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PrimeFaces is one of the most popular UI libraries in Java EE Ecosystem and widely used by software companies, world renowned brands, banks, financial institutions, insurance companies, universities and more.

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/**
 * Copyright 2009-2018 PrimeTek.
 *
 * 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.primefaces.component.collector;

import java.util.Collection;

import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.faces.component.StateHolder;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ActionEvent;
import javax.faces.event.ActionListener;

public class Collector implements ActionListener, StateHolder {

    private ValueExpression addTo;
    private ValueExpression removeFrom;
    private ValueExpression value;
    private ValueExpression unique;
    private boolean _transient;

    public Collector() {
    }

    public Collector(ValueExpression addTo, ValueExpression removeFrom, ValueExpression value, ValueExpression unique) {
        this.addTo = addTo;
        this.removeFrom = removeFrom;
        this.value = value;
        this.unique = unique;
    }

    @Override
    public void processAction(ActionEvent actionEvent) throws AbortProcessingException {
        if (value == null) {
            throw new AbortProcessingException("Value has not been set");
        }

        ELContext elContext = FacesContext.getCurrentInstance().getELContext();

        Object val = (Object) value.getValue(elContext);

        if (addTo != null) {
            Collection collection = (Collection) addTo.getValue(elContext);
            Object uniqueValue = (unique != null) ? unique.getValue(elContext) : null;
            boolean checkUniqueness = (uniqueValue == null) ? true : (Boolean.valueOf(uniqueValue.toString())).booleanValue();

            if (checkUniqueness) {
                if (!collection.contains(val)) {
                    collection.add(val);
                }
            }
            else {
                collection.add(val);
            }
        }
        else if (removeFrom != null) {
            Collection collection = (Collection) removeFrom.getValue(elContext);
            collection.remove(val);
        }
        else {
            throw new IllegalArgumentException("Specify either addTo or removeFrom as collection reference");
        }
    }

    @Override
    public Object saveState(FacesContext context) {
        Object[] state = new Object[4];
        state[0] = addTo;
        state[1] = removeFrom;
        state[2] = value;
        state[3] = unique;

        return state;
    }

    @Override
    public void restoreState(FacesContext context, Object state) {
        Object[] values = (Object[]) state;
        addTo = (ValueExpression) values[0];
        removeFrom = (ValueExpression) values[1];
        value = (ValueExpression) values[2];
        unique = (ValueExpression) values[3];
    }

    @Override
    public boolean isTransient() {
        return _transient;
    }

    @Override
    public void setTransient(boolean _transient) {
        this._transient = _transient;
    }

    public ValueExpression getAddTo() {
        return addTo;
    }

    public void setAddTo(ValueExpression addTo) {
        this.addTo = addTo;
    }

    public ValueExpression getRemoveFrom() {
        return removeFrom;
    }

    public void setRemoveFrom(ValueExpression removeFrom) {
        this.removeFrom = removeFrom;
    }

    public ValueExpression getValue() {
        return value;
    }

    public void setValue(ValueExpression value) {
        this.value = value;
    }

    public ValueExpression getUnique() {
        return unique;
    }

    public void setUnique(ValueExpression unique) {
        this.unique = unique;
    }
}