package frame.expression;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import org.apache.log4j.Logger;
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import frame.util.Util;
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public class Expression implements Iterable<VariantSegment>, IVariantParseListener, IExpression {
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protected static Logger logger;
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protected List<Segment> segments;
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protected VariantList variantList;
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static {
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logger = Logger.getLogger(Expression.class);
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}
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public Expression(String String) throws Exception {
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this(String, 0);
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}
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public Expression(String String, int size) throws Exception {
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this(size);
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VariantParser parser = new VariantParser(this);
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parser.parse(String);
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}
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private Expression(int size) throws Exception {
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if (size <= 0) {
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size = 4;
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}
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segments = new ArrayList<Segment>(size);
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variantList = new VariantList();
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}
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public Expression newInstance() throws Exception {
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int size = segments.size();
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Expression instance = new Expression(size);
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Segment segment;
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VariantSegment param;
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for (int i = 0; i < size; i++) {
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segment = segments.get(i);
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if (segment instanceof VariantSegment) {
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param = (VariantSegment) segment;
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String name = param.getName();
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if (instance.variantList.contains(param.getName())) {
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instance.segments.add(instance.variantList.get(name));
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}
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else {
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segment = segment.newInstance();
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instance.segments.add(segment);
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instance.variantList.add(name, (VariantSegment) segment);
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}
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}
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else {
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segment = segment.newInstance();
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instance.segments.add(segment);
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}
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}
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return instance;
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}
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public String tryGetString() throws Exception {
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for (VariantSegment variant : variantList) {
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if (variant.isEmpty()) {
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throw new Exception("empty sql param: " + variant.getName());
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}
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}
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return getString();
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}
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public String getString() {
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StringBuilder result = new StringBuilder();
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int n = segments.size();
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Segment segment;
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String value;
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for (int i = 0; i < n; i++) {
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segment = segments.get(i);
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value = segment.getValueString();
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result.append(value);
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}
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return result.toString();
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}
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@Override
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public void onSegment(String value) {
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if (Util.isEmptyStr(value)) {
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return;
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}
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Segment segment = new StringSegment(value);
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segments.add(segment);
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}
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@Override
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public void addVariant(String name) throws Exception {
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if (Util.isEmptyStr(name)) {
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return;
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}
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if (variantList.contains(name)) {
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VariantSegment segment = variantList.get(name);
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segments.add(segment);
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}
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else {
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VariantSegment segment = new VariantSegment(name);
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segments.add(segment);
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variantList.add(name, segment);
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}
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}
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public VariantSegment getVariant(String name) {
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if (Util.isEmptyStr(name)) {
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return null;
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}
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return variantList.get(name);
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}
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public Iterator<VariantSegment> iterator() {
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return variantList.getItemList().iterator();
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}
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@Override
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public VariantList getVariantList() {
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return variantList;
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}
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public boolean isVariantEmpty() {
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return variantList.isEmpty();
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}
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public void clearVariantValues() {
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for (VariantSegment variant: variantList) {
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variant.clearValue();
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}
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}
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}
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