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Java example source code file (DynSequenceImpl.java)

This example Java source code file (DynSequenceImpl.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

any, bad_operation, corba, dynany, dynanycollectionimpl, dynanyimpl, dynsequenceimpl, inconsistenttypecode, inputstream, invalidvalue, no_index, outputstream, status_destroyed, typecode

The DynSequenceImpl.java Java example source code

/*
 * Copyright (c) 2000, 2003, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.corba.se.impl.dynamicany;

import org.omg.CORBA.TypeCode;
import org.omg.CORBA.Any;
import org.omg.CORBA.BAD_OPERATION;
import org.omg.CORBA.TypeCodePackage.BadKind;
import org.omg.CORBA.TypeCodePackage.Bounds;
import org.omg.CORBA.portable.InputStream;
import org.omg.CORBA.portable.OutputStream;
import org.omg.DynamicAny.*;
import org.omg.DynamicAny.DynAnyPackage.TypeMismatch;
import org.omg.DynamicAny.DynAnyPackage.InvalidValue;
import org.omg.DynamicAny.DynAnyFactoryPackage.InconsistentTypeCode;

import com.sun.corba.se.spi.orb.ORB ;
import com.sun.corba.se.spi.logging.CORBALogDomains ;
import com.sun.corba.se.impl.logging.ORBUtilSystemException ;

// _REVIST_ Could make this a subclass of DynArrayImpl
// But that would mean that an object that implements DynSequence also implements DynArray
// which the spec doesn't mention (it also doesn't forbid it).
public class DynSequenceImpl extends DynAnyCollectionImpl implements DynSequence
{
    //
    // Constructors
    //

    private DynSequenceImpl() {
        this(null, (Any)null, false);
    }

    protected DynSequenceImpl(ORB orb, Any any, boolean copyValue) {
        super(orb, any, copyValue);
    }

    // Sets the current position to -1 and creates an empty sequence.
    protected DynSequenceImpl(ORB orb, TypeCode typeCode) {
        super(orb, typeCode);
    }

    // Initializes components and anys representation
    // from the Any representation
    protected boolean initializeComponentsFromAny() {
        // This typeCode is of kind tk_sequence.
        TypeCode typeCode = any.type();
        int length;
        TypeCode contentType = getContentType();
        InputStream input;

        try {
            input = any.create_input_stream();
        } catch (BAD_OPERATION e) {
            return false;
        }

        length = input.read_long();
        components = new DynAny[length];
        anys = new Any[length];

        for (int i=0; i<length; i++) {
            // _REVISIT_ Could use read_xxx_array() methods on InputStream for efficiency
            // but only for primitive types
            anys[i] = DynAnyUtil.extractAnyFromStream(contentType, input, orb);
            try {
                // Creates the appropriate subtype without copying the Any
                components[i] = DynAnyUtil.createMostDerivedDynAny(anys[i], orb, false);
            } catch (InconsistentTypeCode itc) { // impossible
            }
        }
        return true;
    }

    // Sets the current position to -1 and creates an empty sequence.
    protected boolean initializeComponentsFromTypeCode() {
        // already done in the type code constructor
        components = new DynAny[0];
        anys = new Any[0];
        return true;
    }

    // Collapses the whole DynAny hierarchys values into one single streamed Any
    protected boolean initializeAnyFromComponents() {
        OutputStream out = any.create_output_stream();
        // Writing the length first is the only difference to supers implementation
        out.write_long(components.length);
        for (int i=0; i<components.length; i++) {
            if (components[i] instanceof DynAnyImpl) {
                ((DynAnyImpl)components[i]).writeAny(out);
            } else {
                // Not our implementation. Nothing we can do to prevent copying.
                components[i].to_any().write_value(out);
            }
        }
        any.read_value(out.create_input_stream(), any.type());
        return true;
    }


    //
    // DynSequence interface methods
    //

    // Returns the current length of the sequence
    public int get_length() {
        if (status == STATUS_DESTROYED) {
            throw wrapper.dynAnyDestroyed() ;
        }
        return (checkInitComponents() ? components.length : 0);
    }

