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/*
 * Copyright 2004-2013 ICEsoft Technologies Canada Corp.
 *
 * 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 org.icefaces.ace.util.collections;

import org.icefaces.ace.model.filter.FilterConstraint;

import javax.el.ELResolver;
import javax.el.ValueExpression;
import javax.faces.context.FacesContext;
import java.text.DateFormat;
import java.util.Date;

public class PropertyConstraintPredicate implements Predicate {
    ValueExpression filterBy;
    String filterValue;
    FilterConstraint filterConstraint;
    FacesContext facesContext;

    public PropertyConstraintPredicate(FacesContext context, ValueExpression filterBy, String filterValue, FilterConstraint constraint) {
        this.filterValue = filterValue;
        this.filterConstraint = constraint;
        this.facesContext = context;
        this.filterBy = filterBy;
    }

    public boolean evaluate(Object object) {
        Object value = filterBy.getValue(facesContext.getELContext());

        if (value instanceof Date)
            value = DateFormat.getDateInstance().format(value);

        if (value != null)
            return filterConstraint.applies(value.toString(), filterValue);
        else if (filterValue != null && filterValue.length() > 0)
            return false;
        else
            return true;
    }
}