Example usage for org.eclipse.jdt.core JavaCore COMPUTE

Introduction

In this page you can find the example usage for org.eclipse.jdt.core JavaCore COMPUTE.

Prototype

String COMPUTE

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Document

Configurable option value: .

Usage

From source file:org.eclipse.jdt.internal.core.JavaModelManager.java

License:Open Source License

/**
 * Record the order in which to build the java projects (batch build). This order is based
 * on the projects classpath settings.//from   w  ww  .  j  ava 2  s.com
 */
protected void setBuildOrder(String[] javaBuildOrder) throws JavaModelException {

    // optional behaviour
    // possible value of index 0 is Compute
    if (!JavaCore.COMPUTE.equals(JavaCore.getOption(JavaCore.CORE_JAVA_BUILD_ORDER)))
        return; // cannot be customized at project level

    if (javaBuildOrder == null || javaBuildOrder.length <= 1)
        return;

    IWorkspace workspace = ResourcesPlugin.getWorkspace();
    IWorkspaceDescription description = workspace.getDescription();
    String[] wksBuildOrder = description.getBuildOrder();

    String[] newOrder;
    if (wksBuildOrder == null) {
        newOrder = javaBuildOrder;
    } else {
        // remove projects which are already mentionned in java builder order
        int javaCount = javaBuildOrder.length;
        HashMap newSet = new HashMap(javaCount); // create a set for fast check
        for (int i = 0; i < javaCount; i++) {
            newSet.put(javaBuildOrder[i], javaBuildOrder[i]);
        }
        int removed = 0;
        int oldCount = wksBuildOrder.length;
        for (int i = 0; i < oldCount; i++) {
            if (newSet.containsKey(wksBuildOrder[i])) {
                wksBuildOrder[i] = null;
                removed++;
            }
        }
        // add Java ones first
        newOrder = new String[oldCount - removed + javaCount];
        System.arraycopy(javaBuildOrder, 0, newOrder, 0, javaCount); // java projects are built first

        // copy previous items in their respective order
        int index = javaCount;
        for (int i = 0; i < oldCount; i++) {
            if (wksBuildOrder[i] != null) {
                newOrder[index++] = wksBuildOrder[i];
            }
        }
    }
    // commit the new build order out
    description.setBuildOrder(newOrder);
    try {
        workspace.setDescription(description);
    } catch (CoreException e) {
        throw new JavaModelException(e);
    }
}

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