    // Sets the length of the sequence. Increasing the length of a sequence
    // adds new elements at the tail without affecting the values of already
    // existing elements. Newly added elements are default-initialized.
    //
    // Increasing the length of a sequence sets the current position to the first
    // newly-added element if the previous current position was -1.
    // Otherwise, if the previous current position was not -1,
    // the current position is not affected.
    //
    // Increasing the length of a bounded sequence to a value larger than the bound
    // raises InvalidValue.
    //
    // Decreasing the length of a sequence removes elements from the tail
    // without affecting the value of those elements that remain.
    // The new current position after decreasing the length of a sequence is determined
    // as follows:
    // ?f the length of the sequence is set to zero, the current position is set to -1.
    // ?f the current position is -1 before decreasing the length, it remains at -1.
    // ?f the current position indicates a valid element and that element is not removed
    // when the length is decreased, the current position remains unaffected.
    // ?f the current position indicates a valid element and that element is removed, the
    // current position is set to -1.
    public void set_length(int len)
        throws org.omg.DynamicAny.DynAnyPackage.InvalidValue
    {
        if (status == STATUS_DESTROYED) {
            throw wrapper.dynAnyDestroyed() ;
        }
        int bound = getBound();
        if (bound > 0 && len > bound) {
            throw new InvalidValue();
        }

        checkInitComponents();

        int oldLength = components.length;
        if (len > oldLength) {
            // Increase length
            DynAny[] newComponents = new DynAny[len];
            Any[] newAnys = new Any[len];
            System.arraycopy(components, 0, newComponents, 0, oldLength);
            System.arraycopy(anys, 0, newAnys, 0, oldLength);
            components = newComponents;
            anys = newAnys;

            // Newly added elements are default-initialized
            TypeCode contentType = getContentType();
            for (int i=oldLength; i<len; i++) {
                createDefaultComponentAt(i, contentType);
            }

            // Increasing the length of a sequence sets the current position to the first
            // newly-added element if the previous current position was -1.
            if (index == NO_INDEX)
                index = oldLength;
        } else if (len < oldLength) {
            // Decrease length
            DynAny[] newComponents = new DynAny[len];
            Any[] newAnys = new Any[len];
            System.arraycopy(components, 0, newComponents, 0, len);
            System.arraycopy(anys, 0, newAnys, 0, len);
            // It is probably right not to destroy the released component DynAnys.
            // Some other DynAny or a user variable might still hold onto them
            // and if not then the garbage collector will take care of it.
            //for (int i=len; i<oldLength; i++) {
            //    components[i].destroy();
            //}
            components = newComponents;
            anys = newAnys;

            // ?f the length of the sequence is set to zero, the current position is set to -1.
            // ?f the current position is -1 before decreasing the length, it remains at -1.
            // ?f the current position indicates a valid element and that element is not removed
            // when the length is decreased, the current position remains unaffected.
            // ?f the current position indicates a valid element and that element is removed,
            // the current position is set to -1.
            if (len == 0 || index >= len) {
                index = NO_INDEX;
            }
        } else {
            // Length unchanged
            // Maybe components is now default initialized from type code
            if (index == NO_INDEX && len > 0) {
                index = 0;
            }
        }
    }

    // Initializes the elements of the sequence.
    // The length of the DynSequence is set to the length of value.
    // The current position is set to zero if value has non-zero length
    // and to -1 if value is a zero-length sequence.
    // If the length of value exceeds the bound of a bounded sequence,
    // the operation raises InvalidValue.
    // If value contains one or more elements whose TypeCode is not equivalent
    // to the element TypeCode of the DynSequence, the operation raises TypeMismatch.
/*
    public void set_elements(org.omg.CORBA.Any[] value)
        throws org.omg.DynamicAny.DynAnyPackage.TypeMismatch,
               org.omg.DynamicAny.DynAnyPackage.InvalidValue;
*/

    //
    // Utility methods
    //

    protected void checkValue(Object[] value)
        throws org.omg.DynamicAny.DynAnyPackage.InvalidValue
    {
        if (value == null || value.length == 0) {
            clearData();
            index = NO_INDEX;
            return;
        } else {
            index = 0;
        }
        int bound = getBound();
        if (bound > 0 && value.length > bound) {
            throw new InvalidValue();
        }
    }
}

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