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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
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 *
 * Modifications:
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 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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package com.sun.faces.facelets.tag.jstl.core;

import java.util.Collection;
import java.util.Iterator;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.PropertyNotWritableException;
import javax.el.ValueExpression;

public final class IteratedValueExpression extends ValueExpression {

    private static final long serialVersionUID = 1L;

    private ValueExpression orig;

    private int start;
    private int index;

    public IteratedValueExpression(ValueExpression orig, int start, int index) {
        this.orig = orig;
        this.start = start;
        this.index = index;
    }

    /*
     * (non-Javadoc)
     *
     * @see javax.el.ValueExpression#getValue(javax.el.ELContext)
     */
    @Override
    public Object getValue(ELContext context) {
        Collection collection = (Collection) orig.getValue(context);
        Iterator iterator = collection.iterator();
        Object result = null;
        int i = start;
        if (i != 0) {
            while(i != 0) {
                result = iterator.next();
                if (!iterator.hasNext()) {
                    throw new ELException("Unable to position start");
                }
                i--;
            }
        } else {
            result = iterator.next();
        }
        while(i < index) {
            if (!iterator.hasNext()) {
                throw new ELException("Unable to get given value");
            }
            i++;
            result = iterator.next();
        }
        return result;
    }

    /*
     * (non-Javadoc)
     *
     * @see javax.el.ValueExpression#setValue(javax.el.ELContext,
     *      java.lang.Object)
     */
    @Override
    public void setValue(ELContext context, Object value) {
        context.setPropertyResolved(false);
        throw new PropertyNotWritableException();
    }

    /*
     * (non-Javadoc)
     *
     * @see javax.el.ValueExpression#isReadOnly(javax.el.ELContext)
     */
    @Override
    public boolean isReadOnly(ELContext context) {
        context.setPropertyResolved(false);
        return true;
    }

    /*
     * (non-Javadoc)
     *
     * @see javax.el.ValueExpression#getType(javax.el.ELContext)
     */
    @Override
    public Class getType(ELContext context) {
        context.setPropertyResolved(false);
        return Object.class;
    }

    /*
     * (non-Javadoc)
     *
     * @see javax.el.ValueExpression#getExpectedType()
     */
    @Override
    public Class getExpectedType() {
        return Object.class;
    }

    /*
     * (non-Javadoc)
     *
     * @see javax.el.Expression#getExpressionString()
     */
    @Override
    public String getExpressionString() {
        return this.orig.getExpressionString();
    }

    /*
     * (non-Javadoc)
     *
     * @see javax.el.Expression#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj) {
        return this.orig.equals(obj);
    }

    /*
     * (non-Javadoc)
     *
     * @see javax.el.Expression#hashCode()
     */
    @Override
    public int hashCode() {
        return this.orig.hashCode();
    }

    /*
     * (non-Javadoc)
     *
     * @see javax.el.Expression#isLiteralText()
     */
    @Override
    public boolean isLiteralText() {
        return false;
    }

}