Application: gvSIG desktop

import java.util.zip.CRC32;

    public void setDefaultTimeAttributeName(String name) {

        if (name == null || name.length() == 0) {

            this.defaultTimeAttributeIndex = -1;

            return;

        }

        DefaultFeatureAttributeDescriptor attr = (DefaultFeatureAttributeDescriptor) this.get(name);

        if (attr == null) {

            throw new IllegalArgumentException("Attribute '" + name + "' not found.");

        }

        if( attr.getIndex()<0 ) {

            fixAll();

        }

        this.defaultTimeAttributeIndex = attr.getIndex();

    }

    protected void fixAll() {

        int i = 0;

        Iterator iter = super.iterator();

        DefaultFeatureAttributeDescriptor attr;

        while (iter.hasNext()) {

            attr = (DefaultFeatureAttributeDescriptor) iter.next();

            attr.setIndex(i++);

            if (attr instanceof DefaultEditableFeatureAttributeDescriptor) {

                ((DefaultEditableFeatureAttributeDescriptor) attr).fixAll();

            }

            if (attr.getEvaluator() != null) {

                this.hasEvaluators = true;

            }

            if (attr.getFeatureAttributeEmulator() != null) {

                this.hasEmulators = true;

            }

            if (this.defaultGeometryAttributeName == null && attr.getType() == DataTypes.GEOMETRY) {

                this.defaultGeometryAttributeName = attr.getName();

            }

        }

        if (this.defaultGeometryAttributeName != null) {

            this.defaultGeometryAttributeIndex = this.getIndex(this.defaultGeometryAttributeName);

        }

        this.internalID = Long.toHexString(this.getCRC());

    }

    protected long getCRC() {

        StringBuffer buffer = new StringBuffer();

        for (int i = 0; i < this.size(); i++) {

            FeatureAttributeDescriptor x = this.getAttributeDescriptor(i);

            buffer.append(x.getName());

            buffer.append(x.getDataTypeName());

            buffer.append(x.getSize());

        }

        CRC32 crc = new CRC32();

        byte[] data = buffer.toString().getBytes();

        crc.update(data);

        return crc.getValue();

    }