AS " + alias);
return this;
}
public Builder addAll(ProjectionMap map) {
for (Map.Entry<String, String> entry : map.entrySet()) {
mMap.putColumn(entry.getKey(), entry.getValue());
}
return this;
}
public ProjectionMap build() {
String[] columns = new String[mMap.size()];
mMap.keySet().toArray(columns);
Arrays.sort(columns);
mMap.mColumns = columns;
return mMap;
}
}
public String[] mColumns;
public static Builder builder() {
return new Builder();
}
/**
* Returns a sorted array of all column names in the projection map.
*/
public String[] getColumnNames() {
return mColumns;
}
private void putColumn(String alias, String column) {
super.put(alias, column);
}
@Override
public String put(String key, String value) {
throw new UnsupportedOperationException();
}
@Override
public void putAll(Map<? extends String, ? extends String> map) {
throw new UnsupportedOperationException();
}
}
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