com.google.template.soy.jssrc.dsl.SwitchBuilder.java Source code

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Here is the source code for com.google.template.soy.jssrc.dsl.SwitchBuilder.java

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/*
 * Copyright 2017 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.jssrc.dsl;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import javax.annotation.Nullable;

/** Builds a {@link Switch} statement. */
public final class SwitchBuilder {
    private final CodeChunk.WithValue switchOn;
    private final ImmutableList.Builder<Switch.CaseClause> clauses = ImmutableList.builder();
    @Nullable
    private CodeChunk defaultCaseBody;

    SwitchBuilder(CodeChunk.WithValue switchOn) {
        this.switchOn = switchOn;
    }

    /**
     * Adds a case clause (one or more {@code case} labels followed by a body) to this switch
     * statement.
     */
    public SwitchBuilder case_(ImmutableList<CodeChunk.WithValue> caseLabels, CodeChunk body) {
        Preconditions.checkState(!caseLabels.isEmpty(), "at least one case required");
        clauses.add(new Switch.CaseClause(caseLabels, body));
        return this;
    }

    /** Adds a {@code default} clause to this switch statement. */
    public SwitchBuilder default_(CodeChunk body) {
        Preconditions.checkState(defaultCaseBody == null);
        defaultCaseBody = body;
        return this;
    }

    /** Finishes building this switch statement. */
    public CodeChunk build() {
        return Switch.create(switchOn, clauses.build(), defaultCaseBody);
    }
}