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JSimpleDB classes for parsing Java expressions.

There is a newer version: 3.6.1


/*
 * Copyright (C) 2015 Archie L. Cobbs. All rights reserved.
 */

package org.jsimpledb.parse;

import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;

import java.util.regex.Matcher;

import org.dellroad.stuff.java.EnumUtil;
import org.jsimpledb.util.ParseContext;

public class EnumNameParser> implements Parser {

    private final Class type;
    private final boolean lowerCase;
    private final Function nameFunction = new Function() {
        @Override
        public String apply(T value) {
            String name = value.name();
            if (EnumNameParser.this.lowerCase)
                name = name.toLowerCase();
            return name;
        }
    };

    public EnumNameParser(Class type) {
        this(type, true);
    }

    public EnumNameParser(Class type, boolean lowerCase) {
        Preconditions.checkArgument(type != null, "null type");
        this.type = type;
        this.lowerCase = lowerCase;
    }

    @Override
    public T parse(ParseSession session, ParseContext ctx, boolean complete) {

        // Get name
        final Matcher matcher = ctx.tryPattern("[^\\s;]*");
        if (matcher == null && ctx.isEOF())
            throw new ParseException(ctx).addCompletions(Lists.transform(EnumUtil.getValues(this.type), this.nameFunction));
        final String name = matcher.group();

        // Match name
        for (T value : EnumUtil.getValues(this.type)) {
            final String valueName = this.nameFunction.apply(value);
            if (name.equals(valueName))
                return value;
        }

        // Not found
        throw new ParseException(ctx, "unknown value `" + name + "'").addCompletions(
            ParseUtil.complete(Lists.transform(EnumUtil.getValues(this.type), this.nameFunction), name));
    }
}