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 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package com.sun.jdi;

import java.util.List;

/**
 * Provides access to an array object and its components in the target VM.
 * Each array component is mirrored by a {@link Value} object.
 * The array components, in aggregate, are placed in {@link java.util.List}
 * objects instead of arrays for consistency with the rest of the API and
 * for interoperability with other APIs.
 *
 * @author Robert Field
 * @author Gordon Hirsch
 * @author James McIlree
 * @since  1.3
 */
public interface ArrayReference extends ObjectReference {

    /**
     * Returns the number of components in this array.
     *
     * @return the integer count of components in this array.
     */
    int length();

    /**
     * Returns an array component value.
     *
     * @param index the index of the component to retrieve
     * @return the {@link Value} at the given index.
     * @throws java.lang.IndexOutOfBoundsException if
     * <CODE><I>index</I></CODE> is outside the range of this array,
     * that is, if either of the following are true:
     * <PRE>
     *    <I>index</I> &lt; 0
     *    <I>index</I> &gt;= {@link #length() length()} </PRE>
     */
    Value getValue(int index);

    /**
     * Returns all of the components in this array.
     *
     * @return a list of {@link Value} objects, one for each array
     * component ordered by array index.  For zero length arrays,
     * an empty list is returned.
     */
    List<Value> getValues();

    /**
     * Returns a range of array components.
     *
     * @param index the index of the first component to retrieve
     * @param length the number of components to retrieve, or -1 to
     * retrieve all components to the end of this array.
     * @return a list of {@link Value} objects, one for each requested
     * array component ordered by array index.  When there are
     * no elements in the specified range (e.g.
     * <CODE><I>length</I></CODE> is zero) an empty list is returned
     *
     * @throws java.lang.IndexOutOfBoundsException if the range
     * specified with <CODE><I>index</I></CODE> and
     * <CODE><I>length</I></CODE> is not within the range of the array,
     * that is, if either of the following are true:
     * <PRE>
     *    <I>index</I> &lt; 0
     *    <I>index</I> &gt; {@link #length() length()} </PRE>
     * or if <CODE><I>length</I> != -1</CODE> and
     * either of the following are true:
     * <PRE>
     *    <I>length</I> &lt; 0
     *    <I>index</I> + <I>length</I> &gt;  {@link #length() length()}</PRE>
     */
    List<Value> getValues(int index, int length);

    /**
     * Replaces an array component with another value.
     * <p>
     * Object values must be assignment compatible with the component type
     * (This implies that the component type must be loaded through the
     * declaring class's class loader). Primitive values must be
     * either assignment compatible with the component type or must be
     * convertible to the component type without loss of information.
     * See JLS section 5.2 for more information on assignment
     * compatibility.
     *
     * @param value the new value
     * @param index the index of the component to set
     * @throws java.lang.IndexOutOfBoundsException if
     * <CODE><I>index</I></CODE> is outside the range of this array,
     * that is, if either of the following are true:
     * <PRE>
     *    <I>index</I> &lt; 0
     *    <I>index</I> &gt;= {@link #length() length()} </PRE>
     * @throws InvalidTypeException if the type of <CODE><I>value</I></CODE>
     * is not compatible with the declared type of array components.
     * @throws ClassNotLoadedException if the array component type
     * has not yet been loaded
     * through the appropriate class loader.
     * @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
     *
     * @see ArrayType#componentType()
     */
    void setValue(int index, Value value)
            throws InvalidTypeException,
                   ClassNotLoadedException;

    /**
     * Replaces all array components with other values. If the given
     * list is larger in size than the array, the values at the
     * end of the list are ignored.
     * <p>
     * Object values must be assignment compatible with the element type
     * (This implies that the component type must be loaded through the
     * enclosing class's class loader). Primitive values must be
     * either assignment compatible with the component type or must be
     * convertible to the component type without loss of information.
     * See JLS section 5.2 for more information on assignment
     * compatibility.
     *
     * @param values a list of {@link Value} objects to be placed
     * in this array.  If <CODE><I>values</I>.size()</CODE> is
     * less that the length of the array, the first
     * <CODE><I>values</I>.size()</CODE> elements are set.
     * @throws InvalidTypeException if any of the
     * new <CODE><I>values</I></CODE>
     * is not compatible with the declared type of array components.
     * @throws ClassNotLoadedException if the array component
     * type has not yet been loaded
     * through the appropriate class loader.
     * @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
     *
     * @see ArrayType#componentType()
     */
    void setValues(List<? extends Value> values)
            throws InvalidTypeException,
                   ClassNotLoadedException;

    /**
     * Replaces a range of array components with other values.
     * <p>
     * Object values must be assignment compatible with the component type
     * (This implies that the component type must be loaded through the
     * enclosing class's class loader). Primitive values must be
     * either assignment compatible with the component type or must be
     * convertible to the component type without loss of information.
     * See JLS section 5.2 for more information on assignment
     * compatibility.
     *
     * @param index the index of the first component to set.
     * @param values a list of {@link Value} objects to be placed
     * in this array.
     * @param srcIndex the index of the first source value to use.
     * @param length the number of components to set, or -1 to set
     * all components to the end of this array or the end of
     * <CODE><I>values</I></CODE> (whichever comes first).
     * @throws InvalidTypeException if any element of
     * <CODE><I>values</I></CODE>
     * is not compatible with the declared type of array components.
     * @throws java.lang.IndexOutOfBoundsException if the
     * array range specified with
     * <CODE><I>index</I></CODE> and  <CODE><I>length</I></CODE>
     * is not within the range of the array,
     * or if the source range specified with
     * <CODE><I>srcIndex</I></CODE> and <CODE><I>length</I></CODE>
     * is not within <CODE><I>values</I></CODE>,
     * that is, if any of the following are true:
     * <PRE>
     *    <I>index</I> &lt; 0
     *    <I>index</I> &gt; {@link #length() length()}
     *    <I>srcIndex</I> &lt; 0
     *    <I>srcIndex</I> &gt; <I>values</I>.size() </PRE>
     * or if <CODE><I>length</I> != -1</CODE> and any of the
     * following are true:
     * <PRE>
     *    <I>length</I> &lt; 0
     *    <I>index</I> + <I>length</I> &gt; {@link #length() length()}
     *    <I>srcIndex</I> + <I>length</I> &gt; <I>values</I>.size() </PRE>
     * @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
     * @see ArrayType#componentType()
     */
    void setValues(int index, List<? extends Value> values, int srcIndex, int length)
            throws InvalidTypeException,
                   ClassNotLoadedException;
}