org.eclipse.jdt.internal.core.OpenableElementInfo.java Source code

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Here is the source code for org.eclipse.jdt.internal.core.OpenableElementInfo.java

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/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Vladimir Piskarev <pisv@1c.ru> - Thread safety of OpenableElementInfo - https://bugs.eclipse.org/450490
 *******************************************************************************/
package org.eclipse.jdt.internal.core;

import java.util.Arrays;

import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IModuleDescription;

/** Element info for IOpenable elements. */
public class OpenableElementInfo extends JavaElementInfo {

    /**
     * Collection of handles of immediate children of this
     * object. This is an empty array if this element has
     * no children.
     */
    protected volatile IJavaElement[] children = JavaElement.NO_ELEMENTS;
    protected IModuleDescription module;
    /**
     * Is the structure of this element known
     * @see IJavaElement#isStructureKnown()
     */
    protected boolean isStructureKnown = false;

    /**
     * A array with all the non-java resources contained by this element
     */
    protected Object[] nonJavaResources;

    public void addChild(IJavaElement child) {
        IJavaElement[] oldChildren = this.children;
        int length = oldChildren.length;
        if (length == 0) {
            this.children = new IJavaElement[] { child };
        } else {
            for (int i = 0; i < length; i++) {
                if (oldChildren[i].equals(child))
                    return; // already included
            }
            IJavaElement[] newChildren = new IJavaElement[length + 1];
            System.arraycopy(oldChildren, 0, newChildren, 0, length);
            newChildren[length] = child;
            this.children = newChildren;
        }
    }

    @Override
    public IJavaElement[] getChildren() {
        return this.children;
    }

    /**
     * @see IJavaElement#isStructureKnown()
     */
    public boolean isStructureKnown() {
        return this.isStructureKnown;
    }

    public void removeChild(IJavaElement child) {
        IJavaElement[] oldChildren = this.children;
        for (int i = 0, length = oldChildren.length; i < length; i++) {
            if (oldChildren[i].equals(child)) {
                if (length == 1) {
                    this.children = JavaElement.NO_ELEMENTS;
                } else {
                    IJavaElement[] newChildren = new IJavaElement[length - 1];
                    System.arraycopy(oldChildren, 0, newChildren, 0, i);
                    if (i < length - 1)
                        System.arraycopy(oldChildren, i + 1, newChildren, i, length - 1 - i);
                    this.children = newChildren;
                }
                break;
            }
        }
    }

    public void setChildren(IJavaElement[] children) {
        this.children = (children.length > 0) ? children : JavaElement.NO_ELEMENTS;
    }

    public void setModule(IModuleDescription module) {
        this.module = module;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(getClass().getSimpleName());
        sb.append(" ["); //$NON-NLS-1$
        sb.append("isStructureKnown="); //$NON-NLS-1$
        sb.append(this.isStructureKnown);
        sb.append(", "); //$NON-NLS-1$
        if (this.module != null) {
            sb.append("module="); //$NON-NLS-1$
            sb.append(this.module);
            sb.append(", "); //$NON-NLS-1$
        }
        if (this.children != null) {
            sb.append("children="); //$NON-NLS-1$
            sb.append(Arrays.toString(this.children));
            sb.append(", "); //$NON-NLS-1$
        }
        if (this.nonJavaResources != null) {
            sb.append("nonJavaResources="); //$NON-NLS-1$
            sb.append(Arrays.toString(this.nonJavaResources));
        }
        sb.append("]"); //$NON-NLS-1$
        return sb.toString();
    }

    public IModuleDescription getModule() {
        return this.module;
    }

    /**
     * Sets whether the structure of this element known
     * @see IJavaElement#isStructureKnown()
     */
    public void setIsStructureKnown(boolean newIsStructureKnown) {
        this.isStructureKnown = newIsStructureKnown;
    }

    /**
     * Sets the nonJavaResources
     */
    void setNonJavaResources(Object[] resources) {
        this.nonJavaResources = resources;
    }
}