brooklyn.event.feed.ssh.SshValueFunctions.java Source code

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Here is the source code for brooklyn.event.feed.ssh.SshValueFunctions.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 brooklyn.event.feed.ssh;

import javax.annotation.Nullable;

import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.base.Predicates;

public class SshValueFunctions {

    public static Function<SshPollValue, Integer> exitStatus() {
        return new Function<SshPollValue, Integer>() {
            @Override
            public Integer apply(SshPollValue input) {
                return input.getExitStatus();
            }
        };
    }

    public static Function<SshPollValue, String> stdout() {
        return new Function<SshPollValue, String>() {
            @Override
            public String apply(SshPollValue input) {
                return input.getStdout();
            }
        };
    }

    public static Function<SshPollValue, String> stderr() {
        return new Function<SshPollValue, String>() {
            @Override
            public String apply(SshPollValue input) {
                return input.getStderr();
            }
        };
    }

    public static Function<SshPollValue, Boolean> exitStatusEquals(final int expected) {
        return chain(SshValueFunctions.exitStatus(), Functions.forPredicate(Predicates.equalTo(expected)));
    }

    // TODO Do we want these chain methods? Does guava have them already? Duplicated in HttpValueFunctions.
    public static <A, B, C> Function<A, C> chain(final Function<A, ? extends B> f1, final Function<B, C> f2) {
        return new Function<A, C>() {
            @Override
            public C apply(@Nullable A input) {
                return f2.apply(f1.apply(input));
            }
        };
    }

    public static <A, B, C, D> Function<A, D> chain(final Function<A, ? extends B> f1,
            final Function<B, ? extends C> f2, final Function<C, D> f3) {
        return new Function<A, D>() {
            @Override
            public D apply(@Nullable A input) {
                return f3.apply(f2.apply(f1.apply(input)));
            }
        };
    }
}