OpenConcerto

Dépôt officiel du code source de l'ERP OpenConcerto
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svn://code.openconcerto.org/openconcerto

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17 ilm 1 
/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 *
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 * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.
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 *
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 * The contents of this file are subject to the terms of the GNU General Public License Version 3
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 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a
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 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific
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 * language governing permissions and limitations under the License.
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 *
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 * When distributing the software, include this License Header Notice in each file.
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 */
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 package org.openconcerto.utils.cc;
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import org.apache.commons.collections.Predicate;
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public abstract class IPredicate<E> implements Predicate {
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    private static final IPredicate<Object> truePred = new IPredicate<Object>() {
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        @Override
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        public boolean evaluateChecked(Object input) {
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            return true;
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        }
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    };
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    private static final IPredicate<Object> falsePred = new IPredicate<Object>() {
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        @Override
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        public boolean evaluateChecked(Object input) {
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            return false;
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        }
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    };
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    private static final IPredicate<Object> NotNullPred = new IPredicate<Object>() {
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        @Override
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        public boolean evaluateChecked(Object input) {
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            return input != null;
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        }
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    };
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    @SuppressWarnings("unchecked")
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    public static final <N> IPredicate<N> truePredicate() {
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        return (IPredicate<N>) truePred;
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    }
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    @SuppressWarnings("unchecked")
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    public static final <N> IPredicate<N> falsePredicate() {
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        return (IPredicate<N>) falsePred;
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    }
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    @SuppressWarnings("unchecked")
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    public static final <N> IPredicate<N> notNullPredicate() {
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        return (IPredicate<N>) NotNullPred;
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    }
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    @SuppressWarnings("unchecked")
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    @Override
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    public boolean evaluate(Object object) {
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        return this.evaluateChecked((E) object);
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    }
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    public abstract boolean evaluateChecked(E input);
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    public final <F extends E> IPredicate<F> cast() {
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        // this class never returns E, only takes it as argument
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        // but we cannot return this instance :
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        // class Sub<E> extends IPredicate<E> {
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        // E someMethod();
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        // }
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        // Sub<Number> n;
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        // IPredicate<Integer> cast = n.<Integer> cast();
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        // Sub<Integer> n2 = (Sub<Integer>) cast;
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        // the cast in the line above will succeed but n2.someMethod()
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        // will fail if n.someMethod() returns a BigDecimal
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        // since we're returning a new IPredicate instance, the n2 line would correctly fail
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        return new IPredicate<F>() {
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            @Override
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            public boolean evaluateChecked(F input) {
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                return IPredicate.this.evaluateChecked(input);
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            }
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        };
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    }
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    public final IPredicate<E> not() {
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        if (this == truePred)
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            return falsePredicate();
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        else if (this == falsePred)
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            return truePredicate();
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        else
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            return new IPredicate<E>() {
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                @Override
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                public boolean evaluateChecked(E input) {
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                    return !IPredicate.this.evaluateChecked(input);
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                }
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            };
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    }
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    public final IPredicate<E> and(final IPredicate<? super E> o) {
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        if (o == this || o == truePred)
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            return this;
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        else if (this == truePred)
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            return o.cast();
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        else if (o == falsePred || this == falsePred)
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            return falsePredicate();
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        else
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            return new IPredicate<E>() {
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                @Override
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                public boolean evaluateChecked(E input) {
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                    return IPredicate.this.evaluateChecked(input) && o.evaluateChecked(input);
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                }
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            };
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    }
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    public final IPredicate<E> or(final IPredicate<? super E> o) {
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        if (o == this || o == falsePred)
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            return this;
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        else if (this == falsePred)
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            return o.cast();
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        else if (o == truePred || this == truePred)
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            return truePredicate();
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        else
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            return new IPredicate<E>() {
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                @Override
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                public boolean evaluateChecked(E input) {
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                    return IPredicate.this.evaluateChecked(input) || o.evaluateChecked(input);
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                }
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            };
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    }
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}