com.livinglogic.ul4.FunctionAsJSON.java Source code

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Here is the source code for com.livinglogic.ul4.FunctionAsJSON.java

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/*
** Copyright 2009-2014 by LivingLogic AG, Bayreuth/Germany
** All Rights Reserved
** See LICENSE for the license
*/

package com.livinglogic.ul4;

import java.util.List;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Map;
import java.util.Set;

import org.apache.commons.lang.StringEscapeUtils;

public class FunctionAsJSON extends Function {
    public String nameUL4() {
        return "asjson";
    }

    private static final Signature signature = new Signature("obj", Signature.required);

    public Signature getSignature() {
        return signature;
    }

    public Object evaluate(BoundArguments args) {
        return call(args.get(0));
    }

    private static void call(StringBuilder builder, Object obj) {
        if (obj == null)
            builder.append("null");
        else if (obj instanceof Boolean)
            builder.append(((Boolean) obj).booleanValue() ? "true" : "false");
        else if (obj instanceof Integer || obj instanceof Byte || obj instanceof Short || obj instanceof Long
                || obj instanceof BigInteger || obj instanceof Double || obj instanceof Float)
            builder.append(obj.toString());
        else if (obj instanceof BigDecimal) {
            String result = obj.toString();
            builder.append(result);
            if (result.indexOf('.') < 0 || result.indexOf('E') < 0 || result.indexOf('e') < 0)
                builder.append(".0");
        } else if (obj instanceof String)
            builder.append("\"")
                    // We're using StringEscapeUtils.escapeJava() here, which is the same as escapeJavaScript, except that it doesn't escape ' (which is illegal in JSON strings according to json.org)
                    .append(StringEscapeUtils.escapeJava(((String) obj))).append("\"");
        else if (obj instanceof Date) {
            Calendar calendar = new GregorianCalendar();
            calendar.setTime((Date) obj);
            builder.append("new Date(").append(calendar.get(Calendar.YEAR)).append(", ")
                    .append(calendar.get(Calendar.MONTH)).append(", ").append(calendar.get(Calendar.DAY_OF_MONTH))
                    .append(", ").append(calendar.get(Calendar.HOUR_OF_DAY)).append(", ")
                    .append(calendar.get(Calendar.MINUTE)).append(", ").append(calendar.get(Calendar.SECOND));
            int milliSeconds = calendar.get(Calendar.MILLISECOND);
            if (milliSeconds != 0) {
                builder.append(", ").append(milliSeconds);
            }
            builder.append(")");
        } else if (obj instanceof InterpretedTemplate) {
            builder.append("ul4.Template.loads(\"")
                    .append(StringEscapeUtils.escapeJavaScript(((InterpretedTemplate) obj).dumps())).append("\")");
        } else if (obj instanceof TemplateClosure) {
            builder.append("ul4.Template.loads(\"")
                    .append(StringEscapeUtils.escapeJavaScript(((TemplateClosure) obj).getTemplate().dumps()))
                    .append("\")");
        } else if (obj instanceof UL4Attributes) {
            builder.append("{");
            boolean first = true;
            Set<String> attributeNames = ((UL4Attributes) obj).getAttributeNamesUL4();
            for (String attributeName : attributeNames) {
                if (first)
                    first = false;
                else
                    builder.append(", ");
                call(builder, attributeName);
                builder.append(": ");
                Object value = ((UL4Attributes) obj).getItemStringUL4(attributeName);
                call(builder, value);
            }
            builder.append("}");
        } else if (obj instanceof Color) {
            Color c = (Color) obj;
            builder.append("ul4.Color.create(").append(c.getR()).append(", ").append(c.getG()).append(", ")
                    .append(c.getB()).append(", ").append(c.getA()).append(")");
        } else if (obj instanceof Collection) {
            builder.append("[");
            boolean first = true;
            for (Object o : (Collection) obj) {
                if (first)
                    first = false;
                else
                    builder.append(", ");
                call(builder, o);
            }
            builder.append("]");
        } else if (obj instanceof Object[]) {
            builder.append("[");
            boolean first = true;
            for (Object o : (Object[]) obj) {
                if (first)
                    first = false;
                else
                    builder.append(", ");
                call(builder, o);
            }
            builder.append("]");
        } else if (obj instanceof Map) {
            builder.append("{");
            boolean first = true;
            Set<Map.Entry> entrySet = ((Map) obj).entrySet();
            for (Map.Entry entry : entrySet) {
                if (first)
                    first = false;
                else
                    builder.append(", ");
                call(builder, entry.getKey());
                builder.append(": ");
                call(builder, entry.getValue());
            }
            builder.append("}");
        }
    }

    public static String call(Object obj) {
        StringBuilder builder = new StringBuilder();
        call(builder, obj);
        return builder.toString();
    }
}