com.android.tools.idea.ui.properties.expressions.list.MapExpression.java Source code

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Here is the source code for com.android.tools.idea.ui.properties.expressions.list.MapExpression.java

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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.tools.idea.ui.properties.expressions.list;

import com.android.tools.idea.ui.properties.collections.ObservableList;
import com.google.common.collect.Lists;
import org.jetbrains.annotations.NotNull;

import java.util.List;

/**
 * An expression which maps one list to another.
 */
public abstract class MapExpression<S, D> extends ListExpression<S, D> {
    private final ObservableList<? extends S> mySourceList;

    protected MapExpression(ObservableList<? extends S> sourceList) {
        super(sourceList);

        mySourceList = sourceList;
    }

    @NotNull
    @Override
    public final List<? extends D> get() {
        List<D> mappedList = Lists.newArrayListWithCapacity(mySourceList.size());
        for (S srcElement : mySourceList) {
            mappedList.add(transform(srcElement));
        }
        return mappedList;
    }

    @NotNull
    protected abstract D transform(@NotNull S srcElement);
}