com.google.template.soy.data.internal.ListBackedList.java Source code

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Here is the source code for com.google.template.soy.data.internal.ListBackedList.java

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/*
 * Copyright 2013 Google Inc.
 *
 * 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.google.template.soy.data.internal;

import com.google.common.collect.Lists;
import com.google.template.soy.data.SoyAbstractList;
import com.google.template.soy.data.SoyValue;
import com.google.template.soy.data.SoyValueProvider;

import java.util.Collections;
import java.util.List;

import javax.annotation.Nonnull;
import javax.annotation.ParametersAreNonnullByDefault;

/**
 * Internal implementation of SoyList in terms of a list. Do not use directly.
 *
 * <p>There are two implementations - SoyEasyList which creates its own list and supports
 * modification via the API, and ListImpl, which wraps existing lists.
 *
 * <p>Important: Do not use outside of Soy code (treat as superpackage-private).
 *
 */
@ParametersAreNonnullByDefault
abstract class ListBackedList extends SoyAbstractList {

    /** Backing list of providers. */
    protected final List<? extends SoyValueProvider> providerList;

    /** Constructs as a view of the given list. */
    protected ListBackedList(List<? extends SoyValueProvider> providerList) {
        this.providerList = providerList;
    }

    @Override
    public final int length() {
        return providerList.size();
    }

    @Nonnull
    @Override
    public final List<? extends SoyValueProvider> asJavaList() {
        return Collections.unmodifiableList(providerList);
    }

    @Nonnull
    @Override
    public final List<SoyValue> asResolvedJavaList() {
        return Lists.transform(asJavaList(), Transforms.RESOLVE_FUNCTION);
    }

    @Override
    public final SoyValueProvider getProvider(int index) {
        try {
            return providerList.get(index);
        } catch (IndexOutOfBoundsException e) {
            return null;
        }
    }
}