edu.oregonstate.eecs.mcplan.JointAction.java Source code

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Here is the source code for edu.oregonstate.eecs.mcplan.JointAction.java

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/* LICENSE
Copyright (c) 2013-2016, Jesse Hostetler (jessehostetler@gmail.com)
All rights reserved.
    
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    
1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
    
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/**
 * 
 */
package edu.oregonstate.eecs.mcplan;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.lang3.builder.HashCodeBuilder;

import edu.oregonstate.eecs.mcplan.util.Fn;
import edu.oregonstate.eecs.mcplan.util.Generator;

/**
 * @author jhostetler
 *
 */
public final class JointAction<A extends VirtualConstructor<A>>
        implements VirtualConstructor<JointAction<A>>, Iterable<A> {
    public static final class Builder<A extends VirtualConstructor<A>> {
        private final ArrayList<A> actions_;

        public Builder(final int nagents) {
            actions_ = new ArrayList<A>(nagents);
            for (int i = 0; i < nagents; ++i) {
                actions_.add(null);
            }
        }

        public Builder(final int nagents, final A nothing_action) {
            actions_ = new ArrayList<A>(nagents);
            for (int i = 0; i < nagents; ++i) {
                actions_.add(nothing_action.create());
            }
        }

        public Builder<A> a(final int turn, final A a) {
            actions_.set(turn, a);
            return this;
        }

        public JointAction<A> finish() {
            for (final A a : actions_) {
                assert (a != null);
            }
            return new JointAction<A>(actions_);
        }
    }

    /**
     * "Conditions" a JointAction collection on the value of the *last action*
     * (ie. the action with the largest index). The resulting
     * @param a
     * @param as
     * @return
     */
    public static final <A extends VirtualConstructor<A>> Generator<JointAction<A>> condition(final A a,
            final Generator<JointAction<A>> as) {
        return Fn.map(new Fn.Function1<JointAction<A>, JointAction<A>>() {
            @Override
            public JointAction<A> apply(final JointAction<A> a) {
                final JointAction.Builder<A> b = new JointAction.Builder<A>(a.nagents - 1);
                for (int i = 0; i < a.nagents - 1; ++i) {
                    b.a(i, a.get(i).create());
                }
                return b.finish();
            }
        }, filterLast(a, as));
    }

    public static final <S, A extends VirtualConstructor<A>> Generator<JointAction<A>> filter(final A a,
            final int i, final Generator<JointAction<A>> as) {
        return Fn.filter(new Fn.Predicate<JointAction<A>>() {
            @Override
            public boolean apply(final JointAction<A> t) {
                return t.get(i).equals(a);
            }
        }, as);
    }

    public static final <S, A extends VirtualConstructor<A>> Generator<JointAction<A>> filterLast(final A a,
            final Generator<JointAction<A>> as) {
        return Fn.filter(new Fn.Predicate<JointAction<A>>() {
            @Override
            public boolean apply(final JointAction<A> t) {
                return t.get(t.nagents - 1).equals(a);
            }
        }, as);
    }

    public final int nagents;

    private final List<A> actions_;

    public JointAction(final A... actions) {
        this(Arrays.asList(actions));
    }

    private JointAction(final List<A> actions) {
        actions_ = actions;
        nagents = actions_.size();
    }

    public A get(final int i) {
        return actions_.get(i);
    }

    @Override
    public JointAction<A> create() {
        final List<A> copy = Fn.takeAll(Fn.map(new Fn.Function1<A, A>() {
            @Override
            public A apply(final A a) {
                return a.create();
            }
        }, actions_));
        return new JointAction<A>(copy);
    }

    @Override
    public Iterator<A> iterator() {
        return actions_.iterator();
    }

    // @Override
    public int size() {
        return actions_.size();
    }

    @Override
    public boolean equals(final Object obj) {
        //      System.out.println( "JointAction.equals()" );
        // Note: I removed the instanceof because I'm going to force a cast
        // to JointAction<A> and I'd rather throw an exception than return
        // false.
        if (obj == null) { // || !(obj instanceof JointAction<?>) ) {
            return false;
        }
        @SuppressWarnings("unchecked")
        final JointAction<A> that = (JointAction<A>) obj;
        if (size() != that.size()) {
            return false;
        }
        for (int i = 0; i < size(); ++i) {
            if (!get(i).equals(that.get(i))) {
                return false;
            }
        }
        return true;
    }

    @Override
    public int hashCode() {
        final HashCodeBuilder hb = new HashCodeBuilder(1103, 1109);
        for (final A a : this) {
            hb.append(a);
        }
        return hb.toHashCode();
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append("JointAction");
        sb.append(actions_); // List.toString() adds surrounding []
        return sb.toString();
        //      return repr_;
    }
}