public void execute()

in src/main/org/apache/tools/ant/taskdefs/Property.java [501:578]
69 lines of code
29 McCabe index (conditional complexity)

    public void execute() throws BuildException {
        if (getProject() == null) {
            throw new IllegalStateException("project has not been set");
        }

        if (name != null) {
            if (untypedValue == null && ref == null) {
                throw new BuildException(
                    "You must specify value, location or refid with the name attribute",
                    getLocation());
            }
        } else {
            if (url == null && file == null && resource == null
                && env == null && runtime == null) {
                throw new BuildException(
                    "You must specify url, file, resource, environment or runtime when not using the name attribute",
                    getLocation());
            }
        }

        if (url == null && file == null && resource == null && prefix != null) {
            throw new BuildException(
                "Prefix is only valid when loading from a url, file or resource",
                getLocation());
        }

        if (name != null && untypedValue != null) {
            if (relative) {
                try {
                    File from =
                        untypedValue instanceof File ? (File) untypedValue
                            : new File(untypedValue.toString());
                    File to = basedir != null ? basedir : getProject().getBaseDir();
                    String relPath = FileUtils.getRelativePath(to, from);
                    relPath = relPath.replace('/', File.separatorChar);
                    addProperty(name, relPath);
                } catch (Exception e) {
                    throw new BuildException(e, getLocation());
                }
            } else {
                addProperty(name, untypedValue);
            }
        }

        if (file != null) {
            loadFile(file);
        }

        if (url != null) {
            loadUrl(url);
        }

        if (resource != null) {
            loadResource(resource);
        }

        if (env != null) {
            loadEnvironment(env);
        }

        if (runtime != null) {
            loadRuntime(runtime);
        }

        if (name != null && ref != null) {
            try {
                addProperty(name,
                            ref.getReferencedObject(getProject()).toString());
            } catch (BuildException be) {
                if (fallback != null) {
                    addProperty(name,
                                ref.getReferencedObject(fallback).toString());
                } else {
                    throw be;
                }
            }
        }
    }