com.facebook.buck.step.CompositeStep.java Source code

Introduction

Here is the source code for com.facebook.buck.step.CompositeStep.java

Source

/*
 * Copyright 2012-present Facebook, 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.facebook.buck.step;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;

import java.util.Iterator;
import java.util.List;

public class CompositeStep implements Step, Iterable<Step> {

    private final ImmutableList<Step> steps;

    public CompositeStep(List<? extends Step> commands) {
        Preconditions.checkNotNull(commands);
        Preconditions.checkArgument(!commands.isEmpty(), "Must have at least one command");
        this.steps = ImmutableList.copyOf(commands);
    }

    @Override
    public int execute(ExecutionContext context) {
        for (Step step : steps) {
            int exitCode = step.execute(context);
            if (exitCode != 0) {
                return exitCode;
            }
        }
        return 0;
    }

    @Override
    public String getDescription(final ExecutionContext context) {
        return Joiner.on(" && ").join(Iterables.transform(steps, new Function<Step, String>() {
            @Override
            public String apply(Step step) {
                return step.getDescription(context);
            }
        }));
    }

    @Override
    public String getShortName() {
        return Joiner.on("_&&_").join(Iterables.transform(steps, new Function<Step, String>() {
            @Override
            public String apply(Step step) {
                return step.getShortName();
            }
        }));
    }

    @Override
    public Iterator<Step> iterator() {
        return steps.iterator();
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        } else if (this == obj) {
            return true;
        } else if (!(getClass() == obj.getClass())) {
            return false;
        }

        CompositeStep that = (CompositeStep) obj;
        return Objects.equal(this.steps, that.steps);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(steps);
    }
}