StringNodes.java
/*
* Copyright 2022 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 androidx.wear.protolayout.expression.pipeline;
import static java.lang.Math.min;
import androidx.annotation.UiThread;
import androidx.wear.protolayout.expression.proto.DynamicProto.StateStringSource;
import androidx.wear.protolayout.expression.proto.FixedProto.FixedString;
/** Dynamic data nodes which yield Strings. */
class StringNodes {
static final int MAXIMUM_STRING_LENGTH = 200;
private StringNodes() {}
/** Dynamic string node that has a fixed value. */
static class FixedStringNode implements DynamicDataSourceNode<String> {
private final String mValue;
private final DynamicTypeValueReceiverWithPreUpdate<String> mDownstream;
FixedStringNode(
FixedString protoNode, DynamicTypeValueReceiverWithPreUpdate<String> downstream) {
this.mValue = truncate(protoNode.getValue());
this.mDownstream = downstream;
}
@Override
@UiThread
public void preInit() {
mDownstream.onPreUpdate();
}
@Override
@UiThread
public void init() {
mDownstream.onData(mValue);
}
@Override
@UiThread
public void destroy() {}
}
/** Dynamic string node that gets a value from integer. */
static class Int32FormatNode extends DynamicDataTransformNode<Integer, String> {
Int32FormatNode(
NumberFormatter formatter,
DynamicTypeValueReceiverWithPreUpdate<String> downstream) {
super(downstream, (value) -> truncate(formatter.format(value)));
}
}
/** Dynamic string node that gets a value from the other strings. */
static class StringConcatOpNode extends DynamicDataBiTransformNode<String, String, String> {
StringConcatOpNode(DynamicTypeValueReceiverWithPreUpdate<String> downstream) {
super(
downstream,
(lhs, rhs) -> {
int lhsLength = lhs.length();
int rhsLength = rhs.length();
if (lhsLength >= MAXIMUM_STRING_LENGTH) {
return truncate(lhs);
}
return lhs.concat(
rhs.substring(
0, min(rhsLength, MAXIMUM_STRING_LENGTH - lhsLength)));
});
}
}
/** Dynamic string node that gets a value from float. */
static class FloatFormatNode extends DynamicDataTransformNode<Float, String> {
FloatFormatNode(
NumberFormatter formatter,
DynamicTypeValueReceiverWithPreUpdate<String> downstream) {
super(downstream, (value) -> truncate(formatter.format(value)));
}
}
/** Dynamic string node that gets a value from the state. */
static class StateStringNode extends StateSourceNode<String> {
StateStringNode(
StateStore stateStore,
StateStringSource protoNode,
DynamicTypeValueReceiverWithPreUpdate<String> downstream) {
super(
stateStore,
protoNode.getSourceKey(),
se -> truncate(se.getStringVal().getValue()),
downstream);
}
}
static String truncate(String input) {
return input.substring(0, min(input.length(), MAXIMUM_STRING_LENGTH));
}
}